ATM Configuration and Management Manual

ATM Configuration and Management Manual—522307-003
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Overview of the ATM Subsystem
The ATM subsystem provides access to ATM networks from a NonStop S-series
server. The ATM subsystem supports the ATM User-Network Interface (UNI)
specification over a 155Mbps OC-3 Synchronous Optical Network (SONET)
connection.
The Asynchronous Transfer Mode (ATM)
Protocol
The ATM protocol is a packet-switched, broadband network architecture that uses a
cell-relay mechanism for transmitting data, voice, and video information. ATM is
organized into layers and planes.
The layers define the services related to cell creation, channels and paths, and
protocol translation between other communications services.