5 Networking - ATM

5.1The ATM Packet Switching Technology

ATM Switching

End￿to￿end ATM connectivity

ATM is a connection￿oriented packet switching technology using fixed￿size 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.

End￿to￿end connections are formed by cross￿connecting 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 end￿to￿end architecture of the ATM connectivity; from your AST350i to remote access devices.

Internet

ISP Access Point

ATM Cross￿connect

 

Multiple ATM virtual channels

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corporate Access Point

ATM Cross￿connect

Ethernet

 

 

 

ADSL Line

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Remote LAN

This channel is not cross￿connected

 

 

Hence no end￿to￿end connectivity!

 

Symbolizes a cross connection.

 

 

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3EC 36228 AAAA TCZZA Ed. 01

 

 

 

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Alcatel Carrier Internetworking Solutions 350I manual ATM Packet Switching Technology, ATM Switching

350I specifications

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