Allied Telesis AT-GS924M User Manual

AT-GS908M
AT-GS916M
AT-GS924M

Gigabit Ethernet Switches

Installation Guide

613-001986 Rev A

Copyright © 2014 Allied Telesis, Inc.

All rights reserved. No part of this publication may be reproduced without prior written permission from Allied Telesis,
Inc.

Allied Telesis and the Allied Telesis logo are trademarks of Allied Telesis, Incorporated. 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 such damages.

Electrical Safety and Emissions Standards

This product meets the following standards.

U.S. Federal Communications Commission

Radiated Energy

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
this equipment.

Industry Canada

This Class A digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations.
Cet appareil numérique de la classe A respecte toutes les exigences du Règlement sur le matériel brouilleur du Canada.

RFI Emissions FCC Class A, EN55022 Class A, EN61000-3-2, EN61000-3-3, RCM, CE

Warning: In a domestic environment this product may cause radio interference in
which case the user may be required to take adequate measures.

Immunity EN55024
Electrical Safety EN60950-1 (ULEU), UL 60950-1 (

CULUS

)

Laser Safety EN60825

3

Translated Safety Statements

Important: The  indicates that a translation of the safety statement is available in a PDF
document titled Translated Safety Statements posted on the Allied Telesis website at
www.alliedtelesis.com/support.

4

Contents

Preface ................................................................................................................................................................................11

Symbol Conventions..................................... ....................................... ... ... ................................................ 12

Contacting Allied Telesis............................................................................................................................ 13

Chapter 1: Overview ...................................................................................................................................... 15

Features..................................................................................................................................................... 16

Twisted-Pair Ports.................. ....................................... ... ... ....................................... ... ... ................... 16

SFP Slots............................................................................................................................................. 16

LEDs.................................................................................................................................................... 17

Installation Options.............................................................................................................................. 17

MAC Address Table ............................................................................................................................ 17

Front and Back Panels............................................................................................................................... 18

Management Software............................................................................................................................... 20

Twisted-Pair Ports .. ... .... ... ... ... .... ...................................... .... ... ....................................... ............................ 21

Combo Ports.............................................................................................................................................. 22

LEDs .......................................................................................................................................................... 23

STATUS LEDs..................................................................................................................................... 23

MODE LEDs........................................................................................................................................ 24

Port LEDs ............... ... ... ... .... ... ... ... ....................................... ... .... ......................................................... 25

SFP Slot LEDs..................................................................................................................................... 26

Reset Button .............................................................................................................................................. 28

Mode Button.. ... ....................................... ... ... ....................................... ... ... ................................................ 29

Power Supply............................................................................................................................................. 30

Chapter 2: Installation ................................................................................................................................... 31

Reviewing Safety Precautions ................................................................................................................... 32

Selecting a Site for the Switch ................................................................................................................... 35

Cable Specifications................................................................................................................................... 36

Unpacking the Switch................................................................................................................................. 37

Installing the Power Cord Retaining Clip.................................................................................................... 39

Installing the Switch on a Desktop or Table............................................................................................... 40

Installing the Switch in an Equipment Rack............................................................................................... 41

Installing SFP Transceivers ....................................................................................................................... 43

Cabling the Switch ..................................................................................................................................... 46

Powering On the Switch............................................................................................................................. 47

Chapter 3: Troubleshooting ......................................................................................................................... 49

Appendix A: Technical Specifications ........................................................................................................ 51

Physical Specifications............................................................................................................................... 51

Dimensions.......................................................................................................................................... 51

Weight ................................................................................................................................................. 51

Environmental Specifications..... ... ....................................... ... ... ....................................... ... ... ................... 52

Power Specifications.................................................................................................................................. 52

Safety and Electromagnetic Emissions Certifications................................................................................ 52

Connectors and Port Pinouts..................................................................................................................... 53

5

Contents

6

Figures

Figure 1: AT-GS908M, AT-GS916M, and AT-GS924M Front Panels................................................................................. 18

Figure 2: AT-GS908M, AT-GS916M, and AT-GS924M Back Panels.................................................................................. 19

Figure 3: STATUS LEDs...................................................................................................................................................... 23

Figure 4: MODE LEDs......................................................................................................................................................... 25

Figure 5: Port LEDs............................................................................................................................................................. 25

Figure 6: SFP Slot LEDs ..................................................................................................................................................... 26

Figure 7: Shipping Package Contents................................................................................................................................. 38

Figure 8: Power Cord Retaining Clip................................................................................................................................... 39

Figure 9: Inserting the Retaining Clip into the Retaining Bracket ........................................................................................ 39

Figure 10: Attaching the Rack-Mount Brackets to the Switch.............................................................................................. 41

Figure 11: Mounting the Switch in an Equipment Rack....................................................................................................... 42

Figure 12: Removing the Dust Plug from an SFP Slot ........................................................................................................ 43

Figure 13: Inserting the SFP................................................................................................................................................ 44

Figure 14: Positioning the SFP Handle in the Upright Position ........................................................................................... 44

Figure 15: Plugging in the AC Power Cord.......................................................................................................................... 47

Figure 16: RJ-45 Connector and Port Pin Layout................................................................................................................ 53

7

List of Figures

8

Tables

Table 1. Combo Ports .........................................................................................................................................................22

Table 2. POWER LED Functional Description ....................................................................................................................23

Table 3. FAULT LED Functional Description ......................................................................................................................24

Table 4. STANDBY LED Functional Description ................................................................................................................24

Table 5. MODE LED Functional Descriptions .....................................................................................................................25

Table 6. Port LED Functional Descriptions .........................................................................................................................26

Table 7. SFP Slot LED Functional Descriptions .................................................................................................................27

Table 8. Twisted-Pair Cabling and Distances .....................................................................................................................36

Table 9. Chassis Dimensions .............................................................................................................................................51

Table 10. Chassis Weight ...................................................................................................................................................51

Table 11. Environmental Specifications ..............................................................................................................................52

Table 12. Power Specifications ..........................................................................................................................................52

Table 13. Safety and Electromagnetic Emissions Certifications .........................................................................................52

Table 14. MDI Pin Signals (10Base-T or 100Base-TX) ......................................................................................................53

Table 15. MDI-X Pin Signals (10Base-T or 100Base-TX) ..................................................................................................53

Table 16. RJ-45 1000Base-T Connector Pinouts ...............................................................................................................54

9

List of Tables

10

Preface

This guide contains the installation instructions for the AT-GS908M, AT­GS916M, and AT-GS924M Gigabit Ethernet Switches. This preface
contains the following sections:

 “Symbol Conventions” on page 12
 “Contacting Allied Telesis” on page 13

11

Symbol Conventions

Note

Caution

Warning

Warning

This document uses the following conventions:

Notes provide additional information.

Cautions inform you that performing or omitting a specific action
may result in equipment damage or loss of data.

Warnings inform you that performing or omitting a specific action
may result in bodily injury.

Warnings inform you that an eye and skin hazard exists due to the
presence of a Class 1 laser device.

12

Contacting Allied Telesis

If you need assistance with this product, you may contact Allied Telesis
technical support by going to the Support & Services section of the Allied
Telesis web site at www.alliedtelesis.com/support. You can find links for
the following services on this page:

 24/7 Online Support — Enter our interactive support center to

search for answers to your product questions in our knowledge
database, check support tickets, learn about Return Merchandise
Authorizations (RMAs), and contact Allied Telesis technical
experts.

 USA and EMEA phone support - Select the phone number that

best fits your location and customer type.

 Hardware warranty information - Learn about Allied Telesis

warranties and register your product online.

 Replacement Services — Submit an RMA request via our

interactive support center.

AT-GS908M, AT-GS916M, and AT-GS924M Switches Installation Guide

 Documentation - View the most recent installation guides, user

guides, software release notes, white papers and data sheets for
your product.

 Software Updates - Download the latest software releases for your

product.

For sales or corporate contact information, go to www.alliedtelesis.com/
purchase and select your region.

13

14

Chapter 1

Overview

This chapter provides descriptions of the AT-GS908M, AT-GS916M, and
AT-GS924M Layer 2 Gigabit Ethernet Switches and contains the following
sections:

 “Features” on page 16
 “Front and Back Panels” on page 18
 “Management Software” on page 20
 “Twisted-Pair Ports” on page 21
 “Combo Ports” on page 22
 “LEDs” on page 23
 “Reset Button” on page 28
 “Mode Button” on page 29
 “Power Supply” on page 30

15

Chapter 1: Overview

Note

Note

Note

Features

Here are the hardware features of the AT-GS900M Series Gigabit
Ethernet Switches.

Twisted-Pair

Ports

Here are the basic features of the 10/100/1000 Mbps twisted-pair ports:

 8, 16, or 24 ports per switch
 10Base-TX, 100Base-T and 1000Base-T compliant
 IEEE 802.3u Auto-Negotiation compliant
 Auto-MDI/MDIX
 100 meters (328 feet) maximum operating distance
 IEEE 802.3x Flow Control in 10/100Base-TX full-duplex operation
 IEEE 802.3x Back Pressure in 10/100Base-TX half-duplex

operation

 IEEE803.3z 1000Base-T Flow Control
 RJ-45 connectors

SFP Slots All three switches support both 100Base-FX and 1000Base-SX/LX

transceivers. The switches support slots for SFPs as follows:

 One SFP slot on the AT-GS908 M switch
 Two SFP slots on the AT-GS916M switch
 Four SFP slots on the AT-GS924M switch

16

The AT-GS916M and AT-GS924M SFP slots are paired with
twisted-pair ports on the switch to form combo ports. For more
information, see “Combo Ports” on page 22.

You must purchase SFP transceivers separately. For a list of
supported transceivers, contact your Allied Telesis distributor or
reseller.

See the product data sheets for the specific ATI SFP modules
supported by the AT-GS900M Series switches.

AT-GS908M, AT-GS916M, and AT-GS924M Switches Installation Guide

LEDs The following lists the switch LEDs:

 Power LED; refer to “POWER LED” on page 23.
 Fault LED; refer to “FAULT LED” on page 24.
 Standby LED; refer to“STANDBY LED” on page 24.
 Speed and Duplex Mode LEDs; refer to “MODE LEDs” on page 24.
 Speed/Duplex and Link/Activity LEDs for the twisted-pair ports;

refer to “Port LEDs” on page 25.

 Link/Activity LEDs for the SFP slots; refer to “SFP Slot LEDs” on

page 26.

Installation

Options

MAC Address

Table

The AT-GS900M Series switches can be installed in the following ways:

 Rack mounted in a 19-inch equipment rack
 Mounted on a desk or tabletop

If installing the switch in an equipment rack, rack mounting equipment
provided with the switch depends on the switch model as follows:

 AT-GS908M: rack mounting equipment must be purchased

separately. The rack mounting kit model number is AT-RKMT-J05.

 AT-GS916M and AT-GS924M: rack mounting hardware is included

in the shipping package.

Here are the basic features of the MAC address table:

 Storage capacity up to 8KB MAC address entries
 Automatic learning and aging

17

Chapter 1: Overview

AT-GS924M

AT-GS916M

10/100/1000Base-T
Twisted-Pair Ports

AT-GS908M

Reset Button

Port LEDs

SFP LED

Console Port

Status LEDs

Mode
Button

Mode
LEDs

SFP Slot

10/100/1000Base-T
Twisted-Pair Ports

Reset Button

Port LEDs

SFP LEDs

Console Port

Status LEDs

Mode
Button

Mode
LEDs

10/100/1000Base-T
Twisted-Pair Ports

Reset Button

Port LEDs

SFP LEDs

Console Port

Status LEDs

Mode
Button

Mode
LEDs

SFP Slots

SFP Slots

Front and Back Panels

Figure 1 illustrates the front panels of the AT-GS908M, AT-GS916M, and
AT-GS924M Gigabit Ethernet Switches.

18

Figure 1. AT-GS908M, AT-GS916M, and AT-GS924M Front Panels

AT-GS908M, AT-GS916M, and AT-GS924M Switches Installation Guide

AT-GS924M

AT-GS908M

AC Input

AC Input

AT-GS916M

AC Input

Figure 2 illustrates the back panels of the AT-GS908M, AT-GS916M, and
AT-GS924M switches.

Figure 2. AT-GS908M, AT-GS916M, and AT-GS924M Back Panels

19

Chapter 1: Overview

Management Software

The switches are shipped with the ATPro management software pre­installed. The software provides a web-browser interface for in-band, over­the-network management.

In the unlikely event that the management software becomes corrupted or
damaged on the switch, you can download the software from the Allied
Telesis corporate web site and reinstall it on the switch . For instructions on
how to install new management software, see the product documentation.

 AT-GS900M Series Management Software Web User’s Guide
 AT-GS900M Series Command Line Interface User’s Guide

20

Twisted-Pair Ports

Note

AT-GS908M, AT-GS916M, and AT-GS924M Switches Installation Guide

The AT-GS908M, AT-GS916M, and AT-GS924M Layer 2 Gigabit Ethernet
Switches feature 8, 16, and 24 twisted-pair ports, respectively. All ports
are 10Base-T, 100Base-TX, and 1000Base-TX compliant. You can set the
port speeds and duplex modes either automatically with IEEE 802.3u
Auto-Negotiation or manually with the management software.

The twisted-pair ports feature 8-pin RJ-45 connectors. For the port
pinouts, see “Connectors and Port Pinouts” on page 53.

The ports have a maximum operating distance of 100 m (328 feet). For 10
Mbps operation, the ports require 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 unshielded twisted-pair cabling.

The ports feature auto-MDI, which automatically configures the ports as
MDI or MDI-X. This feature allows you to use straight-through twisted-pair
cables, regardless of the wiring configurations of the ports on the end
nodes.

A switch port connected to an end node that is not using Auto­Negotiation should not use Auto-Negotiation to set the speed and
duplex mode, because a duplex-mode mismatch may occur. In this
case, disable Auto-Negotiation and set the port’s speed and duplex
mode manually.

21

Chapter 1: Overview

Combo Ports

The AT-GS916M Switch has two combo ports, and the AT-GS924M
Switch has four combo ports. Each combo port consists of one 10/100/
1000Base-T twisted-pair port and one slot for an optional 100Base-FX or
1000Base-SX/LX SFP transceiver. The twisted-pair ports are identified
with the letter “R” for “Redundant” on the front faceplates of the units. The
combo ports and slots are listed in Table 1.

Table 1. Combo Ports

Switch Twisted-Pair Port SFP Slot

15R 15

AT-GS916M

16R 16
15R 15

AT-GS924M

16R 16
23R 23
24R 24

The combo ports have the guidelines listed here:

 Only one port in a pair, either the twisted-pair port or a

corresponding SFP module, can be active at a time.

 The twisted-pair port is the active port when its SFP slot is empty,

or when an SFP module is installed, but has not established a link
to an end node.

 The twisted-pair port automatically changes to the redundant

status mode when an SFP module establishes a link with an end
node.

 A twisted-pair port automatically transitions back to the active

status when the link is lost on the SFP module.

 In nearly all cases, a twisted-pair port and an SFP module share

the same configuration settings, including port settings, VLAN
assignments, access control lists, and spanning tree.

 An exception to the shared settings is port speed. If you disable

Auto-Negotiation on a twisted-pair port and set the speed and
duplex mode manually, the speed reverts to Auto-Negotiation
when an SFP module establishes a link with an end node.

22

AT-GS908M, AT-GS916M, and AT-GS924M Switches Installation Guide

STATUS LEDs

Reset Button

LEDs

There are four types of LEDs on the AT-GS900M Series switches:

 “STATUS LEDs”
 “MODE LEDs” on page 24
 “Port LEDs” on page 25
 “SFP Slot LEDs” on page 26

STATUS LEDs STATUS LEDs display the status of the switch.

STATUS LEDs are as follows:

 “POWER LED”
 “FAULT LED” on page 24
 “STANDBY LED” on page 24

The STATUS LEDs are located on the left side of the front panel of the
switch. See Figure 3.

Figure 3. STATUS LEDs

POWER LED

The POWER LED reports the status of AC power.
Table 2 describes the states of the POWER LED.

Table 2. POWER LED Functional Description

State Description

Off Indicates either the switch is not receiving

AC power or the AC input power is operating
outside the normal range.

Steady

Green

The switch is receiving AC input power and is
operating normally.

23

Chapter 1: Overview

Note

FAULT LED

The FAULT LED reports any conditions on the switch that are not normal.
Table 3 describes the states of the FAULT LED.

Table 3. FAULT LED Functional Description

State Description

Off Normal switch operation.

Steady

Abnormal system operation.

Red

Flashing

Red

One of following:

 Firmware downloading and being

written to flash memory.

 DC internal power operating outside

the normal range.

 Temperature out of range.

STANDBY LED

The STANDBY LED indicates whether the power is in a standby state.
Table 4 describes the states of the STANDBY LED.

Table 4. STANDBY LED Functional Description

State Description

Off Power not in standby state.

Steady

Green

Power in standby state.

The management web interface or CLI is used to set the Standby
state.

MODE LEDs The MODE LEDs display which mode is selected on the switch: Speed or

Duplex. The mode is selected using the Mode button, located on the left
side of the front panel of the switch. For a description of the Mode button,
refer to “Mode Button” on page 29.

The MODE LEDs are located on the left side of the front panel of the
switch. See Figure 4 on page 25.

24

AT-GS908M, AT-GS916M, and AT-GS924M Switches Installation Guide

MODE LEDs

Mode Button

Figure 4. MODE LEDs

Table 5 describes the MODE LEDs for the AT-GS900M Series switches.

Table 5. MODE LED Functional Descriptions

LED State Description

SPEED

Steady

Green

Off SPEED is not the selected mode. Ports

SPEED is the selected mode. Ports display
SPEED status.

display DUPLEX status.

DUPLEX

Steady

Green

DUPLEX is the selected mode. Ports display
DUPLEX status.

Off DUPLEX is not the selected mode. Ports

display SPEED status.

Port LEDs The Port LEDs report the link activity and speed status of each 10/100/

1000 BaseT port.
The Port LEDs are shown in Figure 5.

Figure 5. Port LEDs

Table 6 on page 26 describes the Port LEDs for the AT-GS900M Series
switches.

25

Chapter 1: Overview

SFP/Slot LEDs

.

Table 6. Port LED Functional Descriptions

LED State Description

Off The port has not established a link with a

network device.

Link/Activity

On The port has established a link with a

network device.

Flashing

Green

The port is transmitting or receiving
network packets.

Off If SPEED is selected by the Mode

switch, the maximum operating speed of
the port is 10 or 100 Mbps or link not
established.

Steady

Green

Speed/Duplex

If SPEED is selected by the Mode
switch, the maximum operating speed of
the port is 1000 Mbps.

Off If DUPLEX is selected by the Mode

switch, half-duplex link established or link
not established.

Steady

Green

If DUPLEX is selected by the Mode
switch, full-duplex link established.

SFP Slot LEDs The SFP Slot LEDs report the link activity status of each SFP slot.

The AT-GS924M SFP Slot LEDs are shown in Figure 6.

26

Figure 6. SFP Slot LEDs

Table 7 on page 27 describes the SFP Slot LEDs for the AT-GS900M
Series switches.

AT-GS908M, AT-GS916M, and AT-GS924M Switches Installation Guide

.

Table 7. SFP Slot LED Functional Descriptions

LED State Description

Off The port has not established a link with a

network device.

Link/Activity

On The port has established a link with a

network device.

Flashing

Green

The port is transmitting or receiving
network packets.

27

Chapter 1: Overview

Caution

Reset Button

Pressing the Reset button resets your switch.
The Reset button is located next to the STATUS LEDs. See Figure 3 on

page 23.
This initiates a system reboot of the switch and reloads the current

configuration file.

The switch does not forward network traffic during the reset process.

28

Mode Button

AT-GS908M, AT-GS916M, and AT-GS924M Switches Installation Guide

Use the Mode button to select whether the Port LEDs display the Link
Activity or speed and duplex status.

The Mode button is located next to the MODE LEDs. See Figure 4 on
page 25.

29

Chapter 1: Overview

Note

Power Supply

Each switch has an internal power supply with a single AC power supply
socket on the back panel. To power the switch on or off, connect or
disconnect the power cord provided with the switch. A power cord is
supplied with the switch.

For the power requirements, see the “Power Specifications” on
page 52.

30

Chapter 2

Installation

This chapter contains the following sections:

 “Reviewing Safety Precautions” on page 32
 “Selecting a Site for the Switch” on page 35
 “Cable Specifications” on page 36
 “Unpacking the Switch” on page 37
 “Installing the Power Cord Retaining Clip” on page 39
 “Installing the Switch on a Desktop or Table” on page 40
 “Installing the Switch in an Equipment Rack” on page 41
 “Installing SFP Transceivers” on page 43
 “Cabling the Switch” on page 46
 “Powering On the Switch” on page 47

31

Chapter 2: Installation

Note

Warning

Warning

Warning

Warning

Note

Reviewing Safety Precautions

Please review the following safety precautions before you begin to install
the chassis or any of its components.

The  indicates that a translation of the safety statement is
available in a PDF document titled Translated Safety Statements
posted on the Allied Telesis website at www.alliedtelesis.com/
support.

To prevent electric shock, do not remove the cover. No user­serviceable 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 the cables.  E1

Do not work on equipment or cables during periods of lightning
activity.  E2

Power cord is used as a disconnection device. To de-energize
equipment, disconnect the power cord.  E3

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 the
equipment and shall be easily accessible.  E5

32

AT-GS908M, AT-GS916M, and AT-GS924M Switches Installation Guide

Caution

Warning

Note

Note

Warning

Note

Caution

Air vents must not be blocked and must have free access to the
room ambient air for cooling.  E6

Operating Temperature. This product is designed for a maximum
ambient temperature of 50° C.  E57

All Countries: Install product in accordance with local and National
Electrical Codes.  E8

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 over-current protection and
supply wiring. Appropriate consideration of equipment nameplate
ratings should be used when addressing this concern.  E21

Mounting of the equipment in the rack should be such that a
hazardous condition is not created due to uneven mechanical
loading.  E25

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 temperature (Tmra).



E35

Installation of the equipment in a rack should be such that the
amount of air flow required for safe operation of the equipment is not
compromised.  E36

33

Chapter 2: Installation

Warning

Reliable earthing of rack-mounted equipment should be maintaine d.
Particular attention should be given to supply connections other than
direct connections to the branch circuits (for example, use of power
strips).  E37

34

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, verify that the

rack is safely secured and will not tip over. Devices in a rack should
be installed starting at the bottom, with the heavier devices near
the bottom of the rack.

 If you are installing the switch on a table, verify that the table is

level and secure.

 The power outlet for the switch should be located near the unit and

should be easily accessible.

 The site should provide for easy access to the ports on the front of

the switch. This will make it easier for you to connect and
disconnect cables, as well as view the switch’s LEDs.

 Air flow around the unit and through its vents on the side and rear

should not be restricted so that the switch can maintain adequate
cooling.

AT-GS908M, AT-GS916M, and AT-GS924M Switches Installation Guide

 Do not place objects on top of the switch.
 Do not expose the switch to moisture or water.
 Ensure 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.

35

Chapter 2: Installation

Note

Cable Specifications

Table 8 contains the cable specifications for the twisted-pair ports.

Table 8. Twisted-Pair Cabling and Distances

Speed Type of Cable

Maximum
Operating

Distance

10 Mbps Standard TIA/EIA 568-B-compliant

Category 3 or better shielded or
unshielded cabling with 100 ohm
impedance and a frequency of 16
MHz.

100 Mbps Standard TIA/EIA 568-A-compliant

Category 5 or TIA/EIA 568-B­compliant Enhanced Category 5
(Cat 5e) shielded or unshielded
cabling with 100 ohm impedance
and a frequency of 100 MHz.

1000 Mbps Standard TIA/EIA 568-A-compliant

Category 5 or TIA/EIA 568-B­compliant Enhanced Category 5
(Cat 5e) shielded or unshielded
cabling with 100 ohm impedance
and a frequency of 100 MHz.

The twisted-pair ports on the switch feature auto-MDI when
operating at 10, 100, or 1000 Mbps. A port is configured as MDI or
MDI-X when it is connected to an end node. Consequently, you can
use a straight-through twisted-pair cable when connecting any type
of network device to a port on the switch.

100 m (328 ft)

100 m (328 ft)

100 m (328 ft)

36

Unpacking the Switch

Note

Note

To unpack the switch, perform the following procedure:

1. Remove all of the components from the shipping package.

2. Place the switch on a level, secure surface.

3. In addition to the switch, verify that the shipping container includ es the

AT-GS908M, AT-GS916M, and AT-GS924M Switches Installation Guide

Store the packaging material in a safe location. You must use the
original shipping material if you need to return the unit to Allied
Telesis.

following items shown in Figure 7 on page 38.

For the AT-GS908M, rack mounting equipment (brackets and
screws) is not included in the shipping package and must be
purchased separately. Its rack mounting kit model number is AT­RKMT-J05.

37

Chapter 2: Installation

Retaining clip

Management cable

Four rubber feet

One regional AC
power cord

One, two, or four SFP
slot dust covers
(pre-installed).

(for desktop installation)

Two equipment rack
brackets
(not included in AT­GS908M package)

Four or six bracket screws
(not included in AT­GS908M package)

AT-GS916M: 4 each
AT-GS924M: 6 each

AT-GS916M

brackets

AT-GS924M

brackets

(pre-installed)

Figure 7. Shipping Package Contents

38

AT-GS908M, AT-GS916M, and AT-GS924M Switches Installation Guide

Installing the Power Cord Retaining Clip

Perform the following procedure to install the power cord retaining clip on
the AT-GS900M switch:

1. Locate the power cord retaining clip, as shown in Figure 8.

Figure 8. Power Cord Retaining Clip

2. Install the clip on the AC power connector on the back panel of the
switch. With the “u” of the clip facing down, press the sides of the clip
toward the center and insert the short ends into the holes in the
retaining bracket, as shown in Figure 9.

Figure 9. Inserting the Retaining Clip into the Retaining Bracket

39

Chapter 2: Installation

Installing the Switch on a Desktop or Table

You may install the switches on a desktop or table, or in a standard 19­inch equipment rack. To install the switch in a rack, see “Installing the
Switch in an Equipment Rack” on page 41.

To place the switch on a desktop or table, perform the following
procedure:

1. Remove all equipment from the package and store the packaging
material in a safe place.

2. Place the switch on a flat, secure surface (such as a desk or table)
leaving ample space around the unit for ventilation.

3. Go to “Installing SFP Transceivers” on page 43 or “Cabling the Switch”
on page 46.

40

AT-GS908M, AT-GS916M, and AT-GS924M Switches Installation Guide

Note

AT-GS924M

AT-GS916M

Installing the Switch in an Equipment Rack

The AT-GS916M and AT-GS924M rack mounting hardware is
included in the shipping package. However, the AT-GS908M rack
mounting equipment must be purchased separately. The rack
mounting kit model number is AT-RKMT-J05.

To install the switch in a standard 19-inch equipment rack, perform the
following procedure:

1. If the rubber feet are attached to the bottom of the switch, remove
them using a flat-head screwdriver.

2. Attach the two rack mount brackets to the sides of the switch using the
bracket screws that come with the unit. See Figure 10.

Figure 10. Attaching the Rack-Mount Brackets to the Switch

41

Chapter 2: Installation

3. Mount the switch in a standard 19-inch equipment rack using four
equipment rack screws (not provided with the switch). See Figure 11.

Figure 11. Mounting the Switch in an Equipment Rack

4. Go to “Installing SFP Transceivers” on page 43 or skip to “Cabling the
Switch” on page 46 if not installing SFP transceivers.

42

Installing SFP Transceivers

Note

Note

Warning

To install an SFP transceiver, perform the following procedure:

The transceiver can be hot-swapped; you do not need to power off
the switch to install a transceiver. However, you should always
remove the cables before removing the transceiver.

You should always install the transceiver before connecting the
fiber-optic cables to it.

1. Remove the transceiver from its shipping container and store the
packaging material in a safe location.

AT-GS908M, AT-GS916M, and AT-GS924M Switches Installation Guide

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
transceiver.

2. Remove the dust plug from an SFP slot. See Figure 12.

Figure 12. Removing the Dust Plug from an SFP Slot

3. Position the SFP transceiver with the label facing up.

43

Chapter 2: Installation

Note

Note

SFP Transceiver

Handle

4. Slide the transceiver into the SFP slot until it clicks into place. See
Figure 13.

Figure 13. Inserting the SFP

5. Verify that the handle on the transceiver is in the upright position, as
shown in Figure 14. This secures the transceiver and prevents it from
being dislodged from the slot.

44

Figure 14. Positioning the SFP Handle in the Upright Position

6. Repeat Step 2 through Step 5 to install additional SFP transceivers.

SFP transceivers are dust-sensitive. Always keep the plug in the
optical bores when a fiber-optic cable is not installed, or when
storing the SFP. When you do remove the plug, keep it for future
use.

Unnecessary removal and insertion of an SFP can lead to
premature failure.

For information on the cable specifications of the SFP, consult the
documentation shipped with the SFP.

AT-GS908M, AT-GS916M, and AT-GS924M Switches Installation Guide

7. Go to “Cabling the Switch” on page 46.

45

Chapter 2: Installation

Cabling the Switch

Observe the following guidelines when connecting twisted-pair and fiber­optic cables to the ports on the switch:

 The connector on the cable should fit snugly into the port on the

switch. The tab on the connector should lock the connector into
place.

 Because the twisted-pair ports have auto-MDI/MDI-X, you may use

straight-through twisted-pair cable to connect any type of network
device to the switch.

 If your network topology contains a loop where two or more

network devices can communicate with each other over more than
one network path, do not connect the network cables that form the
loop until after you activate a spanning tree protocol on the switch.
Data loops can adversely affect network performance.

 If you are creating a port trunk, do not connect the cables of the

trunk to the switch until after you have created the trunk in the
switch’s management software and the management software of
the switch at the other end of the trunk cables. Otherwise, a
network loop will result which can adversely affect network
performance.

46

Powering On the Switch

Warning

Note

To power on the switch, perform the following procedure:

1. Lift up the retaining clip and insert the power cord into the AC power
connector on the back of the switch, as shown in Figure 15.

AT-GS908M, AT-GS916M, and AT-GS924M Switches Installation Guide

Figure 15. Plugging in the AC Power Cord

2. Lower the retaining clip over the AC Power Cord as shown in
Figure 15.

3. Plug the other end of the power cord into a wall outlet.

Power cord is used as a disconnection device. To de-energize
equipment, disconnect the power cord.  E3

Pluggable Equipment. The socket outlet shall be installed near the
equipment and shall be easily accessible.  E5

47

Chapter 2: Installation

4. Verify that the POWER LED is green. If the LED is OFF, see Chapter
3, “Troubleshooting” on page 49.

The switch is now powered on and ready for network operations. For
information on how to manage the switch, see the AT-GS900M Series CLI
or Web Management Software User’s Guide.

48

Chapter 3

Note

Troubleshooting

This chapter contains information on how to troubleshoot the switch if a
problem occurs.

For further assistance, please contact Allied Telesis Technical
Support at www.alliedtelesis.com/support.

Problem 1: The POWER LED on the front of the switch is off.
Solutions: The unit is not receiving power. Try the following:

 Verify 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 it.

 Try connecting the unit to another power source.
 Try a different power cord.
 Verify that the voltage from the power source is within the required

levels for your region.

Problem 2: A twisted-pair port on the switch is connected to a network
device, but the port’s Link Activity LED is off.

Solutions: The port is unable to establish a link to a network device. Try
the following:

 Verify that the network device connected to the twisted-pair port is

powered on and is operating properly.

 Verify that the twisted-pair cable is securely connected to the port

on the switch channel and to the port on the remote network
device.

 Verify that the port is connected to the correct twisted-pair cable.

This is to eliminate the possibility that the port is connected to the
wrong network device, such as a powered-off device.

 Try connecting another network device to the twisted-pair port with

a different cable. If the twisted-pair port is able to establish a link,
then the problem is with the cable or the other network device.

 Verify that the twisted-pair cable does not exceed 100 meters (328

feet).

49

Chapter 3: Troubleshooting

Note

 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 and 1000 Mbps operation.

A 1000Base connection may require 5 to 10 seconds to establish a
link.

Problem 3: The Link Activity LED for an SFP transceiver is off.
Solutions: The fiber-optic port on the transceiver is unable to establish a

link to a network device. Try the following:

 Verify that the network device connected to the fiber-optic port is

operating properly.

 Verify that the fiber-optic cable is securely connected to the port on

the switch channel and to the port on the remote network device.

 Check that the SFP module is fully inserted in the slot.
 Verify that the operating specifications of the fiber-optic ports on

the SFP transceiver and the remote network device are
compatible.

 Verify that the correct type of fiber-optic cabling is being used.
 Verify that the port is connected to the correct fiber-optic cable.

This is to eliminate the possibility that the port is connected to the
wrong remote network device, such as a powered-off device.

 Try connecting another network device to the fiber-optic port using

a different cable. If the port is able to establish a link, then the
problem is with the cable or with the other network device.

 Use the switch’s management software to verify that the port is

enabled.

 If the remote network device is a management device, use its

management firmware to determine whether its port is enabled.

 Test the attenuation on the fiber-optic cable with a fiber-optic tester

to determine whether the optical signal is too weak (sensitivity) or
too strong (maximum input power).

Problem 4: Network performance between a twisted-pair port on the
switch and a network device is slow.

Solution: There might be a duplex-mode mismatch between the port and
the network device. This occurs when a twisted-pair port using Auto­Negotiation is connected to a device with a fixed duplex mode of full
duplex. If this is the cause of the problem, adjust the duplex mode of the
port on the network device or on the switch so that both ports are using the
same duplex mode.

50

Appendix A

Technical Specifications

This appendix contains the following specifications:

 “Physical Specifications”
 “Environmental Specifications” on page 52
 “Power Specifications” on page 52
 “Safety and Electromagnetic Emissions Certifications” on page 52
 “Connectors and Port Pinouts” on page 53

Physical Specifications

Dimensions

Table 9. Chassis Dimensions

Weight

Model W x D x H mm (in)

AT-GS908M 263 mm x 179 mm x 38 mm

(10.35 in x 7.0 in x 1.5 in)

AT-GS916M 341 mm x 210 mm x 44 mm

(13.4 in x 8.3 in x 1.7 in)

AT-GS924M 440 mm x 210 mm x 44 mm

(17.32 in x 8.3 in x 1.7 in)

Table 10. Chassis Weight

Model kg (lbs)

AT-GS908M 1.4 kg (3.09 lbs)
AT-GS916M 2.0 kg (4.41 lbs)
AT-GS924M 2.7 kg (5.95 lbs)

51

Appendix A: Technical Specifications

Environmental Specifications

Operating Temperature 0° C to 50° C (32° F to 122° F)
Storage Temperature -20° C to 60° C (-4° F to 140° F)
Operating Humidity 5% to 80% non-condensing
Storage Humidity 5% to 95% non-condensing
Operating Altitude Range Up to 2,000 m (6,562 ft)

Power Specifications

Input Supply Voltage - 100-240 VAC, 50 - 60 Hz

Table 11. Environmental Specifications

Table 12. Power Specifications

AT-GS908M 12 W
AT-GS916M 22 W
AT-GS924M 30 W

Safety and Electromagnetic Emissions Certifications

Table 13. Safety and Electromagnetic Emissions Certifications

FCC Part 15 Class A

RFI Emissions

Immunity EN55024
Electrical Safety EN60950-1 (ULEU), UL 60950-1

CISPR Class A
EN55022:2006/A:2007 Class A
RCM

(

CULUS

), CE

52

Environmental Compliance EU-RoHS compliant, WEEE

China RoHS compliant

Connectors and Port Pinouts

This section lists the connectors and connector pinouts.
Figure 16 illustrates the pin layout for an RJ-45 connector and port.

Figure 16. RJ-45 Connector and Port Pin Layout

Table 14 lists the RJ-45 pin signals when a twisted-pair port is operating in
the MDI configuration.

Table 14. MDI Pin Signals (10Base-T or 100Base-TX)

AT-GS908M, AT-GS916M, and AT-GS924M Switches Installation Guide

Pin Signal

1TX+
2TX­3RX+
6RX-

Table 15 lists the RJ-45 port pin signals when a twisted-pair port is
operating in the MDI-X configuration.

Table 15. MDI-X Pin Signals (10Base-T or 100Base-TX)

Pin Signal

1RX+
2RX­3TX+
6TX-

53

Appendix A: Technical Specifications

Table 16 lists the RJ-45 connector pins and their signals when a
1000Base-T port is operating at 1000 Mbps.

Table 16. RJ-45 1000Base-T Connector Pinouts

Pin Pair Signal

1 1 TX and RX+
2 1 TX and RX­3 2 TX and RX+
4 3 TX and RX+
5 3 TX and RX­6 2 TX and RX­7 4 TX and RX+
8 4 TX and RX-

54