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Prestige 642R Series ADSL Router

H Virtual Path and Channels

Appendix B

Virtual Paths and Channels

VPI & VCI

ATM is a connection-oriented technology, meaning that it sets up virtual circuits over which end systems

communicate. The terminology for virtual circuits is as follows:

z VC (virtual channel) Logical connections between end stations

z VP (virtual path) A bundle of VCs

Think of a VP as a cable that contains a bundle of wires. The cable connects two points, and wires within

the cable provide individual circuits between the two points. In an ATM cell header, a VPI (Virtual Path

Identifier) identifies a link formed by a virtual path and a VCI (Virtual Channel Identifier) identifies a

channel within a virtual path. The VPI and VCI are identified and correspond to termination points at ATM

switches as shown. Your telephone company should supply you with these numbers.

Diagram 3 VPI's & VCI's

1 2 ... 153 154 155 156 157 158 159 160 161 162 163

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