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ATM Switching
EndĆtoĆend ATM
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5 Networking - ATM
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3EC 36228 AAAA TCZZA Ed. 01
5.1 The ATM Packet Switching Technology
ATM is a connectionĆoriented packet switching technology using
fixedĆsize packets, called cells.
These cells consist of a header and a payload and are switched
through a public or private ATM network depending on the
contents of the header.
EndĆtoĆend connections are formed by crossĆconnecting individual
ATM segments in ATM switches.
Each ATM cell carries two labels called Virtual Path Identifier (VPI)
and Virtual Channel Identifier (VCI) as part of its header.
An ATM channel, commonly referred to as Virtual Channel,
is fully identified by these two labels. Therefore, multiple ATM
channels can reside on your DSL line.
All AST350i ATM connections are static, i.e. of type Permanent
Virtual Channel (PVC).
The following figure provides an overview of the endĆtoĆend
architecture of the ATM connectivity; from your AST350i to remote
access devices.
Corporate Access Point
Internet
ISP Access Point
ATM CrossĆconnect
ATM CrossĆconnect
ADSL Line
Multiple ATM
virtual channels
Ethernet
This channel is not crossĆconnected
Symbolizes a cross connection.
Hence no endĆtoĆend connectivity!
Remote LAN