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Cabletron Systems BRIM-A6 B.3 THE ATM NETWORK, B.3.1 VIRTUAL CHANNELS AND VIRTUAL PATHS

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Appendix B: ATM Overview

Page B-4 BRIM-A6 User’s Guide

B.3 THE ATM NETWORK

ATM is a connection-oriented transmission technology. This means that

no information transfers prior to establishing connection between devices.

When preparing information, ATM uses Virtual Channels and Virtual

Paths as cell addresses and places this channel data into the cell header.

When transferring information, ATM combines these Virtual Channels

and Virtual Paths into bundles, or “pipes” before sending them out over an

ATM physical link segment.

B.3.1 VIRTUAL CHANNELS AND VIRTUAL PATHS

Rather than addressing cells to a speciﬁc destination, as in a LAN, ATM

addresses cells to Virtual Channels (VCs) and/or Virtual P aths (VPs). This

addressing takes place in the header ﬁeld of the ATM cell.

VCs and VPs are bi-directional (i.e., they transfer information in both

directions on a single channel or path) and are “set-up” between devices

on the ATM network prior to transmission. Similar to WAN transmission,

ATM technology provides the ability of sending several VCs together

over a VP, and several VPs over an ATM link segment (Figure B-3).

Figure B-3 Virtual Channels and Virtual Paths

ATM Link Segment

VP 1

VP 2

VC 1

VC 2

VC 3

VC 1

book Page 4 Thursday, April 18, 1996 2:18 PM

Contents

Main BRIM-A6 Users Guide i NOTICE ii BRIM-A6 Users Guide VCCI NOTICE DOC NOTICE FCC NOTICE BRIM-A6 Users Guide iii EXCLUSION OF WARRANTY AND DISCLAIMER OF LIABILITY CABLETRON SOFTWARE PROGRAM LICENSE CABLETRON SYSTEMS, INC. PROGRAM LICENSE AGREEMENT Page BRIM-A6 Users Guide v DECLARATION OF CONFORMITY BRIM-A6 Users Guide vii CONTENTS Contents viii BRIM-A6 Users Guide CHAPTER 1 INTRODUCTION 1.1 USING THIS MANUAL 1.2 DOCUMENT CONVENTIONS 1.3 BRIM-A6 OVERVIEW 1.4 BRIM-A6 FEATURES 1.5 BRIM-A6 SPECIFICATIONS 1.6 RELATED MANUALS 1.7 GETTING HELP CHAPTER 2 INSTALLATION 2.1 UNPACKING THE BRIM 2.2 INSTALLING APIMS 2.3 INSTALLING BRIMS 2.3.1 Installing a BRIM in a MIM Chapter 2: Installation Page 2-4 BRIM-A6 Users Guide Figure 2-2 Removing the BRIM Coverplate Figure 2-3 Installing the BRIM 2.3.2 Installing a BRIM in a Hub Page CHAPTER 3 LOCAL MANAGEMENT Chapter 3: Local Management Page 3-2 BRIM-A6 Users Guide 3.1 LOCAL MANAGEMENT KEYBOARD CONVENTIONS 3.2 USING LIM TO CREATE PVCs 3.2.1 ATM Connection Tables Screen Fields 3.2.2 ATM Connection Tables Screen Commands 3.2.3 Using ATM Connection Tables Screen Commands 3.2.4 Adding PVCs to the Connection Tables Screen 3.2.5 Deleting PVCs from the Connection Tables Screen 3.3 USING LM TO CREATE PVCS 3.3.1 BRIM-A6 Setup Screen Fields 3.3.2 BRIM-A6 Setup Screen Commands 3.3.3 Using BRIM-A6 Setup Screen Commands 3.3.4 Accessing the BRIM-A6 Add/Delete Entry Screen 3.3.5 BRIM-A6 Add/Delete Entry Screen Fields 3.3.6 BRIM-A6 Add/Delete Entry Screen Commands 3.3.7 Adding a PVC 3.3.8 Modifying a PVC 3.3.9 Deleting a PVC BRIM-A6 Users Guide Page 4-1 CHAPTER 4 LANVIEW LEDs 4.1 BRIM-A6 LEDs Table 4-1 describes each of the BRIM-A6 LEDs. BRIM-A6 Chapter 4: LANVIEW LEDs 4.2 APIM LEDs Table 4-2 describes each of the APIM LEDs. APPENDIX A APIM SPECIFICATIONS A.1 APIM-11 SPECIFICATIONS A.2 APIM-21 SPECIFICATIONS A.3 APIM-22 SPECIFICATIONS A.4 APIM-29 SPECIFICATIONS A.5 APIM-67 SPECIFICATIONS APPENDIX B ATM OVERVIEW B.1 ATM BASICS B.2 THE ATM CELL Page B.3 THE ATM NETWORK B.3.1 VIRTUAL CHANNELS AND VIRTUAL PATHS B.3.2 PERMANENT AND SWITCHED VIRTUAL CHANNELS B.4 ATM PROTOCOL