Allied Telesis AT-GS950-28PS Service Manual

AT-GS950/48PS
AT-GS950/28PS
AT-GS950/16PS
AT-GS950/10PS

Gigabit Ethernet PoE+ Switches

Installation Guide

613-001768 Rev E

Copyright  2016 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

Note

Note

Standards

This section contains the following:

 “US Federal Communications Commission”
 “Industry Canada”
 “Emissions, Immunity and Electrical Safety Standards” on page 4
 “Translated Safety Statements” on page 4

US Federal Communications Commission

Radiated Energy

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.

Modifications or changes not expressly approved of by the manufacturer or the FCC, can void
your right to operate this equipment.

Industry Canada

Radiated Energy

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.

3

Emissions, Immunity and Electrical Safety Standards

Warning

Warning

RFI Emissions FCC Class A, EN55022 Class A, CISPR 22 Class A, VCCI Class A, C-TICK, CE

In a domestic environment this product may cause radio interference in which case the user
may be required to take adequate measures.  E84

EMC (Immunity) EN55024, EN61000-3-2, EN61000-3-3
Electrical Safety EN60950-1 (TUV), UL 60950-1 (

Laser Safety: EN60825  L7

CULUS

)

Translated Safety Statements

Important: The  indicates that a translation of the safety statement is available in a PDF
document titled Translated Safety Statements 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

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

Management Software............................................................................................................................... 21

Twisted Pair Ports...................................................................................................................................... 22

Power over Ethernet (PoE)........................................................... .... ... ... ................................................... 23

Combo Ports.............................................................................................................................................. 24

LEDs .......................................................................................................................................................... 26

eco-Friendly Button.................................................................................................................................... 36

Power Supply............................................................................................................................................. 38

Fans........................................................................................................................................................... 39

Chapter 2: Installation ......................................... ....................................................................... ................... 41

Reviewing Safety Precautions ................................................................................................................... 42

Selecting a Site for the Switch ................................................................................................................... 46

Cable Specifications................................................................................................................................... 47

Unpacking the Switch................................................................................................................................. 48

Installing the Switch on a Desktop............................................................................................................. 50

Installing the Switch in an Equipment Rack............................................................................................... 51

Installing the Switch on a Wall ................................................................................................................... 53

Installing Optional SFP Transceivers......................................................................................................... 56

Cabling the Switch ..................................................................................................................................... 59

Powering On the Switch............................................................................................................................. 60

Managing the Switch . .... ... ... ... .... ... ... ... .... ...................................... .... ... ... ... ... .... ... ... ... .... ............................ 64

Chapter 3: Troubleshooting .......................................................................................................................... 65

Appendix A: Technical Specifications ............................................................................................................ 69

Physical Specifications............................................................................................................................... 69

Environmental Specifications..... ... ... ... .... ... ... ... ... .... ... ... ... .......................................... .... ... ... ... ................... 70

Power Specifications.................................................................................................................................. 70

PoE Specifications..................................................................................................................................... 70

Safety and Electromagnetic Emissions Certifications................................................................................ 71

Connectors and Port Pinouts..................................................................................................................... 71

5

Contents

6

Figures

Figure 1: AT-GS950/10PS and AT-GS950/16PS Front Panels........................................................................................... 18

Figure 2: AT-GS950/28PS and AT-GS950/48PS Front Panels........................................................................................... 19

Figure 3: AT-GS950/10PS Back Panel................................................................................................................................ 20

Figure 4: AT-GS950/16PS and AT-GS950/28PS Back Panels........................................................................................... 20

Figure 5: AT-GS950/48PS Back Panel................................................................................................................................ 20

Figure 6: PWR LED on AT-GS950/10PS............................................................................................................................ 26

Figure 7: SYSTEM LED on AT-GS950/16PS...................................................................................................................... 27

Figure 8: SYS LED on AT-GS950/28PS.............................................................................................................................. 27

Figure 9: SYS LED on AT-GS950/48PS.............................................................................................................................. 27

Figure 10: AT-GS950/10PS Link/Activity and Speed LEDs................................................................................................. 28

Figure 11: AT-GS950/16PS Link/Activity/Speed LEDs........................................................................................................ 29

Figure 12: AT-GS950/28PS Link/Activity/Speed LEDs........................................................................................................ 29

Figure 13: AT-GS950/48PS Link/Activity/Speed Port LEDs................................................................................................ 30

Figure 14: AT-GS950/10PS SFP Status LEDs.................................................................................................................... 31

Figure 15: AT-GS950/16PS SFP Status LEDs.................................................................................................................... 31

Figure 16: AT-GS950/28PS SFP Status LEDs.................................................................................................................... 31

Figure 17: AT-GS950/48PS SFP Status LEDs.................................................................................................................... 32

Figure 18: AT-GS950/10PS PoE and PoE MAX LEDs........................................................................................................ 34

Figure 19: AT-GS950/16PS PoE and PoE MAX LEDs........................................................................................................ 34

gure 20: AT-GS950/28PS PoE and PoE MAX LEDs........................................................................................................ 34

Fi

Figure 21: AT-GS950/48PS PoE and PoE MAX LEDs........................................................................................................ 34

Figure 22: eco-Friendly Button............................................................................................................................................ 36

Figure 23: AT-GS950/28PS Unit Orientation....................................................................................................................... 45

Figure 24: Shipping Package Contents............................................................................................................................... 49

Figure 25: Attaching the Rubber Feet ................................................................................................................................. 50

Figure 26: Attaching the Rack-Mount Brackets to the Switch.............................................................................................. 51

Figure 27: Attaching the Rack-Mount Brackets to the Switch (Continued)............................................. ... ... ....................... 52

Figure 28: Mounting the Switch in an Equipment Rack. ...................................................................................................... 52

Figure 29: Attaching the Brackets to Install the Switch on a Wall........................................................................................ 53

Figure 30: Marking the Screw Hole Locations..................................................................................................................... 54

Figure 31: Securing the Switch to the Wall.......................................................................................................................... 55

Figure 32: Inserting the SFP................................................................................................................................................ 57

Figure 33: Positioning the SFP Handle in the Upright Position ........................................................................................... 57

Figure 34: Installing the Retaining Clip................................................................................................................................ 60

Figure 35: Raising the Retaining Clip.................................................................................................................................. 61

Figure 36: Plugging in the AC Power Cord.......................................................................................................................... 61

Figure 37: Lowering the Retaining Clip................................................................................................................................ 62

Figure 38: Plugging in the AC Power Cord.......................................................................................................................... 63

Figure 39: RJ-45 Connector and Port Pin Layout................................................................................................................ 71

7

List of Figures

8

Tables

Table 1. Combo Ports .........................................................................................................................................................24

Table 2. AT-GS950/10PS PWR LED Functional Descriptions ...........................................................................................26

Table 3. AT-GS950/16PS, AT-GS950/28PS, and AT-GS950/48PS SYS LED Functional Descriptions ............................28

Table 4. AT-GS950/10PS L/A and SPD LEDs Functional Descriptions .............................................................................29

Table 5. AT-GS950/16PS, AT-GS950/28PS, and AT-GS950/48PS L/A LED Functional Descriptions ..............................30

Table 6. SFP Slot LED Functional Descriptions - AT-GS950/10PS, AT-GS950/16PS, AT-GS950/48PS ..........................32

Table 7. SFP Slot LED Functional Descriptions - AT-GS950/28PS ...................................................................................33

Table 8. PoE Status LED Functional Descriptions .............................................................................................................35

Table 9. Twisted Pair Cabling and Distances .....................................................................................................................47

Table 10. Chassis Dimensions ........................................................................................................................................... 69

Table 11. Chassis Weight ...................................................................................................................................................69

Table 12. Environmental Specifications ..............................................................................................................................70

Table 13. Max AC Input Power Specifications ....................................................................................................................70

Table 14. Max Ports Supported per PoE Class .................................................. ... ... ..........................................................71

Table 15. Safety and Electromagnetic Emissions Certifications .........................................................................................71

Table 16. MDI Pin Signals (10Base-T or 100Base-TX) ......................................................................................................72

Table 17. MDI-X Pin Signals (10Base-T or 100Base-TX) ..................................................................................................72

Table 18. RJ-45 1000Base-T Connector Pinouts ...............................................................................................................72

9

List of Tables

10

Preface

This guide contains the installation instructions for the AT-GS950/10PS,
AT-GS950/16PS, AT-GS950/28PS, and AT-GS950/48PS Gigabit Ethernet
PoE+ Switches. This preface contains the following sections:

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

The AT-GS950/10PS, AT-GS950/16PS, AT-GS950/28PS, and AT-GS950/
48PS switches may be collectively referred to as GS950/PS Series
switches in this guide.

11

Symbol Conventions

Note

Caution

Warning

Warning

Note

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.

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

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 questions in our knowledge database,
check support tickets, learn about 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 a Return Merchandise

Authorization (RMA) request via our interactive support center.

GS950/PS Series 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-GS950/10PS, AT-GS950/
16PS, AT-GS950/28PS, and AT-GS950/48PS Layer 2 Gigabit Ethernet
PoE+ Switches and contains the following sections:

 “Features” on page 16
 “Front and Back Panels” on page 18
 “Management Software” on page 21
 “Twisted Pair Ports” on page 22
 “Power over Ethernet (PoE)” on page 23
 “Combo Ports” on page 24
 “LEDs” on page 26
 “eco-Friendly Button” on page 36
 “Power Supply” on page 38
 “Fans” on page 39

15

Chapter 1: Overview

Note

Note

Features

Here are the hardware features of the GS950/PS Series switches.

Twisted Pair

Ports

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

 10, 16, 24, or 48 ports per switch
 8, 16, or 24 Power over Ethernet (PoE) 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
 Support for Jumbo frames up to 10KB
 RJ-45 connectors

SFP Slots The AT-GS950/10PS, AT-GS950/16PS, and AT-GS950/48PS switches

support both 100Base-FX and 1000Base-SX/LX transceivers. The
AT-GS950/28PS switch supports 1000Base-SX/LX transceivers. The
switches support either two or four slots for SFPs:

 Two SFP slots on the AT-GS950/10PS and AT-GS950/16PS

switches

 Four SFP slots on the AT-GS950/28PS and AT-GS950/48PS

switches

On the AT-GS950/10PS, AT-GS950/16PS, and AT-GS950/48PS
switches, the SFP slots are paired with twisted pair ports on the
switch to form combo ports. For more information, see “Combo
Ports” on page 24.

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

16

Note

See the product data sheets for the specific Allied Telesis SFP
modules supported by the GS950/PS Series switches.

LEDs Here is a brief description of the port LEDs:

 Power LED/SYS; refer to “PWR/SYS LEDs” on page 26.
 Speed and link/activity LEDs for the twisted pair ports; refer to “10/

100/1000 BaseT Link Activity LEDs” on page 28.

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

page 31.

 eco-Friendly button turns off the LEDs to conserve electricity; refer

to “PoE LEDs” on page 33.

GS950/PS Series Switches Installation Guide

Installation

Options

Power

Conservation

MAC Address

Table

The GS950/PS Series switches can be installed in the following ways:

 Rack mounted in a 19-inch equipment rack
 Mounted on a desk or tabletop
 Wall mounted for the AT-GS950/10PS, AT-GS950/16PS, and

AT-GS950/28PS only

The GS950/PS Series switches have the following power conservation
features:

 eco-Friendly button to turn off the port LEDs when the system is

not being monitored

 High-efficiency power supply
 Power scaling based on traffic loads on ports operating at 1000

Mbps (port power scaling not available at 10 or 100 Mbps)

 Power shutdown on unused ports

Here are the basic features of the MAC address table:

 Storage capacity up to 16KB MAC address entries
 Automatic learning and aging

17

Chapter 1: Overview

AT-GS950/16

AT-GS950/16PS

10/100/1000Base-T

SFP Slots

Twisted Pair Ports

AT-GS950/10PS

eco-Friendly

Button

Port and

System LEDs

eco-Friendly

Button

SFP Slots

Port and

System LEDs

eco-Friendly

Button

10/100/1000Base-T
Twisted Pair Ports

Front and Back Panels

Figure 1 illustrates the front panels of the AT-GS950/10PS and
AT-GS950/16PS Gigabit Ethernet Switches.

18

Figure 1. AT-GS950/10PS and AT-GS950/16PS Front Panels

Figure 2 on page 19 illustrates the front panels of the AT-GS950/28PS
and AT-GS950/48PS Gigabit Ethernet Switches.

GS950/PS Series Switches Installation Guide

AT-GS950/48PS

SFP Slots

System LEDs

eco-Friendly

Button

10/100/1000Base-T
Twisted Pair Ports

AT-GS950/28PS

SFP Slots

eco-Friendly

Button

10/100/1000Base-T
Twisted Pair Ports

Port and

System LEDs

Figure 2. AT-GS950/28PS and AT-GS950/48PS Front Panels

19

Chapter 1: Overview

AC Input

AC Input

AC Input

See Figure 3 for an example of the AT-GS950/10PS back panel.

Figure 3. AT-GS950/10PS Back Panel

See Figure 4 for an example of the AT-GS950/16PS and AT-GS950/28PS
back panels.

Figure 4. AT-GS950/16PS and AT-GS950/28PS Back Panels

See Figure 5 for an example of the AT-GS950/48PS back panel.

Figure 5. AT-GS950/48PS Back Panel

20

Management Software

The switches are shipped with the management software pre-installed.
The software provides a web-browser interface for in-band, over-the­network management. Although the three models have the same features,
each has a different management software program. The programs are:

 AT-S110: refer to the Web Interface User’s Guide for the

 AT-S111: refer to the Web Interface User’s Guide for the

 AT-S112: refer to the Web Interface User’s Guide for the

 AT-S126: refer to the Web Interface User’s Guide for the

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
listed above.

GS950/PS Series Switches Installation Guide

AT-GS950/10PS Switch

AT-GS950/48PS Switch

AT-GS950/16PS Switch

AT-GS950/28PS Switch

21

Chapter 1: Overview

Note

Twisted Pair Ports

The AT-GS950/10PS, AT-GS950/16PS, AT-GS950/28PS, and
AT-GS950/48PS Layer 2 Gigabit Ethernet Switches feature 10, 16, 24,
and 48 twisted pair ports, respectively. All ports are 10Base-T, 100Base­TX, 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 71.

The ports have a maximum operating distance of 100 meters (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.

22

Power over Ethernet (PoE)

Warning

Note

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
this device is located.  E40

Power over Ethernet technology permits both power and data to be
transmitted over an Ethernet cable. Both PoE (IEEE802.3af) and PoE+
(IEEE802.3at) are supported on the 10/100/1000T ports on the GS950/PS
Series switches. Here is a summary of the PoE feature:

 Powered device classes 0,1, 2, 3 and 4 are supported.
 Port prioritization is provided on all PoE ports.
 The default configuration is DISABLED on all PoE switch ports.
 The PoE configuration parameters can be set through the switch’s

web management interface.

GS950/PS Series Switches Installation Guide

The maximum number of ports that the GS950/PS Series switches will
support when only one class of service is required from the powered
devices connected to the PoE ports is shown in Table 14 on page 71.

Each switch can support any combination of PoE classes 0 - 4
simultaneously up to the maximum PoE power that is available from
the switch.

Port Power Priority

When the power budget for the switch is reached, each port is allotted
power according to its priority level. You can set the powe r priority of ea ch
PoE port to one of three levels: Low, High, and Critical. The default is Low.

If the priority level of all the ports is set to the same value, the lowest port
number has the highest port power priority. For instance, if you connect
eight class 4 powered devices to ports 1 - 8 on an AT-GS950/16PS switch,
the PoE power budget is exceeded, and some ports will have the PoE
power turned off. The ports allowed to transmit power are determined by
the Port Priority feature. In this case, port 1 has the highest power priority
level and transmits PoE power followed by port 2, etc., through port 6 while
ports 7 and 8 are not allowed to transmit any PoE power.

23

Chapter 1: Overview

Note

Combo Ports

The AT-GS950/10PS and AT-GS950/16PS switches have two combo
ports, and the AT-GS950/48PS switch has four combo ports.

The AT-GS950/28PS switch does not have 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 face-plates of the units. The ports and slots are listed in Table 1.

Table 1. Combo Ports

Switch Twisted Pair Port SFP Slot

9R 9

AT-GS950/10PS

10R 10
15R 15

AT-GS950/16PS

16R 16
45R 45

AT-GS950/48PS

46R 46
47R 47
48R 48

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.

24

GS950/PS Series Switches Installation Guide

 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.

25

Chapter 1: Overview

Note

PWR LED

LEDs

There are four types of LEDs on the GS950/PS Series switches:

 “PWR/SYS LEDs”
 “10/100/1000 BaseT Link Activity LEDs” on page 28
 “SFP LEDs” on page 31
 “PoE LEDs” on page 33

PWR/SYS LEDs The PWR LED reports the status of AC power and is located on the left

side of the front panel of the AT-GS950/10PS switch. See Figure 6.

All of the port LEDs are off when the switch is operating in the low
power mode. To toggle on the LEDs, use the eco-Friendly button.
See “eco-Friendly Button” on page 36 for more information.

Figure 6. PWR LED on AT-GS950/10PS

Table 2 describes the PWR LED for the AT-GS950/10PS switch.

Table 2. AT-GS950/10PS PWR LED Functional Descriptions

LED State Description

Off Either the switch is not receiving AC power or

the AC input power is operating outside the

PWR

Steady

Green

normal range.
The switch is receiving AC input power and is

operating normally.

On the AT-GS950/16PS, AT-GS950/28PS, and AT-GS950/48PS
switches, the power and FAN status is indicated with a SYSTEM or SYS
LED. See Figure 7 on page 27, Figure 8 on page 27, and Figure 9 on page

27.

26

GS950/PS Series Switches Installation Guide

SYSTEM LED

SYS LED

SYS LED

Figure 7. SYSTEM LED on AT-GS950/16PS

Figure 8. SYS LED on AT-GS950/28PS

Figure 9. SYS LED on AT-GS950/48PS

Table 3 on page 28 describes the functions for the SYSTEM/SYS LED for
the AT-GS950/16PS, AT-GS950/28PS, and AT-GS950/48PS switches.

27

Chapter 1: Overview

Note

Speed (SPD)

and

Link/Activity (L/A)

LEDs

Table 3. AT-GS950/16PS, AT-GS950/28PS, and AT-GS950/48PS SYS

LED Functional Descriptions

LED State Description

Off Either the switch is not receiving power or the

AC input power is operating outside the
normal range.

SYSTEM/

SYS

Steady

Green

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

10/100/1000

BaseT Link

Activity LEDs

Steady

Red

The Link Activity (L/A) LEDs provide information about the 10/100/
1000Base-T ports.

The system is experiencing a fan failure.

AT-GS950/10PS Link/Activity and Speed LEDs

The AT-GS950/10PS switch indicates L/A (link activity) and SPD (speed)
with two LEDs for each port. See Figure 10.

All of the port LEDs are off when the switch is operating in the low
power mode. To toggle on the LEDs, use the eco-Friendly button.
See “eco-Friendly Button” on page 36 for more information.

28

Figure 10. AT-GS950/10PS Link/Activity and Speed LEDs

See Table 4 on page 29 for a description for the AT-GS950/10PS Link/
Activity and Speed LEDs.

GS950/PS Series Switches Installation Guide

Link/Activity (L/A)/
Speed LEDs

Link/Activity (L/A)/
Speed LEDs

.

Table 4. AT-GS950/10PS L/A and SPD LEDs Functional Descriptions

LED State Description

Off The port has not established a link with a

Link/Activity

(L/A)

Blinking

Green

network device.
The port is transmitting or receiving

network packets.

Off The port has not established a link with a

network device.
Speed
(SPD)

Steady
Amber

The maximum operating speed of the

port is 10 or 100 Mbps.

Steady

Green

The maximum operating speed of the

port is 1000 Mbps.

AT-GS950/16PS and AT-GS950/28PS Link/Activity/Speed LEDs

The AT-GS950/16PS and AT-GS950/28PS switches have one LED per
port on the front panel to indicate link, activity and speed status. See
Figure 11 and Figure 12.

Figure 11. AT-GS950/16PS Link/Activity/Speed LEDs

Figure 12. AT-GS950/28PS Link/Activity/Speed LEDs

29

Chapter 1: Overview

Link/Activity (L/A)/Speed LEDs

AT-GS950/48PS Link/Activity/Speed LEDs

The AT-GS950/48PS switch has one LED per port to indicate the port’s
link, activity and speed status. These LEDs are located next to each port.
See Figure 13.

Figure 13. AT-GS950/48PS Link/Activity/Speed Port LEDs

See Table 5 for a description for the AT-GS950/16PS, AT-GS950/28PS,
and AT-GS950/48PS Link/Activity/Speed LEDs.

Table 5. AT-GS950/16PS, AT-GS950/28PS, and AT-GS950/48PS L/A

LED Functional Descriptions

LED State Description

Off The port has not established a link with a

network device.

Steady

Green

The port has established a 1000Mbps link to
a network device, but it is not transmitting or
receiving network packets.

L/A (link/

activity)

Blinking

Green

Steady
Amber

The port is transmitting or receiving network
packets at 1000 Mbps.

The SFP transceiver has established a link at
either 10 or 100 Mbps with a network device,
but is not transmitting or receiving network
packets.

Blinking

Amber

The port is transmitting or receiving network
packets at 10 or 100 Mbps.

30

GS950/PS Series Switches Installation Guide

Note

SFP LEDs

SFP LEDs

SFP LEDs

SFP LEDs The SFP LEDs indicate the Link/Activity and Speed status of each SFP

slot.

All of the port LEDs are off when the switch is operating in the low
power mode. To toggle on the LEDs, use the eco-Friendly button.
See “eco-Friendly Button” on page 36 for more information.

The AT-GS950/10PS, AT-GS950/16PS, and AT-GS950/28PS switches
have the SFP LEDs on the front panel. See Figure 14, Figure 15, and
Figure 16.

Figure 14. AT-GS950/10PS SFP Status LEDs

Figure 15. AT-GS950/16PS SFP Status LEDs

Figure 16. AT-GS950/28PS SFP Status LEDs

31

Chapter 1: Overview

Speed and
Link/Activity
SFP LEDs

The AT-GS950/48PS SFP LEDs are located between the upper and lower
SFP slots. See Figure 17.

Figure 17. AT-GS950/48PS SFP Status LEDs

Table 6 describes the Link LEDs for the SFP slots on the AT-GS950/
10PS, AT-GS950/16PS, AT-GS950/48PS switches.

Table 6. SFP Slot LED Functional Descriptions - AT-GS950/10PS,

AT-GS950/16PS, AT-GS950/48PS

LED State Description

Off The port on the SFP transceiver has not

established a link with an end node or the
transceiver slot is empty.

SFP

Blinking

Green

Steady

Green

The SFP transceiver is transmitting or
receiving network packets at 1000 Mbps.

The SFP transceiver has established a link
with a network device at 1000 Mbps, but is
not transmitting or receiving network p acket s.

Blinking

Amber
Steady

Amber

The SFP transceiver is transmitting or
receiving network packets at 100 Mbps.

The SFP transceiver has established a link
with a network device at 100 Mbps, but is not
transmitting or receiving network packets.

Table 7 on page 33 describes the Link LEDs for the SFP slots on the
AT-GS950/28PS switch.

32

GS950/PS Series Switches Installation Guide

Note

Note

Table 7. SFP Slot LED Functional Descriptions - AT-GS950/28PS

LED State Description

Off The port on the SFP transceiver has not

established a link with an end node or the
transceiver slot is empty.

SFP

Blinking

Green

Steady

Green

The SFP transceiver is transmitting or
receiving network packets at 1000 Mbps.

The SFP transceiver has established a link
with a network device at 1000 Mbps, but is
not transmitting or receiving network packet s.

PoE LEDs All GS950/PS Series switches have two types of PoE LEDs indicating the

PoE status for each port and maximum power limit of the switch’s PoE
power supply.

Each switch model has individual PoE LEDs indicating the PoE status of
each individual port. Each chassis also has one PoE MAX LED which is
used to determine if you have exceeded the maximum power that the
chassis is capable of supplying to the powered devices (PDs).

The AT-GS950/10PS switch can supply PoE power to PDs on ports 1 - 8.
See Figure 18 on page 34 for the locations of the PoE LEDs.

The AT-GS950/16PS switch can supply PoE power to PDs on ports 1 - 16.
See Figure 19 on page 34 for the location of the PoE LEDs.

The AT-GS950/28PS switch can supply PoE power to PDs on ports 1 - 24.
See Figure 20 on page 34 for the location of the PoE status LEDs.

The AT-GS950/48PS switch can supply PoE power to PDs on ports 1 - 24.
See Figure 21 on page 34 for the location of the PoE status LEDs.

See “Power over Ethernet (PoE)” on page 23 for more information
about this PoE feature.

All of the port LEDs are off when the switch is operating in the low
power mode. To toggle on the LEDs, use the eco-Friendly button.
See “eco-Friendly Button” on page 36 for more information.

33

Chapter 1: Overview

PoE Port LEDs

PoE MAX LED

PoE MAX LED

PoE Port LEDs

PoE MAX LED

PoE Port LEDs

PoE MAX LED

PoE Port LEDs

Figure 18. AT-GS950/10PS PoE and PoE MAX LEDs

Figure 19. AT-GS950/16PS PoE and PoE MAX LEDs

Figure 20. AT-GS950/28PS PoE and PoE MAX LEDs

34

Figure 21. AT-GS950/48PS PoE and PoE MAX LEDs

GS950/PS Series Switches Installation Guide

See Table 8 for a functional description of the PoE status LEDs.

Table 8. PoE Status LED Functional Descriptions

LEDs State Description

The total PoE output power for all ports on the

Red

PoE

switch exceeds the maximum PoE power that the
switch can deliver.

MAX

Off The switch has spare power for a new PD.
Green PoE power is being supplied to the PD normally.

The total PoE output power for this port exceeds

PoE

Amber

the maximum power budget for the switch.

Off PoE power is not being supplied.

35

Chapter 1: Overview

Note

Caution

eco-Friendly

Button

eco-Friendly Button

The eco-Friendly button serves multiple functions. See Figure 22 for its
location.

By pressing this button, you can:

 Toggle the front panel LEDs on and off to conserve electricity

when you are not physically monitoring the switch.

 Reboot your switch while maintaining the current configuration.
 Reset your switch configuration to the factory default values.

eco-Friendly

Button Operation

Figure 22. eco-Friendly Button

The eco-Friendly button does not control the Power LED.

The button operates as follows:

 Conserve energy: When you press the eco-Friendly button for 1 to

4 seconds, the front panel port LEDs are disabled. You may use
the button to turn off the LEDs when you are not monitoring the
switch. To turn the port LEDs on, press the eco-Friendly button for
1 to 4 seconds again. Toggling the LEDs does not affect the
network operations of the switch.

 Reboot the switch: By pressing the button for 5 to 9 seconds, you

can initiate a software reboot of the switch.

The switch does not forward network traffic during the reboot
process. Some network traffic may be lost.  E113

36

GS950/PS Series Switches Installation Guide

Caution

Note

 Reset the switch to factory default settings: By pressing the button

for more than 10 seconds, you initiate a software reboot of the
switch followed by a reset of the switch to its factory settings.

Reboot/Reset the

Switch

Use the following procedure to reboot the switch or reboot the switch and
reset the switch to its factory default settings with the eco-Friendly button:

The switch does not forward network traffic during the reboot
process. Some network traffic may be lost.  E113

1. To reset the switch, press the eco-Friendly button for 5 to 9 seconds.
Rebooting takes approximately 1 to 2 minutes before the switch comes

back online and is ready to transmit Ethernet traffic again.

2. To reboot the switch and reset the switch to its factory default settings,
press the eco-Friendly button for more than 10 seconds.

This initiates a software reboot of the switch and resets all of the
configuration parameters of the switch to the factory default settings,
including the management IP address which reverts to 192.168.1.1. If
your browser is configured for another IP address, you must
reconfigure your browser and workstation before you can connect to
the switch again.

In the management software, you can disable both the reboot and
factory default reset functions for the eco-Friendly button. For more
information, see “Management Software” on page 21 for a list of the
guides.

37

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 70.

38

Fans

Note

GS950/PS Series Switches Installation Guide

The AT-GS950/16PS, AT-GS950/28PS, and AT-GS950/48PS switches
have internal fans. You cannot remove or replace these fans in the field.
The fan status is indicated with the SYSTEM LED. See “PWR/SYS LEDs”
on page 26 for more information.

The AT-GS950/10PS switch does not have a fan.

39

Chapter 1: Overview

40

Chapter 2

Installation

This chapter contains the following sections:

 “Reviewing Safety Precautions” on page 42
 “Selecting a Site for the Switch” on page 46
 “Cable Specifications” on page 47
 “Unpacking the Switch” on page 48
 “Installing the Switch on a Desktop” on page 50
 “Installing the Switch in an Equipment Rack” on page 51
 “Installing the Switch on a Wall” on page 53
 “Installing Optional SFP Transceivers” on page 56
 “Cabling the Switch” on page 59
 “Powering On the Switch” on page 60
 “Managing the Switch” on page 64

41

Chapter 2: Installation

Note

Warning

Warning

Warning

Warning

Warning

Warning

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”
on the Allied Telesis website at http://www.alliedtelesis.com/
support.

Class 1 Laser product.  L1

Do not stare into the laser beam.  L2

Do not look directly at the fiber optic cable ends or inspect the cable
ends with an optical lens.  L6

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

42

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

GS950/PS Series Switches Installation Guide

Warning

Note

Caution

Warning

Note

Caution

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 the
equipment and shall be easily accessible.  E5

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 40° degrees C.  E7

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 overcurrent 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

43

Chapter 2: Installation

Note

Caution

Warning

Warning

Warning

Caution

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

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 (e.g., use of power strips).

 E37

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
this device is located.  E40

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.  E86

The switch does not forward network traffic during the reboot
process. Some network traffic may be lost.  E113

Wall-Mount Orientation Installation Requirements

The AT-GS950/28PS unit must be installed with the RJ45 connectors
facing up (toward the ceiling) or down (toward the floor) and cannot be
installed with the RJ45 connectors facing right or left. See Figure 23 on
page 45.

44

GS950/PS Series Switches Installation Guide

Correct Orientation

Incorrect Orientation

Figure 23. AT-GS950/28PS Unit Orientation

45

Chapter 2: Installation

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.

 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.

46

Cable Specifications

Note

Table 9 contains the cable specifications for the twisted pair ports.

Table 9. Twisted Pair Cabling and Distances

Speed Type of Cable

GS950/PS Series Switches Installation Guide

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)

47

Chapter 2: Installation

Note

Unpacking the Switch

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 an AT-GS950/10PS, AT-GS950/16PS, AT-GS950/28PS,

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.

or AT-GS950/48PS switch, verify that the shipping container includes
the following items shown in Figure 24 on page 49.

48

Two equipment rack or
wall brackets

Eight bracket screws

Four wall anchors

Four wall screws

Four rubber feet (for
desktop installation)

One regional AC
power cord

One power cord
retaining clip (not
included with
AT-GS950/48PS)

GS950/PS Series Switches Installation Guide

Figure 24. Shipping Package Contents

49

Chapter 2: Installation

Installing the Switch on a Desktop

You may install the switches on a desktop, in a standard 19-inch
equipment rack, or on a wall. To install the switch in a rack, see “Installing
the Switch in an Equipment Rack” on page 51. To install the switch on a
wall, see “Installing the Switch on a Wall” on page 53.

To install the switch on a desktop, perform the following procedure:

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

2. Turn the switch over and place it on a table.

3. Attach the four rubber feet to the bottom of the switch as shown in
Figure 25.

Figure 25. Attaching the Rubber Feet

4. Turn the switch over again and place it on a flat, secure surface (such
as a desk or table) leaving ample space around the unit for ventilation.

5. Go to “Installing Optional SFP Transceivers” on page 56 or “Cabling
the Switch” on page 59.

50

Installing the Switch in an Equipment Rack

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
eight bracket screws that come with the unit. There are four possible
positions in which the brackets may be installed.

GS950/PS Series Switches Installation Guide

Figure 26. Attaching the Rack-Mount Brackets to the Switch

51

Chapter 2: Installation

Figure 27. Attaching the Rack-Mount Brackets to the Switch (Continued)

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

52

Figure 28. Mounting the Switch in an Equipment Rack

4. Go to “Installing Optional SFP Transceivers” on page 56 or “Cabling
the Switch” on page 59.

Installing the Switch on a Wall

Note

Only the AT-GS950/10PS, AT-GS950/16PS, and AT-GS950/28PS
switches can be installed on a wall.

The AT-GS950/48PS is too heavy to be safely installed on a wall.

To install the AT-GS950/10PS, AT-GS950/16PS, or AT-GS950/28PS
switch on a wall, perform the following procedure:

1. Turn the switch over and place it on a table.

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

3. Orient the brackets against the sides of the switch, as shown in Figure
29, and secure them to the unit with the eight brackets screws included
with the switch.

GS950/PS Series Switches Installation Guide

Figure 29. Attaching the Brackets to Install the Switch on a Wall

53

Chapter 2: Installation

4. Have another person hold the switch at the wall location where the
switch is to be installed, while you use a pencil or pen to mark the wall
with the locations of the four holes in the brackets. The switch should
be oriented such that its front faceplate is facing up and is level to the
floor. See Figure 30.

54

Figure 30. Marking the Screw Hole Locations

5. Install the four plastic anchors included with the switch into the wall, at
the locations marked in the previous step. The anchors require 0.635
mm (0.25 in.) holes.

GS950/PS Series Switches Installation Guide

6. While another person holds the switch at the wall location, secure it to
the wall using the four wall mounting screws. See Figure 31.

Figure 31. Securing the Switch to the Wall

7. Go to “Installing Optional SFP Transceivers” on page 56 or “Cabling
the Switch” on page 59.

55

Chapter 2: Installation

Note

Note

Warning

Installing Optional SFP Transceivers

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, 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.

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.  E86

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

56

GS950/PS Series Switches Installation Guide

Note

SFP Transceiver

Handle

3. Slide the transceiver into the SFP slot until it clicks into place. See
Figure 32.

Figure 32. Inserting the SFP

4. Verify that the handle on the transceiver is in the upright position, as
shown in Figure 33. This secures the transceiver and prevents it from
being dislodged from the slot.

Figure 33. Positioning the SFP Handle in the Upright Position

5. Repeat Step 1 through Step 4 to install additional SFP transceivers.

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.

57

Chapter 2: Installation

6. Go to “Cabling the Switch” on page 59.

58

Cabling the Switch

GS950/PS Series Switches Installation Guide

Observe the following guidelines when connecting twisted pair and fiber
optic 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. Otherwise, a network loop will
result which can adversely affect network performance.

59

Chapter 2: Installation

Powering On the Switch

To power on the switch, perform one of the following procedures,
depending on your model:

 For AT-GS950/10PS, AT-GS950/16PS, and AT-GS950/28PS

switches, refer to “Powering on the AT-GS950/10PS, AT-GS950/
16PS, and AT-GS950/28PS Switches”.

 For the AT-GS950/48PS switch, refer to “Powering on the AT-GS950/

48PS Switch” on page 63.

Powering on the
AT-GS950/10PS,
AT-GS950/16PS,

and AT-GS950/

28PS Switches

To install the power cord retaining clip and power on the switch, perform
the following procedure:

1. To install the power cord retaining clip, position it with the “u” part
facing down, press in the sides, and insert the ends of the clip into the
holes in the retaining bracket on the AC connector. See Figure 34.

60

Figure 34. Installing the Retaining Clip

GS950/PS Series Switches Installation Guide

2. Raise the retaining clip. See Figure 35.

Figure 35. Raising the Retaining Clip

3. Connect the power cord to the connector. See Figure 36.

Figure 36. Plugging in the AC Power Cord

61

Chapter 2: Installation

Warning

Note

4. Lower the retaining clip to secure the power cord to the switch. See
Figure 37.

Figure 37. Lowering the Retaining Clip

5. 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

6. Verify that the POWER LED is green. If the LED is OFF, see Chapter
3, “Troubleshooting” on page 65.

62

GS950/PS Series Switches Installation Guide

Warning

Note

Powering on the

AT-GS950/48PS

Switch

To power on the switch, perform the following procedure:

1. Plug the power cord into the AC power connector on the back of the
switch, as shown in Figure 38.

Figure 38. Plugging in the AC Power Cord

2. 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

3. Verify that the POWER LED is green. If the LED is OFF, see Chapter
3, “Troubleshooting” on page 65.

63

Chapter 2: Installation

Managing the Switch

The switch is now powered on and ready for network operations. For
information on how to manage the switch, see one of the following
manuals:

 AT-S110 Web Interface User’s Guide for the AT-GS950/10PS

Switch

 AT-S111 Web Interface User’s Guide for the AT-GS950/48PS

Switch

 AT-S112 Web Interface User’s Guide for the AT-GS950/16PS

Switch

 AT-S126 Web Interface User’s Guide for the AT-GS950/28PS

Switch

64

Chapter 3

Note

Note

Caution

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: All of the port LEDs are off even though the ports are
connected to active network devices.

Solution: The switch is probably operating in low power mode. To toggle
on the LEDs, press the eco-Friendly button on the front panel.

Pressing the eco-Friendly button for more than 4 seconds causes
the switch to reboot. Refer to “eco-Friendly Button Operation” on
page 36 for details on eco-Friendly button operation and how it
affects the switch.

The switch does not forward network traffic during the reboot
process. Some network traffic may be lost.  E113

65

Chapter 3: Troubleshooting

Note

Problem 3: A twisted pair port on the switch is connected to a network

device, but the port’s LINK/ACT 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 media converter 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).

 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 4: The LINK/ACT 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 p ort on

the media converter 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.

66

GS950/PS Series Switches Installation Guide

 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 5: 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.

Problem 6: A port’s LINK/ACT LED is blinking.
Solutions: The link between the port and the network device is

intermittent. Try the following:

 Connect another network device with a different cable to the port. If

the Link LED remains steady on, then the problem is with the
original cable or the network device.

 If the problem is with an SFP transceiver, check that the

transceiver is fully inserted in the slot.

67

Chapter 3: Troubleshooting

68

Appendix A

Technical Specifications

Below are the technical specifications for the AT-GS950/10PS,
AT-GS950/16PS, AT-GS950/28PS, and AT-GS950/48PS switches. The
specification categories are as follows:

 “Physical Specifications”
 “Environmental Specifications” on page 70
 “Power Specifications” on page 70
 “PoE Specifications” on page 70
 “Safety and Electromagnetic Emissions Certifications” on page 71
 “Connectors and Port Pinouts” on page 71

Physical Specifications

Dimensions

Weight

Table 10. Chassis Dimensions

Model W x D x H mm (in)

AT-GS950/10PS 330 mm x 200 mm x 44 mm

(13.0 in x 7.9 in x 1.7 in)

AT-GS950/16PS 440 mm x 250 mm x 44 mm

(17.3 in x 9.4 in x 1.7 in)

AT-GS950/28PS 440 mm x 250 mm x 44 mm

(17.3 in x 9.4 in x 1.7 in)

AT-GS950/48PS 440 mm x 430 mm x 44 mm

(17.3 in x 17.0 in x 1.7 in)

Table 11. Chassis Weight

Model Weight kg (lbs)

AT-GS950/10PS 1.90 kg (4.20 lbs)
AT-GS950/16PS 3.56 kg (7.85 lbs)
AT-GS950/28PS 3.75 kg (8.28 lbs)

69

Appendix A: Technical Specifications

AT-GS950/48PS 6.62 kg (14.60 lbs)

Environmental Specifications

Operating Temperature 0° C to 45° C (32° F to 113° F)
Storage Temperature -25° C to 70° C (-13° F to 158° F)
Operating Humidity 5% to 90% non-condensing
Storage Humidity 5% to 95% non-condensing
Operating Altitude Range Up to 2,000 m (6,562 ft)

Table 11. Chassis Weight (Continued)

Model Weight kg (lbs)

Table 12. Environmental Specifications

Power Specifications

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

PoE Specifications

The maximum number of ports that the GS950/PS Series switches will
support when only one class of service is required from the powered
devices connected to the PoE ports is shown in Table 14 on page 71.

Table 13. Max AC Input Power Specifications

AT-GS950/10PS 92.7 W
AT-GS950/16PS 228.5 W
AT-GS950/28PS 238.0 W
AT-GS950/48PS 446.0 W

70

GS950/PS Series Switches Installation Guide

Table 14. Max Ports Supported per PoE Class

Max PoE

Switch PoE Ports

AT-GS950/10PS Ports 1 - 8 75 W 8 Ports 4 Ports 2 Ports
AT-GS950/16PS Ports 1 - 16 185 W 16 Ports 12 Ports 6 Ports
AT-GS950/28PS Ports 1 - 24 185 W 24 Ports 20 Ports 4 Ports
AT-GS950/48PS Ports 1 - 24 370 W 24 Ports 24 Ports 12 Ports

Power

Available

Class 2

IEEE 802.3af

(7W per Port)

Class 3

IEEE 802.3af

(15.4W per Port)

Class 4

IEEE 802.3at

(30W per Port)

Safety and Electromagnetic Emissions Certifications

Table 15. Safety and Electromagnetic Emissions Certifications

FCC Part 15 Class A

RFI Emissions

Immunity EN55024

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

Electrical Safety EN60950 (TUV) T-Mark, UL

Environmental Compliance EU-RoHS compliant, WEEE

Connectors and Port Pinouts

This section lists the connectors and connector pinouts.
Figure 39 illustrates the pin layout for an RJ-45 connector and port.

Figure 39. RJ-45 Connector and Port Pin Layout

60950 (

China RoHS compliant

CULUS

), C-TICK, CE

71

Appendix A: Technical Specifications

Table 16 lists the RJ-45 pin signals when a twisted pair port is operating in
the MDI configuration.

Table 16. MDI Pin Signals (10Base-T or 100Base-TX)

Pin Signal

1TX+
2TX­3RX+
6RX-

Table 17 lists the RJ-45 port pin signals when a twisted pair port is
operating in the MDI-X configuration.

Table 17. MDI-X Pin Signals (10Base-T or 100Base-TX)

Pin Signal

1RX+
2RX­3TX+
6TX-

Table 18 lists the RJ-45 connector pins and their signals when a
1000Base-T port is operating at 1000 Mbps.

Table 18. 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 RX-

72

7 4 TX and RX+
8 4 TX and RX-