3Com 3C63400-3AC-C - PathBuilder S700 Switch User manual

http://www.3com.com/
¨
PathBuilder
®
S700
WAN Access Switch Reference Guide
Release 2.03
Part No.3C64917
010-12197-0001
Published November 1998

3Com Corporation
5400 Bayfront Plaza
Santa Clara, California
95052-8145
© 3Com Corporation, 1998. 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.
UNITED STATES GOVERNMENT LEGENDS:
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 Government is subject to restrictions as set
forth in subparagraph (c) (1) (ii) for Restricted Rights in Technical Data and Computer Software Clause at 48
C.F.R. 52.227-7013. 3Com Corporation, 5400 Bayfront Plaza, Santa Clara, California 95052-8145.
For civilian agencies:
Restricted Rights Legend: Use, reproduction, or disclosure is subject to restrictions set forth in subparagraph
(a) through (d) of the Commercial Computer Software - Restricted Rights Clause at 48 C.F.R. 52.227-19 and
the limitations set forth in 3Com Corporation’s standard commercial agreement for the software.
Unpublished rights reserved under the copyright laws of the United States.
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. If you are unable to locate a copy, please contact
3Com and a copy will be provided to you.
Unless otherwise indicated, 3Com registered trademarks are registered in the United States and may or may
not be registered in other countries.
3Com and PathBuilder are trademarks of 3Com Corporation.
Other brand and product names may be registered trademarks or trademarks of their respective holders.

C
ONTENTS
W
ARNING
I
NFORMATION
Servicing ix
Rack Mounting ix
Power and Power Cords ix
EMI x
Safety Classification of Ports for Connection to Telecommunications Networks x
S
UPPLEMENTARY
R
EGULATORY
I
NFORMATION
Host Chassis/Module Compatibility and Creepage/Clearance Requirements xi
FCC Part 68 Statement xii
CE Notice xiii
A
BOUT THIS
G
UIDE
Introduction 1
How to Use This Guide 1
Conventions 2
Related Documentation 3
1
S
YSTEM
D
ESCRIPTION
Introducing the PathBuilder S700 5
PathBuilder S700 Features 5
Key Features of the STX Module 5
PathBuilder S700 Architecture 6
Specifications 8
Options and Parts List 12
2 I
NSTALLATION
Receiving and Inspecting the PathBuilder S700 15
Installation Overview 15
Site Requirements 16
Step 1: Install the Shelf in the Rack 16
Step 2: Connect AC or DC Power 17
Step 3: (If needed) Install Additional Modules in the Shelf 21
Step 4: Connect I/O Cabling and Wiring 22
Normal Startup Sequence 23
Connecting a DS3 UNI or E3 UNI Module 23

Connecting an OC3/STM-1 UNI Module 26
Connecting a DS1/E1 UNI with IMA Module 27
Connecting an Ethernet Module 28
Connecting a DSX-1 CBR or E1 CBR Module 30
Connecting a QSIM V.35/RS422/EIA530 Module 33
Connecting a HSIM Module 44
Connecting a DS1 Frame Access Module 46
Verifying CPU LEDs and Connecting the Office Alarm Connector 47
Connecting the Office Alarms 48
Verifying STX LEDs and Connecting the Optional BITS Clock 51
Connecting the Optional BITS Clock (STX) 51
Connecting Rear Redundant Modules 53
Step 5: Connect a Management Terminal 55
3
G
ETTING
S
TARTED
Logging On 57
Using the Menus 59
Navigating through the Menus 59
Understanding the Menu Hierarchy 60
Using the Menus to Change Settings 60
Alarm Indicator 60
Performing Initial Configuration 61
Setting up Communication Parameters 62
Configuring the Local Host IP Address 63
Configuring Trap Clients 66
Configuring the Default Gateway 68
Configuring In-band Management 68
In-band Management via the 10Base-T Port on the Near-end MCPU Card 68
In-band Management via the Near-end Dual Ethernet Module 70
Performing Super User Functions 70
Setting Passwords 71
Taking over a Read-Write Session 72
Erasing the System Database 72
Setting the Time and Date 73
4
P
ATH
B
UILDER
S700 M
ODULE AND
A
PPLICATION
O
VERVIEW
ATM Overview 75
Virtual Circuits 75
System Module Overview 77
Management CPU Module 77
SNMP MIB Standards Support 78
STX Module 78
Priority Queuing 79
ATM Module Overview 79
DS3 UNI Module Overview 80
E3 UNI Module Overview 80

OC3/STM-1 UNI Module Overview 80
DS1/E1 UNI with IMA Module Overview 80
Application Module Overview 80
Ethernet Module Overview 81
Ethernet Module Standards Support 81
Ethernet Module Operation 81
DSX-1/E1 CBR Module Overview 82
DSX-1 CBR Module 82
E1 CBR Module 83
QSIM/HSIM/FAM Module Overview 84
Supported Applications 85
Bridging 85
Filtering 86
Addressing 86
Learning Bridge 86
Segmentation 87
Reassembly 88
Spanning Tree 88
Spanning Tree Operation 89
Spanning Tree Instances 89
CBR Application 90
Structured DS1 90
DS0 Signaling and Dynamic Bandwidth Allocation 92
Unstructured DS1 93
Structured versus Unstructured Summary 95
Ethernet and Voice Application 95
Frame Application 99
DXI Mode 1A 99
Frame Relay Interworking Functions 102
HDLC/SDLC 103
5
C
ONFIGURING
P
ATH
B
UILDER
S700 M
ODULES
, P
ORTS
,
AND
A
PPLICATIONS
Viewing and Configuring System Information 105
Specifying General System Information 106
Managing the System Clock 107
Alarm Conditions that Cause Clock Source Failure 110
Viewing and Configuring RS-232 Parameters 110
Viewing the Firmware Version 111
Downloading New Firmware 112
Downloading Firmware via the Ethernet Port 113
Downloading Firmware via the Serial Port 113
Downloading Firmware via FTP 114
Updating the Flash File System 114
Resetting the Interface Card 115
Viewing an Equipment List 115
Backing up and Restoring the Database and Code Image 116

Backing up the Database 116
Restoring the Database 117
Backing up the Code Image 117
Restoring the Code Image 118
PathBuilder S700 Configuration Overview 118
Configuring the PathBuilder S700 Shelf and the Application Modules 119
Setting Application Module Status 120
Configuring the Shelf 120
Setting Power Supply Status 121
Setting External Alarm Status 121
Configuring the Management CPU 122
Viewing MCPU Configuration Information 122
Configuring Virtual Interfaces 122
Adding Virtual Interfaces 123
Viewing and/or Modifying Existing Virtual Interfaces 125
Deleting Virtual Interfaces 126
Configuring Input Shapers 126
Configuring the STX Module 127
Configuring OC3/STM-1 UNI Modules 128
Configuring DS3 UNI Modules 130
Configuring E3 UNI Modules 133
Configuring DS1 UNI or E1 UNI with IMA Modules 134
Configuring DS1/E1 UNI Ports 135
Activation/Deactivation Bit Error Rates 137
Configuring UNI and IMA Groups 138
Adding UNI Groups 138
Adding IMA Groups 140
Viewing and Modifying IMA and UNI Groups 142
Configuring Virtual Interfaces for IMA Groups 143
Deleting IMA and UNI Groups 143
Viewing IMA Link Status 145
Viewing IMA Group Status 147
Configuring DS1 UNI or E1 UNI Cards 150
Configuring Ethernet Modules 151
Configuring Ethernet Ports, Cards, Shapers and Virtual Interfaces 151
Configuring the Bridge 153
Configuring Source Protocol Filtering 155
Configuring Source Address Filtering 156
Configuring Destination Address Filtering 158
Viewing the List Forwarding Table 159
Constructing the Bridge Static Table 160
Enabling and Disabling the Spanning Tree 161
Configuring IP Over ATM 161
Configuring DSX-1 CBR or E1 CBR Modules 166
Configuring QSIM/HSIM/FAM Modules 172
Configuring QSIM/HSIM/FAM Ports 172
QSIM/HSIM/FAM Performance at Small Frame Sizes 176
Configuring the QSIM/HSIM/FAM Local Management Interface 178

Configuring QSIM/HSIM/FAM Cards 180
Configuring Virtual Circuits 181
Summary of Supported VPI/VCI Ranges and Number of Connections 182
Adding Virtual Circuits 183
Configuring Unicast Virtual Circuits 185
Configuring Multicast Source Virtual Circuits 189
Configuring Multicast Leaf Virtual Circuits 190
Virtual Circuit Parameters 191
Common Virtual Circuit Parameters 192
ATM Module Virtual Circuit Parameters 193
Ethernet Module Virtual Circuit Parameters 193
CBR Module Virtual Circuit Parameters 193
QSIM/HSIM/FAM Virtual Circuit Parameters 195
Viewing Existing Virtual Circuits 199
Viewing Virtual Circuits for the Entire Chassis 199
Viewing Virtual Circuits by Port or Group 201
Modifying Virtual Circuits 203
Deleting Virtual Circuits 204
Viewing Virtual Circuit Statistics 204
6
P
ATH
B
UILDER
S700 D
IAGNOSTICS AND
P
ERFORMANCE
M
ONITORING
Managing System Alarms 205
Viewing and Clearing Current Alarms 205
PathBuilder S700 Alarm Messages 207
MCPU and STX Module (System) Alarms 207
Alarms Common to Several Modules 211
DS1/E1 UNI Module Alarms 213
DSX-1/E1 CBR Module Alarms 218
QSIM/FAM Alarms 219
Working with History Alarms 219
Viewing and Printing History Alarms 219
Clearing History Alarms 220
Using Loopbacks 220
DS3 UNI Module Loopbacks 222
E3 UNI Module Loopbacks 222
OC3/STM-1 UNI Module Loopbacks 223
DSX-1 CBR Module Loopbacks 224
FAM Loopbacks 224
DS1/E1 UNI with IMA Module Loopbacks 225
Viewing Statistics 225
Card Statistics Overview 225
Performance Statistics Overview 225
ATM Statistics Overview 226
Virtual Circuit Statistics Overview 227
Viewing Card Statistics 227
Viewing DS3 UNI Module Statistics 228
Viewing E3 UNI Module Statistics 229

Viewing OC3/STM-1 UNI Module Statistics 230
Viewing DS1 UNI and E1 UNI with IMA Module Statistics 232
Viewing Ethernet Module Statistics 235
Viewing DSX-1 and E1 CBR Module Statistics 237
Viewing QSIM/HSIM/FAM Statistics 238
Viewing Virtual Circuit Statistics 241
Viewing Virtual Circuit Statistics by Circuit 241
Conforming/Non-Conforming Cell Counters 243
Viewing Virtual Circuit Statistics by Port/Group 244
A T
ECHNICAL
S
UPPORT
Online Technical Services 247
World Wide Web Site 247
3Com FTP Site 247
3Com Bulletin Board Service 248
Access by Analog Modem 248
Access by Digital Modem 248
3ComFacts Automated Fax Service 248
Support from Your Network Supplier 248
Support from 3Com 249
Returning Products for Repair 250
I
NDEX
3C
OM
C
ORPORATION
L
IMITED
W
ARRANTY

W ARNING I NFORMATION
This section contains warning information for AC powered systems.
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.
Conditions of Acceptability: When installed in the end-use equipment, the
following are among the considerations to be made.
1 The units shall be installed in compliance with enclosure, mounting, spacing,
casualty, and segregation requirements of the ultimate application.
2 These units have been judged on the basis of the required spacings of UL 1950
D3 deviations edition, CSA 22.2 No. 950-M89, and EN 60950 1988 through
TUV Rheinland, which would cover these components if submitted for
unrestricted listing or certification.
3 Complete testing should be performed in the end-use product.
4 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. See specific rack installation guidelines for 3Com
recommendations.
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 S700 WAN Access Switch
will autoconfigure for 115 VAC or 220-240 VAC.

x C
HAPTER
: W
ARNING
I
NFORMATION
NORTH AMERICAN APPLICATIONS: Use a UL Listed and CSA Certified Cord Set
rated 12 amps, consisting of a minimum 10 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 provides information about host chassis/module compatibility and
creepage/clearance requirements. It also describes the compliance of the
PathBuilder S700 WAN access switch (Pathbuilder S700) with FCC and CE
regulations.
Host Chassis/Module
Compatibility and
Creepage/Clearance
Requirements
The installer of the E1 CBR and E3 UNI Module must ensure that the host
chassis and module are compatible and that the host chassis is capable of
providing adequate power to the module and any other auxiliary host apparatus.
The E1 CBR Module has the following input power requirements:
+5 vdc @ 3.6 Amps
The E3 UNI Module has the following input power requirements:
+5 vdc @ 3.0 Amps
Please contact 3Com for an up-to-date list of compatible host chassis.
In order to maintain the independent approval of this card, it must be installed
in such a way that with the exception of the connections to the host, when
other option cards are introduced which use or generate a hazardous voltage,
the minimum creepages and clearances specified in the table below are
maintained. A hazardous voltage is one which exceeds 42.2V peak AC or 60V
DC.
If you have any doubt, seek advice from a component engineer before installing
other adapters into the test equipment.
The larger distance shown in parentheses in the table above applies where the
local environment within the host is subject to conductive pollution or dry
non-conductive pollution which could become conductive due to condensation.
Failure to maintain these minimum distances would invalidate the approval.
Clearance (mm) Creepage (mm)
Voltage Used or Generated by Host
or Other Cards
2.0 2.4 (3.8) Up to 59 Vrms or Vdc
2.6 3.0 (4.8) Up to 125 Vrms or Vdc
4.0 5.0 (8.0) Up to 250 Vrms or Vdc
4.0 6.4 (10.0) Up to 300 Vrms or Vdc
For a host or other expansion card fitted in the
host, using or generating voltages greater than
300V (rms or dc), advice from a competent
telecommunications safety engineer must be
obtained before installation of this card.
Above 300 Vrms or Vdc

xii CHAPTER : SUPPLEMENTARY REGULATORY INFORMATION
Clearance (distance X in the figure below) is defined as the shortest distance
between two conductive parts, or between the conductive part and the bonding
surface of the equipment, measured through air.
Creepage (distance Y in the figure below) is defined as the shortest path
between two conductive parts, or between the conductive part and the bonding
surface of the equipment, measured along the surface of the insulation.
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).
Interface Module Adjacent Card
Host Chassis
Components
Y
X

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.

xiv CHAPTER : SUPPLEMENTARY REGULATORY INFORMATION

ABOUT THIS GUIDE
About This Guide provides an overview of this guide, describes guide conventions,
tells you where to look for specific information and lists other publications that
may be useful.
Introduction This guide describes how to install and configure the PathBuilder S700 WAN
access switch (PathBuilder S700). It also provides an overview of the unit’s modules
and supported applications.
Audience Description This guide 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.
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 S700 Chapter 1
System specifications Chapter 1
Installation instructions Chapter 2
Information about how to get started using the PathBuilder S700 Chapter 3
Instructions for using the PathBuilder S700 menus Chapter 3
Information about the specific modules and applications you can use with
the PathBuilder S700 Chapter 4
Instructions for configuring PathBuilder S700 modules, ports, and cards Chapter 5
Instructions for configuring virtual interfaces Chapter 5
Instructions for configuring shapers Chapter 5
Instructions for configuring virtual circuits Chapter 5
Instructions for configuring bridging applications Chapter 5
Information about managing system alarms and lists of the alarms
supported by the PathBuilder S700 Chapter 6
Information about setting up loopbacks and what loopbacks specific
modules support Chapter 6
Information about displaying statistics and lists of the types of statistics
available for specific modules Chapter 6
Technical support information Appendix A

2ABOUT THIS GUIDE
Conventions Table 2 and Table 3 list conventions that are used throughout this guide.
Table 2 Notice Icons
Icon Notice Type Alerts you to...
Information note Important features or instructions
Caution Risk of personal injury, system damage, or loss of data
Warning Risk of severe personal injury
Table 3 Text Conventions
Convention Description
Syntax The word “syntax” means you must evaluate the syntax provided and
supply the appropriate values. Placeholders for values you must supply
appear in angle brackets. Example:
Enable RIPIP by using the following syntax:
SETDefault !<port> -RIPIP CONTrol = Listen
In this example, you must supply a port number for <port>.
Commands The word “command” means you must enter the command exactly as
shown in text and press the Return or Enter key. Example:
To remove the IP address, enter the following command:
SETDefault !0 -IP NETaddr = 0.0.0.0
This guide always gives the full form of a command in uppercase and
lowercase letters. However, you can abbreviate commands by entering
only the uppercase letters and the appropriate value. Commands are
not case-sensitive.
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.

Related Documentation 3
Related
Documentation
In addition to this guide, the following documentation may help you use the
PathBuilder S700.
PathBuilder S700 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 access 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.

4ABOUT THIS GUIDE

1SYSTEM DESCRIPTION
This chapter describes the PathBuilder S700 WAN access switch (PathBuilder
S700), and lists PathBuilder S700 system specifications. It includes the following
sections:
nIntroducing the PathBuilder S700
nSpecifications
nOptions and Parts List
Introducing the
PathBuilder S700
The PathBuilder S700 is a next-generation multiservice platform that provides
adaptation, concentration, and switching of a wide variety of traffic onto
high-speed ATM links. Delivering sophisticated data, voice and video adaptation,
and traffic management capabilities, the PathBuilder S700 WAN access switch is
an ideal platform both for service providers (to provision low-speed multiservice
services) and for enterprise users (to build converged networks).
PathBuilder S700
Features
The PathBuilder S700 provides the following key features:
nScalability—18 slots, with 14 slots for application modules, supporting a
maximum of 96 (rear access) or 112 (front access) T1 or E1 ports, 14 DS3 or E3
ports, or 14 OC3/STM-1 ports.
nHigh ATM backplane capacity—3.2 Gbps
nSupports proven technology—queuing, buffering, traffic shaping, traffic
policing, early packet discard, and multicasting. See “Key Features of the STX
Module” below for details.
nResiliency—supports load-sharing power supplies, hot-swappable common
components (MCPU and STX), and application modules; selected rear
redundant application modules are available; common component and
application module redundancy will be supported in subsequent releases.
nLegacy module support—use existing PathBuilder S600 application modules
in the PathBuilder S700.
nRear cable access—rear access modules designed specifically for the
PathBuilder S700; available now for T1/E1 and DS3/E3 application modules.
Key Features of the STX Module
The STX module includes a switching fabric that provides sophisticated traffic
management, priority queuing, and multicasting. Once an application module
SARs its traffic into ATM cells, the STX receives the cells and performs address
lookup for switching, queuing, traffic shaping, traffic policing, early packet
discard, and multicasting.

6CHAPTER 1: SYSTEM DESCRIPTION
The STX module provides the following features:
nAny-to-any port switching
nVirtual interfaces (VIs); logical UNI ports that provide traffic shaping profiles
(127 total VIs allowed: 24 per triple-slot bus (7-9, 10-12, 13-15, 16-18), 15 per
slot for slots 5 and 6, 1 for MCPU)
nDeep buffers for queuing (8,000 cells per VI for a total of over 1 million cells
buffered per shelf)
nPriority queuing in which each VI can be assigned to specific VCs which can be
allocated to one of 4 queues
nPer VC traffic policing
nMulticasting (up to 256 connections with 32 leaves)
nBipolar Timing Source (BITS) timing clock
nPer VC statistics
n4,000 connections per unit
PathBuilder S700
Architecture
The modular architecture of the PathBuilder S700 is designed to accommodate a
wide range of interfaces and support a comprehensive set of applications. The
core component of the unit is a 3.2 Gbps cell bus backplane where all traffic is
carried in the form of ATM cells. The PathBuilder S700 accommodates up to six
power supplies (AC 110/220 VAC and DC-48 VDC) in a load-sharing
configuration.
The overall design philosophy of the PathBuilder S700 is to facilitate the transfer of
cells on and off the bus backplane with enhanced traffic management and
switching capabilities. Figure 1 illustrates the cell bus architecture. All
packet-to-cell segmentation and reassembly (SAR) functions are performed on
each of the application modules (Ethernet, Frame Relay, and CBR), thereby
ensuring efficient cell transfer through the system. Additional SAR power is added
each time a non-ATM interface module is added.
Figure 1 PathBuilder S700 Cell Bus Architecture
Ethernet Frame
Relay CBR ATM
STX MCPU
10BaseT(2) T1/E1(4/8)
T1/E1(with integral IMA),
DS3/E3, OC3/STM-1V.35(4), HSSI(1), T1(8)
10BaseT,RS232, SLIP