3Com S330 User manual

http://www.3com.com/
¨
SuperStack
®
II
PathBuilder
®
S330/S310
WAN Access Switches Reference Guide
Release 2.03
Part No. 010-11941-0004
Published December 1998

3Com Corporation
5400 Bayfront Plaza
Santa Clara, California
95052-8145
Copyright © 1998, 3Com Corporation. 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 written 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, term, or condition of any kind, either
implied or expressed, including, but not limited to, the implied warranties, terms or conditions of
merchantability, satisfactory quality, 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.
If there is any software on removable media described in this documentation, it is furnished under a license
agreement included with the product as a separate document, in the hard copy documentation, or on the
removable media in a directory file named LICENSE.TXT or !LICENSE.TXT. If you are unable to locate a copy,
please contact 3Com and a copy will be provided to you.
UNITED STATES GOVERNMENT LEGEND
If you are a United States government agency, then this documentation and the software described herein
are provided to you subject to the following:
All technical data and computer software are commercial in nature and developed solely at private expense.
Software is delivered as “Commercial Computer Software” as defined in DFARS 252.227-7014 (June 1995)
or as a “commercial item” as defined in FAR 2.101(a) and as such is provided with only such rights as are
provided in 3Com’s standard commercial license for the Software. Technical data is provided with limited
rights only as provided in DFAR 252.227-7015 (Nov 1995) or FAR 52.227-14 (June 1987), whichever is
applicable. You agree not to remove or deface any portion of any legend provided on any licensed program
or documentation contained in, or delivered to you in conjunction with, this User Guide.
3Com, the 3Com logo, PathBuilder, and SuperStack are registered trademarks of 3Com Corporation.
3ComFacts is a service mark of 3Com Corporation.
All other company and product names may be trademarks of the respective companies with which they are
associated.

C
ONTENTS
W
ARNING
I
NFORMATION
Servicing ix
Rack Mounting ix
Power and Power Cords x
EMI x
Safety Classification of Ports for Connection to Telecommunications Networks x
S
UPPLEMENTARY
R
EGULATORY
I
NFORMATION
FCC Part 68 Statement xi
Canadian CS-03 Approval Information xi
CE Notice xii
A
BOUT
T
HIS
G
UIDE
Introduction 1
How to Use This Guide 1
Conventions 2
Related Documentation 2
1
S
YSTEM
D
ESCRIPTION
PathBuilder S330 Features 3
PathBuilder S310 Features 5
Application Support 7
Key Benefits 7
Specifications 8
Options and Parts List 27
2 I
NSTALLATION
Installation Overview 30
Site Requirements 32
Installation Procedures 33
Step 1 (Optional): Install the Optional Modules in the Unit 33
Installing the Optional Modules in the Unit 35
Step 2: Install the Unit in the Rack 37
Step 3: Connect AC or DC Power and (optionally) the RPS System 38
Installing the Optional RPS System 39

Step 4: Connect I/O Cabling 40
Connecting to the T1/E1 UNI Interface 42
Connecting to the Serial Port 42
Connecting to the Ethernet Port 51
Connecting to the OC3/STM-1 Port 52
Connecting to the CBR Module 53
Connecting to the Voice Compression Module 55
Connecting to the DS3/E3 Module 56
Step 5: Connect the Management Terminal 57
3 G
ETTING
S
TARTED
Using the Menus 61
Navigating through the Menus 61
Understanding the Menu Hierarchy 61
Using the Menus to Change Settings 62
Alarm Indicator 62
Performing Initial System Configuration 63
Configuring the System Clock 63
Setting up Communication Parameters 64
Configuring the Local Host IP Address 65
Configuring Trap Clients 67
Configuring the Default Gateway 68
Setting the Time and Date 69
Setting up Passwords 69
Performing Additional Super User Functions 71
Taking over a Read-Write Session 71
Erasing the System Database 71
Configuring In-band Management 72
4
C
ONFIGURING
P
ATH
B
UILDER
S330/S310 M
ODULES
, P
ORTS
,
AND
A
PPLICATIONS
Specifying General System Information 76
Viewing RS-232 Port Configuration Information 77
Viewing the Firmware Version 77
Downloading New Management Processor Firmware 78
Downloading via the Ethernet Port 79
Downloading via the Serial Port 79
Updating the Flash File System 80
Resetting the Interface Card 80
Viewing an Equipment List 80
Using the Configuration Management Menu 81
Using the List Card Menu 82
Configuring the Management CPU 82
Viewing MCPU Configuration Information 83
Configuring MCPU Shapers 83
Configuring the CTX 85
Configuring CTX Shapers 85

Configuring CTX Buffers 86
Setting Congestion Thresholds 88
Configuring Ports 88
Configuring the T1/E1 Interface 89
Configuring the T1/E1 Ports 89
Activation/Deactivation Bit Error Rates 91
Configuring UNI and IMA Groups 92
Adding UNI Groups 92
Adding IMA Groups 94
Viewing and Modifying IMA and UNI Groups 97
Deleting IMA and UNI Groups 97
Viewing IMA Link Status 98
Viewing IMA Group Status 100
Configuring the T1/ E1 Card 103
Configuring the OC3/STM-1 Port 104
Configuring the DS3/E3 UNI Module 105
Configuring the Serial Interface 106
Configuring the Serial Port 107
Configuring the Serial Card 110
Configuring the Ethernet Interface 110
Configuring the Ethernet Port 110
Configuring the Ethernet Card 111
Configuring the Bridge 112
Configuring Source Protocol Filtering 114
Configuring Source Address Filtering 116
Configuring Destination Address Filtering 118
Viewing the List Forwarding Table 119
Constructing the Bridge Static Table 120
Enabling and Disabling the Spanning Tree 121
Configuring the CBR Module 121
Configuring the CBR T1-DSX/E1 Port(s) 121
DS0 Trunk Conditioning 126
Configuring the CBR Serial Port 126
Configuring the CBR Card 128
Configuring the Voice Compression Module 129
Configuring VCM DS0 Channels 129
Configuring the VCM T1/E1 Port 130
Configuring the VCM Card 133
Configuring Virtual Circuits 133
Supported Classes of Virtual Circuits 134
Adding Virtual Circuits 134
Adding PVC Virtual Circuits 136
Configuring CBR Circuits for DBA 139
Defining RS366 (Video) Virtual Circuit Templates 141
Adding Voice Compression Module VCC Circuits 145
Adding VCM Subchannel Circuits 147
VCM Subchannel Virtual Circuit Example 149

Virtual Circuit Parameters 151
Common VIrtual Circuit Parameters 151
MCPU Virtual Circuit Parameters 151
T1/E1 UNI Port Virtual Circuit Parameters 151
OC3/STM-1 Port Virtual Circuit Parameters 151
Serial Port Virtual Circuit Parameters 151
Ethernet Port Virtual Circuit Parameters 154
CBR Module Virtual Circuit Parameters 154
Voice Compression Module Virtual Circuit Parameters 156
VC and VP Address Translation 156
Viewing Existing Virtual Circuits 156
Viewing Virtual Circuits for the Entire Chassis 156
Viewing Virtual Circuits by Port or Group 158
Modifying Existing Virtual Circuits 159
Deleting Virtual Circuits 160
Managing the Video Dial Feature 160
Managing Video Dial-up Sessions 161
Starting Video Dial-up Sessions 161
Ending Video Dial-up Sessions 162
Viewing the Video Call Routing Table 162
5
P
ATH
B
UILDER
S330 D
IAGNOSTICS AND
P
ERFORMANCE
S
TATISTICS
Managing System Alarms 165
Viewing and Clearing Current Alarms 165
PathBuilder S330/S310 Alarm Messages 166
MCPU and CTX Module (System) Alarms 167
Alarms Common to Several Interfaces 169
DS1/E1 UNI Module Alarms 171
DSX-1/E1 CBR Module Alarms 176
SIM Alarms 177
Voice Compression Module Alarms 177
Working with History Alarms 178
Viewing and Printing History Alarms 178
Clearing History Alarms 178
Using Loopbacks 179
T1/E1 UNI Loopbacks 180
OC3/STM-1 Loopbacks 181
DS3 Loopbacks 181
E3 Loopbacks 182
CBR Loopbacks 182
Setting VCM Loopbacks 183
Setting VCM Port Loopbacks 183
Setting VCM Channel Loopbacks 183
Viewing Performance and ATM Statistics 185
Viewing Card Statistics 185

Viewing T1/E1 UNI Card Statistics 186
T1/E1 Port/Link Statistics 187
T1/E1 Group Statistics 188
Viewing OC3/STM-1 Card Statistics 189
Viewing OC3/STM-1 Performance Statistics 189
Viewing OC3/STM-1 ATM Statistics 191
Viewing DS3 Card Statistics 192
Viewing DS3 UNI Performance Statistics 192
Viewing DS3 UNI ATM Statistics 192
Viewing E3 Card Statistics 193
Viewing E3 UNI Performance Statistics 193
Viewing E3 UNI ATM Statistics 193
Viewing SIM Card Statistics 193
SIM HDLC Statistics 194
SIM Frame Relay Statistics 194
SIM ATM VC Statistics 194
Viewing Ethernet Card Statistics 195
Ethernet Statistics 195
Spanning Tree Statistics 196
Viewing CBR Module Card Statistics 197
CBR Performance Monitoring Statistics 197
CBR ATM Statistics 198
Viewing Voice Compression Module Statistics 199
Voice Compression Module Performance Monitoring Statistics 199
Voice Compression Module VC Statistics 200
Voice Compression Module Port Activity Statistics 200
Viewing Virtual Circuit Statistics 200
Viewing Virtual Circuit Statistics by Circuit 201
Viewing Virtual Circuit Statistics by Port/Group 202
Viewing Virtual Circuit Statistics by Shaper 202
Viewing Virtual Circuit Statistics by Buffer (Queue) 204
A
T
ECHNICAL
S
UPPORT
Online Technical Services 205
World Wide Web Site 205
3Com FTP Site 205
3Com Bulletin Board Service 206
Access by Analog Modem 206
Access by Digital Modem 206
3ComFacts Automated Fax Service 206
Support from Your Network Supplier 206
Support from 3Com 207
Returning Products for Repair 208

B
P
ATH
B
UILDER
S330/S310 M
ODULE AND
A
PPLICATION
O
VERVIEW
Management CPU 209
CTX Switch 209
CTX Output Queues and Memory Partition 210
Setting up a Virtual Circuit 211
VPI and VCI Ranges 212
Early and Partial Packet Discard 212
T1/E1 UNI Interface 212
OC3/STM-1 Port 213
DS3/E3 UNI Modules 213
Serial Interface 214
Serial Interface Frame Protocol Modes 214
ATM DXI Mode 215
HDLC/SDLC Mode 219
Frame Relay Mode 219
Ethernet Interface 222
Bridge Operation 223
Filtering 223
Spanning Tree 224
Spanning Tree Operation 224
Spanning Tree Instances 225
Addressing 225
Segmentation 228
Reassembly 228
Typical Ethernet and Voice Application Configurations 228
CBR Module 231
Structured DS1 233
DS0 Signaling and Dynamic Bandwidth Allocation 234
Unstructured DS1 237
Structured versus Unstructured Summary 237
Video Conferencing 238
Point-to-Point Video Conferencing 238
Multi-point Video Conferencing 240
Voice Compression Module 241
Supported Voice Compression Features 242
I
NDEX
3C
OM
C
ORPORATION
L
IMITED
W
ARRANTY

W ARNING I NFORMATION
This section contains warning information for AC-powered systems.
CAUTION: Use of controls or adjustments of performance or procedures other
than those specified herein may result in hazardous radiation exposure.
CAUTION: Danger of explosion if battery is incorrectly replaced. Replace the
battery with only the same or equivalent type as that recommended by the
manufacturer. Dispose of used batteries according to the manufacturer’s
instructions.
Servicing Service of this unit is to be performed by qualified service personnel only.
Service of certain components and subassemblies in this equipment is
accomplished by the replacement of Field Replaceable Units (FRUs). However,
safety agency approval requires that the servicing of other subassemblies within
this product be referred to 3Com’s service personnel.
The trim enclosure and other mechanically secured plates serve as protection
barriers from potential hazardous internal areas. No attempt should be made to
troubleshoot internal components with these protective barriers removed
without first disconnecting the equipment from main power.
Rack Mounting This equipment is for use only in complete equipment where the acceptability of
the combination is determined by the applicable safety agency in the country in
which it is installed. This includes UL in the U.S.A., CSA in Canada, and TUV in
Europe.
CAUTION: Do not block the ventilation openings on the top and bottom of the
unit during installation. A minimum of 1 rack unit (1.75”) space is required.
Rack configurations with certain combinations of 3Com equipment installed in
racks with a height greater than 50” (127 cm) may require a counter-balance
weight, a stabilizer bar, or anti-tip legs to ensure rack stability in accordance
with safety agency regulations.
CAUTION: When attaching the rack-mount ears, you must use the
factory-supplied screws. Using screws other than those supplied with the
rack-mount ears voids your warranty and could damage the PCB.

x C
HAPTER
: W
ARNING
I
NFORMATION
Power and Power
Cords
This equipment is not intended for use with IT power distribution systems
whose line to line voltage exceeds 250 VAC RMS defined by EN 60950 as
having no direct connection to earth. The PathBuilder S330/S310 will
auto-configure for 115 VAC or 220-240 VAC.
NORTH AMERICAN APPLICATIONS: Use a UL Listed and CSA Certified Cord Set
rated 6 amps, consisting of a minimum 18 AWG, Type SVT or SJT three
conductor cord maximum of 15 feet in length, with a NEMA 5-15P plug.
INTERNATIONAL APPLICATIONS: The power supply cords used with this
equipment should be harmonized with all local standards applicable in the
country in which it is installed.
Safety agency compliance requires this unit to be connected to branch circuits
with overcurrent protection
£ 20A for North American applications and £ 10A
for international applications.
The power supply cord must be disconnected when servicing all components or
subsystems.
EMI FCC - This equipment generates, uses, and can radiate radio frequency energy,
and if not installed and used in accordance with the instruction manual, may
cause interference to radio communications. It has been tested and found to
comply with the limits for a Class A computing device pursuant with Part 15 of
the FCC Rules, which are designed to provide reasonable protection against
such interference when operated in a commercial environment. Operation of
this equipment in a residential area is likely to cause interference, in which case
the user at his own expense will be required to take whatever measures may be
required to correct the interference. These tests were conducted with shielded
communications cables with metal connector hoods; the use of unshielded
cables may void this compliance.
Canada - This digital apparatus does not exceed the Class A limits for radio
noise emissions from digital apparatus set out in the Radio Interference
Regulations of the Canadian Department of Communications.
Europe - This is a Class A product. In a domestic environment this product may
cause radio interference, in which case, the user may be required to take
adequate measures.
Safety Classification
of Ports for
Connection to
Telecommunications
Networks
The following port types in the product range are classified according to the
Harmonized Europeans Standard EN41003, subclause 4.1.3, as follows:
E1/E3 - TNV normally operating within SELV limits (TNV-1)
1
Telecommunications Network Voltage (EN60950, subclause 1.2.8.8)
2
Safety Extra-Low Voltage (EN60950, subclause 1.2.8.5)

S UPPLEMENTARY R EGULATORY
I
NFORMATION
This section describes the compliance of the SuperStack
®
II PathBuilder
®
S330
and the SuperStack
®
II PathBuilder
®
S310 WAN access switches (PathBuilder
S330/S310) with FCC, Industry Canada, and CE regulations.
FCC Part 68 Statement This equipment complies with Part 68 of the Federal Communications
Commission (FCC) rules. On the product is a label that contains the FCC
registration number for this device. If requested, you must provide this
information to the telephone company.
This equipment is designed to be connected to the telephone network or
premises wiring using a compatible modular jack which is Part 68 compliant.
See installation instructions for details.
If this device causes harm to the telephone network, the telephone company
will notify you in advance that temporary discontinuance of service may be
required. The telephone company may request that you disconnect the
equipment until the problem is resolved.
The telephone company may make changes in its facilities, equipment,
operations, or procedures that could affect the operation of this equipment. If
this happens, the telephone company will provide advance notice in order for
you to make necessary modifications to maintain uninterrupted service.
If you experience trouble with this equipment or for repair or warranty
information, please follow the applicable procedures explained in the Technical
Support section of this manual (Appendix A).
Canadian CS-03
Approval Information The Industry Canada label identifies certified equipment. This certification means
that the equipment meets certain telecommunications network protective,
operational, and safety requirements. Industry Canada does not guarantee the
equipment will operate to your satisfaction.
Before installing this equipment, you should ensure that it is permissible to be
connected to the facilities of the local telecommunications company. You must
also install the equipment using an acceptable method of connection. In some
cases, the inside wiring associated with a single line individual service may be
extended by means of a certified connector assembly. You should be aware that
compliance with the above conditions may not prevent degradation of service in
some situations.

xii CHAPTER : SUPPLEMENTARY REGULATORY INFORMATION
Repairs to certified equipment should be made by an authorized Canadian
maintenance facility designated by the supplier. Any repairs or alterations you
make to this equipment, or equipment malfunctions, may give the
telecommunications company cause to request that you disconnect the
equipment.
CE Notice Marking by the symbol CE indicates compliance of the equipment with the
EMC, Telecom and Low Voltage dIrectives of the European Community. Such
marking is indicative that this equipment meets or exceeds the following
technical standards.
EN55022 - Limits and methods of measurement of radio interference
characteristics of information technology equipment.
EN50082-1 - Electromagnetic compatibility - generic immunity standard part 1:
residential, commercial, and light industrial.
CTR 12 - Connection of 2 Mbit/s Unstructured Leased Lines.
CTR13 - Connection to 2 Mbit/s Structured Leased Lines.
EN 60950 - Safety of Information Technology Equipment including Electrical
Business Equipment.
EN 41003 - Particular safety requirements for electrical equipment to be
connected to Telecom networks.
WARNING: This customer equipment is to be installed and maintained by
service personnel as defined by AS/NZS 3260 clause 1.2.14.3. (service
Personnel). Incorrect connection of connected equipment to the General
Purpose Outlet could result in a hazardous situation.
WARNING: Safety requirements are not fulfilled unless the equipment is
connected to a wall socket outlet with protective earth contact.

ABOUT THIS GUIDE
About This Guide provides an overview of this guide, tells you where to look for
specific information, and describes guide conventions.
Introduction This guide describes how to install and configure the SuperStack®II PathBuilder®
S330 and SuperStack®II PathBuilder® S310 WAN access switches (PathBuilder
S330/S310). It is intended for network administrators, system engineers, field
engineers, and other personnel responsible for installing, configuring, and
managing PathBuilder products.
If the information in the Release Notes shipped with your product differs from the
information in this guide, follow the Release Notes.
Most user guides and release notes are available in Adobe Acrobat Reader
Portable Document Format (PDF) or HTML on the 3Com World Wide Web site:
http://www.3com.com/
How to Use This Guide Table 1 shows where to find specific information in this guide.
Table 1 Where to Find Specific Information
If you are looking for... Turn to...
Descriptions of the features and benefits of the PathBuilder S330/S310 Chapter 1
System specifications Chapter 1
Lists of PathBuilder S330/S310 parts and options available for purchase Chapter 1
Installation instructions Chapter 2
Information on how to get started using the PathBuilder S330/S310 Chapter 3
Instructions for using the PathBuilder S330/S310 menus Chapter 3
Instructions for configuring PathBuilder S330/S310 modules and ports Chapter 4
Instructions for building virtual circuits Chapter 4
Instructions for setting up video conference sessions Chapter 4
Instructions for configuring the Voice Compression module Chapter 4
Instructions for viewing and clearing alarms Chapter 5
Lists of supported alarms Chapter 5
Information about setting loopbacks and the types of loopbacks available Chapter 5
Instructions for viewing performance statistics and information about the
types of statistics available Chapter 5
Technical support information Appendix A
Reference information about the specific interfaces and applications you
can use with the PathBuilder S330/S310 Appendix B

2ABOUT THIS GUIDE
Conventions Table 2 and Table 3 list conventions that are used throughout this guide.
Related
Documentation In addition to this guide, the following documentation may help you use the
PathBuilder S330/S310:
PathBuilder S330/S310 Release Notes—Provides configuration help and
information about new features and any known limitations and issues found in
the release.
PathBuilder Switch Manager User Guide—Describes how to use PathBuilder
Switch Manager to configure and manage PathBuilder WAN switches. Using
PathBuilder Switch Manager, you can configure shelf, device, and circuit
information; use a loopback panel to diagnose port cards; view line and interface
statistics; and perform administrative functions such as configuring trap
destinations and setting SNMP community strings.
Table 2 Notice Icons
Icon Notice Type Description
Information note Information that describes important features or
instructions
Caution Information that alerts you to potential loss of data or
potential damage to an application, system, or device
Warning Information that alerts you to potential personal injury
Table 3 Text Conventions
Convention Description
Screen displays This typeface represents information as it appears on the screen.
The words “enter”
and “type” When you see the word “enter” in this guide, you must type something, and then press the Return or Enter key. Do not press the
Return or Enter key when an instruction simply says “type.”
[Key] names Key names appear in text in one of two ways:
nReferred to by their labels, such as “the Return key” or “the Escape
key”
nWritten with brackets, such as [Return] or [Esc].
If you must press two or more keys simultaneously, the key names are
linked with a plus sign (+). Example:
Press [Ctrl]+[Alt]+[Del].
Menu commands
and buttons Menu commands or button names appear in italics. Example:
From the Help menu, select Contents.
Words in italicized
type Italics emphasize a point or denote new terms at the place where they are defined in the text.
Words in bold-face
type Bold text denotes key features.

1SYSTEM DESCRIPTION
This chapter describes the SuperStack®II PathBuilder®S330 and SuperStack®II
PathBuilder® S310 WAN access switches (PathBuilder S330/S310), and lists
PathBuilder S330 and PathBuilder S310 system specifications. It includes the
following sections:
nPathBuilder S330/S310 Overview
nSpecifications
nOptions and Parts List
PathBuilder S330/S310
Overview The PathBuilder S330 WAN access switch provides cost-effective T1/nxT1 or
E1/nxE1 connections between local campus and enterprise networks via private
leased line or public carrier ATM services so you can extend high-speed Internet
access, Frame Relay, and ATM network service, as well as voice and video, out to
your branch offices. Using the built-in ATM Forum standard-based inverse
multiplexing capabilities, you can integrate voice, video, and high-speed data
services over the same WAN link.
The PathBuilder S330 and PathBuilder S310 use basically the same hardware, with
the PathBuilder S330 providing more interfaces. The following subsections
describe the features of each unit in greater detail.
PathBuilder S330
Features
The PathBuilder S330 base platform offers the following features:
nT1/nxT1 ATM UNI or E1/nxE1 ATM UNI with up to four interfaces for
aggregated high-speed of 6Mbps WAN access. Each user-to-network interface
(UNI) can be used alone or bundled into a group using the Inverse Multiplexing
for ATM (IMA) standard, accommodating branch office growth from a single
T1/E1 (1.5/2 Mbps) bandwidth to four T1s/E1s (6/8 Mbps).
The PathBuilder S330 allows up to 70 msec of differential delay between
T1s/E1s in a single IMA bundle. The unit also supports an automatic
mechanism for removing failed lines from an IMA bundle, ensuring the
resiliency required for your mission-critical applications.
nMultiple connections to Ethernet segments over ATM WAN and support of
bridging, including learning, aging, filtering, and Spanning Tree, through the
Ethernet module.
nSupport of Frame Relay (service and network) interworking, ATM DXI, and
SDLC/HDLC pass-through, through the high-performance serial frame data
interface.

4CHAPTER 1: SYSTEM DESCRIPTION
nChoice of either single-mode or multi-mode OC3/STM-1 (separate units),
through the OC3/STM-1 module. Single-mode enables higher-speed trunking if
you have access to fiber WAN, while multi-mode is ideal for connecting
high-speed servers, switches, or hubs equipped with multi-mode fiber
connections.
nThree expansion slots, allowing you to add other advanced features, such as
T1-DSX or E1 CBR for voice and video, voice compression, or DS3/E3.
n4x switch switching architecture, including four priority queues (three queues
shaped and one bulk shaper) with user-defined queue sizes and early and
partial packet discard capability.
nDevice management via VT100 menu-driven interface, Telnet, or SNMP, with
local, remote, and in-band access.
The following optional modules are available for use with the PathBuilder S330:
nThe four-port CBR module services traffic generated by your existing PBXs,
channels, T1/E1 multiplexers, CSU/DSUs, and video conferencing devices. The
CBR module consists of one V.35/RS-449 and three T1-DSX or E1 interfaces,
which support both structured and unstructured services, in accordance with
the ATM Forum’s Circuit Emulation Service (CES) specifications. The CBR
module provides a smooth migration from legacy CBR service (PBX/voice/video)
to ATM service. It also supports all relevant ATM and T1/E1 standards, ensuring
easy integration of existing equipment into new ATM networks.
nThe one-port Voice Compression module (VCM) is similar in function to the
CBR module, but it employs compression algorithms that allow more voice calls
to be placed through the same bandwidth. The VCM’s T1-DSX/E1 interface
connects to a PBX trunk, which may use CAS or CCS signaling. Its 24/31 DSO
channels can carry individual voice, fax, modem, or data connections. You can
also bundle multiple DSOs to provide connections for high-rate applications
such as video conference or multiple-link PPP. For CCS, a DSO is used as an
ISDN D-channel for carrying signal messages.
nThe DS3/E3 module provides a DS3 or E3 interface, typically used for
terminating/accessing the public or private ATM WAN services. However,
depending on your local applications, you can also use these modules for
taking local DS3 or E3 ATM traffic across the WAN.
Figure 1 shows the PathBuilder S330 with the optional CBR module installed in
expansion slot 7, Voice Compression module in slot 8, and DS3/E3 UNI module in
slot 9.

PathBuilder S330/S310 Overview 5
Figure 1 PathBuilder S330 WAN Access Switch
PathBuilder S310
Features
The PathBuilder S310 is a feature-restricted version of the PathBuilder S330
providing remote site CPE access. Its physical appearance is the same as that of the
PathBuilder S330 but its software does not enable all the ports. You can upgrade
from the PathBuilder S310 to the PathBuilder S330 (multi-mode fiber model)
simply by purchasing software.
The PathBuilder S310 base platform offers the following features:
nSingle T1/E1 UNI.
nMultiple connections to Ethernet segments over ATM WAN and support of
bridging, including learning, aging, and filtering, through the Ethernet module.
nSupport of Frame Relay (service and network) interworking, ATM DXI, and
SDLC/HDLC pass-through, through the high-performance serial frame data
interface.
nThree expansion slots, allowing you to add other advanced features, such as
T1-DSX or E1 CBR for voice and video, voice compression, or DS3/E3.
LAN
NMS Console
RS-232
Router
PBX PBX
T1-DSX/E1 T1-DSX/E1
OC3/STM-1
nx T1/E1 IMA
10BASE-T
V.35/
RS-449/
RS-530/
X.21
V.35/
RS-449/
RS-530/
X.21
Video/Audio
Codec
RS-366
Network

6CHAPTER 1: SYSTEM DESCRIPTION
The following optional modules are available for use with the PathBuilder S310:
nThe two-port CBR module services traffic generated by your existing PBXs,
channels, T1/E1 multiplexers, CSU/DSUs, and video conferencing devices. The
CBR module consists of one V.35/RS-449 and one T1-DSX or E1 interface,
which support both structured and unstructured services, in accordance with
the ATM Forum’s Circuit Emulation Service (CES) specifications. The CBR
module provides a smooth migration from legacy CBR service (PBX/voice/video)
to ATM service. It also supports all relevant ATM and T1/E1 standards, ensuring
easy integration of existing equipment into new ATM networks.
nThe one-port Voice Compression module (VCM) is similar in function to the CBR
module, but it employs compression algorithms that allow more voice calls to
be placed through the same bandwidth. The VCM’s T1-DSX/E1 interface
connects to a PBX trunk, which may use CAS or CCS signaling. Its 24/31 DSO
channels can carry individual voice, fax, modem, or data connections. You can
also bundle multiple DSOs to provide connections for high-rate applications
such as video conference or multiple-link PPP. For CCS, a DSO is used as an
ISDN D-channel for carrying signal messages.
Figure 2 shows the PathBuilder S310, with the optional CBR module installed in
expansion slot 7 and the Voice Compression module in slot 8.
Figure 2 PathBuilder S310 WAN Access Switch
T1-DSX/E1 T1-DSX/E1
V.35/
RS-449/
RS-530/
X.21
Video/Audio
Codec
RS-366
PBX PBX
LAN
NMS Console
RS-232
Router
T1/E1
10BASE-T
V.35/
RS-449/
RS-530/
X.21

PathBuilder S330/S310 Overview 7
Application Support The PathBuilder S330/S310 supports the following applications:
S330 Only n4 x T1/E1 IMA function on the trunk, up to four trunk groups (individual
T1s/E1s)
nSingle T1/E1 for PathBuilder S310
S330 Only nOC3/STM-1 UNI port interface (multi-mode or single-mode fiber), compliant
with ATM Forum’s UNI 3.1, ANSI T1.105
nEthernet interface and bridge function, bridged RFC 1483 and Spanning Tree
nSerial V.35/RS-449/RS-530/X.21 interface frame module, including DXI
protocol, basic frame relay protocol (DLCI to VP/VC conversion), and
transparent HDLC mode of operation
nStructured and unstructured CBR T1-DSX/E1 and V.35/RS-449/RS-530/X.21
interface
nDynamic bandwidth allocation for structured voice CBR ports—stored signaling
bits are checked and bandwidth is released when an on-hook (idle) condition is
detected
nRS-366-based video dial feature, supporting point-to-point and multi-point
video conferencing
nVoice compression, supporting voice activity detection, fax relay, DTMF relay,
and G.729A, G.726, and G.711 compression algorithms.
S330 Only nDS3/E3 UNI interface
nLocal management via a VT100 terminal (or a PC emulating one) connected
directly to the PathBuilder S330/S310, or through a Telnet session.
nSoftware downloading via TFTP, FTP, or direct via RS232
nBuilt-in, menu-driven software for configuring modules, ports, virtual circuits,
and bridges; setting loopbacks; and collecting and displaying alarms.
Key Benefits The PathBuilder S330/S310 provides the following key benefits:
nComplete integration into existing application environments by supporting
legacy data, video, and voice applications, thereby avoiding costly forklift
upgrades.
nVideo dial feature supports point-to-point and multi-point dialed video
conferencing over ATM networks, including:
nRS-366 video dial
nStatic call routing for all destinations
nIdeal for video equipment such as H320
nDynamic bandwidth allocation at both the V.35/RS-366 port and the
T1-DSX/E1 port on the CBR module
nVideo session dialed through SNMP interface via Telnet and RS232
nSimulation of a switched ISDN network over an ATM network
S330 Only nStandards-based IMA implementation; the PathBuilder S330 offers T1/nxT1
and E1/nxE1 ATM access with up to four T1/E1 connections, allowing you to
scale up WAN bandwidth as your traffic increases. Each user-to-network
interface (UNI) can be used alone or bundled into a group, providing up to 6/8
Mbps aggregated WAN access speed.

8CHAPTER 1: SYSTEM DESCRIPTION
nEasily upgradable; no additional hardware required to move from the
PathBuilder S310 to the PathBuilder S330; update your system simply by
purchasing a software upgrade.
nA sophisticated traffic management system allows management of a mix of
applications simultaneously, with features such as deep buffers, traffic shaping,
QoS (Quality of Service), and early packet discard, to give you the most
effective wide-area ATM bandwidth use and ensure applications integrity.
nEmbedded management includes a full IP stack (Telnet, TFTP, and SNMP) and
flash memory for sophisticated yet simple network management.
nComprehensive feature support, including resiliency of nxT1/E1 IMA (S330
only) and redundant power for protection against power failure, ensures
maximum application and network uptime.
n3Com SuperStack II compliance provides common look and feel hardware and
integrated network management solutions.
n3Com SuperStack II Redundant Power Supply (RPS).
Specifications Table 4 lists complete specifications for the PathBuilder S330 WAN access switch.
Table 5 lists complete specifications for the PathBuilder S310 WAN access switch.
Specifications are subject to change without notice.
Table 4 PathBuilder S330 System Specifications
SYSTEM SPECIFICATIONS
Ethernet 10 Base T 1
V.35/RS422 1
OC3/STM-1 1 (single-mode or multi-mode)
T1/E1 UNI 4
Mechanical:
Shelf dimensions
19” rack mountable
Rack mount spacing
Cooling
Unit weight (approx.)
Shipping weight (approx.)
3.5” x 17” x 15.25” (H x W D)
Yes (with brackets)
2 RMS
2 fans @ 37 CRM each (deregulated 20%)
15 lbs. per shelf
20 lbs. per shelf
Input power requirements 90-264 VAC, 50-60 Hz (110/220 self sensing),
standard grounded outlet or -42 to -60 VDC
Power consumption 60 watts typical, 90 watts max
Maximum current 1.5A @110VAC
0.75A @ 220VAC
3A @ 48VDC
Environmental:
Operating temperature
Storage temperature
Humidity
Altitude
0°to 45° C
-40° to 70°C
95% @ +40°C (non-condensing)
14000 ft.
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