613-000556 Rev. D
Fast Ethernet
Smart Switch
AT-FS750/24POE
Installation Guide
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.
3
Electrical Safety and Emissions Standards
This product meets the following standards.
RFI Emissions FCC Class A, EN55022 Class A, CISPR Class A, C-TICK, CE
Immunity EN55024
Electrical Safety EN60950-1 (TUV), UL 60950-1 (
C
UL
US
)
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.
Warning: In a domestic environment this product may cause radio interference in
which case the user may be required to take adequate measures.
Laser Safety EN60825
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.
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
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
Contents
6
Physical Specifications .........................................................................................................................................................51
Environmental Specifications................................................................................................................................................51
Power Specifications.............................................................................................................................................................51
Safety and Electromagnetic Emissions Certifications...........................................................................................................52
Connectors and Port Pinouts ................................................................................................................................................52
7
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
Figures
Tables
8
9
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
Tables
10
Preface
12
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.
AT-FS750/24POE Fast Ethernet Smart Switch Installation Guide
13
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.
Preface
14
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
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.
Returning
Products
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.
For Sales or
Corporate
Information
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.
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.
15
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
Chapter 1: Overview
16
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
AT-FS750/24POE Fast Ethernet Smart Switch Installation Guide
17
Front and Back Panels
Figure 1 illustrates the front and back panels of the AT-FS750/24POE Fast
Ethernet Smart switch.
Figure 1. AT-FS750/24POE Front and Back Panels
1088
AT-FS750/24POE
24 Port 10/100 Mbps WebSmart Switch
with 2 Combo Uplinks + 12 POE Ports
2
3
4
5
6
7
8
9
10 12
11 13
14
15
16
17
18
19
20
21
22
23
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
10/100Base Twisted Pair Ports
Port LEDs
Uplink Combo Ports
System LEDs
1089
Chapter 1: Overview
18
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 Auto-
Negotiation, the switch automatically matches the highest possible
common speed between each switch port and each end node. For
example, if an end node is capable of only 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 full-
duplex mode. The twisted pair ports are IEEE 802.3u-compliant and Auto-
Negotiate 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 27.
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.
Uplink Combo
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
AT-FS750/24POE Fast Ethernet Smart Switch Installation Guide
19
connected, the SFP port takes precedent over the twisted pair port.
Chapter 1: Overview
20
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.
Figure 2. System LEDs
10/100Base-T
POE Port LEDs
Ports 1 through 12 each have three LEDs as shown in Figure 3 and
described in Table 3.
1
3
5
7
24
6
8
POE
PWR
SYSTEM
10/100 POE PORTS
Table 2. System LEDs
LED State Description
Power Green The switch is powered up and operating normally.
Blinking Green The switch is starting up, performing a self-test, or
dowloading software.
Off The switch is powered off.
PoE Green POE is available for the POE ports.
Amber POE failed.
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