Page 1
Fast Ethernet
Smart Switch
AT-FS750/48
Installation Guide
613-000537 Rev. B
Page 2
Copyright © 2007 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
3
Page 4
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.
4
Page 5
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
Warranty........................................................................................................................................................................14
Returning Products........................................................................................................................................................14
Sales or Corporate Information .....................................................................................................................................14
Management Software Updates ....................................................................................................................................14
Overview .............................................................................................................................................................................15
Features ...............................................................................................................................................................................16
Front and Back Panels .........................................................................................................................................................17
Ports .....................................................................................................................................................................................18
Twisted Pair Ports .........................................................................................................................................................18
SFP Ports ......................................................................................................................................................................18
LEDs.....................................................................................................................................................................................19
Power LED ....................................................................................................................................................................19
10/100Base-T Port LEDs ..............................................................................................................................................19
10/100/1000Base-T Port LEDs .....................................................................................................................................20
SFP LEDs......................................................................................................................................................................21
Power Supply .......................................................................................................................................................................22
Ethernet Switching Basics ....................................................................................................................................................23
MAC Address Table ......................................................................................................................................................23
Duplex Mode .................................................................................................................................................................23
Store and Forward.........................................................................................................................................................24
Back Pressure and Flow Control...................................................................................................................................24
Network Topologies..............................................................................................................................................................26
Power Workgroup Topology .......................................................................................................
Collapsed Backbone .....................................................................................................................................................27
...................................26
Installation ..........................................................................................................................................................................29
Reviewing Safety Precautions..............................................................................................................................................30
Selecting a Site for the Switch..............................................................................................................................................32
Cabling .................................................................................................................................................................................33
Unpacking the Switch ...........................................................................................................................................................34
Installing the Switch on a Desktop ........................................................................................................................................35
Installing the Switch in a Rack ..............................................................................................................................................36
Installing an Optional SFP Transceiver ................................................................................................................................39
Cabling and Powering On the Switch ...................................................................................................................................41
Connecting the Twisted Pair Cables .............................................................................................................................41
Connecting the Fiber Optic Cables ...............................................................................................................................42
Powering On the Switch ................................................................................................................................................42
Starting a Management Session ..........................................................................................................................................44
Troubleshooting ................................................................................................................................................................45
Appendix A: Technical Specifications .............................................................................................................................47
Physical Specifications .........................................................................................................................................................47
Environmental Specifications................................................................................................................................................47
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Contents
Power Specifications.............................................................................................................................................................47
Safety and Electromagnetic Emissions Certifications...........................................................................................................47
Connectors and Port Pinouts ................................................................................................................................................48
6
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Figures
Figure 1. AT-FS750/48 Front and Back Panels...................................................................................................................17
Figure 2. Power LED ...........................................................................................................................................................19
Figure 3. 10/100Base-T Port LEDs......................................................................................................................................20
Figure 4. 10/100/1000Base-T Port LEDs.............................................................................................................................20
Figure 5. SFP LED ..............................................................................................................................................................21
Figure 6. Power Workgroup Topology.................................................................................................................................26
Figure 7. Collapsed Backbone - Hub Topology...................................................................................................................27
Figure 8. Attaching the Rubber Feet ...................................................................................................................................35
Figure 9. Attaching the Rack-Mount Bracket .......................................................................................................................36
Figure 10. Mounting the Switch on the Rack.......................................................................................................................36
Figure 11. Removing the Dust Plug from the SFP Slot .......................................................................................................39
Figure 12. Inserting the SFP................................................................................................................................................40
Figure 13. Connecting the Twisted Pair Data Cables..........................................................................................................41
Figure 14. Removing the Dust Plug from the SFP...............................................................................................................42
Figure 15. Connecting the Fiber Optic Cable ......................................................................................................................42
Figure 16. Plugging in the AC Power Cord..........................................................................................................................43
Figure 17. AT-S86 Management Software Main Page........................................................................................................44
Figure 18. RJ-45 Connector and Port Pin Layout................................................................................................................48
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Figures
8
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Tables
Table 1. Safety Symbols .....................................................................................................................................................12
Table 2. Power LED ...........................................................................................................................................................19
Table 3. 10/100Base-T Port LEDs ......................................................................................................................................20
Table 4. 10/100/1000Base-T Port LEDs .............................................................................................................................21
Table 5. SFP LED ...............................................................................................................................................................21
Table 6. Twisted Pair Cabling and Distances .....................................................................................................................33
Table 7. MDI Pin Signals (10Base-T or 100Base-TX) ........................................................................................................48
Table 8. MDI-X Pin Signals (10Base-T or 100Base-TX) ....................................................................................................48
Table 9. RJ-45 1000Base-T Connector Pinouts .................................................................................................................49
9
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Tables
10
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Preface
This guide contains instructions on how to install the AT-FS750/48 Fast
Ethernet Smart 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
11
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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.
12
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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-FS750/48 Fast Ethernet Smart Switch Installation Guide
13
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Preface
Contacting Allied Telesis
This section provides Allied Telesis contact information for technical
support as well as sales and corporate information.
Online Support You can request technical support online by accessing the Allied Telesis
Knowledge Base: www.alliedtelesis.com/support/kb.aspx. 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
For Technical Support via email or telephone, refer to the Support &
Services section of the Allied Telesis web site: www.alliedtelesis.com.
Select your country from the list displayed on the website. then select the
appropriate menu tab.
Warranty For hardware warranty information, refer to the Allied Telesis web site:
www.alliedtelesis.com/support/warranty.
Returning
Products
Sales or
Corporate
Products for return or repair must first be assigned a return materials
authorization (RMA) number. A product sent to Allied Telesis without an
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 through
our web site: www.alliedtelesis.com. To find the contact information for
your country, select Contact Us -> Worldwide Contacts.
Information
Management
Software Updates
14
New releases of management software for our managed products are
available from either of the following Internet sites:
r Allied Telesis web site: www.alliedtelesis.com
r Allied Telesis FTP server: ftp://ftp.alliedtelesis.com
If you prefer to download new software from the Allied Telesis FTP server
from your workstation’s command prompt, you will need FTP client
software and you must log in to the server. Enter “anonymous” for the user
name and your email address for the password.
Page 15
Chapter 1
Overview
The AT-FS750/48 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 19
“Power Supply” on page 22
“Ethernet Switching Basics” on page 23
“Network Topologies” on page 26
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Chapter 1: Overview
Features
The features of the AT-FS750/48 Fast Ethernet Smart switch include:
LEDs for unit and port status
48 10/100Base-T twisted pair ports with RJ-45 connectors
Two 10/100/1000Base-T twisted pair ports
Two Gigabit Ethernet small form-factor pluggable (SFP) ports
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-S86 management software
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Front and Back Panels
Figure 1 illustrates the front and back panels of the AT-FS750/48 Fast
Ethernet Smart switch.
AT-FS750/48 Fast Ethernet Smart Switch Installation Guide
PORT ACTIVITY
10M
100M
LINK
ACT
10M100M
1000M
1025
Power Connector
10/100Base-T Twisted Pair Ports
10/100/1000Base-T Twisted Pair Ports
Figure 1. AT-FS750/48 Front and Back Panels
SFP Ports
1025
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Chapter 1: Overview
Ports
The AT-FS750/48 Fast Ethernet Smart switch features 48 10/100/Base-T
twisted pair ports, two 10/100/1000Base-T twisted pair ports, and two
Gigabit small form-factor pluggable (SFP) 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 48.)
Ports 1 through 48 are 10Base-T and 100Base-TX compliant. Ports 49
and 50 are 10Base-T, 100Base-TX, and 1000Base-TX compliant.
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 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 fullduplex mode. The twisted pair ports are IEEE 802.3u-compliant and AutoNegotiate the duplex mode setting.
Note
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 23.
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.
SFP Ports The SFP ports, ports 51 and 52, require a 1000SX or 1000LX transceiver.
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LEDs
1357
2468
POWER
AT-FS750/48 Fast Ethernet Smart Switch Installation Guide
The AT-FS750/48 Fast Ethernet Smart switch provides the LEDs
described in this section.
Power LED The AT-FS750/48 Fast Ethernet Smart switch has a Power LED, as shown
in Figure 2 and described in Table 2.
1028
10/100Base-T
Port LEDs
Power LED
Figure 2. Power LED
Table 2. Power LED
State Description
Green The switch is powered up and operating normally.
Blinking Green The switch is starting up, performing a self-test, or
downloading software.
Amber The power on self-test failed.
Off The switch is powered off.
Ports 1 through 48 each have two LEDs as shown in Figure 3 and
described in Figure 3 on page 20.
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Chapter 1: Overview
1357
2468
POWER
LINK
1000M
ACT
10M100M
PORT ACTIVITY
100M
10M
.
1028
Figure 3. 10/100Base-T Port LEDs
Table 3. 10/100Base-T Port LEDs
LED State Description
10/100/1000Base-
T Port LEDs
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.
100M Green A valid 100 Mbps link is established between
the port and the end node.
Off A valid 10 Mbps link is established between
the port and the end node.
The LEDs for the 10/100/1000Base-T ports, ports 49 and 50, are shown in
Figure 4 and described in Table 4.
1029
Figure 4. 10/100/1000Base-T Port LEDs
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AT-FS750/48 Fast Ethernet Smart Switch Installation Guide
LINK
1000M
ACT
10M100M
PORT ACTIVITY
100M
10M
Table 4. 10/100/1000Base-T 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.
SFP LEDs Each SFP port, ports 51 and 52, has one LED as shown in Figure 5 and
described in Table 5 on page 21.
1030
Figure 5. SFP LED
Table 5. SFP LED
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.
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Chapter 1: Overview
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.
Note
For the power requirements, refer to “Power Specifications” on
page 47.
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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-FS750/48 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-FS750/48 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-FS750/48 Fast Ethernet Smart switch
can operate in either half-or full-duplex mode. They are IEEE 802.3ucompliant 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-FS750/48 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-FS750/48 Fast Ethernet Smart switch supports both TX and RX
flow control.
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Chapter 1: Overview
Network Topologies
This section illustrates two network topologies that you can create with the
AT-FS750/48 Fast Ethernet Smart switch: a power workgroup and
collapsed backbone. Both types of topologies are described below.
Power
Workgroup
Topology
The topology shown in Figure 6 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 or 100 Mbps.
PORT ACTIVITY
10M
100M
LINK
ACT
10M100M
1000M
1025
Legend
10 Mbps
100 Mbps
1000 Mbps
Figure 6. Power Workgroup Topology
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AT-FS750/48 Fast Ethernet Smart Switch Installation Guide
Collapsed Backbone
AT-FS716L
In the topology illustrated in Figure 7, an AT-FS750/48 Fast Ethernet
Smart switch connects switches that have Fast 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.
PORT ACTIVITY
10M
100M
ACT
LINK
10M100M
1000M
1025
AT-GS950/16
AT-GS950/16 16-Port 10/100/1000Mbps + 2 SFP Combo WebSmart Switch
13579111315
SPEED
LINK/ACT
SPEED
LINK/ACT
LINK/ACT
POWER
2 4 6 8 10 12 14 16
15 16
731
Legend
10 Mbps
100 Mbps
1000 Mbps
Figure 7. Collapsed Backbone - Hub Topology
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Chapter 1: Overview
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Chapter 2
Installation
This chapter contains the following sections:
“Reviewing Safety Precautions” on page 30
“Selecting a Site for the Switch” on page 32
“Cabling” on page 33
“Unpacking the Switch” on page 34
“Installing the Switch on a Desktop” on page 35
“Installing the Switch in a Rack” on page 36
“Installing an Optional SFP Transceiver” on page 39
“Cabling and Powering On the Switch” on page 41
“Starting a Management Session” on page 44
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Chapter 2: Installation
Reviewing Safety Precautions
Please review the following safety precautions before you begin to install
the chassis or any of its components.
Note
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.
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
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AT-FS750/48 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
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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.
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Cabling
Table 6 contains the cabling specifications for the twisted pair ports.
Table 6. Twisted Pair Cabling and Distances
Speed Type of Cable
AT-FS750/48 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
Note
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)
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Chapter 2: Installation
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
Note
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-FS750/48 Fast Ethernet Smart switch and the following:
Two rack-mount brackets
Six #6-32 rack-mount bracket screws
Four rubber feet (for desktop use)
One power cord
Documentation CD
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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 the Switch in a Rack” on
page 36.
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.
1000M
10M100M
ACT
LINK
100M
10M
PORT ACTIVITY
AT-FS750/48 Fast Ethernet Smart Switch Installation Guide
1005
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.
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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. 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.
1006
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.
1007
Figure 10. Mounting the Switch on the Rack
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AT-FS750/48 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
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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
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Installing an Optional SFP Transceiver
The AT-FS750/48 Fast Ethernet Smart switch has two SFP uplink ports.
To install an SFP transceiver, perform the following procedure:
Note
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.
Note
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-FS750/48 Fast Ethernet Smart Switch Installation Guide
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, as shown in Figure 11.
1008
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.
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Chapter 2: Installation
4. Slide the SFP transceiver into an SFP slot on the switch, as shown in
Figure 12.
Figure 12. Inserting the SFP
5. Repeat steps 2 through 4 if you are installing another SFP transceiver.
Note
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.
Note
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.
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Cabling and Powering On the Switch
AT-FS750/48 Fast Ethernet Smart Switch Installation Guide
Connecting the
Twisted Pair
Cables
To connect the twisted cables to the RJ-45 ports on the AT-FS750/48 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.
1010
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.
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.
2. Connect the other end of the twisted pair cable to a port in the end
node.
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Chapter 2: Installation
Connecting the
Fiber Optic
Cables
To connect a fiber optic cable to an SFP installed in the AT-FS750/48 Fast
Ethernet Smart switch, perform the following procedure:
1. Remove the dust plug from the SFP, as shown in Figure 14.
1013
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
1011
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.
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AT-FS750/48 Fast Ethernet Smart Switch Installation Guide
1012
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.
8
Pluggable Equipment. The socket outlet shall be installed near
the equipment and shall be easily accessible.
10
3. Verify that the POWER LED is green. If the LED is off, refer to Chapter
3, “Troubleshooting” on page 45.
The switch is now powered on and ready for network operations. To
start a local management session on the switch, refer to “Starting a
Management Session” on page 44.
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Chapter 2: Installation
Starting a Management Session
To start a local management session on an AT-FS750/48 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-S86 management software is shown in
Figure 17.
Figure 17. AT-S86 Management Software Main Page
Because the switch initially has no login or password protection, follow
the instructions in the AT-S86 Management Software User’s Guide to
change the IP address and add administrative users.
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Chapter 3
Troubleshooting
This chapter contains information on how to troubleshoot the switch in the
event that a problem occurs.
Note
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.
Note
A 1000Base connection may require five to ten seconds to establish
a link.
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Chapter 3: Troubleshooting
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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: 3.79 kg (8.35 lbs)
Environmental Specifications
Operating Temperature: 0° C to 40° C (32° F to 104° F)
Storage Temperature: -25° C to 70° C (-13° F to 158° F)
Operating Humidity: 15% to 90% non-condensing
Storage Humidity: 0% to 95% non-condensing
Operating Altitude Range: Up to 3,000 m (9,843 ft)
Power Specifications
Input Supply Voltage: 100 - 240 VAC, 50/60Hz
Power Consumption: <50 Watts
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 (
cULus)
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Appendix A: Technical Specifications
Connectors and Port Pinouts
This section lists the connectors and connector pinouts for the
AT-FS750/48 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 7 lists the RJ-45 pin signals when a twisted pair port is operating in
the MDI configuration.
Table 7. MDI Pin Signals (10Base-T or 100Base-TX)
8
1
8
1
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-
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AT-FS750/48 Fast Ethernet Smart Switch Installation Guide
Table 9 lists the RJ-45 connector pins and their signals when a
1000Base-T port is operating at 1000 Mbps.
Table 9. RJ-45 1000Base-T Connector Pinouts
Pin Pair Signal
1 1 TX and RX+
2 1 TX and RX-
3 2 TX and RX+
4 3 TX and RX+
5 3 TX and RX-
6 2 TX and RX-
7 4 TX and RX+
8 4 TX and RX-
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Appendix A: Technical Specifications
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