ATM Switching
Endtoend ATM
connectivity
5 Networking - ATM
50
/ 104
3EC 17058 AAAA TCZZA Ed. 04
5.1
The ATM Packet Switching Technology
ATM is a connectionoriented packet switching technology using
fixedsize 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.
Endtoend connections are formed by crossconnecting 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
STHome
ATM connections are static, i.e. of type Permanent
Virtual Channel (PVC).
The following figure provides an overview of the endtoend
architecture of the ATM connectivity; from your
STHome
to remote
access devices.
Corporate Access Point
Internet
ISP Access Point
ATM Crossconnect
ATM Crossconnect
ADSL Line
Multiple ATM
virtual channels
Ethernet
ATMForum
This channel is not crossconnected
Symbolizes a cross connection.
Hence no endtoend connectivity!
Remote LAN
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