Avaya M-ACCF/SF manual ATM is Connection-Oriented, Communication Channels

Chapter 1 Overview

Cells are de-multiplexedat the other end of the connection and forwarded to the correct service destination.

Multi-service processing promotes scalability by significantly reducing the number of changes needed to add new service traffic types to your network.

ATM is Connection-Oriented

ATM is a connection-orientedtransport service that requires a communication channel to be set up between the ATM source and destination end-systems before ATM cells can pass between them.

Note: Before a direct data connection can be set up between two end-systems, a number of control connections are set up. These control connections are beyond the scope of this guide. If you require further information about control connections, refer to the ATM Forum’s “LAN Emulation Over ATM” document.

Figure 1.10 shows the logical structure of a communication channel.

Figure 1.10 Communication Channels

Several communication channels can operate over the same physical link. Each Virtual Path Connection (VPC) contains several communication channels known as Virtual Channel Connections (VCCs).

Note: The ATM access module only manages Virtual Channel Connections (VCC).

AVCC is defined as spanning end-to-end, whereas a Virtual Channel (VC) is the name given to a section of the VCC, refer to Figure 1.11.

18 Avaya M770 M-ACCF/SF ATM Access Modules User’s Guide