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B-1

Appendix B

Understanding ATM Concepts

This appendix provides an overview of basic ATM concepts and the specific ways

Nortel Networks implements these concepts on BayRS routers.

ATM General Information

Before you can begin using ATM Half-Bridge services, you must understand

some basic ATM concepts and how ATM works.

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 Cells

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 B-1

shows a diagram of an ATM cell.

Cell Headers

After dividing the data into 48-byte segments for transmission, the end device

(that is, the ATM DSU/CSU or native ATM device) attaches the required header

information (Figure B-1

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Avaya Configuring ATM Half-Bridge Services Bedienungsanleitung Seite 81