Virtual Channel (VC): A generic term used to describe unidirectional transport of ATM cells associated by a common unique identifier value.

Virtual Channel Link: A means of unidirectional transport of ATM cells between a point where a VCI value is assigned and the point where that value is translated or terminated.

Virtual Channel Identifier (VCI): A unique numerical tag that identifies a particular VC link for a given VPC.

Virtual Channel Connection (VCC): A concatenation of VC links that extends between two points where ATM service users access the ATM layer. VCCs are provided for the purpose of user-user, user-network, or network-network information transfer. Cell sequence integrity is preserved for cells belonging to the same VCC.

Virtual Path: A generic term used to describe unidirectional transport of ATM cells belonging to virtual channels that are associated by a common unique identifier value.

Virtual Path Link: A group of VC links, identified by a common value of VPI, between a point where a VPI value is assigned and the point where that value is translated or terminated.

Virtual Path Identifier (VPI): Identifies a particular VP link.

Virtual Path Connection (VPC): A concatenation of VP links that extends between the point where the VCI values are assigned and the point where those values are translated or removed, i.e., extending the length of a bundle of VC links that share the same VPI. VPCs are provided for the purpose of user-user, user-network, or network-network information transfer.