Cabletron Systems BRIM-A6 manual Permanent and Switched Virtual Channels, ATM Protocol

Page 43

ATM Protocol

B.3.2 PERMANENT AND SWITCHED VIRTUAL CHANNELS

ATM networks use two different types of Virtual Channels – Permanent Virtual Channels (PVCs) or Switched Virtual Channels (SVCs). The difference between PVCs and SVCs exists in the channel set-up.

PVCs are pre-configured by an administration function, and are usually established for long term use. After setting-up this channel, nothing else is required by the network to transfer information between the two established points. This type of virtual channelling is established through a local or remote management interface.

SVCs use a signaling and network switching procedure to set up dynamically. In other words, SVCs establish “on the fly,” as needed for a particular service, are used to transmit on the short term, and then terminated. Each time a specific channel is established, a routing protocol comes into play providing LAN-style operation and management.

B.4 ATM PROTOCOL

Existing PTM transmission technologies (Ethernet, Token Ring, FDDI) adhere to the International Organization for Standardization (ISO) Open System Interconnection (OSI) model. This seven layer model provides a consistent hierarchy of rules for developing system connection standards. In essence, OSI is a framework on which protocols for particular network types are based. It is important to note that the OSI model is different from the ATM model.

A user’s perception of how a network operates is that it provides a direct link to another device. In reality, the information that the user sees is routed through the layers represented in the following models. Each layer modifies the information a user is either sending or receiving, according to the standards or protocol established for each individual layer.

BRIM-A6 User’s Guide

Page B-5

Page 42 Page 44
Image 43
Page 42 Page 44
Contents BRIM-A6 USER’S Guide BRIM-A6 User’s Guide DOC Notice FCC NoticeVcci Notice Cabletron SYSTEMS, INC. Program License Agreement Exclusion of Warranty and Disclaimer of LiabilityCabletron Software Program License United States Government Restricted Rights Declaration of Conformity Contents Viii BRIM-A6 User’s Guide Chapter Introduction Using this ManualFollowing conventions are used throughout this document Document ConventionsBRIM-A6 Overview BRIM-A6 FeaturesEMC BRIM-A6 SpecificationsRelated Manuals EMIGetting Help Unpacking the Brim Chapter InstallationInstalling an Apim Installing ApimsInstalling a Brim in a MIM Installing BrimsRemoving the Brim Coverplate Installing a Brim in a Hub BRIM-A6 User’s Guide Chapter Local Management Keyboard Conventions Function Local Management Keyboard ConventionsATM Connection Tables Screen Using LIM to Create PVCsATM Connection Tables Screen Fields Using ATM Connection Tables Screen Commands ATM Connection Tables Screen CommandsDeleting PVCs from the Connection Tables Screen Adding PVCs to the Connection Tables ScreenBRIM-A6 Setup Screen Using LM to Create PvcsVPI BRIM-A6 Setup Screen FieldsVCI BRIM-A6 Setup Screen Commands Accessing the BRIM-A6 Add/Delete Entry Screen Using BRIM-A6 Setup Screen CommandsBRIM-A6 Add/Delete Entry Screen Fields Adding a PVC BRIM-A6 Add/Delete Entry Screen CommandsModifying a PVC Deleting a PVC BRIM-A6 LEDs ChapterDescribes each of the Apim LEDs Apim LEDsAPIM-11 Specifications Appendix a Apim SpecificationsAPIM-21 Specifications APIM-29 Specifications APIM-22 SpecificationsBNC APIM-67 SpecificationsATM Basics Appendix B ATM OverviewFigure B-1 ATM Cells ATM CellBRIM-A6 User’s Guide B-3 Virtual Channels and Virtual Paths ATM NetworkATM Protocol Permanent and Switched Virtual ChannelsB-6 BRIM-A6 User’s Guide BRIM-A6 User’s Guide B-7 B-8 BRIM-A6 User’s Guide
Top Page Image Contents