Avaya Configuring ATM Services Manual do Utilizador Página 103

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114056 Rev. A 7-1
Chapter 7
Customizing PVCs
Setting a VPI/VCI Pair
A virtual path is a set of virtual channels between a common source and
destination. The virtual channels within a virtual path logically associate to a
common identifier. This identifier is called the virtual path identifier (VPI) and is
part of the cell header.
A virtual channel is a logical connection between two communicating ATM
entities. Each virtual channel may carry a different protocol or traffic type. The
virtual channel transports cells that have a common identifier. The identifier is
called the virtual channel identifier (VCI) and is part of the cell header.
Setting a VPI Number
The VPI number does not have a default setting. You must enter a valid VPI
number for each PVC you create. This number identifies the virtual path of the
PVC. The VPI is part of the cell header. The header can contain a maximum of
8 VPI bits for a UNI connection. This bit range allows for path identifiers from 0
through 255.
Note: ATM does not allow duplicate VPI/VCI pairs on the same physical
interface (that is, on the same link module). However, duplicate VPI/VCI pairs
can exist on different physical interfaces (that is, on different link modules).
Site Manager: VPI Number: page A-25
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