cell with a given connection, and therefore it can be routed to the right destination. Identical VPI/VCI combinations may exist on different interfaces.
The VPI is a bundle of VCs. Individual VCs have unique VCI values, but the
VCI values may be reused in each VP.
Figure C-1 Virtual Path/Channels Connections
Two levels of virtual channels are supported at the UNI:
■A Virtual Channel Connection (VCC) that consists of a single connection established between two ATM
■A Virtual Path Connection (VPC) that consists of a bundle of VCCs carried transparently between two ATM
Connections can be established via management (Permanent Virtual
Channels) or dynamically (Switched Virtual Channels).
Permanent Virtual Channels (PVCs) This most basic connection setup requires the definition of each connection by management (for
