Page 1
Layer 2 Gigabit
Ethernet Switch
AT-GS900/8POE
Installation Guide
613-000414 Rev. D
Page 2
Copyright © 2008 Allied Telesis, Inc.
All rights reserved. No part of this publication may be reproduced without prior written permission from Allied Telesis, Inc.
Allied Telesis is a trademark of Allied Telesis, Inc. Microsoft and Internet Explorer are registered trademarks of Microsoft Corporation.
Netscape Navigator is a registered trademark of Netscape Communications Corporation. All other product names, company names, logos or
other designations mentioned herein are trademarks or registered trademarks of their respective owners.
Allied Telesis, Inc. reserves the right to make changes in specifications and other information contained in this document without prior
written notice. The information provided herein is subject to change without notice. In no event shall Allied Telesis, Inc. be liable for any
incidental, special, indirect, or consequential damages whatsoever, including but not limited to lost profits, arising out of or related to this
manual or the information contained herein, even if Allied Telesis, Inc. has been advised of, known, or should have known, the possibility of
such damages.
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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 complies with Canadian ICES-003.
Cet appareil numérique de la classe A est conforme à la norme NMB-003 du Canada.
European Union Restriction of the Use of Certain Hazardous Substances
(RoHS) in Electrical and Electronic Equipment
This Allied Telesis RoHS-compliant product conforms to the European Union Restriction of the Use of Certain Hazardous
Substances (RoHS) in Electrical and Electronic Equipment. Allied Telesis ensures RoHS conformance by requiring
supplier Declarations of Conformity, monitoring incoming materials, and maintaining manufacturing process controls.
RFI Emissions FCC Class A, EN55022 Class A, EN61000-3-2, EN61000-3-3, VCCI
Class A, C-TICK, 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 (TUV), UL 60950 (
CULUS
)
Laser Safety EN60825
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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 and on the documentation CD shipped with this product.
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Contents
Preface ................................................................................................................................................................................11
Safety Symbols Used in this Document................................................................................................................................12
Where to Find Web-based Guides .......................................................................................................................................13
Contacting Allied Telesis ......................................................................................................................................................14
Online Support ..............................................................................................................................................................14
Email and Telephone Support .......................................................................................................................................14
Returning Products........................................................................................................................................................14
For Sales or Corporate Information...............................................................................................................................14
Warranty........................................................................................................................................................................14
Chapter 1: Overview ..........................................................................................................................................................15
Features ...............................................................................................................................................................................16
Port Descriptions ..................................................................................................................................................................17
Twisted Pair Ports .........................................................................................................................................................17
SFP Combo Port ...........................................................................................................................................................18
LEDs.....................................................................................................................................................................................19
Power Supply .......................................................................................................................................................................21
Power over Ethernet.............................................................................................................................................................22
Power Budgeting ...........................................................................................................................................................22
Implementation..............................................................................................................................................................23
Ethernet Switching Basics ....................................................................................................................................................24
MAC Address Table ......................................................................................................................................................24
Duplex Mode .................................................................................................................................................................24
Store and Forward.........................................................................................................................................................25
Back Pressure and Flow Control...................................................................................................................................26
Network Topologies..............................................................................................................................................................27
Power Workgroup Topology ..........................................................................................................................................27
PoE Network Topology..................................................................................................................................................28
Chapter 2: Installation .......................................................................................................................................................29
Reviewing Safety Precautions..............................................................................................................................................30
Selecting a Site for the Switch..............................................................................................................................................32
Planning the Installation ......................................................................................................
Unpacking the Switch ...........................................................................................................................................................34
Installing the Switch on a Table or Desktop..........................................................................................................................35
Mounting the Switch on a Wall .............................................................................................................................................36
Installing the Switch in a Rack ..............................................................................................................................................38
Installing an Optional SFP Transceiver ................................................................................................................................41
Cabling and Powering on the Switch....................................................................................................................................43
Cabling the Twisted Pair Ports ......................................................................................................................................43
Cabling an SFP Transceiver .........................................................................................................................................44
Powering on the Switch.................................................................................................................................................45
Chapter 3: Troubleshooting ..............................................................................................................................................47
PWR LED is Off....................................................................................................................................................................47
LNK/ACT Port LED is Off......................................................................................................................................................47
PD ERROR LED is On .........................................................................................................................................................48
Appendix A: Technical Specifications .............................................................................................................................49
Physical Specifications .........................................................................................................................................................49
Environmental Specifications................................................................................................................................................49
.................................................33
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Contents
Power Specifications.............................................................................................................................................................49
Safety and Electromagnetic Emissions Certifications...........................................................................................................50
RJ-45 Twisted Pair Port Connectors.....................................................................................................................................51
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Figures
Figure 1. AT-GS900/8POE Gigabit Ethernet Switch Front and Back Panels ......................................................................16
Figure 2. SFP Transceiver...................................................................................................................................................18
Figure 3. Power Workgroup Topology.................................................................................................................................27
Figure 4. PoE Network Topology.........................................................................................................................................28
Figure 5. Attaching the Rubber Feet ...................................................................................................................................35
Figure 6. Attaching Brackets for Wall Mounting...................................................................................................................36
Figure 7. Mounting the Switch on the Wall ..........................................................................................................................37
Figure 8. Attaching the Mounting Brackets..........................................................................................................................38
Figure 9. Mounting the Switch on the Rack.........................................................................................................................39
Figure 10. Inserting the SFP................................................................................................................................................42
Figure 11. Connecting the Twisted Pair Data Cables..........................................................................................................43
Figure 12. Removing the Dust Cover from the SFP Transceiver ........................................................................................44
Figure 13. Connecting Fiber Optic Cables to the SFP Transceiver.....................................................................................45
Figure 14. Connecting the AC Power Cord .........................................................................................................................45
Figure 15. RJ-45 Connector and Port Pin Layout................................................................................................................51
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Figures
8
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Tables
Table 1. Safety Symbols .....................................................................................................................................................12
Table 2. System LED ..........................................................................................................................................................19
Table 3. Twisted Pair Port LEDs .........................................................................................................................................19
Table 4. SFP Port LED .......................................................................................................................................................20
Table 5. IEEE 802.3af Class vs. Power Levels ..................................................................................................................23
Table 6. Twisted Pair Cabling and Distances .....................................................................................................................33
Table 7. MDI Pin Signals (10Base-T or 100Base-TX) ........................................................................................................51
Table 8. MDI-X Pin Signals (10Base-T or 100Base-TX) ....................................................................................................51
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Tables
10
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Preface
This guide provides the hardware installation instructions for your
AT-GS900/8POE Fast Ethernet switch. This preface contains the following
sections:
“Safety Symbols Used in this Document” on page 12
“Where to Find Web-based Guides” on page 13
“Contacting Allied Telesis” on page 14
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Preface
Safety Symbols Used in this Document
This document uses the safety symbols defined in Table 1.
Table 1. Safety Symbols
Symbol Meaning Description
Caution Performing or omitting a specific action may
result in equipment damage or loss of data.
Warning Performing or omitting a specific action may
result in electrical shock.
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Where to Find Web-based Guides
The installation and user guides for all Allied Telesis products are available
in portable document format (PDF) on our web site at
www.alliedtelesis.com. You can view the documents online or download
them onto a local workstation or server.
AT-GS900/8POE Fast Ethernet Switch Installation Guide
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Preface
Contacting Allied Telesis
This section provides Allied Telesis contact information for technical
support as well as sales or corporate information.
Online Support You can request technical support online by accessing the Allied Telesis
Knowledge Base from the following web site:
www.alliedtelesis.com/support. You can use the Knowledge Base to
submit questions to our technical support staff and review answers to
previously asked questions.
Email and
Telephone
Support
Returning
Products
For Sales or
Corporate
For Technical Support via email or telephone, refer to the Allied Telesis
web site: www.alliedtelesis.com. Select your country from the list
displayed on the website. Then select the appropriate menu tab.
Products for return or repair must first be assigned a Return Materials
Authorization (RMA) number. A product sent to Allied Telesis without a
RMA number will be returned to the sender at the sender’s expense.
To obtain an RMA number, contact the Allied Telesis Technical Support
group at our web site: www.alliedtelesis.com/support/rma. Select your
country from the list displayed on the website. Then select the appropriate
menu tab.
You can contact Allied Telesis for sales or corporate information at our
web site: www.alliedtelesis.com. Select your country from the list
displayed on the website. Then select the appropriate menu tab.
Information
Warranty The AT-GS900/8POE has a Lifetime Warranty (two years fan and PSU).
Go to www.alliedtelesis.com/warranty for the specific terms and
conditions of the warranty and for warranty registration.
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Chapter 1
Overview
This chapter contains the follows sections:
“Features” on page 16
“Port Descriptions” on page 17
“LEDs” on page 19
“Power Supply” on page 21
“Power over Ethernet” on page 22
“Ethernet Switching Basics” on page 24
“Network Topologies” on page 27
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Chapter 1: Overview
960
POWER
1234 5678R
PoE
CLASS 1
LASER PRODUCT
1000Base-X
AT-GS900/8POE
8 Port 10/100/1000 Mbps POE Switch with 1 Combo SFP Port
PD ON
PD ERROR
1000 LINK
ACT
10/100 LINK
ACT
PORT ACTIVITY
8
SFP
961
100-240VAC~
10/100/1000Base-T Twisted Pair Port LEDs
SFP Port (Uplink Port)
Uplink Port LED
10/100/1000Base-T Twisted Pair Ports
Power LED
AC Power Connector
Features
The AT-GS900/8POE Gigabit Ethernet switch is an unmanaged switch
with the following features:
Eight Auto-Negotiating 10/100/1000Base-T twisted pair ports with
Power over Ethernet (PoE) capability
One small form-factor pluggable (SFP) port to use as an uplink port
System and port LEDs
Power over Ethernet, IEEE 802.3af
The AT-GS900/8POE Gigabit Ethernet switch can be used on a desktop,
mounted to a wall, or mounted in a rack. The switch is easy to install and
does not require software configuration or management.
Figure 1 illustrates the front and back panels of the AT-GS900/8POE
Gigabit Ethernet switch.
Figure 1. AT-GS900/8POE Gigabit Ethernet Switch Front and Back
Panels
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Port Descriptions
Note
AT-GS900/8POE Gigabit Ethernet Switch Installation Guide
The following sections describe the types of ports on the AT-GS900/8POE
Gigabit Ethernet switch:
“Twisted Pair Ports,” next
“SFP Combo Port” on page 18
Twisted Pair
Ports
The AT-GS900/8POE Gigabit Ethernet switch features eight 10/100/
1000Base-T twisted pair ports.
The twisted pair ports feature 8-pin RJ-45 connectors. For the port pinouts,
refer to “RJ-45 Twisted Pair Port Connectors” on page 51.
The ports are 10Base-T, 100Base-T, and 1000Base-TX compliant and are
capable of 10 megabits per second (Mbps), 100 Mbps, and 1000 Mbps
speeds. The ports are IEEE 802.3u Auto-Negotiation compliant. With
Auto-Negotiation, the switch automatically matches the highest possible
common speed between each switch port and each end node. For
example, if an end node is capable of only 100 Mbps, the switch sets the
port connected to the end node to 100 Mbps.
Each twisted pair port on the switch can operate in either half- or full
duplex mode. The twisted pair ports are IEEE 802.3u-compliant and will
Auto-Negotiate the duplex mode setting.
In order for the switch to set the duplex mode for each port correctly,
the end nodes that you connect to the switch ports should also use
Auto-Negotiation. Otherwise, a duplex mode mismatch can occur,
affecting network performance.
Each twisted pair port has a maximum operating distance of 100 m
(328 feet).
For 10 Mbps operation, Category 3 or better 100 ohm shielded or
unshielded twisted pair cabling is required. For 100 or 1000 Mbps
operation, Category 5 and Enhanced Category 5 (5E) 100 ohm shielded or
unshielded twisted pair cabling is required.
All of the twisted pair ports on the switch are auto-MDI and IEEE 802.3abcompatible. When a port's speed and duplex mode are set through AutoNegotiation, the port uses the auto-MDI feature to automatically configure
itself as MDI or MDI-X when connected to an end node. Consequently,
you can use either a straight-through or crossover twisted pair cable when
connecting any network device to a port.
The ports can operate as either standard 10/100/1000Base-T ports or as
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Chapter 1: Overview
Note
Note
PoE ports.
SFP Combo Port The AT-GS900/8POE Gigabit Ethernet switch has one SFP port that can
accommodate an optional Small Form-factor Pluggable (SFP) transceiver.
The AT-GS900/8POE Gigabit Ethernet switch has one SFP combo port
(Port 8) that can accommodate one optional Small Form-factor Pluggable
(SFP) transceiver module. The copper redundant port (Port 8R) becomes
the redundant/standby port when the link on Port 8 is lost.
An SFP module is a fast and easy way for you to add a 1000 Mbps fiber
optic port to your Gigabit PoE switch. You can use the module to extend
the distance of your network, build a high-speed backbone network
between switches, or connection additional end-nodes to the network,
such as high-speed servers.
The SFP transceiver is a fast and easy way for you to add an 1000 Mbps
fiber optic uplink port to your Fast Ethernet switch. You can use the SFP to
extend the distance of your network, build a high-speed backbone network
between switches, or connect additional end nodes to the network, such
as high-speed servers.
Figure 2 shows an example of an SFP transceiver.
Figure 2. SFP Transceiver
The SFP transceiver only supports Gigabit operation and works
independently without taking any port priority.
For a list of the SFP transceiver modules supported by the
AT-GS900/8POE Gigabit Ethernet switch switch, contact your Allied
Telesis sales representative or refer to our web site at
www.alliedtelesyn.com.
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LEDs
AT-GS900/8POE Gigabit Ethernet Switch Installation Guide
The system and port LEDs on the front panel of the AT-GS900/8POE
Gigabit Ethernet switch switch display the switch and its port status
information.
Table 2 describes the system LED.
Table 2. System LED
LED State Description
PWR Green The switch is powered ON and operating
normally.
OFF The switch has no power.
Each twisted pair port has two LEDs, as described in Table 3.
Table 3. Twisted Pair Port LEDs
LED State Description
L/A Green A valid 1000 Mbps link is established on the
port.
Blinking Green Frames are being transmitted/received on
the port at 1000 Mbps.
Amber A valid 10/100 Mbps link is established on
the port.
Blinking Amber Frames are being transmitted/received on
the port at 10 or 100 Mbps.
Off No link is established on the port.
PoE Green A PoE powered device is connected and
power is being powered by the port.
Blinking Green PoE is off because an error occurred on the
powered device connected to the port.
OFF The port is not connecting to a valid powered
device.
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Chapter 1: Overview
Table 4 describes the SFP port LED.
Table 4. SFP Port LED
LED State Description
L/A Green A valid link is established on the SFP module
in the SFP expansion slot.
Blinking
Green
Frames are being transmitted/received on the
SFP module in the SFP expansion slot.
OFF No link is established on the SFP module in the
SFP expansion slot.
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Power Supply
Note
AT-GS900/8POE Gigabit Ethernet Switch Installation Guide
The AT-GS900/8POE Gigabit Ethernet switch has an internal power
supply with a single AC power supply socket on the back panel which
features autoswitch AC inputs. To power the switch on or off, connect or
disconnect the power cord provided with the switch.
For the power requirements, refer to “Power Specifications” on
page 49.
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Chapter 1: Overview
Power over Ethernet
The twisted pair ports on the AT-GS900/8POE Gigabit Ethernet switch
feature Power over Ethernet (PoE). PoE is a mechanism for supplying
power to network devices over the same twisted pair cables used to carry
network traffic. This feature can simplify network installation and
maintenance by allowing you to use the switch as a central power source
for other network devices.
A device that receives its power over an Ethernet cable is called a
powered device. Examples of such devices can be wireless access points,
IP telephones, web cams, and even other Ethernet switches. An example
of the latter is the unmanaged AT-FS705PD Ethernet switch from Allied
Telesis. A powered device connected to a port on the switch will receive
both network traffic and power over the same twisted pair cable.
There are several advantages that the PoE feature of the AT-GS900/
8POE Gigabit Ethernet switch adds to the installation and maintenance of
your network. First, because the switch acts as the central power source
for your powered devices, adding an uninterruptible power source (UPS)
to the switch increases the protection not just to the switch itself from
possible power source problems but also to all of the powered devices
connected to it. This can increase the reliability of your network by
minimizing the impact to network operations from a power failure.
PoE can also simplify the installation of your network. A frequent issue in
selecting a location for a network device is whether there is a power
source nearby. This often limits equipment placement or requires the
added cost and time of having additional electrical sources installed. With
PoE, you can install PoE-compatible network equipment wherever they
are needed without having to worry about whether they are near a power
source.
The switch automatically determines whether or not a device connected to
a port is a powered device. A powered device has a signature resistor or
signature capacitor that the switch can detect over the Ethernet cabling. If
the resistor or capacitor is present, the switch assumes that the device is a
powered device.
Power Budgeting The AT-GS900/8POE Gigabit Ethernet switch provides a maximum of
15.4 W of power per port on four of the eight ports for a total power
consumption of 65 W, while at the same time furnishing standard 10/100
Mbps Ethernet functionality.
The AT-GS900/8POE smart power management functionality supports
any combination of Ethernet ports (1-8) that supply power for IEEE
802.3af Class 0, 1, 2, or 3 powered devices up to a maximum of 65 watts,
as described in Table 5.
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AT-GS900/8POE Gigabit Ethernet Switch Installation Guide
Note
Power is supplied to the powered devices in the order that the ports
are connected or on a first-come-first-served basis until the 65 watt
limit is reached. If the switch is power cycled after the PoE devices
are connected to the switch ports, the power is supplied to ports 1
through 8 in that order.
Table 5. IEEE 802.3af Class vs. Power Levels
Class Usage
Minimum Power
Levels Output at
the PSE
Maximum Power
Levels Output at
the PD
0 Default 15.4W 0.44W to 12.95W
1 Optional 4.0W 0.44W to 3.84W
2 Optional 7.0W 3.84W to 6.49W
3 Optional 15.4W 6.49W to 12.95W
A port connected to a network node that is not a powered device (that is, a
device that receives its power from another power source) functions as a
regular Ethernet port, without PoE. The PoE feature remains enabled on
the port but no power is delivered to the device.
Implementation A standard Ethernet twisted pair cable contains four pairs of strands for a
total of eight strands. 10/100 Mbps network traffic requires only four
strands (1, 2, 3, and 6), leaving four strands in the cable unused (4, 5, 7,
and 8). 1000 Mbps network traffic uses all eight strands.
The PoE standard, IEEE 802.3af, describes two alternative ways for
delivering power to a powered device (PD) over twisted pair cabling.
Alternative A uses the same strands that carry the network traffic.
Alternative B uses the spare strands. The PoE implementation on the
AT-GS900/8POE Gigabit Ethernet switch is Alternative A, where power is
transmitted over strands 1, 2, 3, and 6.
PD’s that comply with the IEEE 802.3af standard typically support both
power delivery methods. If a PD is compliant with the standard, it should
be able to receive its power from the switch while using either a straight or
cross-over cable. The PoE feature on the AT-GS900/8POE Gigabit
Ethernet switch should also work with most legacy PD’s as long as the
device can be powered on pins 1, 2, 3, and 6. A legacy device is a node
that was manufactured before the IEEE 802.3af standard was completed
and, consequently, may not adhere to the standard. If this is the case, a
cross-over (MDI-X) cable may be needed to insure that the DC polarity is
correct.
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Chapter 1: Overview
Ethernet Switching Basics
An Ethernet switch interconnects network devices, such as workstations,
printers, routers, and other Ethernet switches, so that they can
communicate with each other by sending and receiving Ethernet frames.
MAC Address
Table
Every hardware device on your network has a unique MAC address. This
address is assigned to the device by the device’s manufacturer. For
example, when you install a Network Interface Card (NIC) in a computer
so that you can connect it to the network, the NIC already has a MAC
address assigned to it by its manufacturer.
The MAC address table in the AT-GS900/8POE Gigabit Ethernet switch
can store up to 8K MAC addresses. The switch uses the table to store the
MAC addresses of the network end nodes connected to the ports, along
with the port number on which each address was learned.
A switch learns the MAC addresses of the end nodes by examining the
source address of each packet received on a port. It adds the address and
port on which the packet was received to the MAC table if the address had
not already been entered in the table. The result is a table that contains all
the MAC addresses of the devices that are connected to the switch’s
ports, and the port number where each address was learned.
When the switch receives a packet, it also examines the destination
address and, by referring to its MAC address table, determines the port on
which the destination end node is connected. It then forwards the packet
to the appropriate port and on to the end node. This increases network
bandwidth by limiting each frame to the appropriate port when the
intended end node is located, freeing the other switch ports for receiving
and transmitting data.
If the switch receives a packet with a destination address that is not in the
MAC address table, it floods the packet to all the ports on the switch. If the
ports have been grouped into virtual LANs, the switch floods the packet
only to those ports which belong to the same VLAN as the port on which
the packet was received. This prevents packets from being forwarded into
inappropriate LAN segments, decreasing network security. When the
destination end node responds, the switch adds its MAC address and port
number to the table.
If the switch receives a packet with a destination address that is on the
same port on which the packet was received, it discards the packet
without forwarding it on to any port. Since both the source end node and
the destination end node for the packet are located on the same port on
the switch, there is no reason for the switch to forward the packet.
Duplex Mode Duplex mode refers to how an end node receives and transmits data. If an
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AT-GS900/8POE Gigabit Ethernet Switch Installation Guide
Note
end node can receive or transmit data, but not both simultaneously, the
end node is operating in what is referred to as half-duplex mode. If an end
node can both receive and transmit data simultaneously, the end node is
said to be operating in full-duplex mode. Naturally, an end node capable of
operating in full-duplex can handle data much faster than an end node that
can only operate in half-duplex mode.
The twisted pair ports on the AT-GS900/8POE Gigabit Ethernet switch
switch can operate in either half-or full-duplex mode. They are IEEE
802.3u-compliant and use Auto-Negotiation to set the duplex mode setting
for you automatically.
For Auto-Negotiation to operate properly on a switch, the end nodes
connected to the switch should also use Auto-Negotiation. If an end node
does not have this feature and has a fixed duplex mode of full-duplex, the
result will be a duplex mode mismatch between the end node and a switch
port. A port on the Gigabit Ethernet switch connected to an end node with
a fixed duplex mode of full-duplex will operate at only half-duplex. This
results in the end node using full-duplex and the switch port using halfduplex. This can produce network performance problems. If you encounter
this situation, you must configure the port on the end node to use AutoNegotiation or, if it lacks that feature, to half-duplex.
Store and
Forward
Because the ports on the AT-GS900/8POE Gigabit Ethernet switch
operate in Auto-Negotiate mode only, the end nodes connected to
the switch must also be configured to operate in the Auto-Negotiate
mode. If an end node is configured to a specific duplex setting in a
manual mode, it will not respond to the Auto-Negotiate protocol from
the AT-GS900/8POE Gigabit Ethernet switch. (The speed is
determined from the link pulses, however, so the speed is always
detected correctly.) As a result, the port setting on the switch will end
up at half-duplex. If the end node is manually configured to fullduplex, there will be a duplex mismatch and data will be lost. If the
end node is manually configured to half-duplex, both ports will have
the speed and duplex match up correctly.
The AT-GS900/8POE Gigabit Ethernet switch uses store and forward as
the method for receiving and transmitting frames. When a Ethernet frame
is received on a switch port, the switch does not retransmit the frame out
the destination port until it has received the entire frame and stored the
frame in a port buffer. It then examines the frame to determine if it is a
valid frame. Invalid frames, such as fragments or runts, are discarded by
the switch. This insures that only valid frames are transmitted out the
switch ports and that damaged frames are not propagated on your
network.
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Chapter 1: Overview
Back Pressure
and Flow Control
To maintain the orderly movement of data between the end nodes, an
Ethernet switch may periodically need to signal an end node to stop
sending data. This can occur under several circumstances. For example, if
two end nodes are operating at different speeds, the switch, while
transferring data between the end nodes, might need to instruct the faster
end node to stop transmitting data to allow the slower end node to catch
up. An example of this is when a server operating at 1000 Mbps is sending
data to a workstation operating at only 100 Mbps.
How a switch signals an end node to stop transmitting data differs
depending on the speed and duplex mode of the end node and switch
port. A twisted pair port operating at 100 Mbps and half-duplex mode will
stop an end node from transmitting data by forcing a collision. A collision
on an Ethernet network occurs when two end nodes attempt to transmit
data using the same data link at the same time. A collision causes end
nodes to stop sending data. When the switch needs to stop a 100 Mbps,
half-duplex end node from transmitting data, it forces a collision on the
data link, which stops the end node. When the switch is ready to receive
data again, the switch stops forcing collisions. This is referred to as back
pressure.
A port operating at 100 Mbps and full-duplex mode uses PAUSE frames,
as specified in the IEEE 802.3x standard, to stop the transmission of data
from an end node. Whenever the switch wants an end node to stop
transmitting data, it issues this frame. The frame instructs the end node to
cease transmission. The switch continues to issue PAUSE frames until it
is ready again to receive data from the end node. This is referred to as
flow control.
The AT-GS900/8POE Gigabit Ethernet switch supports back pressure
flow control in half duplex mode and pause frame flow control in full duplex
mode.
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Network Topologies
Legend
10 Mbps
100 Mbps
AT-GS900/8POE Gigabit PoE Switch
1000 Mbps
This section illustrates two network topologies that you can create with the
AT-GS900/8POE Gigabit PoE switch: a power workgroup and collapsed
backbone.
AT-GS900/8POE Gigabit Ethernet Switch Installation Guide
Power
Workgroup
Topology
The topology shown in Figure 3 is commonly referred to as a power
workgroup topology. Each workstation or end-node is connected directly to
a port on the switch. Each end-node has a dedicated data link to the
switch for best performance and reliability. The devices can operate at
10 Mbps, 100 Mbps, or 1000 Mbps.
AT-GS900/8POE
8 Port 10/100/1000 Mbps POE Switch with 1 Combo SFP Port
1234 5678R
POWER
PoE
PORT ACTIVITY
1000 LINK
10/100 LINK
PD ON
ACT
ACT
PD ERROR
SFP
8
1000Base-X
LASER PRODUCT
CLASS 1
962
Figure 3. Power Workgroup Topology
27
Page 28
Chapter 1: Overview
POWER
12345678R
PoE
CLASS 1
LASER PRODUCT
1000Base-X
AT-GS900/8POE
8 Port 10/100/1000 Mbps POE Switch with 1 Combo SFP Port
PD ON
PD ERROR
1000 LINK
ACT
10/100 LINK
ACT
PORT ACTIVITY
8
SFP
Access Point
Access Point
IP Camera
-GS900/8POEAT
AT-9424T
1 3 5 7 9 11 13 15 17 19 21R 23R
2 4 6 8 10 12 14 16 18 20 22R 24R
CLASS 1
LASER PRODUCT
AT-9424T
1 3 5 7 9 11 13 15 17 19 21R 23R
2 4 6 8 10 12 14 16 18 20 22R 24R
TERMINAL
PORT
FAULT
MASTER
POWER
STATUS
SFP
21 22 23 24
L/A
D/C
D/C
L/A
D/C
L/A
1000 LINK / ACT
HDX /
COL
FDX
10/100 LINK / ACT
PORT ACTIVITY
21
22
23
24
SFP
L/A
Gigabit Ethernet Switch
10/100/1000T-POE
SFP
963
PoE Network
Topology
In the topology shown in Figure 4, an AT-GS900/8POE Gigabit Ethernet
switch is connected to an AT-9424T/SP Gigabit Ethernet Switch and a
number of POE powered devices in different locations.
Figure 4. PoE Network Topology
28
Page 29
Chapter 2
Installation
This chapter contains the following sections:
“Reviewing Safety Precautions” on page 30
“Selecting a Site for the Switch” on page 32
“Planning the Installation” on page 33
“Unpacking the Switch” on page 34
“Installing the Switch on a Table or Desktop” on page 35
“Mounting the Switch on a Wall” on page 36
“Installing the Switch in a Rack” on page 38
“Installing an Optional SFP Transceiver” on page 41
“Cabling and Powering on the Switch” on page 43
29
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Chapter 2: Installation
Note
Reviewing Safety Precautions
Review the following safety precautions before you begin to install the
AT-GS900/8POE Gigabit Ethernet switch.
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 and on the
documentation CD shipped with this product.
Warning: Class 1 Laser product.
Warning: Do not stare into the laser beam. L2
L 1
Warning: To prevent electric shock, do not remove the cover.
No user-serviceable parts inside. This unit contains hazardous
voltages and should only be opened by a trained and qualified
technician. To avoid the possibility of electric shock, disconnect
electric power to the product before connecting or disconnecting
E1
E2
E5
E3
E4
the LAN cables.
Warning: Do not work on equipment or cables during periods of
lightning activity.
Warning: Power cord is used as a disconnection device. To deenergize equipment, disconnect the power cord.
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.
Pluggable Equipment. The socket outlet shall be installed near
the equipment and shall be easily accessible.
Caution: Air vents must not be blocked and must have free
access to the room ambient air for cooling.
E6
30
Page 31
AT-GS900/8POE Gigabit Ethernet Switch Installation Guide
Warning: Operating Temperature. This product is designed for a
maximum ambient temperature of 40° degrees C.
All Countries: Install product in accordance with local and
E25
E8
E15
National Electrical Codes.
Caution: The attached mounting brackets must be used to
securely mount the device on the wall.
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.
Warning: Mounting of the equipment in the rack should be such
that a hazardous condition is not created due to uneven
mechanical loading.
E21
E7
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
Caution: 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.
Warning: Reliable earthing of rack-mounted equipment should
be maintained. Particular attention should be given to supply
connections other than direct connections to the branch circuits
(e.g., use of power strips).
Warning: 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.
E37
E36
E40
31
Page 32
Chapter 2: Installation
Selecting a Site for the Switch
Observe the following requirements when choosing a site for the
AT-GS900/8POE Gigabit Ethernet switch:
If you plan to install the switch in an equipment rack, be sure that the
rack is safely secured and that it will not tip over. Devices in a rack
should be installed starting at the bottom, with the heavier devices
near the bottom of the rack.
If you are installing the switch on a table, be sure 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 easy for you to connect and disconnect
cables, as well as view the switch’s LEDs.
To allow proper cooling of the switch, air flow around the unit and
through its vents on the side and rear should not be restricted.
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.
32
Page 33
Planning the Installation
Note
Table 6 contains the cabling specifications for the twisted pair ports.
Speed Type of Cable
AT-GS900/8POE Gigabit Ethernet Switch Installation Guide
Table 6. Twisted Pair Cabling and Distances
Maximum
Operating
Distance
10 Mbps Category 3 or better 100-ohm shielded
or unshielded twisted pair cable
100 or
1000 Mbps
The twisted pair ports on the switch feature auto-MDI when
operating at 10 or 100 Mbps. Each port is individually configured as
MDI or MDI-X when connected to an end node. Therefore, you can
use either a straight-through or crossover twisted pair cable when
connecting any network device to a twisted pair port on the switch. A
port operating at 10 or 100 Mbps uses four of the eight strands in
twisted pair wiring. A port operating at 1000 Mbps uses all eight
strands.
Category 5 or Category 5E (Enhanced)
100-ohm shielded or unshielded twisted
pair cable
100 m (328 ft)
100 m (328 ft)
33
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Chapter 2: Installation
Note
Unpacking the Switch
To unpack an AT-GS900/8POE Gigabit Ethernet switch, perform the
following procedure:
1. Remove all components from the shipping package.
2. Place the switch on a level, secure surface.
3. Ensure the following hardware components are included in your switch
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.
package. If any item is missing or damaged, contact your Allied
Telesis sales representative for assistance.
Two mounting brackets (for either wall- or rack-mounting)
Six mounting bracket screws
Four self-adhesive rubber feet (for desktop use)
One AC power cord
Documentation CD
34
Page 35
Installing the Switch on a Table or Desktop
To install the switch on a table or desktop, perform the following
procedure:
1. Remove all the items from the packaging and store the packaging
material in a safe place. In the event a problem occurs and you need to
return the unit, please use as much of the original shipping material as
possible.
2. Attach the four self-adhesive rubber feet to the bottom of the switch, as
shown in Figure 5.
AT-GS900/8POE Gigabit Ethernet Switch Installation Guide
8
1000Base-X
SFP
PD ON
PD ERROR
10/100 LINK
ACT
1000 LINK
ACT
PORT ACTIVITY
PoE
1234 5678R
964
LASER PRODUCT
CLASS 1
Figure 5. Attaching the Rubber Feet
3. Place the switch on a flat and secure surface, leaving ample space
around the switch for ventilation.
Refer to “Cabling and Powering on the Switch” on page 43 to complete
the installation.
POWER
8 Port 10/100/1000 Mbps POE Switch with 1 Combo SFP Port
AT-GS900/8POE
35
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Chapter 2: Installation
Caution
Caution
777
967
P
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Mounting the Switch on a Wall
You can mount the AT-GS900/8POE Gigabit Ethernet switch on the wall
in a vertical position using the mounting brackets that are shipped with the
switch. The wall-mounting screws, plastic anchors, and other materials
necessary to mount the switch on a wall are not provided.
To mount the switch on a wall, perform the following procedure:
1. If attached, remove the rubber feet using a flat-head screwdriver.
2. Select a wall location for the device.
3. Turn the switch over and attach a mounting bracket (provided) to each
side of the switch using the bracket mounting screws (provided), as
shown Figure 6.
Figure 6. Attaching Brackets for Wall Mounting
The attached mounting brackets must be used to securely mount
the device on the wall. E15
4. Position the switch on the wall with the top of the switch against the
wall and the ports facing up.
Make sure that the AT-GS900/8POE Gigabit Ethernet switch is
always mounted on the wall with the front panel facing up and the
back panel facing down.
36
Page 37
AT-GS900/8POE Gigabit Ethernet Switch Installation Guide
972
P
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1
2
3
4
5678
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CLASS 1
LASER PRODUCT
1000Ba
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AT-GS900/
8POE
8 Port 10/100/1000 Mbps POE
Switch wi
th 1 C
ombo
SFP Por
t
PD
O
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P
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1
0
00
L
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10/100
L
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A
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P
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A
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IV
I
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Y
8
S
F
P
5. Mount the switch on the wall using the wall mounting screws (not
provided), as shown in Figure 7.
Figure 7. Mounting the Switch on the Wall
6. Refer to “Cabling and Powering on the Switch” on page 43 to complete
the installation.
7. To prevent accidental disconnection of the AC power cord, fasten the
power cord to the wall with the appropriate cable fastener hardware
(not provided) within six inches of the AT-GS900/8POE Gigabit
Ethernet switch back panel.
37
Page 38
Chapter 2: Installation
Installing the Switch in a Rack
To install the switch in a rack, perform the following procedure:
1. If attached, remove the rubber feet using a flat-head screwdriver.
2. Attach a mounting bracket (provided) to each side of the switch using
the bracket mounting screws (provided), as shown Figure 8.
AT-GS900/
8 Port 10
/100/1
8POE
000 M
bps
PO
12
E Sw
itch with 1
Comb
E
R
o SFP P
PoE
or
t
3 4567
POW
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PO
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ACTI
VITY
1000 L
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10/
ACT
100
LIN
K
S
F
ACT
P
P
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8
PD
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RR
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100
0B
ase-
X
C
L
A
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A
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SER
S
1
P
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D
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T
965
Figure 8. Attaching the Mounting Brackets
3. Mount the switch on a 19-inch rack using the screws (not provided), as
shown in Figure 9.
AT-FS70
8 po
rt 10/
8/P
100
TX Unmanaged POE
OE
123
Switc
h w
/1
SFP
po
rt
POWER
PoE
4
5
6
7 8
L
I
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A
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P
T
D
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P
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ER
R
U
P
L
IN
K
P
OR
T
SFP
1000Ba
se-X
CLAS
LASER PRODUCT
S 1
776
38
Page 39
AT-GS900/8POE Gigabit Ethernet Switch Installation Guide
Figure 9. Mounting the Switch on the Rack
Warning: To prevent electric shock, do not remove the cover.
No user-serviceable parts inside. This unit contains hazardous
voltages and should only be opened by a trained and qualified
technician. To avoid the possibility of electric shock, disconnect
electric power to the product before connecting or disconnecting
E1
E2
E6
E4
the LAN cables.
Warning: Do not work on equipment or cables during periods of
lightning activity.
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.
Caution: Air vents must not be blocked and must have free
access to the room ambient air for cooling.
Warning: Operating Temperature. This product is designed for a
maximum ambient temperature of 40° degrees C.
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
Warning: Mounting of the equipment in the rack should be such
that a hazardous condition is not created due to uneven
mechanical loading.
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).
E25
E35
E7
Caution: 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
39
Page 40
Chapter 2: Installation
Warning: Reliable earthing of rack-mounted equipment should
be maintained. Particular attention should be given to supply
connections other than direct connections to the branch circuits
(e.g., use of power strips).
E37
Refer to “Cabling and Powering on the Switch” on page 43 to complete
the installation.
40
Page 41
Installing an Optional SFP Transceiver
Note
Note
Note
Note
To install an SFP transceiver in an AT-GS900/8POE Gigabit Ethernet
switch, 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 must install the transceiver before you connect cables to it.
1. Remove the transceiver from its shipping container and store the
packaging material in a safe location.
AT-GS900/8POE Gigabit Ethernet Switch Installation Guide
You must use the original shipping material if you need to return the
module to Allied Telesis.
Warning: 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 the SFP slot.
Unnecessary removal and insertion of a SFP module can lead to
premature failure.
3. Locate the label on the transceiver and turn it so that the label is on top
and the alignment groove is on the bottom.
41
Page 42
Chapter 2: Installation
Note
Note
4. Slide the SFP transceiver into the SFP slot on the switch, as shown in
Figure 10.
7
8R
PORT ACTIVITY
1000 LIN
K
10/1
ACT
00
LINK
ACT
P
D
O
N
PD ERROR
1000Ba
SFP
8
se-
X
CLASS
LASER PRODUCT
1
968
Figure 10. Inserting the SFP
SFP transceivers are dust sensitive. When a fiber optic cable is not
installed, or when you store the SFP, always keep the plug in the
slot. When you do remove the plug, keep it for future use.
Unnecessary removal and insertion of an SFP can lead to
premature failure.
For information about cabling for the SFP, refer to “Cabling an SFP
Transceiver” on page 44.
42
Page 43
Cabling and Powering on the Switch
This section contains the following procedures:
“Cabling the Twisted Pair Ports,” next
“Cabling an SFP Transceiver” on page 44
“Powering on the Switch” on page 45
AT-GS900/8POE Gigabit Ethernet Switch Installation Guide
Cabling the
Twisted Pair
Ports
To connect to the 10/100Base-T twisted pair ports on the AT-FS708/POE
switch, perform the following procedure:
1. Connect the twisted pair data cables to the RJ-45 ports on the switch,
as shown in Figure 11.
AT-G
8 Port 10/100/1000 Mp
S900/
8POE
bs POE
Switch with 1
1
SFP
2
P
OW
E
R
Port
PoE
3
4
5
6
969
Figure 11. Connecting the Twisted Pair Data Cables
2. Power on the end nodes. For more information, refer to “Powering on
the Switch” on page 45.
When connecting a twisted pair cable to a port, observe the following
guidelines:
An RJ-45 connector should fit snugly into the port on the switch.
The tab on the connector should lock the connector into place.
The ports on the switch are auto-MDI/MDI-X. You can use either a
straight-through or crossover twisted pair cable to connect any type
of network device to a port on the switch.
The network should not contain data loops, which can adversely
affect network performance. A data loop exists when two or more
network devices can communicate with each other over more than
one data path.
Warning: 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
43
Page 44
Chapter 2: Installation
Warning
Warning
Note
Note
7 8R
C
L
A
S
S
1
L
A
S
E
R
P
R
O
D
U
C
T
1000Ba
se-
X
PD ON
P
D
E
R
RO
R
1000 LINK
ACT
10/100 LINK
ACT
P
O
RT AC
TIV
ITY
970
8
SFP
Cabling an SFP
Transceiver
To cable an SFP transceiver, perform the following procedure:
Class 1 laser product. L1
Do not stare into the laser beam. L2
For information about the proper cable type, refer to the
documentation that accompanied the SFP transceiver.
Before you install the cable in the SFP transceiver, verify that the
optical power input to the transceiver is within its dynamic range.
1. Remove the dust cover from the SFP transceiver, as shown in
Figure 12.
Figure 12. Removing the Dust Cover from the SFP Transceiver
44
Page 45
AT-GS900/8POE Gigabit Ethernet Switch Installation Guide
7 8R
SFP
C
L
A
S
S
1
L
A
S
E
R
P
R
O
D
U
C
T
1000Ba
se-
X
PD ON
PD
E
RROR
1000 LINK
ACT
10/100 LINK
ACT
P
O
RT
ACTIV
ITY
971
8
SFP
100-240VAC
~
780
2. Connect the fiber optic cable to the SFP transceiver, as shown in
Figure 13.
Figure 13. Connecting Fiber Optic Cables to the SFP Transceiver
3. Power on the end nodes.
Powering on the
Switch
To power on the AT-GS900/8POE Gigabit Ethernet switch, perform the
following procedure:
1. Plug the power cord into the AC power connector on the back panel of
the switch, as shown in Figure 14.
Figure 14. Connecting the AC Power Cord
2. Plug the other end of the power cord into a wall outlet.
Warning: Power cord is used as a disconnection device. To deenergize 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 PWR LED is green.
45
Page 46
Chapter 2: Installation
If the PWR LED is OFF, refer to Chapter 3, “Troubleshooting” on page
47.
The switch is ready for network operations.
46
Page 47
Chapter 3
Note
Troubleshooting
This chapter contains information on how to troubleshoot the switch in the
event that a problem occurs.
If after following the instructions in this chapter you are unable to
resolve the problem, contact Allied Telesis Technical Support for
assistance. Refer to “Contacting Allied Telesis” on page 14 for
contact information.
PWR LED is Off
If the LED is OFF, indicating that the unit is not receiving power, do the
following:
Ensure 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 using a different power cord.
Verify that the voltage from the power source is within the required
levels for your region.
LNK/ACT Port LED is Off
If a LNK/ACT LED is OFF, do the following:
Verify that the end node connected to the port is powered ON and is
operating properly.
Verify that the twisted pair cable is securely connected to the port on
the switch and to the port on the end node.
Ensure that the twisted pair cable does not exceed 100 meters (328
feet).
47
Page 48
Chapter 3: Troubleshooting
Verify that you are using the appropriate category of twisted pair cable:
Category 3 or better for 10 Mbps operation and Category 5 and
Category 5E for 100 Mbps operation.
PD ERROR LED is On
If the PD ERROR LED is on, indicating that there is a connection error to
one of the PoE powered device connected to the switch ports, verify that
the device is powered ON and is operating properly.
48
Page 49
Appendix A
Technical Specifications
Physical Specifications
Dimensions: (W x D x H)
Weight: 1.86 kg (4.1 lbs)
Environmental Specifications
330 mm x 220 mm x 44 mm
(13.0 in x 8.7 in x 1.7 in)
Operating Temperature: 0° C to 40° C (32° F to 104° 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 10,000 feet (3,048 meters)
Power Specifications
AC Voltage/Frequency Requirements: 100 - 240 VAC, 50/60 Hz
AC Input Power Consumption: 90 W maximum
Available Power over Ethernet: 65 W @ 48 VDC
IEEE 802.3af Class 3 (15.4 W): Max 4 ports
IEEE 802.3af Class 2 (7.3 W): Max 8 ports
IEEE 802.3af Mode: Alternative A (MDI-X)
49
Page 50
Appendix A: Technical Specifications
Safety and Electromagnetic Emissions Certifications
EMI FCC Class A, EN55022 Class A, C-TICK
Immunity EN55024
Electrical Safety UL 60950-1 (
), EN 60950-1 (TUV)
CULUS
or VDE, CE
Laser IEC/EN 60825-1, IEC/EN 60825-2
50
Page 51
RJ-45 Twisted Pair Port Connectors
8
8
1
1
This section lists the connectors and connector pinouts for the
AT-GS900/8POE Gigabit PoE switch and its components.
Figure 15 illustrates the pin layout to an RJ-45 connector and port.
Figure 15. RJ-45 Connector and Port Pin Layout
Table 7 lists the RJ-45 pin signals when a twisted pair port is operating in
the MDI configuration.
AT-GS900/8POE Gigabit Ethernet Switch Installation Guide
Table 7. MDI Pin Signals (10Base-T or 100Base-TX)
Pin Signal
1TX+
2TX-
3RX+
6RX-
Table 8 lists the RJ-45 port pin signals when a twisted pair port is
operating in the MDI-X configuration.
Table 8. MDI-X Pin Signals (10Base-T or 100Base-TX)
Pin Signal
1RX+
2RX-
3TX+
6TX-
51
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Appendix A: Technical Specifications
52
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