Avaya Configuring ATM Services Bedienungsanleitung Seite 27

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Chapter 1
ATM Overview
Asynchronous Transfer Mode (ATM) is a connection-oriented, cell-based
technology that relays traffic across a Broadband Integrated Services Digital
Network (B-ISDN). It is a cost-effective way of transmitting voice, video, and
data across a network.
ATM Cell
An ATM cell is a short, fixed-length packet of 53 bytes. It consists of a 5-byte
header containing address information and a fixed, 48-byte information field.
Figure 1-1 shows a diagram of an ATM cell.
Figure 1-1. ATM Cell
Using a fixed-length cell size allows you to predict network delays, making ATM
suitable for carrying real-time information (for example, voice and video) as well
as data.
ATM allows the network to operate at a much higher rate than typical packet-
switching systems (for example, X.25), because it provides no error protection or
flow control. Instead, ATM relies on the source and destination devices to perform
error-recovery functions such as retransmission of lost packets.
48-Byte
Information Field
5-Byte
Header
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