Allied Telesis CentreCOM AT-3726XL User manual

Switches
AT-3726XL
AT-3716XL
AT-3714FXL
!
Installation
Guide
®
PN 613-10766-00 Rev B

Copyright 1998-1999 AlliedTelesyn International, Corp.
960 Srewart Drive Suite B, Sunnyvale CA 94086 USA
All rights reserved. No part of this publication may be reproduced without prior written permission from Allied Telesyn International,
Corp.
CentreCom is a registered trademark of AlliedTelesyn International, Corp.
All other product names, company names, logos or other designations mentioned herein are trademarks or registered trademarks of
their respective owners.
AlliedTelesyn International, Corp. 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
Telesyn International, Corp. 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 Telesyn International,
Corp. has been advised of, known, or should have known, the possibility of such damages.

iii
Electrical Safety and Installation
Requirements
For AT-3726XL and AT-3716XL
Standards: This product meets the following standards
RFI Emission EN55022 Class A "1a
Immunity EN50082-1 "2
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 the
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 t o
correct the interference at his own expense.
Note: Modifications or changes not expressly approved by the manufacturer or the FCC can void your right to operate this
equipment.
Canadian Department of Communications
This Class A digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations.
Cet appareil numérique de la classe A respecte toutes les exigences du Règlement sur le matériel brouilleur du Canada.

Electrical Safety and Installation Requirements
iv
For AT-3714FXL
Standards: This product meets the following standards.
RFI Emission EN55022 Class B "1b
Immunity EN50082-1 "2
Declaration Of Conformity
Manufacturers Name: Allied Teleysn International, Corp.
Manufacturers Address: 960 Stewart Drive, Suite B
Sunnyvale, CA 94086 USA
Manufacturers Telephone: [phone]
Declares that the product: Fiber Ethernet Switch
Model Number: AT-3714FXL
This product complies with FCC Part 15B, Class B Limits:
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device must
not cause harmful interference, and (2) this device must accept any interference received, including interference that may
cause undesired operation.
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC
rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This
equipment, generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with
instructions, may cause harmful interference to radio or television reception, which can be determined by turning the
equipment off and on, the user is encourage to try to correct the interference by one or more of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and the receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.
Changes and modifications not expressly approved by the manufacturer or registrant of this equipment can void your
authority to operate this equipment under Federal Communications Commission rules.
Canadian Department of Communications
This Class B digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations.
Cet appareil numérique de la classe B respecte toutes les exigences du Règlement sur le matériel brouilleur du Canada.

v
Safety Warnings
WARNING: In a domestic environment this product may cause radio interference in which case the user may be required to take
adequate measures. "3
IMPORTANT: Appendix A contains translated safety statements for installing this equipment. When you see the ", go to
Appendix A for the translated safety statement in your language.
WICHTIG: Anhang A enthält übersetzte Sicherheitshinweise für die Installation dieses Geräts. Wenn Sie "sehen, schlagen Sie in
Anhang A den übersetzten Sicherheitshinweis in Ihrer Sprache nach.
VIGTIGT: Tillæg A indeholder oversatte sikkerhedsadvarsler, der vedrører installation af dette udstyr. Når De ser symbolet", skal
De slå op i tillæg A og finde de oversatte sikkerhedsadvarsler i Deres eget sprog.
BELANGRIJK: Appendix A bevat vertaalde veiligheidsopmerkingen voor het installeren van deze apparatuur. Wanneer u de "
ziet, raadpleeg Appendix A voor vertaalde veiligheidsinstructies in uw taal.
IMPORTANT : L'annexe A contient les instructions de sécurité relatives à l'installation de cet équipement. Lorsque vous voyez le
symbole ", reportez-vous à l'annexe A pour consulter la traduction de ces instructions dans votre langue.
TÄRKEÄÄ: Liite A sisältää tämän laitteen asentamiseen liittyvät käännetyt turvaohjeet. Kun näet "-symbolin, katso käännettyä
turvaohjetta liitteestä A.
IMPORTANTE: l’Appendice A contiene avvisi di sicurezza tradotti per l’installazione di questa apparecchiatura. Il simbolo",
indica di consultare l’Appendice A per l’avviso di sicurezza nella propria lingua.
VIKTIG: Tillegg A inneholder oversatt sikkerhetsinformasjon for installering av dette utstyret. Når du ser ", åpner du til Tillegg A
for å finne den oversatte sikkerhetsinformasjonen på ønsket språk.
IMPORTANTE: O Anexo A contém advertências de segurança traduzidas para instalar este equipamento. Quando vir o símbolo
", leia a advertência de segurança traduzida no seu idioma no Anexo A.
IMPORTANTE: El Apéndice A contiene mensajes de seguridad traducidos para la instalación de este equipo. Cuando vea el
símbolo ", vaya al Apéndice A para ver el mensaje de seguridad traducido a su idioma.
OBS! Bilaga A innehåller översatta säkerhetsmeddelanden avseende installationen av denna utrustning. När du ser", skall du gå
till Bilaga A för att läsa det översatta säkerhetsmeddelandet på ditt språk.

vii
Table of Contents
Electrical Safety and Installation Requirements .......................................................................................................................iii
For AT-3726XL and AT-3716XL ........................................................................................................................................................................iii
For AT-3714FXL ......................................................................................................................................................................................................iv
Safety Warnings ......................................................................................................................................................................................................v
Preface
Purpose of This Guide ............................................................................................................................................................................Preface-i
How This Guide is Organized ..............................................................................................................................................................Preface-i
Document Conventions ......................................................................................................................................................................Preface-ii
Related Guides ........................................................................................................................................................................................Preface-ii
Chapter 1
Product Description ...................................................................................................................................................................................1-1
Physical Description ..........................................................................................................................................................................................1-3
Hardware Features ............................................................................................................................................................................................1-4
Network Management Features ...................................................................................................................................................................1-5
MAC Addressing .........................................................................................................................................................................................1-5
Store-and- Forward Mode.......................................................................................................................................................................1-5
Transmit Pacing ..........................................................................................................................................................................................1-5
Mirror Port.....................................................................................................................................................................................................1-6
Media Dependent Adapters (MDAs) ...................................................................................................................................................1-6
RS232 Connector ................................................................................................................................................................................................1-8
Reset Button .........................................................................................................................................................................................................1-8
AC Power Connector .........................................................................................................................................................................................1-8
Chapter 2
Installing the Switch ..................................................................................................................................................................................2-1
Verifying Switch Package Contents .............................................................................................................................................................2-1
Safety Information .............................................................................................................................................................................................2-2
Preparing the Site ..............................................................................................................................................................................................2-3
Installing the Switch on the Desktop ..........................................................................................................................................................2-4
Rack Mounting the Unit ...................................................................................................................................................................................2-5
Setting Up Terminal for Local Management Using Omega ...............................................................................................................2-7
Switch Default Settings ....................................................................................................................................................................................2-8
Media Dependent Adapters ...........................................................................................................................................................................2-9
Verifying Package Contents....................................................................................................................................................................2-9
Media Dependent Adapter Features.................................................................................................................................................2-10
Installing a Media Dependent Adapter............................................................................................................................................2-11
Media Dependant Adapter LEDs ........................................................................................................................................................2-12

Table of Contents
viii
Chapter 3
Troubleshooting ...........................................................................................................................................................................................3-1
At the First Sign of a Problem ........................................................................................................................................................................3-1
Network Cabling Problems .............................................................................................................................................................................3-2
Contacting Technical Support .......................................................................................................................................................................3-3
How the Switch Reports Problems ...............................................................................................................................................................3-4
Common Problems ............................................................................................................................................................................................3-5
Port Activity LED ON any Port is OFF...................................................................................................................................................3-5
Power LED is OFF ........................................................................................................................................................................................3-6
Fault LED is ON ............................................................................................................................................................................................3-7
Chapter 4
Switch Configurations ..............................................................................................................................................................................4-1
Standalone Switch Configuration ................................................................................................................................................................4-1
Workgroup Switch Configuration ................................................................................................................................................................4-3
Appendix A
Translated Safety Information ...........................................................................................................................................................A-1
Appendix B
Technical Specifications ..........................................................................................................................................................................B-1
Media Dependent Adapter Cabling Distances ........................................................................................................................................B-2
Index ............................................................................................................................................................................................................Index-1

Preface-i
Preface
Purpose of This Guide
This guide is written for installers and network administrators who
are responsible for installing and maintaining the switch.
How This Guide is Organized
This guide consists of the following sections:
Chapter 1, Product Description, describes the features and
functions of the switch.
Chapter 2, Installing the Switch, describes the procedures for
installing the switch.
Chapter 3, Troubleshooting, describes how to troubleshoot the
switch.
Chapter 4, Switch Configurations, presents topological illustrations
for the switch.
Appendix A, Translated Safety Information, contains all of the
translated safety warnings documented throughout this guide.
Appendix B, Technical Specifications, presents in tabular form the
switch specifications.
An Index at the end of this guide lists entries according to subject
matter.

Preface
Preface-ii
Document Conventions
The conventions used in this guide are as follows:
Note
A note provides additional information.
Warning
A warning indicates that performing or omitting a specific action
may result in bodily injury.
Caution
A caution indicates that performing or omitting a specific action
may result in equipment damage or loss of data.
When you see the ", go to Appendix A for the translated safety
statement in your language.
Related Guides
Allied Telesyn wants our customers to be well informed by providing
the most up-to-date and most easily accessible way to find our
guides and other technical information.
Visit our website at: www.alliedtelesyn.com and download the
following guide:
AT-3726XL, AT-3716XL, and AT-3714FXL Installation
Guide, 613-10766-00
AT-S20 User’s Guide, 613-10716-00
The following guides are shipped with their respective products:
AT-3726XL and AT-3716XL Quick Install Guide,
613-10769-00
AT-3726XL and AT-3716XL Translated Safety Information
Booklet, 613-10768-00
AT-3714FXL Quick Install Guide, 613-10767-00
AT-3714FXL Translated Safety Information Booklet,
613-10770-00
AT-A10, AT-A11, AT-A20 and AT-A21 Quick Install Guide,
613-10742-00

1-1
Chapter 1
Product Description
The AT-3726XL and AT-3716XL are standalone, managed Ethernet
switches that provides 24 or 14 10Base-T ports and one built-in
10/100Base-TX port. All ports capable of full- or half-duplex with
auto-negotiation or manual configuration on all ports.
The AT-3714FXL provides 12 10Base-FL ports with one built-in
100Base-FX (SC). All ports manually configurable for half- or full-
duplex.
All switches include a 100Base slot that can be configured with an
optional Media Dependent Adapter (MDA) for 10/100Base-TX,
100Base-FX (SC), 100Base-FX (MT-RJ) or 100Base-FX (VF-45). Figure
1-1 shows the switches with the optional AT-A10, AT-A11, AT-A20
and AT-A21 MDAs.
The switches are intended for connections to the desktop as well as
workgroup applications and implement direct high-speed server
and backbone connections. Full-duplex capability on all ports
eliminates collisions and provides up to 20 Mbps on the 10Base ports
and up to 200 Mbps of bandwidth on the 100Base ports to servers,
routers, and other switches. With built-in management, these
switches provide seamless SNMP-based management capability.

Product Description
1-2
Figure 1-1 AT-3726XL, AT-3716XL, and AT-3714FXL (SC/ST) Switches
3701
100BASE-TX
X
MDA
B
100BASE-FX MIRROR PORT RS-232
TERMINAL PORT
STATUS
RESET
10BASE-FL PORT ACTIVITY
1357911
2AB 4 6 8 10 12
1357911
24681012
A
LINK LINK
ACTIVITY
FAULT
POWER
X
10BASE-FL ETHERNET SWITCH
with FAST ETHERNET 100BASEACCESS
TX RX TX RX TX RX TX RX TX RX TX RX
TX RX
AT-3726XL
AT-3716XL
AT-3714FXL (ST)
MDA
B
100BASE-FX MIRROR PORT RS-232
TERMINAL PORT
STATUS
RESET
10BASE-FL PORT ACTIVITY
1357911
2AB 4 6 8 10 12
1357911
24681012
A
LINK LINK
ACTIVITY
FAULT
POWER
X
10BASE-FL ETHERNET SWITCH
with FAST ETHERNET 100BASE ACCESS
TX RX TX RX TX RX TX RX TX RX TX RX
TX RX
AT-A11
100BASE-FX/SC
RXTX
AT-A11 (optional MDA)
MDA
B
100BASE-TX MIRROR PORT RS-232
TERMINAL PORT
STATUS
RESET
10BASE-T PORT ACTIVITY
1 3 5 7 9 11 13 15
2AB 4 6 8 10 12 14 16
X
A
1X3X5X7X
2X4X6X8X
9X11X13X15X
10X12X14X16X
LINK LINK
ACTIVITY
FAULT
POWER
X
10BASE-T ETHERNET SWITCH
with FAST ETHERNET 100BASE ACCESS
AT-A21
100BASE-FX/VF
X
MDA
B
100BASE-TX MIRROR PORT RS-232
TERMINAL PORT
STATUS
RESET
10BASE-T PORT ACTIVITY
1 3 5 7 9 11 13 15 17 19 21 23
2AB 4 6 8 10 12 14 16 18 20 22 24
X
A
1X3X5X7X
2X4X6X8X
9X11X13X15X
10X12X14X16X
17X19X21X23X
18X20X22X24X
LINK LINK
ACTIVITY
FAULT
POWER
X
10BASE-T ETHERNET SWITCH
with FAST ETHERNET 100BASE ACCESS
AT-A20
100BASE-FX/MT
X
AT-A20 (optional MDA)
AT-3714FXL (SC)
AT-A10 (optional MDA)
AT-A21 (optional MDA)

AT-3726XL, AT-3716XL, and AT-3714FXL Installation Guide
1-3
Physical Description
The switches have the following major front panel components:
#24 or 14 Ethernet 10Base-T RJ45 ports (AT-3726XL,
AT-3716XL); 12 Ethernet 10Base-FL (SC/ST) ports (AT-3714FXL)
#Optional MDA - 100Base-X port can be configured either with
10/100Base-TX (RJ45, AT-A10) connector, 100Base-FX (SC, AT-
A11) connector, 100Base-FX (MT-RJ, AT-A20) connector or
100Base-FX (VF-45, AT-A21) connector
#Port Mirroring on 10Base-T RJ45 port
#One Fast Ethernet 100Base-TX RJ45 port (AT-3726XL,
AT-3716XL); 100Base-FX (SC) for AT-3714FXL
#RS232 (DB9) connector (out-of-band configuration via Local
Omega)
#Reset button
#System and port status LEDs

Product Description
1-4
Hardware Features
The switches have the following major hardware features:
#24 or 16 10Base-T ports for the AT-3726XL/AT-3716XL, plus
one built-in 10/100Base-TX port capable of full- or half-duplex
configurable through auto-negotiation (IEEE 802.3u standard)
or manually settleable.
#12 10Base-FL ports (SC/ST) for the AT-3714FXL, capable of full-
or half-duplex, manually configurable.
#Additional 100Base modular port provides the option of a
100Base-TX or 100Base-FX port using one of the MDAs.
#Non-blocking, clear-channel architecture delivers wire-speed
bridging and delivers up to 880 Mbps aggregate bandwidth
for AT-3726XL, up to 720 Mbps for the AT-3716XL, and up to
640 Mbps for the AT-3714FXL to workstations, servers, routers
and between switches.
#Shared-memory architecture of up to 4 MB of packet buffer
using cost-effective EDO DRAM (dependent on model
number) which virtually eliminates packet loss.
#Store-and-forward switching mode allows for full error
checking.
#Hardware-base support for static entries and self-learning of
active MAC addresses and their associated Virtual LANs
(VLANs).
#Stores 2K MAC addresses in CAM.
#Port mirroring.
#VLANs configuration provides broadcast traffic control,
firewall protection, and simplifies adds, moves, and changes.
Supports thirty-two VLANs configurable by port or by tagging.
#Supports IEEE 802.1Q VLAN tagging.
#Half-duplex back pressure.
#Embedded 25 MHz 486 CPU supports management functions.
Sufficient system memory which includes DRAMs and Flash
memory for convenient firmware upgrades.
#In-band configuration of switch through Telnet, Remote
Omega.
#In-band configuration through web, web-based Omega.
#Out-of-band configuration through RS232 connector, Local
Omega.

AT-3726XL, AT-3716XL, and AT-3714FXL Installation Guide
1-5
Network Management Features
The switches have the following major network management
features:
#SNMP Management Information Base (MIB) II, SNMP MIB
extensions, Bridging MIB (RFC 1493), and Telnet support
deliver comprehensive in-band management
#Web-based management
#Local Omega, a menu-based management console, provides
detailed out-of-band configuration
#VLAN by port and 802.1Q VLAN tagging
#Embedded MIB statistics for enhanced traffic management,
monitoring, and analysis
#IEEE 802.1d Spanning Tree Protocol support for redundant
backbone connections and loop-free networks simplifies
configuration and improves fault tolerance
MAC Addressing The switch has hardware base support with Internal Address Lookup
Engine (IALE) for static entries and self-learning of active MAC
addresses. The switch supports 2K MAC addresses in CAM.
Store-and-
Forward Mode With store-and-forward switching mode, network administrators can
optimize performance and enable full-error checking.
The store-and-forward mode works in the following way. First, as the
packet is being received, it is placed in a buffer and held there until
the entire packet is received. The packet is also being checked for
errors and is not forwarded unless the entire packet is error-free. This
mode is automatic when data is exchanged between 10Base and
100Base ports.
Transmit Pacing Transmit pacing is enabled on a per port basis. When transmit pacing
is enabled, the switch alters its transmission routine during heavy
network activity. When the switch senses heavy traffic, it alters its
transmission routing by intentionally inserting additional delay
between transmission attempts. This added delay reduces collision
rates, thus reducing the number of transmission attempts, which
helps reduce CPU utilization, lightens overall network traffic, and
allows the network time to normalize before attempting
transmission.

Product Description
1-6
If this additional delay is not applied, the switch attempts to transmit
on an overloaded network, increasing the number of unsuccessful
transmission attempts.
For detailed information concerning software and management
features, refer to the AT- S20 User’s Guide.
Mirror Port The switch has a dedicated Mirror port. Administrators can use the
Omega software to configure the Mirror port and modes. The Mirror
port can monitor traffic on any port, one port at a time. A protocol
analyzer or an RMON probe can be connected to the port mirroring
connector using a standard Category 5 UTP cable.
In full-duplex mode the user needs to determine if they want to
monitor TX or only RX data, but in only one direction at a time. In
half-duplex mode, both RX/TX can be monitored simultaneously.
Media Dependent
Adapters (MDAs) The MDAs come in four versions, the AT-A10 which is the
10/100Base-TX adapter, the AT-A11 which is the 100Base-FX/SC
version, the AT-A20 which is the 100Base-FX/MT version and the
AT-A21 which is the 100Base-FX/VF version. The adapter LEDs, one
for Activity and the other for Link status, are located on the switch’s
front panel under Port Activity.
Figure 1-2 Media Dependent Adapter Faceplates
AT-A11
100BASE-FX/SC
RXTX
AT-A10
100BASE-TX
X
AT-A21
100BASE-FX/VF
AT-A20
100BASE-FX/MT
XX
AT-A10 (TX) AT-A11 (FX/SC)
AT-A20 (MT-RJ) AT-A21 (VF-45)

AT-3726XL, AT-3716XL, and AT-3714FXL Installation Guide
1-7
Table 1-1 lists the features of the MDAs. For details concerning how
to install an adapter, see Chapter 2, Installing a Media Dependent
Adapter on page 2-11.
Table 1-1 Media Dependent Adapter Features
Adapter Supported
Cable Description
AT-A10 RJ45 10/100Base-TX RJ45
Ethernet port: auto-negotiated speed and duplex mode
10/100Base-T max. segment length: 330 ft (100 m), Category 5 UTP
AT-A11 Fiber SC 100Base-FX: multimode SC fiber connector
100Base Ethernet port
100Base-FX: max. segment length 1.25 mi (2 km) for full-duplex,
1351 ft (412 m) for half-duplex; 50/125 and 62.5/125 micron
multimode fiber
AT-A20 Fiber MT-RJ 100Base-FX: multimode MT-RJ fiber connector
100Base Ethernet port
100Base-FX: max. segment length 1.25 mi (2 km) for full-duplex,
1351 ft (412 m) for half-duplex; 50/125 and 62.5/125 micron
multimode fiber
AT-A21 Fiber VF-45 100Base-FX: multimode VF-45 fiber connector
100Base Ethernet port
100Base-FX: max. segment length 1.25 mi (2 km) for full-duplex,
1351 ft (412 m) for half-duplex; 50/125 and 62.5/125 micron
multimode fiber

Product Description
1-8
RS232 Connector
The RS232 connector provides out-of-band management through a
VT100 terminal or a terminal emulation program such as
HyperTerminal which is included with Microsoft ® Windows’ OS
using a straight-through serial cable.
Reset Button
This recessed button can be activated using the tip of a ball point
pen to reset the unit and run the power-on self tests.
AC Power Connector
The switch has a single power supply, which has autoswitch AC
inputs. The input voltage range is from 120-240 VAC, 50/60 Hz.

2-1
Chapter 2
Installing the Switch
The AT-3726XL, AT-3716XL, and AT-3714FXL switch is 1.5 Rack Unit
(RU) high and can be positioned on a desktop as a standalone unit or
rack-mounted in a standard 19-inch rack.
Verifying Switch Package Contents
Make sure the following hardware components are included in your
switch package. If any of the following items are missing or
damaged, contact your sales representative.
#AT-3726XL, AT-3716XL, or AT-3714FXL Switch
#2 mounting brackets
#6 flathead Phillips screws
#Power cord (Americas, Central Europe, or UK only)
#Quick Install Guide
#Translated Safety Information Booklet
#Warranty card

Installing the Switch
2-2
Safety Information
Refer to Appendix A for translated safety statements in your
language.
Warning
Electric Shock Hazard
To prevent ELECTRIC shock, do not remove cover. No user-service-
able 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.
"8
Laser
Warning Class 1 Laser product. "6
Laser
Warning Do not stare into the Laser beam. "7
Caution
Lightning Danger
DO NOT WORK on equipment or CABLES during periods of
LIGHTNING ACTIVITY. "9
Caution
Electrical—Type Class 1 Equipment
This Equipment Must Be Earthed. 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. "11
Caution
Electrical—Cord Notice
Use power cord, maximum 4.5 meters long, rated 5 amp minimum,
250V, made of HAR cordage molded IEC 320 connector on one end
and on the other end a plug approved by the country of end use.
"12
Caution
Air vents must not be blocked and must have free access to the
room ambient air for cooling. "13
Caution
Operating Temperature
This product is designed for a maximum ambient temperature of
40° C. "14
Caution
All Countries: Install product in accordance with local and National
Electrical Codes. "15