3Com TR User manual

®
http://www.3com.com/
S
UPER
S
TACK
II
™
S
WITCH
2000 TR
U
SER
G
UIDE
Version 4.0
Part No. 99032
Published October 1997

3Com Corporation
■
5400 Bayfront Plaza
■
Santa Clara, California
■
95052-8145
© 3Com Corporation, 1997. All rights reserved. No part of this
documentation may be reproduced in any form or by any means or used to
make any derivative work (such as translation, transformation, or
adaptation) without permission from 3Com Corporation.
3Com Corporation reserves the right to revise this documentation and to
make changes in content from time to time without obligation on the part
of 3Com Corporation to provide notification of such revision or change.
3Com Corporation provides this documentation without warranty of any
kind, either implied or expressed, including, but not limited to, the implied
warranties of merchantability and fitness for a particular purpose. 3Com
may make improvements or changes in the product(s) and/or the
program(s) described in this documentation at any time.
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If you are a United States government agency, then this documentation
and the software described herein are provided to you subject to the
following restricted rights:
For units of the Department of Defense:
Restricted Rights Legend: Use, duplication or disclosure by the
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the limitations set forth in 3Com Corporation’s standard commercial
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If there is any software on removable media described in this
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to you.
3Com, AccessBuilder, Boundary Routing, CardFacts, LanScanner,
LinkBuilder, NETBuilder, NETBuilder II, NetFacts, Parallel Tasking,
ViewBuilder, EtherDisk, EtherLink, EtherLink Plus, EtherLink II, SmartAgent,
TokenLink, TokenLink Plus, TokenDisk and Transcend are registered
trademarks of 3Com Corporation. 3TECH, CacheCard, FDDILink, FMS,
NetProbe, Star-Tek, SuperStack II are registered trademarks of 3Com
Corporation. 3ComFacts, Ask3Com, and CardBoard are service marks of
3Com Corporation.
CompuServe is a registered trademark of CompuServe, Inc.
Other brand and product names may be registered trademarks or
trademarks of their respective holders.
This guide was written, illustrated, and produced by Chris Flisher.

C
ONTENTS
A BOUT T HIS G UIDE
Introduction 1
How to Use This Guide 1
Conventions 1
Related Publications 2
1 O VERVIEW
About the SuperStack
™
II Switch 2000 TR 1-1
System Benefits 1-1
System Features 1-2
Summary of Features 1-3
Typical Applications of Token Ring Switching 1-4
Ring Segmentation 1-5
The Front Panel 1-6
RJ-45 Ports 1-7
Front Panel LEDs 1-7
LCD Display Buttons 1-7
The Rear Panel 1-8
Power Socket 1-9
Serial Number 1-9
Redundant Power System Connector 1-9
Reset Button 1-9
Console Port 1-9
Optional Slide-In Modules 1-9
The ATM Module 1-9
Benefits of an ATM 1-9
Summary of ATM Features 1-10
The FDDI Module 1-10
Benefits of FDDI 1-11
Summary of FDDI Module Features 1-11
The Token Ring-in-Fast Ethernet (TR-in-FE) Module 1-11
Benefits of TR-in-FE 1-11
Summary of TR-in-FE Module Features 1-12
Migrating to High-speed Technologies 1-13
High-speed Cascade Connectors 1-14
Token Ring Switching Concepts 1-14
Why Token Ring Switching? 1-14
Source Route Bridging (SRT) 1-14
Transparent Bridging (TP) 1-15
Bridge Table 1-15
Source Route Transparent Bridging 1-16
Spanning Tree 1-16
802.1d Spanning Tree 1-16
IBM Spanning Tree 1-16
Congestion Control 1-17
Forwarding Modes 1-17
VLANs 1-18
Advantages of VLAN 1-18
2 G ETTING S TARTED
Important Safety Information 2-1
Positioning the Switch 2000 TR 2-2
Considerations for Placement 2-2

Configuration Guidelines 2-3
Power Supply and Fuse 2-3
Replacing the Fuse 2-3
Installing the Slide-in Modules 2-3
Installing the Switch 2000 TR 2-5
Rack Mounting 2-5
Wall Mounting 2-5
Stack Mounting 2-5
Connecting Redundant Power System 2-6
Connecting to the Serial Port 2-6
Connecting a VT100 Terminal 2-6
Device Defaults 2-6
3 S ETTING U P FOR M ANAGEMENT
Switch 2000 TR Management Options 3-1
VT100 Management Interface 3-2
Via the Serial Port 3-2
Via an IP Network Connection 3-2
Configuring Switch 2000 TR in Stack 3-3
Head Unit 3-3
Cascade Connections 3-3
Managing over the Network 3-4
IP Addresses 3-4
Operating IP in a Closed Network 3-4
Obtaining Network Addresses 3-4
Management Prerequisites 3-5
Source Routing Prerequisites 3-6
Switch 2000 TR Management Consoles 3-6
The VT100 Console 3-6
Choice Field 3-6
Entry Field 3-7
Button 3-7
List Boxes 3-7
Key Board Shortcuts 3-7
Correcting Text Entries 3-8
Default Users 3-8
VT100 Console Menu Map 3-9
Setting Up the VT100 Console 3-10
Switch 2000 TR Management Setup Fields 3-11
MAC Address 3-11
Locally Admin Address 3-11
Work Group ID 3-12
Device IP Address 3-12
Device SubNet Mask 3-12
Default Router 3-12
SETUP TRAPS 3-12
SERIAL PORT 3-12
The LCD Console 3-13
LCD Console Buttons 3-13
Enter 3-13
Left Arrow 3-13
Right Arrow 3-13
Up Arrow 3-13
Down Arrow 3-13
LCD Console Menu Map 3-14
Setting Up the LCD Console 3-15
IP Address Setup 3-15
Setting Up BOOTP 3-16
Auto Logout 3-18
Upgrading Software 3-19
Upgrading Module Software 3-20
Resetting the Switch 2000 TR 3-21
VT100 Console Reset 3-21
LCD Console Reset 3-21
Reset Button 3-22
Power Cycle Reset 3-22

4 C ONFIGURING WITH THE VT100 I NTERFACE
Quick Setup 4-2
Bridge Configuration 4-3
Setting Source Routing Transparent (VT100) 4-3
Setting Source Route Bridging 4-4
Setting Transparent Bridging 4-4
Spanning Tree Fields 4-5
Spanning Tree Parameters 4-5
Port Configuration 4-6
Setting Up Ports 4-6
Setting the Port Admin. State 4-6
Setting VLAN ID 4-6
Setting Port Personality 4-7
Setting Port Priorities 4-7
Setting Congestion Control 4-7
Setting Port Speed 4-8
Setting Forwarding Mode 4-8
Dynamic Cut-Thru Threshold% 4-8
Setting the Locally Admin. Address 4-8
Setting Broadcast Storm Control 4-9
Rising Threshold% 4-9
Falling Threshold% 4-9
Rising Action 4-9
Falling Action 4-9
Port Bridge Configuration 4-10
I/O Module Configuration 4-11
Stack Configuration 4-11
Setting Up the Stack 4-11
Setting sysName 4-12
BOOTP Client 4-12
VLAN Configuration 4-12
Assigning a Port to a VLAN 4-13
Specifying a Backbone Port 4-13
Unit Configuration 4-14
Setting Up the Unit 4-14
Unit ID 4-14
Unit Name 4-14
Port Capacity 4-14
Option Slot 4-14
Power Supply 4-14
Power On Self Test 4-15
Roving Analysis 4-15
Administrative Configuration 4-15
Setting Local Security 4-16
Creating New Users 4-17
Deleting Users 4-17
Editing Users and Changing Passwords 4-18
About the Switch Database (SDB) 4-19
Database Entries 4-19
Database Entry Methods 4-19
Switch Database Configuration 4-20
Adding Entries to the Database 4-21
Deleting Entries from the Database 4-21
Finding Entries in the Database 4-21
SNMP Trap Configuration 4-21
Serial Port Configuration 4-22
Connection Type 4-23
DCD Control 4-23
DSR Control 4-23
Flow Control 4-23
Auto Config 4-23
Speed 4-23
Char Size 4-23
Parity 4-23
Stop Bit 4-23
Initializing the Switch 2000 TR 4-24

5 C ONFIGURING WITH THE LCD C ONSOLE
Unit Configuration 5-1
Bridge Configuration 5-2
Port Configuration 5-3
Setting Port ID 5-3
Viewing Link State 5-3
Setting Port State 5-4
Setting Speed 5-4
Setting Port Personality 5-5
I/O Module Configuration 5-5
6 M ONITORING THE S WITCH 2000 TR
Locating Statistics 6-1
Unit Statistics 6-2
Port Statistics 6-3
Port Statistics (Traffic) 6-4
Stack Status 6-6
Status 6-7
Fault Log 6-8
Remote Polling (PING) 6-9
LCD Status 6-10
7 V IRTUAL LAN S
What are VLANs? 7-1
Benefits of VLANs 7-2
How VLANs Ease Change and Movement 7-2
How VLANs Control Broadcast Traffic 7-2
How VLANs Provide Extra Security 7-2
VLANs and the Switch 2000 TR 7-3
The Default VLAN and Moving Ports From the Default
VLAN 7-3
Connecting VLANs to a Router 7-3
Connecting Common VLANs Between Switch Units 7-4
Using Non-routable Protocols 7-4
Using Unique MAC Addresses 7-4
Extending VLANs into an ATM Network 7-4
Example 1 7-4
A S OFTWARE U PGRADE U TILITY
Software Upgrade Utility Command Set A-1
Starting the Software Upgrade Utility A-2
Using the Commands A-3
Resetting to Factory Defaults A-3
Downloading a New Software Image A-3
After the Download A-3
Status Messages A-4
B S CREEN A CCESS R IGHTS
Access Rights Table B-1
C S ERIAL P ORT C ABLE P IN - OUTS
Null Modem Cable C-1
Cabling for Module Options C-1
D T ROUBLESHOOTING
Troubleshooting Procedures D-1
E S WITCH 2000 TR
T
ECHNICAL S PECIFICATIONS
Specifications for Module Options E-2

F T ECHNICAL S UPPORT
Online Technical Services F-1
World Wide Web Site F-1
3Com Bulletin Board Service F-1
Access by Analog Modem F-1
Access by Digital Modem F-2
3ComFacts Automated Fax Service F-2
3ComForum on CompuServe Online Service F-3
Support from Your Network Supplier F-3
Support from 3Com F-3
Returning Products for Repair F-4
3C OM C ORPORATION L IMITED W ARRANTY

A
BOUT
T
HIS
G
UIDE
Introduction
This guide provides the information you need to
install and configure the SuperStack II™ Switch 2000
TR (3C510600) into your Token Ring network for
maximum benefit.
This guide is intended for use by network administra-
tors responsible for installing and setting up network-
ing equipment. It assumes a basic working
knowledge of Local Area Networks and Token Ring in
particular.
NOTE: If the information in the release notes shipped
with the Switch 2000 TR differs from the information
in this guide, follow the release notes.
How to Use This Guide
This table lists where specific information can be found.
Conventions
The following tables list icon and text conventions
that are used throughout this guide.
Chapter Information
1 Overview
2 Getting Started
3 Setting Up Management
4 Configuring with the VT100 Interface
5 Configuring with the LCD Console
6 Monitoring the Switch 2000 TR
7 Virtual LANs
Appendix
A Software Upgrade Utility
B Screen Access Rights
C Serial Port Cable Pin-outs
D Troubleshooting
E Technical Specifications
F Technical Support

2 A
BOUT
T
HIS
G
UIDE
Related Publications
Within the Switch 2000 TR document set:
■
Switch 2000 TR Quick Reference Guide. (Part
Number #99033)
■ Switch 2000 TR User Guide. (Part Number #99032)
■
Switch 2000 TR Release Notes. (Part Number
#99034)
■
SuperStack II Switch 2000 TR ATM OC-3 Module
User Guide (Part Number #99041)
■ SuperStack II Switch 2000 TR FDDI Module User
Guide (Part Number #99048)
■
SuperStack II Switch 2000 TR TR-in-FE Module
User Guide (Part Number #99045)
Table 1 Notice Icons
Icon Type Description
Information
Note Information notes call attention to impor- tant features or instructions.
Caution Cautions contain directions that you must
follow to avoid immediate system damage
or loss of data.
Warning Warnings contain directions that you must
follow for your personal safety. Follow all
instructions carefully.
Table 2 Text Conventions
Convention Description
Italics Italics are used for emphasis or to denote new terms.
“Enter” vs.
“Press” The word “enter” means to type something and then press the Return or Enter key. Do not press the Return
or Enter key when an instruction simply says “press.”
Text repre-
sented as
screen
display
This typeface is used to represent displays that
appear on your terminal screen; for example:
Select a menu option
Keys When specific keys are referred to in the text, they are
called out by their labels, such as the “Return key” or
the “Escape key,” or they may be shown as [Return]
or [Esc].
If two or more keys are to be pressed simultaneously,
the keys are linked with a plus sign (+); for example:
Press [Ctrl]+[Alt]+[Del].

1
O
VERVIEW
This chapter describes the major features, compo-
nents, and concepts of the Switch 2000 TR, including:
■
About the SuperStack™ II Switch 2000 TR
■
Summary of Features
■
Typical Applications of Token Ring Switching
■
The Front Panel
■
The Rear Panel
■
Optional Slide-In Modules
■
Token Ring Switching Concepts
About the SuperStack
™
II Switch 2000 TR
The SuperStack II Switch 2000 TR is a multiport inter-
networking switch for Token Ring networks.
Designed to satisfy the high demand for bandwidth in
expanding Token Ring networks while preserving the
investment in existing equipment, the Switch 2000 TR
provides a natural migration path for network growth
and high-speed technologies, including ATM and
FDDI.
The Switch 2000 TR is a 12-port Token Ring stackable
switch that supports throughput rates of more than
400,000 packets per second. Designed to fit comfort-
ably within the data center or the workgroup environ-
ments, the Switch 2000 TR supports up to 72 rings
per stack at 4 or 16 Mbps.
System Benefits
■ Network segmentation —When used in place of
low- performance PC bridges or routers, the
Switch 2000 TR provides a simple method for seg-
menting Token Ring networks into smaller, more
manageable workgroups.
■
Increased bandwidth —A key benefit of segmen-
tation is reduced traffic load, which translates into
increased bandwidth and improved manageability.

1-2 CHAPTER 1: OVERVIEW
■Port population—High density port population
relieves traffic congestion and supports 4 and 16
Mbps data rates. In addition, the Switch 2000 TR
has four custom-configurable ports designed for
direct workstation or dedicated server connection.
■Network management—Switch 2000 TR is sup-
ported by the Transcend®Enterprise Manager
applications for UNIX and Microsoft Windows
95®. Both network management applications pro-
vide Simple Network Management Protocol
Remote Monitoring Management Information
Base (SNMP RMON MIB) data using an intuitive
graphical interface to report historical and perfor-
mance statistics.
System Features
■Congestion Control—The Congestion Control
feature optimizes available buffer space in the
Switch 2000 TR by using the buffering ability in all
Token Ring end stations. This is especially useful
when many ports are transmitting to a common
port such as a server connection. Having conges-
tion control eliminates the chances of dropped
packets in high-traffic client-server environments.
■Slide-in Option Slot—Optional downlink mod-
ules are available for the Switch 2000 TR. These
modules provide downlinks to high-speed back-
bones such as FDDI, ATM, and Fast Ethernet.
■The FDDI module supplies a 100 Mbps point of
aggregation for multiple Token Ring switched
segments and supports either Single Attached
Stations (SAS) or Dual Attached Stations (DAS).
■The ATM module supplies 155 Mbps UNI inter-
face, and retains all virtual LAN emulation con-
figuration data, provides ATM signaling, and
offers standard LAN emulation.
■The TR-in-FE module combines Token Ring and
Ethernet for the purpose of utilizing Fast Ether-
net as a backbone and method of server attach-
ment for Token Ring networks. Through a
process known as tunneling or encapsula-
tion, TR-in-FE uses Fast Ethernet to transport
natively formatted Token Ring frames.
■High-speed Cascade Interface—The high-speed
cascade interface enables multiple Switch 2000
TRs to connect to form a single, large switched
domain while reducing the cost typically incurred
with FDDI or ATM functionality. This connection
allows as many as six Switch 2000 TRs to be
stacked.
■VLAN Support—The Switch 2000 TR supports vir-
tual LAN (VLAN) operation by allowing any switch
port to become a member of any one of 15 unique
VLANs (workgroups). By establishing VLANs, LAN
administration tasks such as adds, moves, and
changes become easier while bulk downloads and
configurations remain across workgroups. VLANs
also enhance security and increase network effi-
ciency by controlling traffic flow and containing
broadcasts. VLANs are preserved over the High
Speed Cascade Interface. In addition, indus-
try-standard LAN emulation over ATM provides a
method for creating enterprise-wide virtual LANs
that reflect how networks actually function.

Summary of Features 1-3
■Roving Analysis—The Roving Analysis Port (RAP)
feature allows you to configure the SuperStack II
Switch 2000 TR to capture and monitor traffic on
any Token Ring LAN connected to the switch using
any industry-standard LAN analyzer.
This feature operates on Port 1 of the Switch 2000
TR and applies to all ports of the same switch. To
view traffic on other switches in a stack you must
connect to Port 1 of the appropriate switch and
select the port you wish to view.
Figure 1-1 Roving Analysis
Summary of Features
■12 switched shielded RJ-45 Token Ring ports
■4 ports selectable for direct end station attachment
■High-speed cascade interface
■Front Panel LCD Console for fast configuration
■Flexible Option Slot for FDDI, ATM, or TR-in-FE
expansion
■400,000 packet-per-second aggregate forwarding
rate
■Cut-Thru, Store-and-Forward, or Dynamic Cut-thru
modes
■Low latency in cut-through mode
■No forwarded errors propagated in
store-and-forward mode
■Dynamic Cut-thru monitors error rates and
selects Cut-thru or Store and Forward as appro-
priate
■Source route, transparent, and SRT bridging modes
supported
■IBM and 802.1d Spanning Tree protocols sup-
ported with configurable BPDU addresses for addi-
tional flexibility
■Congestion Control
■SNMP network management support
■Transcend®Enterprise Manager for HP Open-
View, NetView/6000, SunNet Manager,
Microsoft®Windows 95
■SmartAgent support
green =linkOK
yellow =MGMTpartition
flashingyellow =autoerror partition
off =inactive
LINKSTATUS
6x
7x
1x
12x
1
ENTER
23456
12345 6
78910 11 12
78910 11 12
Status—
Status—
Packet—
Packet—
OC
O C
OptionSlot
Cascade
Power
MGMT
SuperStackII
Switch2000 TR
Network Analyzer
Ring to be monitored
Switch 2000 TR Port 1
(configured as Hub port)
Switch 2000 TR Port 12

1-4 CHAPTER 1: OVERVIEW
■SNMP over IP
■SNMP MIB II
■Bridge MIB
■SR Bridge MIB
■BOOTP
■Switch 2000 TR Private (3Com Private)
■Part of SuperStack™II architecture
■Redundant Power System
■Uninterruptable Power Supply
■Integrated network management
■One RS-232 DB-9 connector for local configura-
tion
Typical Applications of Token Ring Switching
Token Ring switches are best suited for, although not
limited to, expanding Token Ring networks. These
networks demand high bandwidth, performance,
monitoring, management, and a logical migration
path for the continued growth of the network while
preserving your investment in existing infrastructure.
Offering a significant advantage over traditional
inter-networking equipment, Token Ring switches
bring immediate relief to networks, solving through-
put and management problems. By replacing low per-
formance two-port PC bridges or routers, Token Ring
switching provides the ability to perform Source
Route bridging, transparent bridging, or both with
Source Route Transparent (SRT) bridging. The follow-
ing illustrations depict some possible uses of the
Switch 2000 TR, including ring segmentation and
migration to high-speed technologies.

Ring Segmentation 1-5
Ring Segmentation
High-speed switches offer a more efficient solution over 2-port PC bridges or routers. As illustrated below, segmentation
with a Token Ring switch brings immediate improvement over existing networks by re-distributing traffic
.
Figure 1-2 Using Switch 2000 TR to Segment Network
SuperStack II Switch 2000 TRs
SuperStack II Hub TR
SuperStack II Hub TR
SuperStack II Hub TR
SuperStack II Hub TR
NETBuilder II
Direct attach Workstations/Servers
Connected with high-speed cascade
16 Mbps
16 Mbps
4 Mbps
16 Mbps
16 Mbps
Server
Server
16 Mbps

1-6 CHAPTER 1: OVERVIEW
The Front Panel
This section describes the front panel components and LEDs of the SuperStack II Switch 2000 TR. Figure 1-3 shows the front
panel.
Figure 1-3 SuperStack II Switch 2000 TR Front Panel RJ-45 Ports
green =link OK
yellow =MGMT partition
flashing yellow =auto error
off =inactive
Link Status
6
7
1
12
SuperStack II
Switch 2000 TR
1
ENTER
23456
12345 6
78910 11 12
78910 11 12
12 x RJ-45 ports
Status and Activity LEDs
Cascade
Status LEDs
Option Slot
Status LEDs
LCD Status Display
Status —
Status —
Packet—
OC
O C
Option Slot
Cascade
Power
MGMT
Power LED
MGMT LED
LCD Control Buttons
Packet—

The Front Panel 1-7
RJ-45 Ports
12 RJ-45 ports support unshielded Twisted Pair (UTP)
or Shielded Twisted Pair cabling (STP) at 4 Mbps or 16
Mbps wire speed.
All 12 ports default to adapter mode for connection
to a Token Ring hub. Additionally, ports 1 through 4
can be configured to hub mode to allow direct
attachment of workstations or servers.
Front Panel LEDs
The LEDs on the front panel of the Switch 2000 TR
reflect the current status of the switch. Use Table 1-2
to interpret the LED states. LCD Display Buttons
Use the LCD display on the front panel of the Switch
2000 TR to select ports, change system parameters,
receive status information, and set the Unit ID num-
ber.
■Right and Left buttons—Change or move
digits or go to the previous menu.
■Up and Down buttons—Scroll up or down in
specific menu and increase or decrease digit
value.
■Enter button—Enter a menu or use to enter
the edit mode.
I
Figure 1-4 LCD Display Buttons
Table 1-1 LED States
LED Name Color Indicates
Packet LEDs Green Traffic present
Flashing yel-
low Error frames present
Status LEDs Green Port inserted
Yellow Partitioned via management
Flashing yel-
low Auto Error Partition
Off Port not inserted
Option Slot
Sta-
tus/Packet
Green Presence of Option card
Flashing green Activity on link
Cascade
Status/
Packet
Green Cascade connection present
Flashing green Activity on link
Power Green Power ON
Yellow RPS w/alarm
MGMT Off Operation normal
Flashing green (slow) Software download
Flashing green (fast) Power On Self Test
(POST)
Yellow POST has failed
Table 1-1 LED States
LED Name Color Indicates
ENTER

1-8 CHAPTER 1: OVERVIEW
The Rear Panel
This section describes the rear panel components of the Switch 2000 TR. Figure 1-5 shows the rear panel.
Figure 1-5 Switch 2000 TR Rear Panel
* Refer to the appropriate module installation manual for more information.
IEC Power Socket
and Fuse Holder Redundant Power
System Connector
Serial Number Optional Slide-In Module Slot*
Reset
RS-232 Console
Reset Button High-Speed Cascade Connectors

Optional Slide-In Modules 1-9
Power Socket
The Switch 2000 TR automatically adjusts to the
supply voltage. The fuse is suitable for both 110 AC
and 220-240 AC operation. Refer to “Replacing the
Fuse in Chapter 2 for information on replacing fuses.
NOTE: The Switch 2000 TR has no ON/OFF switch.
Serial Number
Refer to this number if you need to report a fault.
Redundant Power System Connector
Use this connector to attach a Redundant Power
System (RPS) to the Switch 2000 TR. Disconnect the
AC plug when using an RPS.
Reset Button
Using the Reset button simulates a power on/off
cycle. You can also perform a software reset using the
VT100 interface. Refer to “Setting Up the VT100
Console in Chapter 3.
Console Port
Use the RS-232 console port for connecting a termi-
nal for serial remote or local out-of-band manage-
ment and configuration. Use the following settings to
configure the VT100:
■9600 baud
■8 bit
■No parity
■1 stop bit
Optional Slide-In Modules
Option modules provide alternate downlinks for the
Switch 2000 TR.
NOTE: Be sure the filler plate cover is installed when
the module slot is not occupied.
Slide-in modules are available for the following:
The ATM Module
The SuperStack II Switch TR ATM OC-3 module pro-
vides a high-speed ATM connection between the
Switch 2000 TR and ATM networks. When positioned
in workgroup or departmental LANs, the ATM down-
link module offers a 155 Mbps data path to building,
campus or ATM network backbones directly from the
Switch 2000 TR. Perfect for providing cost-effective
ATM access to smaller isolated LANs or bandwidth
intensive and mission critical applications, the ATM
downlink also provides a logical migration path for
existing Token Ring LANs to mainstream high-speed
networking technologies.
Redundant links can protect your Switch 2000 TR
from network failure or equipment inconsistencies.
The built-in Software Upgrade feature allows you to
download software revisions easily.
Benefits of an ATM
ATM is the only computer networking technology
designed to carry video, voice and data traffic simul-
taneously. ATM provides the level of service necessary

1-10 CHAPTER 1: OVERVIEW
to run each of these bandwidth-intensive applications
across networks.
The primary benefits of ATM include:
■ATM is a cell-based communications technology
that easily scales from T1 or ATM 25 to OC-3 (155
Mbps), OC-12 (622 Mbps), OC-48 (2.488 Gbps),
and OC-192 (10 Gbps).
■Additional services are easily added to existing
ATM networks.
■ATM networks are designed for growth and pro-
vide future scalability.
■ATM provides LAN Emulation (LANE) technology
which provides interoperability between existing
Token Ring, Ethernet, and ATM devices.
Summary of ATM Features
The following list summarizes the features of the
SuperStack II Switch 2000 TR ATM module.
■Conforms to ATM Forum Standards
■Meets OC-3c 155 Mbps interface
■SONET (STS 3c) and SDH (STM-1) compliant
■Multimode Fiber, SC connections
■LAN Emulation (LANE) version 1.0
■16 Emulated LAN Clients
■512 Virtual Circuits
■1024 remote MAC addresses
■User-to-Network Interface (UNI) 3.1
■Interim Local Management Interface (ILMI)
■AAL5 ATM Adaptation Layer
■16 Virtual LANs (VLANs)
■Data buffer to store 40,000 ATM cells
■Wire Rate Transmission on ATM port
■Low Latency (68 microseconds between ATM and
Token Ring components).
■3Com SmartAgent support, including:
■SNMP management using 3Com’s Transcend
Enterprise Manager.
■Telnet management using VT100 interface.
The FDDI Module
The SuperStack II Switch TR FDDI module provides a
high-speed connection between the Switch 2000 TR
and FDDI backbone networks. When positioned in
workgroup or departmental LANs, the FDDI downlink
module offers a 100 MB data path to building,
campus or FDDI network backbones directly from the
Switch 2000 TR. Perfect for providing cost-effective
FDDI access to smaller isolated LANs or bandwidth
intensive and mission critical applications. The FDDI
downlink also provides a logical migration path for
existing Token Ring LANs to mainstream networking
technologies.
Redundant links can protect your Switch 2000 TR
from network failure or equipment inconsistencies.
The built-in Software Upgrade feature allows you to
download software revisions easily.