ZyXEL P-660RU-T3 v2 User Guide - Page 155
Virtual Circuit Topology
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APPENDIX E 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: • Virtual Channel • Virtual Path • Virtual Circuits Logical connections between ATM switches A bundle of virtual channels A series of virtual paths between circuit end point Figure 98 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. P-660RU-T v2 User's Guide 155