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US7070447-001, Rev 01
11-
1
Chapter 11
Basic ATM Concepts
Asynchronous Transfer Mode (ATM) is a connection-oriented protocol using 53
byte fixed length cells. One significant advantage of ATM is the ability to carry
voice, video and data traffic simultaneously over a 155 megabit per second pipe.
The Hitachi HiSpeed switch is an ATM edge device and provides Ethernet to
ATM connections over an ATM network.
Within the physical link, each Virtual Channel Connection (VCC) is uniquely
identified by VPI/VCI (Virtual Path Identifier/Virtual Channel Identifier) pairs.
The VPI/VCI identifiers allows the network to associate each cell with a virtual
path and channel to switch data through. Each VPI/VCI pair has local
significance only allowing identical VPI/VCI combinations to exist on different
interfaces within the network.
Figure 11-1. VPI/VCI