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IES-708-22A User’s Guide

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APPENDIX D

Virtual Circuit Topology

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:

Figure 180 Virtual Circuit Topology

Think of a virtual path 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; a

VCI (Virtual Channel Identifier) identifies a channel within a virtual path.

The VPI and VCI identify a virtual path, that is, termination points between ATM switches. A

series of virtual paths make up a virtual circuit.

• Virtual Channel Logical connections between ATM switches

• Virtual Path A bundle of virtual channels

• Virtual Circuits A series of virtual paths between circuit end point

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