Page 1
Fast Ethernet
Smart Switch
AT-FS750/24POE
Installation Guide
613-000556 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.
Page 3
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.
RFI Emissions FCC Class A, EN55022 Class A, CISPR 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 EN60950-1 (TUV), UL 60950-1 (
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” (613-000405) posted on the Allied Telesis website at
www.alliedtelesis.com.
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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
Front and Back Panels .........................................................................................................................................................17
Ports .....................................................................................................................................................................................18
Twisted Pair Ports .........................................................................................................................................................18
Uplink Combo Ports ......................................................................................................................................................18
LEDs.....................................................................................................................................................................................20
System LEDs.................................................................................................................................................................20
10/100Base-T POE Port LEDs......................................................................................................................................20
10/100Base-T Non-POE Port LEDs ..............................................................................................................................21
Uplink Combo Port LEDs ..............................................................................................................................................22
Power Supply .......................................................................................................................................................................24
Power over Ethernet.............................................................................................................................................................25
Power Budgeting ...........................................................................................................................................................25
Implementation..............................................................................................................................................................26
Ethernet Switching Basics ....................................................................................................................................................27
MAC Address Table ......................................................................................................................................................27
Duplex Mode .................................................................................................................................................................27
Store and Forward.........................................................................................................................................................28
Back Pressure and Flow Control...................................................................................................................................28
Network Topologies..............................................................................................................................................................30
Power Workgroup Topology ..........................................................................................................................................30
Collapsed Backbone .............................................................................................................
........................................31
Chapter 2: Installation .......................................................................................................................................................33
Reviewing Safety Precautions..............................................................................................................................................34
Selecting a Site for the Switch..............................................................................................................................................36
Cabling .................................................................................................................................................................................37
Unpacking the Switch ...........................................................................................................................................................38
Installing the Switch on a Desktop ........................................................................................................................................39
Installing a Switch in a Rack .................................................................................................................................................40
Installing an Optional SFP Transceiver ................................................................................................................................43
Cabling and Powering On the Switch ...................................................................................................................................45
Connecting the Twisted Pair Cables .............................................................................................................................45
Connecting the Fiber Optic Cables ...............................................................................................................................45
Powering On the Switch ................................................................................................................................................46
Starting a Management Session ..........................................................................................................................................48
Chapter 3: Troubleshooting ..............................................................................................................................................49
Appendix A: Technical Specifications .............................................................................................................................51
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Contents
Physical Specifications .........................................................................................................................................................51
Environmental Specifications................................................................................................................................................51
Power Specifications.............................................................................................................................................................51
Safety and Electromagnetic Emissions Certifications...........................................................................................................52
Connectors and Port Pinouts ................................................................................................................................................52
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Figures
Figure 1: RJ-45 Connector and Port Pin Layout............................................................................................................... 52 7
Figure 2: AT-FS750/24POE Front and Back Panels ........................................................................................................... 17
Figure 3: System LEDs........................................................................................................................................................ 20
Figure 4: POE Port LEDs .................................................................................................................................................... 21
Figure 5: 10/100Base-T Non-PoE Port LEDs...................................................................................................................... 22
Figure 6: Uplink Combo Port LEDs...................................................................................................................................... 22
Figure 7: Power Workgroup Topology................................................................................................................................. 30
Figure 8: Collapsed Backbone - Hub Topology................................................................................................................... 31
Figure 9: Attaching the Rubber Feet ................................................................................................................................... 39
Figure 10: Attaching the Rack-Mount Bracket ..................................................................................................................... 40
Figure 11: Mounting the Switch on the Rack ....................................................................................................................... 40
Figure 12: Removing the Dust Plug from the SFP Slot ....................................................................................................... 43
Figure 13: Inserting the SFP................................................................................................................................................ 44
Figure 14: Connecting the Twisted Pair Data Cables.......................................................................................................... 45
Figure 15: Removing the Dust Plug from the SFP............................................................................................................... 46
Figure 16: Connecting the Fiber Optic Cable ...................................................................................................................... 46
Figure 17: Plugging in the AC Power Cord.......................................................................................................................... 47
Figure 18: AT-S88 Management Software Main Page ........................................................................................................ 48
Figure 19: RJ-45 Connector and Port Pin Layout................................................................................................................ 52
Figure 1. RJ-45 Connector and Port Pin Layout 52
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Tables
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Tables
Table 1. Safety Symbols .....................................................................................................................................................12
Table 2. System LEDs ........................................................................................................................................................20
Table 3. 10/100Base-T POE Port LEDs .............................................................................................................................21
Table 4. 10/100Base-T Non-PoE Port LEDs ......................................................................................................................22
Table 5. Uplink Combo Port LEDs ......................................................................................................................................23
Table 6. IEEE 802.3af Class vs. Power Levels ..................................................................................................................26
Table 7. Twisted Pair Cabling and Distances .....................................................................................................................37
Table 8. MDI Pin Signals (10Base-T or 100Base-TX) ........................................................................................................52
Table 9. MDI-X Pin Signals (10Base-T or 100Base-TX) ....................................................................................................53
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Tables
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Preface
This guide provides the hardware installation instructions for your
AT-FS750/24POE 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-FS750/24POE Fast Ethernet Smart 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-FS750/24POE 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
The AT-FS750/24POE Fast Ethernet Smart switch is a Layer 2 Fast
Ethernet switch designed to simplify the task of creating or expanding an
Ethernet or Fast Ethernet network.
This chapter contains the follows sections:
“Features” on page 16
“Front and Back Panels” on page 17
“Ports” on page 18
“LEDs” on page 20
“Power Supply” on page 24
“Power over Ethernet” on page 25
“Ethernet Switching Basics” on page 27
“Network Topologies” on page 30
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Chapter 1: Overview
Features
The features of the AT-FS750/24POE Fast Ethernet Smart switch include:
LEDs for unit and port status
24 Auto-Negotiating 10/100Base-T twisted pair ports with RJ-45
connectors
Two uplink combo ports (combination of one 10/100/1000Base-T
twisted pair port and one Gigabit small form-factor pluggable (SFP)
port)
Auto MDI/MDI-X on the twisted pair ports
IEEE 802.3 and IEEE 802.3u compliant
IEEE 802.3x flow control in full-duplex operation; back pressure in
half-duplex operation
IEEE 802.1p based QoS support with four priority queues per port
IEEE 802.1q based tagged up to 4K VLAN support
IEEE 802.1x port-based and MAC-based authentication with RADIUS
client
IEEE 802.1D/W spanning tree
Port mirroring support
IEEE 802.3ad link aggregation support
Dynamic Host Configuration Protocol (DHCP) client support
MAC address table capacity of up to 8K addresses with automatic
aging
Broadcast storm control
Web-based configuration using the AT-S88 management software
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Front and Back Panels
10/100Base Twisted Pair Ports
Port LEDs
Uplink Combo Ports
System LEDs
Figure 1 illustrates the front and back panels of the AT-FS750/24POE Fast
Ethernet Smart switch.
AT-FS750/24POE Fast Ethernet Smart Switch Installation Guide
SYSTEM
PWR
POE
1
3
24
5
6
10/100 POE PORTS
11 13141516171819
20
212223
24
25
AT-FS750/24POE
24 Port 10/100 Mbps WebSmart Switch
with 2 Combo Uplinks + 12 POE Ports
26
PORT ACTIVITY
LINK
100M
PD ON
1000M
ACT
10M
PD ERROR
100M
10M
1
2345678
9
10 12
7
14 16 18 20 22 24
10
12
8
10/100 PORTS
10/100/1000Base-T
CLASS 1
LASER PRODUCT
25
SFP
UPLINK PORTS
10/100/1000Base-T
26
SFP
13 15 17 19 21 23
9
11
1088
1089
Figure 1. AT-FS750/24POE Front and Back Panels
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Chapter 1: Overview
Note
Ports
The AT-FS750/24POE Fast Ethernet Smart switch features 24 twisted
pair ports and two uplink combo ports.
Twisted Pair
Ports
The twisted pair ports feature 8-pin RJ-45 connectors. (For the port
pinouts, refer to “Connectors and Port Pinouts” on page 52.)
The ports on the AT-FS750/24POE Fast Ethernet Smart switch are
10Base-T and 100Base-TX compliant and are capable of 10 megabits per
second (Mbps) and 100 Mbps speeds.
The ports are IEEE 802.3u Auto-Negotiation compliant. With AutoNegotiation, the switch automatically matches the highest possible
common speed between each switch port and each end node. For
example, if an end node is capable of only 10 Mbps, the switch sets the
port connected to the end node to 10 Mbps.
Each twisted pair port on the switch can operate in either half- or fullduplex mode. The twisted pair ports are IEEE 802.3u-compliant and AutoNegotiate 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. For further information, refer to
“Duplex Mode” on page 27.
Uplink Combo
Ports
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.
The twisted pair ports are auto-MDI. They automatically configure
themselves as either MDI or MDI-X. This feature allows you to use either
straight-through or crossover twisted pair cables to connect devices to the
ports.
Because all other twisted pair ports on the AT-FS750/24POE Fast
Ethernet Smart switch are operating at 10 Mbps and 100 Mbps speeds,
the uplink combo ports (ports 25 and 26) provide fiber optic connectivity
for the 1000 Mbps speed. Each uplink combo port consists of one 10/100/
1000Base-T twisted pair port and one SFP port. If both uplink ports are
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AT-FS750/24POE Fast Ethernet Smart Switch Installation Guide
connected, the SFP port takes precedent over the twisted pair port.
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Chapter 1: Overview
1
3
5
7
24
6
8
POE
PWR
SYSTEM
10/100 POE PORTS
LEDs
The AT-FS750/24POE Fast Ethernet Smart switch provides the LEDs
described in this section.
System LEDs The switch has two system-level LEDs, Power and PoE, as shown in
Figure 2 and described in Table 2.
LED State Description
Power Green The switch is powered up and operating normally.
PoE Green POE is available for the POE ports.
10/100Base-T
POE Port LEDs
Figure 2. System LEDs
Table 2. System LEDs
Blinking Green The switch is starting up, performing a self-test, or
dowloading software.
Off The switch is powered off.
Amber POE failed.
Ports 1 through 12 each have three LEDs as shown in Figure 3 and
described in Table 3.
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AT-FS750/24POE Fast Ethernet Smart Switch Installation Guide
2345678
9
10 12
11 13
14
1
.
Figure 3. POE Port LEDs
Table 3. 10/100Base-T POE Port LEDs
LED State Description
L/A Green A valid link has been established on the port.
10/100Base-T
Non-POE Port
LEDs
Blinking
The port is transmitting or receiving data.
Green
Off No link is established on the port.
100M Green A valid 100 Mbps link is established between
the uplink port and the end node.
Off A valid 10 Mbps link is established between
the port and the end node.
PoE Green A PoE powered device is connected and is
receiving power.
Blinking
Green
PoE is off due to a failure on the POE
powered device.
Off A PoE powered device is not connected.
Ports 13 through 24 each have two LEDs as shown in Figure 3 and
described in Table 3
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Chapter 1: Overview
13141516171819
20
212223
24
1094
171819
20
212223
24
25
26
.
Figure 4. 10/100Base-T Non-PoE Port LEDs
Table 4. 10/100Base-T Non-PoE Port LEDs
LED State Description
L/A Green A valid link has been established on the port.
Uplink Combo
Port LEDs
Blinking
The port is transmitting or receiving data.
Green
Off No link is established on the port.
100M Green A valid 100 Mbps link is established between
the uplink port and the end node.
Off A valid 10 Mbps link is established between
the port and the end node.
The LEDs for the uplink combo ports, ports 25 and 26, are shown in
Figure 5 and described in Table 5.
1095
Figure 5. Uplink Combo Port LEDs
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AT-FS750/24POE Fast Ethernet Smart Switch Installation Guide
Table 5. Uplink Combo Port LEDs
LED State Description
L/A Green A valid link has been established on the port.
Blinking
The port is transmitting or receiving data.
Green
Off No link is established on the port.
SPD Green A valid 1000 Mbps link is established
between the uplink port and the end node.
Amber A valid 100 Mbps link is established between
the uplink port and the end node.
Off A valid 10 Mbps link is established between
the uplink port and the end node.
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Chapter 1: Overview
Note
Power Supply
The 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. A power cord is supplied with the switch.
For the power requirements, refer to “Power Specifications” on
page 51.
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Power over Ethernet
Note
The twisted pair ports on the AT-FS750/24POE Fast Ethernet Smart
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, webcams, and even other Ethernet switches. A powered
device connected to a port on the switch will receive both network traffic
and power over the same twisted pair cable.
The switch automatically determines whether a device connected to a port
is a powered device or not. 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.
AT-FS750/24POE Fast Ethernet Smart Switch Installation Guide
Power Budgeting The AT-FS750/24POE Fast Ethernet Smart switch provides a maximum of
15.4 W of power per port on six of the twelve POE ports for a total power
consumption of 100 W, while at the same time furnishing standard 10/100
Mbps Ethernet functionality.
The AT-FS750/24POE smart power management functionality supports
any combination of the first twelve Ethernet ports (1-12) that supply power
for IEEE 802.3af Class 0, 1, 2, or 3 powered devices up to a maximum of
100 watts, as described in Table 6.
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 100 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 12 in that order.
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Chapter 1: Overview
Table 6. 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).
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-FS750/24POE Fast Ethernet Smart 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. So long as a PD is compliant with the standard, it
should be able to receive its power from the switch while using either a
straight or cross-over cable. The PoE feature on the AT-FS750/24POE
Fast Ethernet Smart switch should also work with most legacy PD’s as
long as the device can be powered on pins 1, 2, 3, and 6. A legacy device
is a node that was manufactured before the IEEE 802.3af standard was
completed and, consequently, may not adhere to the standard. If this is
the case, a straight (MDI) cable may be needed to insure that the DC
polarity is correct.
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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.
AT-FS750/24POE Fast Ethernet Smart Switch Installation Guide
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-FS750/24POE Fast Ethernet Smart
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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Chapter 1: Overview
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-FS750/24POE Fast Ethernet Smart
switch can operate in either half-or full-duplex mode. They are IEEE
802.3u-compliant and you can set them to Auto-Negotiation.
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 Fast 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 Auto-Negotiation or, if it lacks that feature, to half-duplex.
Store and
Forward
Back Pressure
and Flow Control
The 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 ensures that only
valid frames are transmitted out the switch ports and that damaged frames
are not propagated on your network.
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 would be when a server operating at 100 Mbps is
sending data to a workstation operating at only 10 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
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AT-FS750/24POE Fast Ethernet Smart Switch Installation Guide
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-FS750/24POE Fast Ethernet Smart switch supports both TX and
RX flow control.
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Chapter 1: Overview
1088
AT-FS750/24POE
24 Port 10/100 Mbps WebSmart Switch
with 2 Combo Uplinks + 12 POE Ports
2345678
9
10 12
11 13141516171819
20
212223
24
25
26
PD ON
PD ERROR
LINK
ACT
100M
10M
1000M
100M
PORT ACTIVITY
10M
1
1
3
5
7
9
11
13 15 17 19 21 23
24
6
8
10
12
14 16 18 20 22 24
POE
PWR
SYSTEM
10/100 POE PORTS
25
CLASS 1
LASER PRODUCT
SFP
10/100/1000Base-T
26
SFP
10/100/1000Base-T
UPLINK PORTS
10/100 PORTS
Legend
100 Mbps
1000 Mbps
10 Mbps
AT-FS750/24POE
AT-FS750/24POE
Wireless Network
Wireless Network
Wireless Network
Wireless Network
Wireless Network
Wireless Network
IP Phones
IP Phones
AT-9424T
Network Topologies
This section illustrates two network topologies that you can create with the
AT-FS750/24POE Fast Ethernet Smart switch: a power workgroup and
collapsed backbone. Both types of topologies are described below.
Power
Workgroup
Topology
301
The topology shown in Figure 6 is commonly referred to as a power
workgroup topology. Two AT-FS750/24POE Fast Ethernet Smart switches
are connected to an AT-9424T/SP Gigabit Ethernet Switch, one via an
RJ45 connection and the other using a fiber optic connection. Access
points and IP phones are connected to the switches as PoE devices. The
access points, in turn, support a wireless Ethernet network of laptop users.
Gigabit Ethernet Switch
1 3 57911 13 15 17 19 21R 23R
2468 10 12 14 16 18 20 22R 24R
301
CLASS 1
LASER PRODUCT
SFP
21 22 23 24
PORT ACTIVITY
L/A
1000 LINK / ACT
10/100 LINK / ACT
D/C
HDX /
COL
FDX
1 3 5791113 15 17 19 21R 23R
L/A
D/C
L/A
D/C
2468 10 12 14 16 18 20 22R24R
AT-9424T
TERMINAL
SFP
STATUS
L/A
PORT
21
FAULT
22
MASTER
23
24
POWER
1282
1
9
11
3
7
5
SYSTEM
PWR
POE
6
24
10
12
8
10/100 POE PORTS
301
13 15 17 19 21 23
14 16 18 20 22 24
10/100 PORTS
9
1
CLASS 1
LASER PRODUCT
25
26
10/100/1000Base-T
10/100/1000Base-T
SFP
SFP
10 12
2345678
UPLINK PORTS
11 13141516171819
212223
25
AT-FS750/24POE
24 Port 10/100 Mbps WebSmart Switch
with 2 Combo Uplinks + 12 POE Ports
PORT ACTIVITY
LINK
ACT
100M
10M
PD ON
PD ERROR
20
24
26
1000M
100M
10M
1088
301
301
Figure 6. Power Workgroup Topology
30
Page 31
AT-FS750/24POE Fast Ethernet Smart Switch Installation Guide
Legend
100 Mbps
1000 Mbps
10 Mbps
AT-9424T
AT-FS750/24POE
AT-FS750/24POE
Wireless Network
301
Collapsed Backbone
1
13 15 17 19 21 23
9
11
3
7
5
SYSTEM
PWR
POE
24
14 16 18 20 22 24
6
10
12
8
10/100 PORTS
10/100 POE PORTS
In the topology illustrated in Figure 7, an AT-9424T/SP Gigabit Ethernet
Switch forms the backbone that connects to servers and AT-FS750/
24POE Fast Ethernet Smart switches using Gigabit Ethernet uplinks. This
type of topology is often referred to as a collapsed backbone topology. The
switch functions as the focal point of the network and transfers an Ethernet
frame between the Fast Ethernet switches only when the destination end
node for the frame is on a different switch than the end node that
originated the frame. This reduces the amount of unnecessary data traffic
in each workgroup, freeing up bandwidth and improving network
performance.
Gigabit Ethernet Switch
13 15 17 19 21 23
14 16 18 20 22 24
10/100 PORTS
AT-9424T
SFP
L/A
10/100/1000Base-T
TERMINAL
STATUS
PORT
21
FAULT
22
MASTER
23
24
POWER
1282
9
11 13141516171819
1
CLASS 1
LASER PRODUCT
25
26
10/100/1000Base-T
SFP
SFP
10 12
2345678
UPLINK PORTS
1 3 57911 13 15 17 19 21R 23R
2468 10 12 14 16 18 20 22R 24R
212223
9
11 13141516171819
25
1
CLASS 1
LASER PRODUCT
25
26
10/100/1000Base-T
10/100/1000Base-T
SFP
SFP
UPLINK PORTS
AT-FS750/24POE
24 Port 10/100 Mbps WebSmart Switch
with 2 Combo Uplinks + 12 POE Ports
PORT ACTIVITY
LINK
ACT
100M
10M
PD ON
PD ERROR
20
24
26
1000M
100M
10 12
2345678
10M
1088
CLASS 1
LASER PRODUCT
SFP
21 22 23 24
PORT ACTIVITY
L/A
1000 LINK / ACT
10/100 LINK / ACT
D/C
HDX /
COL
FDX
1
SYSTEM
PWR
POE
24
1 3 5791113 15 17 19 21R 23R
L/A
D/C
L/A
D/C
2468 10 12 14 16 18 20 22R24R
9
11
3
7
5
6
10
12
8
10/100 POE PORTS
212223
25
AT-FS750/24POE
24 Port 10/100 Mbps WebSmart Switch
with 2 Combo Uplinks + 12 POE Ports
PORT ACTIVITY
LINK
ACT
100M
10M
PD ON
PD ERROR
20
24
26
1000M
100M
10M
1088
Figure 7. Collapsed Backbone - Hub Topology
31
Page 32
Chapter 1: Overview
32
Page 33
Chapter 2
Installation
This chapter contains the following sections:
“Reviewing Safety Precautions” on page 34
“Selecting a Site for the Switch” on page 36
“Cabling” on page 37
“Unpacking the Switch” on page 38
“Installing the Switch on a Desktop” on page 39
“Installing a Switch in a Rack” on page 40
“Installing an Optional SFP Transceiver” on page 43
“Cabling and Powering On the Switch” on page 45
“Starting a Management Session” on page 48
33
Page 34
Chapter 2: Installation
Note
Reviewing Safety Precautions
Please review the following safety precautions before you begin to install
the switch.
The indicates that a translation of the safety statement is
available in a PDF document titled “Translated Safety Statements”
(613-000405) on the Allied Telesis website at
www.alliedtelesis.com.
Warning: To prevent electric shock, do not remove the cover.
No user-serviceable parts inside. This unit contains hazardous
voltages and should only be opened by a trained and qualified
technician. To avoid the possibility of electric shock, disconnect
electric power to the product before connecting or disconnecting
the LAN cables.
E1
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.
Warning: Operating Temperature. This product is designed for a
maximum ambient temperature of 40° degrees C.
E2
E6
E5
E3
E7
E4
All Countries: Install product in accordance with local and
National Electrical Codes.
E8
34
Page 35
AT-FS750/24POE Fast Ethernet Smart Switch Installation Guide
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.
E25
If installed in a closed or multi-unit rack assembly, the operating
ambient temperature of the rack environment may be greater
than the room ambient temperature. Therefore, consideration
should be given to installing the equipment in an environment
compatible with the manufacturer’s maximum rated ambient
temperature (Tmra).
E35
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
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
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.
E40b
35
Page 36
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, ensure 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, ensure 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.
36
Page 37
Cabling
Note
Table 7 contains the cabling specifications for the twisted pair ports.
Table 7. Twisted Pair Cabling and Distances
Speed Type of Cable
AT-FS750/24POE Fast Ethernet Smart Switch Installation Guide
Maximum
Operating
Distance
10 Mbps Category 3 or better 100-ohm shielded or
unshielded twisted pair cable
100 Mbps Category 5 or Category 5E (Enhanced) 100-
ohm shielded or unshielded twisted pair cable
1000 Mbps Category 5 and Category 5E (Enhanced) 100-
ohm shielded or unshielded twisted pair cable
The twisted pair ports on the switch feature auto-MDI when
operating at 10, 100 or 1000 Mbps. Each port is individually
configured 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 twisted
pair port on the switch.
100 m (328 ft)
100 m (328 ft)
100 m (328 ft)
37
Page 38
Chapter 2: Installation
Note
Unpacking the Switch
To unpack the switch, perform the following procedure:
1. Remove all components from the shipping package.
2. Place the switch on a level, secure surface.
3. Ensure that the following hardware components are included in your
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.
switch package. If any item is missing or damaged, contact your Allied
Telesis sales representative for assistance.
One AT-FS750/24POE Fast Ethernet Smart switch and the following:
Two rack-mount brackets
Six rack-mount bracket screws
Four rubber feet (for desktop use)
One power cord
Documentation CD
38
Page 39
Installing the Switch on a Desktop
You can place the switch on a desktop or install them in a 19-inch rack. To
install the switch in a rack, refer to “Installing a Switch in a Rack” on
page 40.
To place 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 attach the four rubber feet to the bottom of
the switch as shown in Figure 8.
AT-FS750/24POE Fast Ethernet Smart Switch Installation Guide
2345678
1000M
100M
10M
PD ERROR
10M
ACT
PD ON
100M
LINK
PORT ACTIVITY
26
with 2 Combo Uplinks + 12 POE Ports
24 Port 10/100 Mbps WebSmart Switch
AT-FS750/24POE
25
24
212223
10 12
20
9
11 13141516171819
1
SFP
UPLINK PORTS
SFP
10/100/1000Base-T
26
10/100/1000Base-T
25
LASER PRODUCT
CLASS 1
10/100 PORTS
12
14 16 18 20 22 24
11
13 15 17 19 21 23
10/100 POE PORTS
8
10
7
9
24
6
5
3
POE
PWR
SYSTEM
1
1096
Figure 8. Attaching the Rubber Feet
3. 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.
39
Page 40
Chapter 2: Installation
3
4
1098
Installing a 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. Install a bracket on one side of the switch using a Phillips screwdriver
and three of the rack-mount screws included with the switch. Figure 9
shows how to mount the brackets on the switch.
1
3
15
1
7
1
9
2
1
4
16
1
8
20
2
1
23
25
AT-FS750/24POE
24 Port 10/100 Mbps W
wi
t
h 2 Combo
U
e
bS
plinks
m
art Switch
+ 12 POE Ports
2
2
4
26
PORT AC
L
IN
K
100M
P
D
ON
1000M
TIV
ITY
ACT
1
0M
PD
E
RRO
R
1
00M
1
0M
1097
Figure 9. Attaching the Rack-Mount Bracket
3. Repeat step 2 to attach the remaining bracket to the other side of the
switch.
4. Mount the switch on a 19-inch rack, as shown in Figure 10.
15
1
7
1
9
2
1
23
25
AT-FS750/24POE
24 Port 10/100 M
wi
t
h
2 Com
bps
bo
16
1
8
2
0
2
2
2
4
26
W
U
e
b
p
Smart Sw
link
s +
12 POE
i
tc
h
Ports
PORT A
C
TIVITY
L
IN
K
ACT
100M
1
0M
P
D
O
N
P
1000M
D
ER
R
O
R
1
00
M
1
0M
Figure 10. Mounting the Switch on the Rack
40
Page 41
AT-FS750/24POE Fast Ethernet Smart Switch Installation Guide
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
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.
E1
E2
E3
E4
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.
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.
Warning: Mounting of the equipment in the rack should be such
that a hazardous condition is not created due to uneven
mechanical loading.
E21
E25
E6
E5
E7
41
Page 42
Chapter 2: Installation
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.
E36
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
42
Page 43
Installing an Optional SFP Transceiver
Note
Note
Warning
The AT-FS750/24POE Fast Ethernet Smart switch has two SFP uplink
ports.
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 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-FS750/24POE Fast Ethernet Smart Switch Installation Guide
An SFP transceiver can be damaged by static electricity. Be sure to
observe all standard electrostatic discharge (ESD) precautions,
such as wearing an antistatic wrist strap, to avoid damaging the
transceiver.
2. Remove the dust plug from the SFP slot, as shown in Figure 11.
CLASS
LASE
1
R P
R
OD
U
C
10/100/1000Base-T
T
25
SFP
10/100/1000Base-T
26
SFP
UPLINK PO
R
TS
1099
Figure 11. Removing the Dust Plug from the SFP Slot
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.
43
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Chapter 2: Installation
Note
Note
1100
4. Slide the SFP transceiver into an SFP slot on the switch, as shown in
Figure 12.
CLAS
L
S 1
ASER PRO
10/100/1000Base-T
DUCT
25
SFP
10/100/1000Base-T
26
SFP
UPLINK PO
R
TS
Figure 12. Inserting the SFP
5. Repeat steps 2 through 4 if you are installing another SFP transceiver.
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
optical bores. 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, consult the documentation
that was shipped with the SFP.
44
Page 45
Cabling and Powering On the Switch
AT-FS750/24POE Fast Ethernet Smart Switch Installation Guide
Connecting the
Twisted Pair
Cables
To connect the twisted cables to the RJ-45 ports on the AT-FS750/24POE
Fast Ethernet Smart switch, perform the following procedure:
1. Plug the twisted pair data cables to the RJ-45 ports on the switch, as
shown in Figure 13.
1
3
5
SYSTEM
PW
R
P
O
E
24
7
6
10/
1
00
8
P
OE PO
R
T
S
1101
Figure 13. Connecting the Twisted Pair Data Cables
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.
Connecting the
Fiber Optic
Cables
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
2. Connect the other end of the twisted pair cable to a port in the end
node.
To connect a fiber optic cable to an SFP installed in the AT-FS750/24POE
Fast Ethernet Smart switch, perform the following procedure:
45
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Chapter 2: Installation
1. Remove the dust plug from the SFP, as shown in Figure 14.
CLASS 1
LASER
PR
OD
10/100/1000Base-T
UCT
25
SFP
10/100/1000Base-T
26
SFP
UPLINK PORTS
1102
Figure 14. Removing the Dust Plug from the SFP
2. Connect the fiber optic cable to the SFP port, as shown in Figure 15.
Powering On the
Switch
CLASS 1
10/100/1000Base-T
LASER PRODUCT
25
SFP
10/100/1000Base-T
UPLINK PORTS
26
SFP
1103
Figure 15. Connecting the Fiber Optic Cable
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 16.
46
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AT-FS750/24POE Fast Ethernet Smart Switch Installation Guide
1104
Figure 16. Plugging in 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 POWER LED is green. If the LED is OFF, refer to
Chapter 3, “Troubleshooting” on page 49.
The switch is now powered on and ready for network operations. To
start a management session on the switch, refer to “Starting a
Management Session” on page 48. session, refer to the AT-S88
Management Software User’s Guide.
47
Page 48
Chapter 2: Installation
Starting a Management Session
To start a management session on an AT-FS750/24POE Fast Ethernet
Smart switch, perform the following procedure:
1. In a web browser address box, enter the following IP address:
192.168.1.1
The main page for the AT-S88 management software is shown in
Figure 17.
Figure 17. AT-S88 Management Software Main Page
Because the switch initially has no login or password protection, follow
the instructions in the AT-S88 Management Software User’s Guide to
change the IP address and add administrative users.
48
Page 49
Chapter 3
Note
Note
Troubleshooting
This chapter contains information on how to troubleshoot the switch in the
event that a problem occurs.
If you need further assistance, please contact Allied Telesis
Technical Support. Refer to “Contacting Allied Telesis” on page 14.
Check the POWER LED on the front of the switch. 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.
Verify that the LINK/ACT LED for each port is ON. If a LINK/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).
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 five to ten seconds to establish
a link.
49
Page 50
Chapter 3: Troubleshooting
50
Page 51
Appendix A
Technical Specifications
Physical Specifications
Dimensions: 444 mm x 322 mm x 43.5 mm
(17.48 in x 12.67 in x 1.71 in)
Weight: 4.133 kg (9.11 lbs)
Environmental Specifications
Operating Temperature: -0° C to 40° C (14° F to 122° F)
Storage Temperature: -25° C to 70° C (-40° F to 158° F)
Operating Humidity: 5% to 90% non-condensing
Storage Humidity: 5% to 95% non-condensing
Operating Altitude Range: Up to 3,000 m (9,843 ft)
Power Specifications
AC Voltage/Frequency Requirements: 100 - 240 VAC, 50/60 Hz
AC Input Power Consumption: 150 W Maximum
Available Power over Ethernet: 100 W @ 48 VDC
IEEE 802.3af Class 3 (15.4 W): Max 6 ports
IEEE 802.3af Class 2 (7.3 W): Max 12 ports
IEEE 802.3af Mode: Alternative A (MDI)
51
Page 52
Appendix A: Technical Specifications
8
8
1
1
Safety and Electromagnetic Emissions Certifications
EMI/RFI: FCC Class A, EN55022 Class A,
CISPR Class A, C-TICK, CE
Immunity: EN55024
Electrical Safety: EN60950-1 (TUV), UL60950-1 (
Connectors and Port Pinouts
This section lists the connectors and connector pinouts for the
AT-FS750/24POE Fast Ethernet Smart Switch and its components.
Figure 18 illustrates the pin layout for an RJ-45 connector and port.
Figure 18. RJ-45 Connector and Port Pin Layout
Table 8 lists the RJ-45 pin signals when a twisted pair port is operating in
the MDI configuration.
Table 8. MDI Pin Signals (10Base-T or 100Base-TX)
cULus)
52
Pin Signal
1TX+
2TX-
3RX+
6RX-
Page 53
AT-FS750/24POE Fast Ethernet Smart Switch Installation Guide
Table 9 lists the RJ-45 port pin signals when a twisted pair port is
operating in the MDI-X configuration.
Table 9. MDI-X Pin Signals (10Base-T or 100Base-TX)
Pin Signal
1RX+
2RX-
3TX+
6TX-
53
Page 54
Appendix A: Technical Specifications
54
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