Audio manuals and audio service pdf instructions. Find the user manual you need for your audio device and more at ManualsOnline. Polk Audio Speaker System RT15 User Guide ManualsOnline.com. View & download of more than 1673 Mcculloch PDF user manuals, service manuals, operating guides. Lawn mower user manuals, operating guides & specifications.
AT-8500 Series to the manual 698301a0-c2a0-4894-fdba-16f1fe274bac
: Allied-Telesis Allied-Telesis-At-8500-Series-Users-Manual-414394 allied-telesis-at-8500-series-users-manual-414394 allied-telesis pdf
Open the PDF directly: View PDF .
Page Count: 90
- Preface
- Contacting Allied Telesis
- Overview
- Model Descriptions
- Port Descriptions
- 10/100Base-TX Twisted Pair Ports
- 10/100/ 1000BaseT Twisted Pair Ports
- 100Base-FX Fiber Optic Ports
- Power Over Ethernet
- LEDs
- Power Options and Connectors
- A Few Basics about Ethernet Switching
- Network Topologies
- Installation
- Unpacking the Switch
- Installing the Switch in a Rack
- Installing an Optional Expansion or Stacking Module
- Installing an Optional GBIC
- Installing an Optional SFP Transceiver
- Cabling the Switch
- Cabling Twisted Pair Ports
- Cabling Fiber Optic Ports
- Powering on an AC Powered Switch
- Wiring and Powering on an DC Powered Unit
- Starting a Local Management Session
- Troubleshooting
- Technical Specifications
AT-8500 Series
Ethernet Switches
AT-8524M
AT-8550GB
Installation Guide
All rights reserved. No part of this publication may be reproduced without prior written permission from Allied Telesis, Inc.
Allied Telesis is a trademark of Allied Telesis, Inc. Microsoft and Internet Explorer are registered trademarks of Microsoft Corporation.
Netscape Navigator is a registered trademark of Netscape Communications Corporation. All other product names, company names, logos or
other designations mentioned herein are trademarks or registered trademarks of their respective owners.
Allied Telesis, Inc. reserves the right to make changes in specifications and other information contained in this document without prior
written notice. The information provided herein is subject to change without notice. In no event shall Allied Telesis, Inc. be liable for any
incidental, special, indirect, or consequential damages whatsoever, including but not limited to lost profits, arising out of or related to this
manual or the information contained herein, even if Allied Telesis, Inc. has been advised of, known, or should have known, the possibility of
Electrical Safety and Emissions Standards
RFI EmissionsFCC Class A, EN55022 Class A, EN61000-3-2, EN61000-3-3, VCCI
Immunity EN55024
U.S. Federal Communications Commission
Note: This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to Part 15
of FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the
equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency
energy and, if not installed and used in accordance with this instruction manual, may cause harmful interference to radio
communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case
the user will be required to correct the interference at his own expense.
Note: Modifications or changes not expressly approved of by the manufacturer or the FCC, can void your right to operate
Industry Canada
This Class A digital apparatus complies with Canadian ICES-003.
Cet appareil numérique de la classe A est conforme à la norme NMB-003 du Canada.
European Union Restriction of the Use of Certain Hazardous Substances
This Allied Telesis RoHS-compliant product conforms to the European Union Restriction of the Use of Certain Hazardous
Substances (RoHS) in Electrical and Electronic Equipment. Allied Telesis ensures RoHS conformance by requiring
supplier Declarations of Conformity, monitoring incoming materials, and maintaining manufacturing process controls.
Warning: In a domestic environment this product may cause radio interference in
which case the user may be required to take adequate measures.
Translated Safety Statements
Important: The indicates that a translation of the safety statement is available in a PDF
document titled “Translated Safety Statements” (613-000405) posted on the Allied Telesis website at
Contents
Preface ................................................................................................................................................................................11
Safety Symbols Used in this Document................................................................................................................................12
Where to Find Web-based Guides.......................................................................................................................................13
Contacting Allied Telesis......................................................................................................................................................14
Online Support ..............................................................................................................................................................14
Email and Telephone Support.......................................................................................................................................14
Returning Products........................................................................................................................................................14
For Sales or Corporate Information...............................................................................................................................14
Warranty........................................................................................................................................................................14
Management Software Updates....................................................................................................................................14
Chapter 1: Overview ..........................................................................................................................................................15
Model Configurations............................................................................................................................................................16
Model Descriptions...............................................................................................................................................................17
AT-8516F/SC ................................................................................................................................................................17
AT-8524M......................................................................................................................................................................18
AT-8524POE .................................................................................................................................................................19
AT-8550GB ...................................................................................................................................................................20
AT-8550SP....................................................................................................................................................................21
Port Descriptions..................................................................................................................................................................22
10/100Base-TX Twisted Pair Ports...............................................................................................................................22
10/100/1000Base-T Twisted Pair Ports.........................................................................................................................24
100Base-FX Fiber Optic Ports......................................................................................................................................25
Power Over Ethernet............................................................................................................................................................27
Power Budgeting...........................................................................................................................................................27
Implementation..............................................................................................................................................................28
GBIC and SFP Slots.............................................................................................................................................................29
Module Expansion Slots.......................................................................................................................................................30
LEDs.....................................................................................................................................................................................31
Twisted Pair Port LEDs and the LED Mode Select Button............................................................................................31
Fiber Optic Port LEDs...................................................................................................................................................34
GBIC and SFP Expansion Slot LEDs............................................................................................................................35
System LEDs.................................................................................................................................................................36
RS-232 Terminal Port...........................................................................................................................................................37
Power Options and Connectors............................................................................................................................................38
RPS Connector .............................................................................................................................................................38
AC Power Connector.....................................................................................................................................................39
DC Power Connector ....................................................................................................................................................39
A Few Basics about Ethernet Switching...............................................................................................................................40
MAC Address Table......................................................................................................................................................40
Duplex Mode.................................................................................................................................................................40
Store and Forward.........................................................................................................................................................41
Back Pressure and Flow Control...................................................................................................................................41
Network Topologies..............................................................................................................................................................43
Power Workgroup Topology..........................................................................................................................................43
Collapsed Backbone Topology......................................................................................................................................43
Mixed Topology.............................................................................................................................................................44
Chapter 2: Installation .......................................................................................................................................................47
Reviewing Safety Precautions..............................................................................................................................................48
6
Selecting a Site for the Switch..............................................................................................................................................51
Planning the Installation........................................................................................................................................................52
Unpacking the Switch...........................................................................................................................................................54
Installing the Switch in a Rack..............................................................................................................................................55
Installing an Optional Expansion or Stacking Module...........................................................................................................58
Installing an Optional GBIC...................................................................................................................................................60
Installing an Optional SFP Transceiver.................................................................................................................................62
Cabling the Switch................................................................................................................................................................64
Cabling Twisted Pair Ports............................................................................................................................................64
Cabling Fiber Optic Ports...............................................................................................................................................65
Cabling Expansion Modules..........................................................................................................................................67
Powering on an AC Powered Switch....................................................................................................................................68
Wiring and Powering on an DC Powered Unit......................................................................................................................70
Starting a Local Management Session.................................................................................................................................73
Warranty Registration...........................................................................................................................................................75
Chapter 3: Troubleshooting ..............................................................................................................................................77
PWR LED is Off....................................................................................................................................................................77
Twisted Pair Port Link LED is Off..........................................................................................................................................77
Fiber Optic Port Link LED is Off............................................................................................................................................78
PoE Device is Not Receiving Power.....................................................................................................................................79
Fault LED is On Continuously...............................................................................................................................................79
Cannot Establish a Local Management Session..................................................................................................................80
Appendix A: Technical Specifications.............................................................................................................................81
Physical Specifications.........................................................................................................................................................81
Environmental Specifications................................................................................................................................................81
Power Specifications.............................................................................................................................................................82
Safety and Electromagnetic Emissions Certifications...........................................................................................................82
RJ-45 Twisted Pair Port Pinouts...........................................................................................................................................83
AT-8516F/SC Fiber Optic Port Specifications.......................................................................................................................85
RS-232 Terminal Port Pinouts..............................................................................................................................................86
RPS Connector Port Pinouts ................................................................................................................................................87
Dual SC Type Connector......................................................................................................................................................90
Figures
Figure 1. AT-8516F/SC Switch Front and Back Panels 9
Figure 2. AT-8524M Switch Front and Back Panels 10
Figure 3. AT-8524POE Switch Front and Back Panels 11
Figure 4. AT-8550GB Switch Front and Back Panels 12
Figure 5. AT-8550SP Switch Front and Back Panels 13
Figure 7. SFP Transceiver 21
Figure 8. AT-RPS3004 Redundant Power Supply Unit 30
Figure 10. Collapsed Backbone Topology 36
Figure 12. Rack Mount Bracket Positions 47
Figure 14. Removing the Expansion Slot Faceplate 50
Figure 16. Securing the Module in the Expansion Slot 51
Figure 17. Optical Bore and Ferrule of GBIC Module 53
Figure 19. Connecting the Twisted Pair Data Cables 56
Figure 20. Removing the Dust Covers from the Fiber Optic Ports 57
Figure 22. Dual SC Port 58
Figure 24. Connecting the RPS DC Cable 61
Figure 25. Positive, Ground, and Negative Terminals 62
Figure 27. Connecting the Stripped Wire 63
Figure 28. Connecting an RS-232 Cable to the RS-232 Terminal Port on an AT-8524M Switch 65
Figure 30. RPS 16-pin Molex Connector Pin Layout 79
Figure 32. Dual SC Connector 82
8
Figure 1. AT-8516F/SC Switch Front and Back Panels.......................................................................................................17
Figure 2. AT-8524M Switch Front and Back Panels............................................................................................................18
Figure 3. AT-8524POE Switch Front and Back Panels.......................................................................................................19
Figure 4. AT-8550GB Switch Front and Back Panels..........................................................................................................20
Figure 5. AT-8550SP Switch Front and Back Panels..........................................................................................................21
Figure 6. GBIC Module........................................................................................................................................................29
Figure 7. SFP Transceiver...................................................................................................................................................29
Figure 8. AT-RPS3004 Redundant Power Supply Unit.......................................................................................................38
Figure 9. Power Workgroup Topology .................................................................................................................................43
Figure 10. Collapsed Backbone Topology...........................................................................................................................44
Figure 11. Mixed Topology..................................................................................................................................................45
Figure 12. Rack Mount Bracket Positions............................................................................................................................55
Figure 13. Removing the Feet.............................................................................................................................................56
Figure 14. Removing the Expansion Slot Faceplate............................................................................................................58
Figure 15. Installing a Module..............................................................................................................................................59
Figure 16. Securing the Module in the Expansion Slot........................................................................................................59
Figure 17. Optical Bore and Ferrule of GBIC Module..........................................................................................................61
Figure 18. Installing a GBIC Module....................................................................................................................................61
Figure 19. Connecting the Twisted Pair Data Cables..........................................................................................................64
Figure 20. Removing the Dust Covers from the Fiber Optic Ports.......................................................................................65
Figure 21. Attaching a Fiber Optic Cable.............................................................................................................................66
Figure 22. Dual SC Port.......................................................................................................................................................66
Figure 23. Connecting the AC Power Cord..........................................................................................................................68
Figure 24. Connecting the RPS DC Cable...........................................................................................................................69
Figure 25. Positive, Ground, and Negative Terminals.........................................................................................................70
Figure 26. Stripped Wire......................................................................................................................................................71
Figure 27. Connecting the Stripped Wire.............................................................................................................................71
Figure 28. Connecting an RS-232 Cable to the RS-232 Terminal Port on an AT-8524M Switch........................................73
Figure 29. RJ-45 Connector and Port Pin Layout................................................................................................................83
Figure 30. RPS 16-pin Molex Connector Pin Layout...........................................................................................................87
Figure 31. AT-8524POE RPS Connector Pin Layout ..........................................................................................................88
Figure 32. Dual SC Connector.............................................................................................................................................90
Table 1. Safety Symbols .....................................................................................................................................................12
Table 2. Model Configurations ............................................................................................................................................16
Table 3. IEEE 802.3af Class vs. Power Levels ..................................................................................................................28
Table 4. LEDs for the 10/100Base-TX Twisted Pair Ports on the AT-8524M, AT-8550GB, and AT-8550SP Switches .....31
Table 5. LEDs for Ports 49R and 50R on the AT-8550GB and AT-8550SP Switches.......................................................32
Table 6. LEDs for the 10/100Base-TX Twisted Pair Ports on the AT-8524POE Switch .....................................................33
Table 7. LEDs for the Fiber Optic Ports on the AT-8516F/SC Switch ................................................................................35
Table 8. LEDs for the Optional GBIC and SFP Ports on an AT-8550GB and AT-8550SP Switches.................................35
Table 9. System LEDs ........................................................................................................................................................36
Table 10. Twisted Pair Cabling and Distances ...................................................................................................................52
Table 11. Fiber Optic Cabling and Distances .....................................................................................................................53
Table 12. 10/100Base-TX Port MDI/MDI-X Pin Signals ....................................................................................................83
Table 13. 10/100Base-T Port MDI/MDI-X Pin Signals with PoE .........................................................................................83
Table 14. MDI and MDI-X Pin Signals (1000Base-T) .........................................................................................................84
Table 15. RS-232 Terminal Port Pin Signals ......................................................................................................................86
Table 16. Pin Definitions of the 16-pin RPS Connector ......................................................................................................87
Table 17. Pin Definitions for the RPS Connector on the AT-8524POE Switch ...................................................................88
10
Preface
This guide provides the hardware installation instructions for you
managed, Layer 2+ AT-8500 Series Fast Ethernet switch. This preface
“Safety Symbols Used in this Document” on page 12
“Contacting Allied Telesis” on page 14
12
This document uses the safety symbols defined in Table 1.
Symbol MeaningDescription
CautionPerforming or omitting a specific action may
WarningPerforming or omitting a specific action may
AT-8500 Series Layer 2+ Fast Ethernet Switches Installation Guide
Where to Find Web-based Guides
The installation and user guides for all Allied Telesis products are available
in portable document format (PDF) on our web site at
www.alliedtelesis.com. You can view the documents online or download
14
This section provides Allied Telesis contact information for technical
support as well as sales or corporate information.
Online SupportYou can request technical support online by accessing the Allied Telesis
www.alliedtelesis.com/support. You can use the Knowledge Base to
submit questions to our technical support staff and review answers to
Email and
Support
For Technical Support via email or telephone, refer to the Allied Telesis
web site: www.alliedtelesis.com. Select your country from the list
displayed on the website. Then select the appropriate menu tab.
Products
Products for return or repair must first be assigned a Return Materials
Authorization (RMA) number. A product sent to Allied Telesis without a
RMA number will be returned to the sender at the sender’s expense.
To obtain an RMA number, contact the Allied Telesis Technical Support
group at our web site: www.alliedtelesis.com/support/rma. Select your
country from the list displayed on the website. Then select the appropriate
For Sales or
Information
You can contact Allied Telesis for sales or corporate information at our
web site: www.alliedtelesis.com. Select your country from the list
displayed on the website. Then select the appropriate menu tab.
Warranty The AT-8500 Series Layer 2+ Fast Ethernet Switches have a Lifetime
Warranty (two years fan and PSU). Go to www.alliedtelesis.com/
warranty for the specific terms and conditions of the warranty and for
Management
New releases of management software for our managed products are
available from either of the following Internet sites:
rAllied Telesis FTP server: ftp://ftp.alliedtelesis.com
If you prefer to download new software from the Allied Telesis FTP server
from your workstation’s command prompt, you will need FTP client
software and you must log in to the server. Enter “anonymous” for the user
Chapter 1
The AT-8500 Series switches are managed, Layer 2+ Fast Ethernet
switches. These switches are designed to simplify the task of creating or
expanding an Ethernet or Fast Ethernet network. This chapter contains the
“Model Configurations” on page 16
“Port Descriptions” on page 22
“GBIC and SFP Slots” on page 29
“LEDs” on page 31
“Power Options and Connectors” on page 38
“A Few Basics about Ethernet Switching” on page 40
16
Table 2 lists the basic model configurations.
Model Configuration
AT-8516F/SC 16 100Base-FX ports with dual SC connectors plus
twisted pair port expansion modules.
AT-8524M24 10/100Base-TX ports plus two expansion slots for
optional fiber optic and twisted pair port expansion
AT-8524POE24 10/100Base-TX ports with Power Over Ethernet
technology, plus two expansion slots for optional
fiber optic and twisted pair port expansion modules.
AT-8550GB48 10/100Base-TX ports, two 10/100/1000Base-T
modules.
AT-8550SP48 10/100Base-TX ports, two 10/100/1000Base-T
modules.
AT-8500 Series Layer 2+ Fast Ethernet Switches Installation Guide
Model Descriptions
AT-8516F/SC The AT-8516F/SC switch has 16 100Base-FX fiber optic ports with dual
SC connectors. The ports operate at 100 Mbps, half- or full-duplex mode,
and have a maximum operating distance of 2 kilometers (1.24 miles) or
412 meters (1,360 feet), depending on the duplex mode, using 50/125 or
62.5/125 micron (core/cladding) multimode fiber optic cable.
Figure 1 illustrates the front panel of the AT-8516F/SC switch.
Figure 1. AT-8516F/SC Switch Front and Back Panels
RPS
PWR
1817
L/A
L/A
L/A
L/A
L/A
L/A
L/A
L/A
L/A
L/A
L/A
L/A
L/A
L/A
L/A
L/A
HALF DUP/
FULL DUP
PORT ACTIVITY
100Base-FX Fast Ethernet Switch
1TX RX
2TX RX
3TX RX
4TX RX
5TX RX
6TX RX
7TX RX
8TX RX
Module Expansion Slots100Base-FX PortsTerminal Port
Port LEDs
~
AC Power Connector
18
AT-8524M The AT-8524M switch has 24 10/100Base-TX twisted pair ports and two
module expansion slots. The twisted pair ports feature RJ-45 connectors
and have a maximum operating distance of 100 meters (328 feet) using
Category 3 or better 100 ohm twisted pair cable for 10Base-T operation
and Category 5 or 5E 100 ohm twisted pair cable for 100Base-TX
The expansion slots are compatible with 100Base and 1000Base fiber
optic and twisted pair port expansion modules and the AT-STACKM
Figure 2 shows the front and back panels of the AT-8524M switch.
246810 12 14 16 18 20 22 24
MODE
MODE
100
ACT
RPS
PWR
1357 911
13 15 1719 21 23
STATUS
AT-8524M
Port Status
Select Button
LEDs
100-240VAC
RPS INPUT
Terminal Port
AT-8500 Series Layer 2+ Fast Ethernet Switches Installation Guide
AT-8524POE The AT-8524POE switch has 24 10/100Base-TX ports with Power over
Ethernet (PoE) capability. (For a description of this feature, refer to “Power
Over Ethernet” on page 27.) The ports feature RJ-45 connectors and have
a maximum operating distance of 100 meters (328 feet) using twisted pair
cable. The ports, when not using PoE, can use Category 3 or better 100
ohm twisted pair cable for 10Base-T operation and Category 5 or 5E 100
ohm twisted pair cable for 100Base-TX operation. For ports using PoE,
Category 5 or 5E 100 ohm twisted pair cable is required for both 10 and
The switch also features two expansion slots that are compatible with
100Base and 1000Base fiber optic and twisted pair port expansion
Figure 3 shows the front and back panels of the AT-8524POE switch.
1357911 13 15 17 19 21 23
FAULT
MASTER
MODE
246810 12
14 16 1820 22 24
26
AT-8524POE
HDX
FDX
PD ONMAX CURRENTPD ERR
~
RPS INPUT VDCA Max
12V
8.5A
15A
Module Expansion SlotsPort Status
LED Mode
System
RS-232
AC Power ConnectorRPS Connector
20
AT-8550GB The AT-8550GB switch has 48 10/100Base-TX twisted pair ports, capable
of operating at either 10 or 100 Mbps, with RJ-45 connectors. These ports
have a maximum operating distance of 100 meters (328 feet) using
Category 3 or better 100 ohm twisted pair cable for 10Base-T operation
and Category 5 or 5E 100 ohm twisted pair cable for 100Base-TX
The switch has two 10/100/1000Base-T twisted pair ports, labelled Ports
49R and 50R. They have RJ-45 connectors, require Category 5 or 5E 100
ohm twisted pair cable, and have a maximum operating distance of 100
The switch also has two slots for two Gigabit Interface Converters
(GBICs). You can use the GBICs to add 1000Base-X fiber optic ports to
the switch to extend the distance of your network. For a list of GBICs
supported by the switch, contact your Allied Telesis sales representative
or refer to the Allied Telesis web site: www.alliedtelesis.com.
The twisted pair ports 49R and 50R change to a redundant status
when GBICs are installed and establish links with their end nodes. A
link on a GBIC port always takes precedence over that of the
corresponding 10/100/1000Base-T twisted pair port.
Figure 4 shows the front and back panels of the AT-8550GB switch.
SPD
ACT
RPS
PWR
AT-8550GB Fast Ethernet Switch
LINK
MAIN PORTS
11 131517 1921 2325 27 293133 35 37394143 45 47
24681012 14 1618 2022 2426 28 303234 3638 40 42444648
49
GBIC
CLASS 1
MODE
Port LEDs
GBIC Slots
~
Terminal Port
LED Mode
System
AT-8500 Series Layer 2+ Fast Ethernet Switches Installation Guide
AT-8550SP The AT-8550SP switch has 48 10/100Base-TX twisted pair ports with
RJ-45 connectors. The ports have a maximum operating distance of 100
meters (328 feet) using Category 3 or better 100 ohm twisted pair cable for
10Base-T operation and Category 5 or 5E 100 ohm twisted pair cable for
The switch also features two 10/100/1000Base-T twisted pair ports,
labelled Ports 49R and 50R. They have RJ-45 connectors, require
Category 5 or 5E 100 ohm twisted pair cable, and have a maximum
There are also two slots for two Small Form-factor Pluggable (SFP)
transceivers. You can use the slots to add 1000Base-X fiber optic ports to
the switch. For a list of supported SFP transceivers, contact your Allied
Telesis sales representative or refer to the Allied Telesis web site:
The twisted pair ports 49R and 50R change to a redundant status
when SFP transceivers are installed and establish links with their
end nodes. A link on an SFP port always takes precedence over that
of the corresponding 10/100/1000Base-T twisted pair port.
Figure 5 shows the front and back panels of the AT-8550GB switch.
SPD
ACT
RPS
PWR
AT-8550SP Fast Ethernet Switch
LINK
MAIN PORTS
11 13 1517 1921 2325 27 293133 35 37 3941 43 4547
24681012 141618 20 22 2426 28 303234 3638 40 42444648
49
SFP
CLASS 1
MODE
SFP Slots
~
Terminal Port
10/100Base-TX Ports
Select Button
LEDs
22
This section provides information on the following port types found on the
“10/100Base-TX Twisted Pair Ports,” next
“10/100/1000Base-T Twisted Pair Ports” on page 24
10/100Base-TX
Ports
This section applies to the AT-8524M, AT-8524POE, AT-8550GB, and
Type of Connector
The 10/100Base-TX twisted pair ports feature 8-pin RJ-45 connectors.
Only four of the pins are used when a port is operating at 10 or 100 Mbps
The twisted pair ports are 10/100Base-TX compliant and are capable of
10 megabits per second (Mbps) or 100 Mbps speeds. You can set the port
speed manually or, because the ports are IEEE 802.3u Auto-Negotiation
compliant, you can let the switch set each port’s speed automatically. With
Auto-Negotiation, the switch automatically matches the highest possible
common speed between each switch port and each end node. For
example, if an end node is capable of only 10 Mbps, the switch sets the
Auto-Negotiation is activated as the default on all twisted pair ports
on the switch. To deactivate Auto-Negotiation and set the speeds
manually, refer to the AT-S62 Management Software User’s Guides.
Each twisted pair port on the switch can operate in either half- or full-
duplex mode. The twisted pair ports are IEEE 802.3u-compliant and will
If desired, you can disable Auto-Negotiation on one or all of the switch
ports so that you can set the duplex mode manually through the switch’s
AT-8500 Series Layer 2+ Fast Ethernet Switches Installation Guide
In order for a switch port to successfully Auto-Negotiate its duplex
mode with an end node, the end node should also be using Auto-
Negotiation. Otherwise, a duplex mode mismatch can occur. A
switch port using Auto-Negotiation will default to half-duplex if it
detects that the end node is not using Auto-Negotiation. This will
result in a mismatch if the end node is operating at a fixed duplex
To avoid this problem, when you connect an end node with a fixed
duplex mode of full-duplex to a switch port, you should use the
AT-S62 management software to disable Auto-Negotiation on the
port and set the port speed and duplex mode manually.
Each twisted pair port has a maximum operating distance of 100 meters
Type of Cabling
For 10 Mbps operation, Category 3 or better 100 ohm shielded or
unshielded twisted pair cabling is required. For 100 Mbps operation,
Category 5 or Enhanced Category 5 (5E) 100 ohm shielded or unshielded
Auto-MDI/MDI-X
The twisted pair ports are auto-MDI/MDI-X. They automatically configure
themselves as either MDI or MDI-X, depending on the configuration of the
port on the end node. This feature allows you to use either straight-through
or crossover twisted pair cables to connect devices to the ports.
The auto-MDI/MDI-X feature on a port is available only when the
port is set to Auto-Negotiation. If you disable Auto-Negotiation and
set a port’s speed and duplex mode manually, the port defaults to
MDI-X. For instructions on configuring a port, refer to theAT-S62
Port Pinouts
For the port pinouts for the AT-8524M, AT-8550GB, and AT-8550SP
switches, refer to Table 12 on page 83. For the port pinouts for the
24
1000Base-T
Ports
This section applies to Port 49R and Port 50R on the AT-8550GB and
Type of Connector
The ports have 8-pin RJ-45 connectors. The ports use four pins when
operating at 10 or 100 Mbps and all eight pins when operating at
Speed
The ports can operate at 10, 100, or 1000 Mbps. The speed is set
automatically through Auto-Negotiation or you can set the speed to 10 or
100 Mbps manually through the management software.
Ports 49R and 50R can operate at 1000 Mbps only when set to
Auto-Negotiation. You cannot manually set these ports to 1000
Duplex Mode
The ports can operate in either half- or full-duplex mode. The ports are
IEEE 802.3u compliant and will Auto-Negotiate the duplex mode. If
needed, Auto-Negotiation can be disabled so that you can set the duplex
In order for a 10/100/1000Base-T port to successfully Auto-
Negotiate its duplex mode with an end node, the end node should
also be using Auto-Negotiation. Otherwise, a duplex mode
mismatch can occur. A port, using Auto-Negotiation, will default to
half-duplex if it detects that the end node is not using Auto-
Negotiation. This will result in a mismatch if the end node is
To avoid this problem, when you connect an end node with a fixed
duplex mode of full-duplex to a 10/100/1000Base-T port, you should
use the AT-S62 management software to disable Auto-Negotiation
on the port and set the port speed and duplex mode manually.
The ports have a maximum operating distance of 100 meters (328 feet).
AT-8500 Series Layer 2+ Fast Ethernet Switches Installation Guide
For 10 Mbps, the port requires Category 3 or better 100 ohm shielded or
unshielded twisted pair cabling. For 100 or 1000 Mbps operation, the ports
require Category 5 or Enhanced Category 5 (5E) 100 ohm shielded or
Auto-MDI/MDI-X
The ports are auto-MDI/MDI-X. They automatically configure themselves
as either MDI or MDI-X. This feature allows you to use a straight-through
twisted pair cable to connect any type of device to a port.
The auto-MDI/MDI-X feature on a 10/100/1000Base-T port is
functional only when the port is set to Auto-Negotiation. If you
disable Auto-Negotiation and set the port’s speed and duplex mode
manually, the port defaults to MDI-X. For instructions on configuring
a port, refer to the AT-S62 Management Software User’s Guides.
For the pinouts of these ports when operating at 10 or 100 Mbps, refer to
Table 12 on page 83. For port pinouts when the ports are operating at
100Base-FX
This section applies to the AT-8516F/SC switch.
The fiber optic ports on the AT-8516F/SC switch have dual SC connectors.
The fiber optic ports have a fixed operating speed of 100 megabits per
Duplex Mode
The fiber optic ports can operate in either half- or full-duplex mode. You
can set the duplex mode manually or allow the switch to set it
Maximum Distance
Each fiber optic port has a maximum operating distance of two kilometers
(1.25 miles) when operating in full-duplex mode and 412 meters (1,360
26
The fiber optic ports can use either 50/125 or 62.5/125 micron multimode
Do not use single-mode fiber optic cable with these ports.
AT-8500 Series Layer 2+ Fast Ethernet Switches Installation Guide
Power Over Ethernet
The following discussion applies only to the AT-8524POE switch.
The twisted pair ports on the AT-8524POE switch feature Power over
Ethernet (PoE). PoE is a mechanism for supplying power to network
devices over the same twisted pair cables used to carry network traffic.
This feature can simplify network installation and maintenance by allowing
you to use the switch as a central power source for other network devices.
A device that receives its power over an Ethernet cable is called a
powered device. Examples of such devices can be wireless access points,
IP telephones, web cams, and even other Ethernet switches. A powered
device connected to a port on the switch will receive both network traffic
There are several advantages that the PoE feature of the AT-8524POE
switch adds to the installation and maintenance of your network. First,
because the switch acts as the central power source for your powered
devices, adding an uninterruptible power source (UPS) to the switch
increases the protection not just to the switch itself from possible power
source problems but also to all of the powered devices connected to it.
This can increase the reliability of your network by minimizing the impact
PoE can also simplify the installation of your network. A frequent issue in
selecting a location for a network device is whether there is a power
source nearby. This often limits equipment placement or requires the
added cost and time of having additional electrical sources installed. With
PoE, you can install PoE-compatible network equipment wherever they
are needed without having to worry about whether they are near a power
The switch automatically determines whether or not a device connected to
a port is a powered device. A powered device has a signature resistor or
signature capacitor that the switch can detect over the Ethernet cabling. If
the resistor or capacitor is present, the switch assumes that the device is a
Power BudgetingThe AT-8524POE Layer 2+ Fast Ethernet Switch provides a maximum of
15.4 W of power per port on all 24 ports for a total power consumption of
370 W, while at the same time furnishing standard 10/100 Mbps Ethernet
The AT-8524POE smart power management functionality supports any
combination of Ethernet ports (1-24) that supply power for IEEE 802.3af
Class 0, 1, 2, or 3 powered devices up to a maximum of 370 watts, as
28
A port connected to a network node that is not a powered device (that is, a
device that receives its power from another power source) functions as a
regular Ethernet port, without PoE. The PoE feature remains enabled on
Implementation A standard Ethernet twisted pair cable contains four pairs of strands for a
total of eight strands. 10/100 Mbps network traffic requires only four
strands (1, 2, 3, and 6), leaving four strands in the cable unused (4, 5, 7,
The PoE standard, IEEE 802.3af, describes two alternative ways for
delivering power to a powered device (PD) over twisted pair cabling.
Alternative A uses the same strands that carry the network traffic.
Alternative B uses the spare strands. The PoE implementation on the AT-
8524POE Layer 2+ Fast Ethernet Switch is Alternative A, where power is
PD’s that comply with the IEEE 802.3af standard typically support both
power delivery methods. So long as a PD is compliant with the standard, it
should be able to receive its power from the switch while using either a
straight or cross-over cable. The PoE feature on the AT-8524POE Layer
2+ Fast Ethernet Switch should also work with most legacy PD’s as long
as the device can be powered on pins 1, 2, 3, and 6. A legacy device is a
node that was manufactured before the IEEE 802.3af standard was
completed and, consequently, may not adhere to the standard. If this is
the case, a straight (MDI) cable may be needed to insure that the DC
Table 3. IEEE 802.3af Class vs. Power Levels
Minimum Power
the PSE
Levels Output at
0Default15.4W0.44W to 12.95W
2Optional7.0W3.84W to 6.49W
AT-8500 Series Layer 2+ Fast Ethernet Switches Installation Guide
GBIC and SFP Slots
The AT-8550GB switch has two GBIC slots, and AT-8550SP switch has
two SFP slots. The slots are labelled Port 49 and Port 50. Each slot can
accommodate one optional fiber optic Gigabit Interface Converter (GBIC)
These modules are a fast and easy way for you to add an 1000 Mbps fiber
optic port to your Fast Ethernet switch. You can use the modules to extend
the distance of your network, build a high-speed backbone network
between switches, or connect additional end nodes to the network, such
Figure 6 shows an example of a fiber optic GBIC, and Figure7 shows an
Figure 6. GBIC Module
When you install a GBIC or SFP in Port 49 or Port 50 and the module
establishes a link with its end node, the corresponding twisted pair port,
Port 49R or 50R, changes to a redundant status. A link on a GBIC or SFP
port always takes precedence over that of the corresponding 10/100/
For a list of the GBIC and SFP modules supported by the
AT-8550GB and AT-8550SP switches, contact your Allied Telesis
sales representative or refer to our web site at:
30
The AT-8516F/SC, AT-8524M, and AT-8524POE switches have two
expansion slots. Each slot can accommodate an expansion module. You
can use the slots to add 100Base and 1000Base fiber optic and twisted
For a list of the Allied Telesis expansion modules supported by the
switches, contact your Allied Telesis sales representative or refer to
AT-8500 Series Layer 2+ Fast Ethernet Switches Installation Guide
LEDs
This section provides information on the LEDs found on the AT-8500
“Twisted Pair Port LEDs and the LED Mode Select Button,” next
“GBIC and SFP Expansion Slot LEDs” on page 35
Twisted Pair Port
LED Mode Select
This section applies to the AT-8524M, AT-8524POE, AT-8550GB, and
The port LEDs on the front panel display port status information. Each port
has two LEDs. One of the LEDs displays the status of the link between a
port and its end node. The second LED, labeled MODE, displays a variety
of status information, depending on the switch model. You use the Mode
Select button on the front panel to toggle the Mode LEDs to display
different status information. The LEDs next to the Mode Select button
indicate the status being displayed by the port Mode LEDs.
Toggling the Mode Selection button does not affect the normal
Table 4 describes the LEDs for the 10/100Base-TX twisted pair ports on
Table 4. LEDs for the 10/100Base-TX Twisted Pair Ports on the
LED StateDescription
LINKOFFIndicates that there is no link between the
GreenIndicates a valid link has been established
Mode - COLOFFIndicates that no data collisions are
Flashing
Indicates that data collisions are occurring
32
Table 5 describes the LEDs for the 10/100/1000Base-TX twisted pair
ports, Ports 49R and 50R, on the AT-8550GB and AT-8550SP switches.
(AT-8524M)
Mbps.
Mbps.
(AT-8550GB
AT-8550SP)
Mbps.
Mbps.
(AT-8524M)
duplex mode.
GreenIndicates that the port is operating in full-
MODE - FDX
and
OFFIndicates that the port is operating in half-
GreenIndicates that the port is operating in full-
Mode - ACTOFFIndicates that there is no activity on the port.
Green
receiving data packets.
Table 5. LEDs for Ports 49R and 50R on the AT-8550GB and AT-8550SP
LED StateDescription
LINKOFFIndicates that there is no link between the
GreenIndicates a valid link has been established
Mode - COLOFFIndicates that no data collisions are occurring
Flashing
Indicates that data collisions are occurring on
Table 4. LEDs for the 10/100Base-TX Twisted Pair Ports on the
AT-8524M, AT-8550GB, and AT-8550SP Switches (Continued)
AT-8500 Series Layer 2+ Fast Ethernet Switches Installation Guide
Table 6 describes the LEDs for the 10/100Base-TX twisted pair ports on
Mode - SPDOFFIndicates that the port is operating at 10 or
GreenIndicates that the port is operating at 1000
Mode - FDXOFFIndicates that the port is operating in half-
GreenIndicates that the port is operating in full-
Mode - ACTOFFIndicates that there is no activity on the port.
Green
receiving data packets.
Table 6. LEDs for the 10/100Base-TX Twisted Pair Ports on the
LED StateDescription
L/AOFFIndicates that the port has not established a
Steady
Indicates the port has established a valid
Flashing
Indicates the port is receiving or transmitting
Steady
Indicates the port has established a valid 10
Flashing
Indicates the port is receiving or transmitting
Table 5. LEDs for Ports 49R and 50R on the AT-8550GB and AT-8550SP
LED StateDescription
34
LEDs
This section applies to the AT-8516F/SC switch. The fiber optic ports on
an AT-8516F/SC switch have two LEDs, labeled L/A and D/C. The LEDs
Mode - DCOFFIndicates that the port has not established a
Steady
Indicates that the port is operating in full
Steady
Indicates that the port is operating in half
Flashing
Indicates that the port is operating in half
occurring on the port.
Mode - POEOFFIndicates that the device connected to the
require PoE.
device and that the port is providing power
Steady
Indicates that the port experienced a
further information, refer to Chapter 3,
Flashing
Indicates that the port is connected to a
it would exceed the maximum PoE power
information, refer to Chapter 3,
Table 6. LEDs for the 10/100Base-TX Twisted Pair Ports on the
LED StateDescription
AT-8500 Series Layer 2+ Fast Ethernet Switches Installation Guide
are defined in Table 7.
The AT-8516F/SC switch does not have an LED Mode Select
GBIC and SFP
LEDs
The GBIC and SFP slots on the AT-8550GB and AT-8550SP switches,
respectively, have two LEDs. The LEDs display the operating status of the
fiber optic port. Use the Mode Select button on the switch to toggle the
status information displayed by the MODE LED. The LEDs are defined in
Table 7. LEDs for the Fiber Optic Ports on the AT-8516F/SC Switch
L/AOFFIndicates no link has been established between
GreenIndicates a valid link exists between the port
Flashing
Indicates that the port is transmitting and/or
D/CGreenIndicates that the port is operating in full-duplex
AmberIndicates that the port is operating in half-duplex
Flashing
Indicates that data collisions are occurring on
Table 8. LEDs for the Optional GBIC and SFP Ports on an AT-8550GB and
LED StateDescription
LINKOFFIndicates that there is no link between the
Solid
Indicates a valid link has been established
Mode - COLOFFIndicates that no data collisions are
Flashing
Indicates that data collisions are occurring
36
System LEDsThe system LEDs on the front panel display general status information, as
Mode - SPDSolid
Indicates that the port is operating at 1000
Mode - FDXOFFIndicates that the port is operating in
Solid
Indicates that the port is operating in
Mode - ACTOFFIndicates that there is no activity on the port.
Green
receiving data packets.
Table 8. LEDs for the Optional GBIC and SFP Ports on an AT-8550GB and
LED StateDescription
LED StateDescription
or FLT
RedIndicates that the management software is
goes off once the configuration has been
If the FAULT LED remains on, the switch or
malfunction. Refer to Chapter 3,
on how to troubleshoot a problem.
R or
GreenIndicates that the switch is functioning as the
OFFIndicates that the switch is a slave switch or is
RPSGreenIndicates that an optional redundant power
OFFIndicates that there is no optional redundant
PWRGreenIndicates that the switch is receiving power.
AT-8500 Series Layer 2+ Fast Ethernet Switches Installation Guide
RS-232 Terminal Port
You can use the RS-232 terminal port to establish a local (out-of-band)
management session with the switch and to configure the switch’s
operating parameters. You establish a local management session with the
switch by connecting either a terminal or a personal computer with a
You are not required to manage an AT-8500 Series switch. If the
default switch settings are adequate for your network, you can use
the unit as an unmanaged switch. For the default settings, refer to
The RS-232 terminal port has a DB-9 female connector and uses a
straight-through RS-232 cable (included with the switch). The default
Baud rate: 9600 bps
Parity: None
Flow control: None
These settings are for a DEC VT100 or ANSI terminal, or an
38
This section provides information about the power options and features on
“RPS Connector,” next
“DC Power Connector” on page 39
RPS ConnectorThe RPS connector on the back panel of the switch connects to an
optional AT-RPS3004 or AT-RPS3104 redundant power supply unit.
Figure 8 illustrates an AT-RPS3004 unit. A redundant power supply unit
can provide power to the switch in the event the switch’s internal power
The AT-RPS3004 unit is used with the AT-8516F/SC, AT-8524M,
AT-8550GB, and AT-8550SP switches. The AT-RPS3104 unit is
used with the AT-8524POE switch. Do not use the AT-RPS3004 unit
A redundant external power supply comes with one pre-installed power
module and has three empty slots for additional power modules. Each
power module can support one switch, making the unit capable of
Figure 8. AT-RPS3004 Redundant Power Supply Unit
DC models of the AT-8500 Series switches do not feature an RPS
AT-8500 Series Layer 2+ Fast Ethernet Switches Installation Guide
AC Power
The switch has a single AC power supply socket on the back panel, which
has autoswitch AC inputs. To power the switch on or off, you connect or
Refer to Appendix A, “Technical Specifications” on page 81 for the input
DC Power
Some models of the AT-8500 Series switch are offered with a DC terminal
block on the back panel instead of an AC socket, for those network
installations that require DC equipment. Refer to Appendix A, “Technical
Specifications” on page 81, for the input voltage range and “Wiring and
Powering on an DC Powered Unit” on page 70, for instructions on how to
40
An Ethernet switch interconnects network devices, such as workstations,
printers, routers, and other Ethernet switches, so that they can
communicate with each other by sending and receiving Ethernet frames.
Table
Every hardware device in your network has a MAC address and each
MAC address is unique. The address is assigned to a device by the
device’s manufacturer. For example, the network interface cards that you
install in your computers have a unique MAC address assigned to them by
An AT-8500 Series Fast Ethernet Switch has a MAC address table
capable of storing up to 8,000 MAC addresses. The switch uses the table
to store the MAC addresses of the network end nodes connected to the
ports, along with the port number on which each address was learned.
A switch learns the MAC addresses of the end nodes by examining the
source address of each packet received on a port. It adds the address and
port on which the packet was received to the MAC table if the address had
not already been entered in the table. The result is a table that contains all
the MAC addresses of the devices that are connected to the switch’s
ports, and the port number where each address was learned.
When the switch receives a packet, it also examines the destination
address and, by referring to its MAC address table, determines the port on
which the destination end node is connected. It then forwards the packet
to the appropriate port and on to the end node. This increases network
bandwidth by limiting each packet to the appropriate port when the
intended end node is located, freeing the other switch ports for receiving
If the switch receives a packet with a destination address that is not in the
MAC address table, it floods the packet to all the ports on the switch. If the
ports have been grouped into virtual LANs, the switch floods the packet
only to those ports which belong to the same VLAN as the port on which
the packet was received. This prevents packets from being forwarded into
inappropriate LAN segments, increasing network security. When the
destination an end node responds, the switch adds its MAC address and
If the switch receives a packet with a destination address that is on the
same port on which the packet was received, it discards the packet
without forwarding it on to any port. Because both the source end node
and the destination end node for the packet are located on the same port
on the switch, there is no reason for the switch to forward the packet.
Duplex ModeDuplex mode refers to the manner in which an end node receives and
AT-8500 Series Layer 2+ Fast Ethernet Switches Installation Guide
transmits data. If an end node can receive or transmit data, but not both
simultaneously, the end node is operating in what is referred to as half-
duplex mode. If an end node can both receive and transmit data
simultaneously, the end node is said to be operating in full-duplex mode.
Naturally, an end node capable of operating in full-duplex can handle data
much faster than an end node that can only operate in half-duplex mode.
The twisted pair ports on the AT-8500 Series switches can operate in
either half- or full-duplex mode. The twisted pair ports are IEEE 802.3u-
compliant and will Auto-Negotiate the duplex mode setting for you.
By allowing the switch to configure the duplex mode for each port, you will
not need to change the setting for a port on the switch should you replace
an end node with an end node that has a different duplex mode capability.
With Auto-Negotiation, the switch automatically resets the port to a new
If desired, you can disable Auto-Negotiation on the switch ports so that
you can set the duplex mode manually through the switch’s management
In order for a switch port to successfully Auto-Negotiate its duplex
mode with an end node, the end node should also be using Auto-
Negotiation. Otherwise, a duplex mode mismatch can occur. A
switch port, using Auto-Negotiation, defaults to half-duplex if it
detects that the end node is not using Auto-Negotiation. This results
in a mismatch if the end node is operating at a fixed duplex mode of
Consequently, when you connect an end node with a fixed duplex
mode of full-duplex to a switch port, you should use the AT-S62
management software to disable Auto-Negotiation on the port and
Store and
These Fast Ethernet switches use store and forward as the method for
receiving and transmitting frames. When an Ethernet frame is received on
a switch port, the switch does not retransmit the frame out the destination
port until it has received the entire frame and stored the frame in a port
buffer. It then examines the frame to determine if it is a valid frame. Invalid
frames, such as fragments or runts, are discarded by the switch. This
ensures that only valid frames are transmitted out the switch ports and that
damaged frames are not propagated on your network.
and Flow Control
To maintain the orderly movement of data between the end nodes, an
Ethernet switch may periodically need to signal an end node to stop
42
How a switch signals an end node to stop transmitting data differs
depending on the speed and duplex mode of the end node and switch
port. A twisted pair port operating at 100 Mbps port and half-duplex mode
stops an end node from transmitting data by forcing a collision. A collision
on an Ethernet network occurs when two end nodes attempt to transmit
data using the same data link at the same time. A collision causes end
nodes to stop sending data. When the switch needs to stop a 100 Mbps,
half-duplex end node from transmitting data, it forces a collision on the
data link, which stops the end node. After the switch is ready to receive
data again, the switch stops forcing collisions. This is referred to as back
A port operating at 100 Mbps and full-duplex mode uses PAUSE frames,
as specified in the IEEE 802.3x standard, to stop the transmission of data
from an end node. Whenever the switch wants an end node to stop
transmitting data, it issues this frame. The frame instructs the end node to
cease transmission. The switch continues to issue PAUSE frames until it
is ready again to receive data from the end node. This is referred to as
Mcculloch Mac 6 Chainsaw Manual
AT-8500 Series Layer 2+ Fast Ethernet Switches Installation Guide
Network Topologies
This section illustrates several of the network topologies you can create
Power
Topology
The topology shown in Figure 9 is commonly referred to as a power
workgroup topology. Each workstation or end node is connected directly to
a port on an AT-8524M Fast Ethernet Switch. This provides each end
node with a dedicated data link to the switch for best performance and
reliability. The devices can operate at either 10 Mbps or 100 Mbps.
Collapsed
Topology
In the topology illustrated in Figure 10, an AT-8524M Fast Ethernet Switch
connects together 10/100 Mbps Ethernet hubs. This type of topology is
often referred to as a collapsed backbone topology. The switch functions
as the focal point of the network by acting as a bridge between the
different workgroups. The switch transfers an Ethernet frame from hub to
hub only when the destination end node for the frame is on a different hub
than the end node that originated the frame. This reduces the amount of
unnecessary data traffic in each workgroup, freeing up bandwidth and
AT-8524M
10 Mbps
AT-8524M Fast
44
Mixed TopologyYou can always combine topologies as well as build a larger network by
connecting different switches together. If the switches are within 100
meters (328 feet) of each other, you can use the twisted pair ports. If the
switches are further apart, then you can use fiber optic ports.
AT-8524M
15
3
15
3
15
3
Hubs
10 Mbps
AT-8524M Fast
AT-8500 Series Layer 2+ Fast Ethernet Switches Installation Guide
Figure 11 illustrates a network of three AT-8524M Fast Ethernet switches.
The workstations and servers on the network are connected either directly
to a switch or indirectly through an Ethernet hub. The switches themselves
are connected together through 1000Base fiber optic ports on AT-A45/SC
expansion modules, creating a high-speed backbone.
AT-8524M
15
3
15
3
AT-8524M
Ethernet Switch
Ethernet Switch
Ethernet Switch
10 Mbps
1000 Mbps
46
Chapter 2
This chapter provides the installation procedures for the switch and
“Reviewing Safety Precautions” on page 48
“Planning the Installation” on page 52
“Installing the Switch in a Rack” on page 55
“Installing an Optional Expansion or Stacking Module” on page58
“Installing an Optional SFP Transceiver” on page 62
“Powering on an AC Powered Switch” on page 68
“Wiring and Powering on an DC Powered Unit” on page70
“Warranty Registration” on page 75
To install an optional redundant power supply, refer to the
48
Please review the following safety precautions before you begin to install
The indicates that a translation of the safety statement is
available in a PDF document titled “Translated Safety Statements”
www.alliedtelesis.com.
Warning: To prevent electric shock, do not remove the cover.
No user-serviceable parts inside. This unit contains hazardous
voltages and should only be opened by a trained and qualified
technician. To avoid the possibility of electric shock, disconnect
electric power to the product before connecting or disconnecting
Warning: Do not work on equipment or cables during periods of
Warning: Power cord is used as a disconnection device. To de-
Warning: Class I Equipment. This equipment must be earthed.
The power plug must be connected to a properly wired earth
ground socket outlet. An improperly wired socket outlet could
place hazardous voltages on accessible metal parts.
E4
Pluggable Equipment. The socket outlet shall be installed near
Caution: Air vents must not be blocked and must have free
Warning: Operating Temperature. This product is designed for a
All Countries: Install product in accordance with local and
AT-8500 Series Layer 2+ Fast Ethernet Switches Installation Guide
Warning: As a safety precaution, install a circuit breaker with a
minimum value of 15 Amps between the equipment and the DC
Always connect the wires to the LAN equipment first before you
connect the wires to the circuit breaker. Do not work with HOT
feeds to avoid the danger of physical injury from electrical shock.
Always be sure that the circuit breaker is in the OFF position
Warning: Do not strip more than the recommended amount of
wire. Stripping more than the recommended amount can create
a safety hazard by leaving exposed wire on the terminal block
Warning: When installing this equipment, always ensure that
the frame ground connection is installed first and disconnected
Warning: Check to see if there are any exposed copper strands
coming from the installed wire. When this installation is done
correctly there should be no exposed copper wire strands
extending from the terminal block. Any exposed wiring can
conduct harmful levels of electricity to persons touching the
This system works with positive grounded or negative grounded
Circuit Overloading: Consideration should be given to the
connection of the equipment to the supply circuit and the effect
that overloading of circuits might have on overcurrent protection
and supply wiring. Appropriate consideration of equipment
nameplate ratings should be used when addressing this
A tray cable is required to connect the power source if the unit is
powered by centralized DC power. The tray cable must be a UL
listed Type TC tray cable and rated at 600 V and 90 degrees C,
Warning: Mounting of the equipment in the rack should be such
that a hazardous condition is not created due to uneven
50
Warning: This unit might have more than one power source. To
reduce the risk of electric shock, disconnect all power sources
If installed in a closed or multi-unit rack assembly, the operating
ambient temperature of the rack environment may be greater
than the room ambient temperature. Therefore, consideration
should be given to installing the equipment in an environment
compatible with the manufacturer’s maximum rated ambient
Caution: Installation of the equipment in a rack should be such
that the amount of air flow required for safe operation of the
Warning: Reliable earthing of rack-mounted equipment should
be maintained. Particular attention should be given to supply
connections other than direct connections to the branch circuits
Warning: To reduce the risk of electric shock, the PoE ports on
this product must not connect to cabling that is routed outside
AT-8500 Series Layer 2+ Fast Ethernet Switches Installation Guide
Selecting a Site for the Switch
Observe the following requirements when choosing a site for your switch:
If you plan to install the switch in an equipment rack, check to be sure
that the rack is safely secured and that it will not tip over. Devices in a
rack should be installed starting at the bottom, with the heavier devices
If you are installing the switch on a table, be sure that the table is level
The power outlet for the switch should be located near the unit and
The site should provide for easy access to the ports on the front of the
switch. This will make it easy for you to connect and disconnect cables,
To allow proper cooling of the switch, air flow around the unit and
through its vents on the side and rear should be unrestricted.
Do not expose the switch to moisture or water.
Make sure that the site is a dust-free environment.
You should use dedicated power circuits or power conditioners to
supply reliable electrical power to the network devices.
52
Table 10 contains the cabling specifications for the twisted pair ports.
The twisted pair ports on the switch feature auto-MDI/MDI-X. They
configured themselves automatically as MDI or MDI-X when
connected to an end node. This allows you to use a straight-through
twisted pair cable when connecting any type of network device to a
The auto-MDI/MDI-X feature is disabled if you disable Auto-
Negotiation on a port and set a port’s speed and duplex mode
manually using the AT-S62 management software. A port where
Auto-Negotiation has been disabled defaults to MDI-X. Disabling
Auto-Negotiation may require that you manually configure a port’s
The 10/100/1000Base-T ports, Ports 49R and 50R, on the
AT-8550GB and AT-8550SP switches can operate at 1000 Mbps
only when set to Auto-Negotiation, which is the default setting. You
Table 10. Twisted Pair Cabling and Distances
Maximum
Distance
AT-8524POE
AT-8550SP
100-ohm shielded or
cable
100 MbpsCategory 5 or Category
100-ohm shielded or
cable
AT-8550GB
(Ports 49R
1000 MbpsCategory 5 and
(Enhanced) 100-ohm
twisted pair cable
AT-8500 Series Layer 2+ Fast Ethernet Switches Installation Guide
Table 11 contains the cabling specifications for the fiber optic ports on an
For cabling specifications for an optional GBIC module, SFP
module, expansion module, or stacking module, refer to the
Table 11. Fiber Optic Cabling and Distances
Maximum
Distance
micron (core/cladding)
cable
mode: 2 km
Half-duplex
(1,360 ft)
54
To unpack the switch, perform the following procedure:
1.Remove all components from the shipping package.
Store the packaging material in a safe location. You must use the
original shipping material if you need to return the unit to Allied
2.Place the switch on a level, secure surface.
3.Make sure the following hardware components are included in your
switch package. If any item is missing or damaged, contact your Allied
One AT-8500 Series Fast Ethernet Switch
Eight flathead Phillips screws (All models except the AT-8524POE
Twelve flathead Phillips screws (AT-8524POE switch only)
AC power cord (AC switches only; Americas, EC, Australia, and
Management cable for local management
Warranty card
AT-8500 Series Layer 2+ Fast Ethernet Switches Installation Guide
Installing the Switch in a Rack
The switch is shipped with two brackets for mounting the unit in a rack.
The brackets can be attached to the chassis four ways. You can install the
chassis so that it is flush with the front of the rack or so that it extends
forward from the rack. Figure 12 illustrates the different ways that you can
install the brackets and how much the chassis extends from the front of the
Method A - Flush with front of rack
Method C - 18.4 cm (7.25 in.)
Figure 12. Rack Mount Bracket Positions
The AT-8524POE switch only supports Method A.
Perform the following procedure to install the switch in a standard 19-inch
rack. If you are not installing the switch in a rack, proceed to “Installing an
1.Place the unit upside down on a level, secure surface.
18 20 22 24
100
ACT
Mcculloch Mac Rt 15 Manual Free
RPS
PWR
AT-8524M
17 19 21 23
COL
FULL
FAULT
MASTER
MODE STATUS
Fast Ethernet Switch
18 20 22 24
100
ACT
RPS
PWR
AT-8524M
17 19 21 23
COL
FULL
FAULT
MASTER
MODE STATUS
Fast Ethernet Switch
CD
56
2.Using a flat-head screwdriver, remove the snap-on plastic feet from
Figure 13. Removing the Feet
4.Attach a rackmounting bracket to one side of the switch using four of
the screws that came with the switch. You can install the brackets in
5.Install the second rackmounting bracket on the other side of the switch
6.Mount the switch in the 19-inch rack using standard screws (not
Warning: To prevent electric shock, do not remove the cover.
No user-serviceable parts inside. This unit contains hazardous
voltages and should only be opened by a trained and qualified
technician. To avoid the possibility of electric shock, disconnect
electric power to the product before connecting or disconnecting
Warning: Do not work on equipment or cables during periods of
Warning: Power cord is used as a disconnection device. To de-
Warning: Class I Equipment. This equipment must be earthed.
The power plug must be connected to a properly wired earth
ground socket outlet. An improperly wired socket outlet could
place hazardous voltages on accessible metal parts.
E4
Pluggable Equipment. The socket outlet shall be installed near
AT-8500 Series Layer 2+ Fast Ethernet Switches Installation Guide
Caution: Air vents must not be blocked and must have free
Warning: Operating Temperature. This product is designed for a
Circuit Overloading: Consideration should be given to the
connection of the equipment to the supply circuit and the effect
that overloading of circuits might have on overcurrent protection
and supply wiring. Appropriate consideration of equipment
nameplate ratings should be used when addressing this
Warning: Mounting of the equipment in the rack should be such
that a hazardous condition is not created due to uneven
If installed in a closed or multi-unit rack assembly, the operating
ambient temperature of the rack environment may be greater
than the room ambient temperature. Therefore, consideration
should be given to installing the equipment in an environment
compatible with the manufacturer’s maximum rated ambient
Caution: Installation of the equipment in a rack should be such
that the amount of air flow required for safe operation of the
Warning: Reliable earthing of rack-mounted equipment should
be maintained. Particular attention should be given to supply
connections other than direct connections to the branch circuits
58
Installing an Optional Expansion or Stacking Module
This section describes how to install an optional expansion or stacking
module in the switch and applies to the AT-8516F/SC, AT-8524M, and
The modules can be hot-swapped; you do not have to power off a
To install a module, perform the following procedure:
1.Remove the module from its shipping container and store the
You must use the original shipping material if you need to return the
An expansion or stacking module can be damaged by static
electricity. Be sure to observe all standard electrostatic discharge
(ESD) precautions, such as wearing an antistatic wrist strap, to
Refer to the module’s installation guide for a list of the items included
with the option. If any item is missing or damaged, contact your Allied
2.Locate the expansion slots on the left side of switch.
3.Using a Phillips screwdriver, loosen the captive screws on the
Figure 14. Removing the Expansion Slot Faceplate
AT-8500 Series Layer 2+ Fast Ethernet Switches Installation Guide
4.Pull the faceplate straight out of the slot.
5.Keep the faceplate in a safe area in case you need to reinstall it.
The faceplate keeps any dust from getting into the switch and
maintains proper airflow if the slot remains empty.
6.Carefully slide the module into the slot until the module faceplate
makes contact with the switch, as shown in Figure 15.
Figure 15. Installing a Module
7.Using a Phillips screwdriver, tighten the captive screws, as shown in
Figure 16. Securing the Module in the Expansion Slot
Always use the captive screws to secure the module to the switch.
Leaving a module partially seated may cause the system to halt and
When you remove a module, store the device in an antistatic bag or
AT-A46
100
ACTIVITY
AT-A46
100
ACTIVITY
60
To install an optional GBIC in an AT-8550GB switch, perform the following
A GBIC can be hot-swapped; you do not have to power off a switch
1.Remove the GBIC from its shipping container and store the packaging
You must use the original shipping material if you need to return the
A GBIC can be damaged by static electricity. Be sure to observe all
standard electrostatic discharge (ESD) precautions, such as
wearing an antistatic wrist strap, to avoid damaging the module.
2.Check that the GBIC package includes all the items listed below.
If any item is missing or damaged, contact your Allied Telesis sales
One GBIC module
Warranty card
For fiber optic cabling specifications, refer to the GBIC installation
3.Follow these guidelines to ensure proper performance of your GBIC:
GBIC modules are dust sensitive. When the GBIC is stored or
when a fiber-optic cable is not plugged in, always keep plugs in the
The most common source of contaminants in the optical bore is
debris picked up on the ferrules of the optical connectors, as
shown in Figure 17. Use an alcohol swab or wipe to clean the
AT-8500 Series Layer 2+ Fast Ethernet Switches Installation Guide
ferrules of the optical connector.
Figure 17. Optical Bore and Ferrule of GBIC Module
Unnecessary removal and insertion of a GBIC can lead to premature
4.Slide the GBIC module, with the label side up, into an expansion slot
The GBIC can be installed in either slot. The GBIC module is seated in
Figure 18. Installing a GBIC Module
5.If you purchased two GBIC modules for the switch, repeat this
Unnecessary removal and insertion of a GBIC can lead to premature
Bore
LINK
MODE LINK50R
49
1000BASE-X
62
To install an optional SFP transceiver in an AT-8550SP switch, perform
An SFP transceiver can be hot-swapped; you do not have to power
1.Unpack the SFP transceiver from its shipping container and store the
You must use the original shipping material if you need to return the
An SFP transceiver can be damaged by static electricity. Be sure to
observe all standard electrostatic discharge (ESD) precautions,
such as wearing an antistatic wrist strap, to avoid damaging the
2.Check that the SFP transceiver includes the items listed below. If any
item is missing or damaged, contact your Allied Telesis sales
One SFP module
Warranty card
For fiber optic cabling specifications, refer to the SFP installation
3.Follow these guidelines to ensure proper performance of your SFP
SFP transceivers are static sensitive. To prevent Electrostatic
Discharge (ESD) damage, follow your normal board and
SFP transceivers are dust sensitive. Do not remove the dust cover
from the port until you are ready to attach the fiber optic cable.
The most common source of contaminants in the optical bore is
AT-8500 Series Layer 2+ Fast Ethernet Switches Installation Guide
debris picked up on the ferrules of the optical connectors. Use an
alcohol swab or wipe to clean the ferrules of the optical connector.
Unnecessary removal and insertion of an SFP transceiver can lead
4.Remove the dust plug from the SFP slot.
5.Locate the label on the transceiver and turn it so that the label is on top
6.Slide the SFP transceiver into an SFP slot on the switch.
The SFP module can be installed in either slot. The SFP module is
SFP transceivers are dust sensitive. When a fiber optic cable is not
installed, or when you store the SFP, always keep the plug in the
slot. When you do remove the plug, keep it for future use.
Unnecessary removal and insertion of an SFP transceiver can lead
7.If you purchased two SFP transceivers for the switch, repeat this
For information about cabling for the SFP transceiver, consult the
64
To connect the data cables to the switch ports and to apply power to the
Cabling Twisted
If your AT-8500 Series switch has twisted pair ports, perform the following
1.Connect the twisted pair data cables to the RJ-45 ports on the switch,
Figure 19. Connecting the Twisted Pair Data Cables
When you connect a twisted pair cable to a port, observe the following
An RJ-45 connector should fit snugly into the port on the switch.
The tab on the connector should lock the connector into place.
Because the ports on the switch are auto-MDI/MDI-X, you can use
either a straight-through or crossover twisted pair cable to connect
any type of network device to a port on the switch. If you disable
Auto-Negotiation on a port, the auto-MDI/MDI-X feature is disabled
and the port defaults to MDI-X. For instructions on how to
configure a port, refer to the AT-S62 Management Software User’s
If your network topology will contain a loop where two or more
network devices can communicate with each other over more than
one data path, do not connect the network cables forming the loop
until after you have activated a spanning tree protocol on the
switch. Data loops can adversely affect network performance. For
information on spanning tree, refer to the AT-S62 Management
If you are creating a port trunk, do not connect the cables of the
trunk to the switch until you after have configured the trunk using
the switch’s management software. Connecting the trunk cables to
the switch before you have configured the software will result in a
data loop, which can adversely affect network performance. For
246
AT-8500 Series Layer 2+ Fast Ethernet Switches Installation Guide
instructions on how to configure a port trunk, refer to the AT-S62
When you connect a device to a port on an AT-8524POE switch,
the port automatically determines whether the node is a powered
device and, if it is, the amount of wattage required by the device,
up to a maximum of 15.4 W. If the node is not a powered device,
To reduce the risk of electric shock, the PoE ports on this product
must not connect to cabling that is routed outside the building where
Cabling Fiber
If your switch has fiber optic ports, perform the following procedure:
1.Remove the dust covers from the ports, as shown in Figure 20.
Figure 20. Removing the Dust Covers from the Fiber Optic Ports
Do not remove the dust covers if you do not intend to connect the
fiber optic cables at this time. Dust contamination can adversely
D/C
D/C
TX
1
9
66
2.Attach the fiber optic data cables to the fiber optic ports, as shown in
Figure 21. Attaching a Fiber Optic Cable
When you attach a fiber optic cable, be sure to observe the following
Be sure that the cable connector is firmly locked into place in the
A dual SC port consists of two separate connectors, as shown in
Figure 22. Each connects to a separate fiber strand. One is for
receiving packets and the other is for transmitting packets. When
you connect a fiber optic cable to a dual SC port, be sure that the
receiver fiber connector is connected to the transmitter connector
on the remote end node, and the transmitter fiber connector is
connected to the receiver connector on the remote node.
You should verify that you are using the appropriate type of fiber
optic cabling. For an AT-8516F/xx Series switch, refer to “Planning
the Installation” on page 52. For an optional GBIC module, refer to
the GBIC installation guide. For an optional fiber optic expansion
module, refer to the expansion module installation guide.
You should verify that the operating specifications of the switch’s
fiber optic port are compatible with the fiber optic port on the
D/C
D/C
TX
1
9
1TX RX
Transmitter
Connector
Fiber
AT-8500 Series Layer 2+ Fast Ethernet Switches Installation Guide
remote end node. For example, you cannot connect a fiber optic
port with a maximum distance of 2 kilometers and an operating
wavelength of 1310 nm to another fiber optic port that has a
maximum distance of 40 kilometers (24.8 miles) and an operating
wavelength of 1550 nm. For fiber optic ports specifications, refer to
“AT-8516F/SC Fiber Optic Port Specifications” on page 85.
If your network topology will contain a loop where two or more
network devices can communicate with each other over more than
one data path, do not connect the network cables forming the loop
until after you have activated a spanning tree protocol on the
switch. Data loops can adversely affect network performance. For
information on spanning tree, refer to the AT-S62 Management
If you are creating a port trunk, do not connect the cables of the
trunk to the switch until you after have configured the trunk using
the switch’s management software. Connecting the trunk cables to
the switch before you have configured the software will result in a
data loop, which can adversely affect network performance. For
instructions on how to configure a port trunk, refer to the AT-S62
Cabling
Modules
If you installed a fiber optic or twisted pair expansion module, stacking
module, GBIC module, or SFP module, connect the data cable to the port
68
To power on an AC powered switch, perform the following procedure:
If you are installing a DC powered switch, go to “Wiring and
1.Select the correct power cord for your country.
2.Plug the power cord into the AC power connector on the back panel of
The power cord is used as a disconnection device. To de-energize
Figure 23. Connecting the AC Power Cord
3.Plug the other end of the power cord into a wall outlet.
When power is applied, the switch begins to load the AT-S62 software.
The loading process takes approximately 20 to 30 seconds to complete.
AT-8500 Series Layer 2+ Fast Ethernet Switches Installation Guide
4.If you installed an optional redundant power supply unit, connect one
end of the DC power cord included with the RPS unit to the back panel
of the redundant power supply and the other end to the RPS connector
on the back panel of the switch, as shown in Figure 24.
5.Verify that the PWR LED on the front of the unit is green. If the PWR
LED is OFF, refer to Chapter 3, “Troubleshooting” on page 77.
The switch runs a series of self-diagnostic tests, which take a few
seconds to perform. After the self tests are complete, the switch is
This unit might have more than one power cord. To reduce the risk
of electric shock, disconnect all power cords before servicing the
No further installation steps are required if you do not intend to change
the default operating parameter settings of the switch, which are listed
in the AT-S62 Management Software User’s Guide. However, if you
want to manage the switch, refer to “Starting a Local Management
70
To provide power for a DC powered switch, perform the following steps:
1.Before you attach wires to the DC terminal block at the rear of the
As a safety precaution, install a circuit breaker with a minimum value
of 15 Amps between the equipment and the DC power source.
Always connect the wires to the LAN equipment first before you
connect the wires to the circuit breaker. Do not work with HOT feeds
to avoid the danger of physical injury from electrical shock. Always
be sure that the circuit breaker is in the OFF position before
A tray cable is required to connect the power source if the unit is
powered by centralized DC power. The tray cable must be a UL
listed Type TC tray cable and rated at 600 V and 90 degrees C, with
2.On the rear side of the chassis is a DC terminal block. Starting from
the left side of the terminal block, identify the positive, frameground,
and negative terminals using the symbols beneath the terminal block
Figure 25. Positive, Ground, and Negative Terminals
3.With a 14-gauge wire-stripping tool, strip the three wires in the tray
cable coming from the DC input power source to 8mm ± 1mm (0.31 in.,
FOR CENTRALIZED DC
INSTALL ONLY IN A
DC INPUT
Positive Ground Negative
AT-8500 Series Layer 2+ Fast Ethernet Switches Installation Guide
Do not strip more than the recommended amount of wire. (See
Figure 26.) Stripping more than the recommended amount can
create a safety hazard by leaving exposed wire on the terminal block
Figure 26. Stripped Wire
4.Connect the frame ground wire to the terminal marked with the
ground symbol by inserting the wire into the terminal and tightening the
connection with a flathead screwdriver, as shown in Figure 27.
When installing this equipment, always ensure that the frame ground
connection is installed first and disconnected last. E11
5.Connect the positive feed wire to the terminal block marked (+).
6.Connect the negative feed wire to the terminal block marked (-).
Check to see if there are any exposed copper strands coming from
the installed wires. When this installation is done correctly there
should be no exposed copper wire strands extending from the
terminal block. Any exposed wiring can conduct harmful levels of
8mm ±1mm
451
452
72
7.Secure the tray supply cable near the rack framework using multiple
cable ties to minimize the chance of the connections being disturbed
by casual contact with the wiring. Use at least four cable ties
separated four inches apart with the first one located within six inches
This system works with a positive grounded or negative grounded
8.Ensure that the circuit breaker is in the Off position.
9.Connect the DC wires to the circuit breaker. (Refer “Power
Specifications” on page 82 for power requirements.)
11.Verify that the PWR LED on the front of the unit is green. If the PWR
LED is OFF, refer to Chapter 3, “Troubleshooting” on page 77.
The switch runs a series of self-diagnostic tests, which take a few
seconds to perform. After the self tests are complete, the switch is
This unit might have more than one power cord. To reduce the risk
of electric shock, disconnect all power cords before servicing the
No further installation steps are required if you do not intend to change
the default operating parameter settings of the switch, which are listed
in the AT-S62 Management Software User’s Guide. However, if you
want to manage the switch, refer to “Starting a Local Management
AT-8500 Series Layer 2+ Fast Ethernet Switches Installation Guide
Starting a Local Management Session
The procedure in this section explains how to start a local (out-of-band)
management session using the RS-232 terminal port on the switch. You
can use a local management session to configure the switch’s operating
parameters and view performance and error statistics.
If you already installed an AT-8500 Series Switch, AT-8400 Series
Switch, or AT-8000 Series Switch on your network and configured it
as a Master switch of an enhanced stack, you can begin to remotely
manage the new switch you have just installed by connecting, locally
or remotely, to the Master switch and then using the enhanced
stacking feature to access the new switch. For instructions, refer to
To start a local management session, perform the following procedure:
1.Connect one end of the RS-232, straight-through management cable
included with the AT-8500 Series switch to the RS-232 terminal port on
the switch. (See Figure 28.) This port is located on the front panel on
the AT-8516F/SC, AT-8524M, and AT-8524POE switches and on the
back panel of the AT-8550GB and AT-8550SP switches.
Figure 28. Connecting an RS-232 Cable to the RS-232 Terminal Port on
2.Connect the other end of the cable to an RS-232 port on a terminal or
a personal computer with a terminal emulation program.
3.Set the terminal or the terminal emulation program to the following
Baud rate: 9600 bps
RPS
PWR
AT-8524M
COL
FULL
MODE
74
Stop bits: 1
The port settings are for a DEC VT100 or ANSI terminal, or an
When you reset or power cycle the switch during a local
management session, you will see the following prompt: Press
<CTRL>B to go to Boot Prompt. This message is intended for
manufacturing purposes only. If you inadvertently display the boot
prompt (=>), type boot and press Return to start the switch.
You are prompted for a user name and password.
5.To view and configure all of the switch’s operating parameters, enter
the login name “manager”. The default password for manager access
is “friend”. To only view the parameter settings, enter the login name
“operator”. The default password for operator access is “operator”. The
The Main Menu is displayed.
If you logged in with manager access, you can now fully manage the
switch using the management interface. For instructions, refer to the
AT-S62 Management Software User’s Guides. The guides are
available from the Allied Telesis web site at www.alliedtelesis.com and
AT-8500 Series Layer 2+ Fast Ethernet Switches Installation Guide
Warranty Registration
When you have finished installing the switch, fill out the enclosed warranty
76
Chapter 3
This chapter contains information on how to troubleshoot the switch in the
If after following the instructions in this chapter you are unable to
resolve the problem, contact Allied Telesis Technical Support for
assistance. Refer to “Contacting Allied Telesis” on page14 for
PWR LED is Off
Check the PWR LED on the front of the switch. If the LED is OFF,
indicating that the unit is not receiving power, do the following:
Make sure that the power cord is securely connected to the power
source and to the AC connector on the back panel of the switch.
Verify that the power outlet has power by connecting another device to
Try connecting the unit to another power source.
Check that the voltage from the power source is within the required
Twisted Pair Port Link LED is Off
For twisted pair ports, verify that the LINK LED for each port is ON. If a
Verify that the end node connected to the port is powered ON and is
Check that the twisted pair cable is securely connected to the port on
Make sure that the twisted pair cable does not exceed 100 m
78
Verify that you are using the appropriate category of twisted pair cable:
Category 3 or better for 10 Mbps operation and Category 5 and
Category 5E for 100 Mbps and 1000 Mbps operations.
Determine if a crossover cable is required. Since the twisted pair ports
feature auto MDI/MDI-X, you should be able to use a straight-through
cable regardless of the type of device you connect to a port. However,
if you disable Auto-Negotiation on a port and set a port’s speed and
duplex mode manually, the port defaults to MDI-X. For port pinouts,
refer to “RJ-45 Twisted Pair Port Pinouts” on page 83.
Make sure that the operating parameters of the port on the switch are
compatible with the end node to which the port is connected. This may
require that you use the switch’s management software. For
instructions, refer to the AT-S62 Management Software User’s Guides.
For fiber optic ports, verify that the LINK LED for each port is ON. If a LINK
Verify that the end node connected to the port is powered ON and is
Check that the fiber optic cable is securely connected to the port on
Dual SC ports consist of two separate connectors, as shown in Figure
32 on page 90. Each connects to a separate fiber strand. One is for
receiving data and the other is for transmitting data. When connecting
a fiber optic cable to an SC port, be sure that the receiver fiber
connector is connected to the transmitter connector on the remote end
node, and the transmitter fiber connector is connected to the receiver
Make sure that you are using the appropriate type of fiber optic cable
and that the cable length does not exceed the allowed maximum
distance. For an AT-8516F Series switch, refer to “Planning the
Installation” on page 52 . For an optional GBIC or SPF module, or
other expansion module, refer to the Installation Guide shipped with
Use a fiber optic tester to test the attenuation on the cable to
determine if the strength of the fiber optic signal falls below acceptable
limits. (For fiber optic port specifications for an AT-8516F Series
Switch, refer to “AT-8516F/SC Fiber Optic Port Specifications” on
page 85. For an optional GBIC or SPF module, or other expansion
module, refer to the Installation Guide shipped with the module.
Check that the operating specifications (for instance, wavelength and
maximum operating distance) of the fiber optic port on the remote end
node are compatible with the fiber optic port on the switch. For
AT-8500 Series Layer 2+ Fast Ethernet Switches Installation Guide
example, you cannot connect a fiber optic port with a maximum
distance of 40 kilometers (24.8 miles) and an operating wavelength of
1550 nm to a remote fiber optic port with an maximum distance of only
2 kilometers (1.24 miles) and a wavelength of 1310 nm.
Check to be sure that the fiber optic ports on the switch and on the end
node are operating at the same speed and duplex mode.
AT-8550GB and AT-8550SP switches only — Verify that the GBIC
module or SFP module is completely inserted into the expansion slot
A 1000Base connection can take from five to ten seconds to
PoE Device is Not Receiving Power
If you attached a powered device to a port on an AT-8524POE, the PoE
LED for the port should be green. (Remember to use the Mode Select
button to toggle the Mode LEDs to the PoE state.) If the device is not
receiving power or the PoE LED is flashing amber, steady amber, or is
Check to be sure that the powered device is designed to receive power
over pins 1, 2, 3, and 6 on the RJ-45 port. This can be verified by
reviewing the device’s documentation or data sheet.
Check that the device’s power requirements do not exceed 15.4 W.
This can be verified by reviewing the device’s documentation or data
Verify that the twisted pair cable is Category 5 or 5E.
Verify that the twisted pair cable is not faulty.
Use the AT-S62 management software to determine whether PoE is
enabled on the switch and the port. The default setting for PoE is
Use the management software to determine whether the PoE power
setting for the port has been reduced from the default setting of 15.4
W, to a value below the power requirements of the device.
Verify that the power budget on the switch is not being exceeded by
the powered devices. This should not be a problem for the
AT-8524POE switch, which can support powered devices on all ports 1
to 24, even when all devices require the maximum of 15.4 W.
80
Check the FAULT LED. During normal operations, the LED remains off,
except for periods when the management software is saving a change to
its configuration. If it remains on for an extended period, do the following:
Try resetting the switch by disconnecting and reconnecting the AC
power cord. If the switch is a DC model, reset the unit by powering off
If the FAULT LED remains ON, try downloading a new version of the
switch’s management software through the RS-232 terminal port on
the front panel of the switch. For instructions, refer to the switch’s
If the LED remains on even after you have tried the above
suggestions, the switch may be having a hardware problem. Contact
your Allied Telesis representative for assistance.
If you are unable to establish a local management session with the switch
through the RS-232 terminal port on the front panel, do the following:
Check to be sure that the RS-232 cable is securely connected to the
RS-232 terminal port on the switch and to the RS-232 port on the
Check to be sure that you are using a straight-through RS-232 cable.
Check to be sure that the operating parameters on the terminal or the
terminal emulation program, if you are using a personal computer,
have been set correctly. The default settings for “Planning the
Installation” on page 52the RS-232 terminal port can be found in. See
Appendix A
Physical Specifications
AT-8516F/SC and AT-8524M 4.4 cm x 44.0 cm x 22.2 cm
(H x W x D)
AT-8550GB and AT-8550SP 4.4 cm x 44.0 cm x 25.5 cm
(H x W x D)
(1.75 in. x 17.25 in. x 16.0 in.)
Weight:
AT-8524M3.2 kg (7.1 lb.)
AT-8550GB3.6 kg (7.9 lb.)
Recommended Minimum
Environmental Specifications
Operating Temperature:0° C to 40° C (32° F to 104° F)
Storage Temperature:-25° C to 70° C (-13° F to 158° F)
Storage Humidity:5% to 95% non-condensing
Maximum Non-operating Altitude:4,000 m (13,000 ft)
82
Input Voltage:
AC100-240 VAC, 2A Max, 50/60 Hz
AT-8524POE:
AC Input Power Consumption:
Only the AT-8524POE:450 watts
IEEE 802.3af Class 3 (15.4 W): Max 24 ports
IEEE 802.3af Mode: Alternative A (MDI)
Safety and Electromagnetic Emissions Certifications
VCCI Class A, C-TICK,
Immunity: EN55024
(TUV)
MTTR < 1/2 hr
AT-8500 Series Layer 2+ Fast Ethernet Switches Installation Guide
RJ-45 Twisted Pair Port Pinouts
Figure 29 illustrates the pin layout for an RJ-45 connector and port.
Table 12 lists the RJ-45 pin signals for the 10/100Base-TX ports on the
Table13 lists the RJ-45 port pin signals on the 10/100Base-TX ports on an
Pin 1
Table 12. 10/100Base-TX Port MDI/MDI-X Pin Signals
Signal
2TX- RX-
4 UnusedUnused
6RX- TX-
8 UnusedUnused
Table 13. 10/100Base-T Port MDI/MDI-X Pin Signals with PoE
1TX+ and Vport-11RX+ and Vport-1
3RX+ and Vport-22TX+ and Vport-2
84
Table 14 lists the RJ-45 pin signals for the two 10/100/1000-Base-T ports
on the AT-8550GB switch when the ports are operating at 1000 Mbps.
5 UnusedUnused
7 UnusedUnused
1.Vport-1 can be positive (+) or negative (-), depend-
ing on the requirements of the powered device con-
2.Vport-2 can be positive (+) or negative (-), depend-
ing on the requirements of the powered device con-
nected to a port. If Vport-1 is positive, then Vport-2
will be negative. If Vport-1 is negative, then Vport-2
Table 14. MDI and MDI-X Pin Signals (1000Base-T)
PinoutPairPinout Pair
2Pair 1 -2Pair 2 -
4Pair 3 +4Pair 4 +
6Pair 2 -6Pair 1 -
8Pair 4 -8Pair 3 -
Table 13. 10/100Base-T Port MDI/MDI-X Pin Signals with PoE
Mcculloch Mac Rt 15 Manual 2016
AT-8500 Series Layer 2+ Fast Ethernet Switches Installation Guide
AT-8516F/SC Fiber Optic Port Specifications
Speed:100 Mbps
Distance:2 km (1.24 mi)
AT-8516F/SCDual SC Connector
(core/cladding) multimode fiber optic
Operating Wavelength:1310 nm
50/125 micron cabling
Maximum: -14 dBm average
Minimum: -19 dBm average
Receiver Sensitivity:
Maximum:-14 dBm average
86
Table 15 lists the pin signals on the RS-232 terminal port.
Pin Signal
2Transmit Data
4Data Set Ready
Mcculloch Mac 3200 Chainsaw Manual
6Data Terminal Ready
8Request to Send
AT-8500 Series Layer 2+ Fast Ethernet Switches Installation Guide
RPS Connector Port Pinouts
Figure 30 illustrates the pin layout to the 16-pin molex connector and RPS
port on the AT-8516F/SC, AT-8524M, AT-8550GB, and AT-8550SP
Figure 30. RPS 16-pin Molex Connector Pin Layout
Table 16 lists the 16-pin RPS connector pins and definitions.
8
1
116
Table 16. Pin Definitions of the 16-pin RPS Connector
1+5V DC
3RS -3.3 V DC
5Redundant Power Supply (RPS) present
7+3.3V DC Return
9 +5V DC Return
11+2.5 DC Return
13+2.5V DC Return
15+3.3V DC
88
Mcculloch Mac Rt 15 Manual Review
Figure 31 illustrates the pin layout to the RPS connector on the
Figure 31. AT-8524POE RPS Connector Pin Layout
Table 17 lists the RPS connector pins and definitions.
Table 16. Pin Definitions of the 16-pin RPS Connector (Continued)
A1A2 17
Table 17. Pin Definitions for the RPS Connector on the AT-8524POE
Pin Definition
A2 Return
248V RS+
412V RS-
6 12V
8 48V
1048V RS-
123.3V RS-
AT-8500 Series Layer 2+ Fast Ethernet Switches Installation Guide
133.3V RS+
15 3.3V
Table 17. Pin Definitions for the RPS Connector on the AT-8524POE
Pin Definition
90
A dual SC type connector, as shown in Figure 32, is used with the
Figure 32. Dual SC Connector