Prestige 642R Series ADSL Router
Appendix B
Virtual Paths and Channels
VPI & VCI
ATM is a
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
H | Virtual Path and Channels |