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virtual path (VP)

The ATM layer provides the ability to transmit over virtual paths (VP), each of which can include many virtual channels

.

Relationship between physical layer, VP and VC

Relationship between physical layer, VP and VC

Each ATM cell contains an identifier field in its header

thatincludes a virtual path identifier (VPI) and virtual channel identifier (VCI). This identification

isused to associate each cell

with asingle connection

.A virtual path is formed at a specific reference point from a group of virtual channels (VC) that contain the same path identification. Such a reference point could be an ATM switching unit

.

VPs and VCs in the switching node

VPs and VCs in the switching node

Between two reference points of a virtual path, only VPIs are processed by the ATM network nodes; the VCIs remain unprocessed. At the physical layer, each multiplex layer can support multiple virtual paths. Furthermore, each transmission medium can in turn contain several physical layers.

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Englisch: virtual path - VP
Updated at: 05.08.2003
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