Glossary
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USER-TO-NETWORK INTERFACE (UNI)—The interface between an end device and a
public or private ATM switch.
VIRTUAL CIRCUIT (VC)—A connection between end users that has defined end points
and route but does not have bandwidth dedicated to it. Bandwidth is allocated on demand
by the network as users have traffic to transmit.
VIRTUAL CHANNEL CONNECTION (VCC)—Virtual channels in two or more
sequential physical circuits can be concatenated to create an end-to-end connection called a
VCC. A VCC is a specific instance of a SVC or PVC. A VCC may traverse one end-to-end
VPC or several sequential VPCs.
VIRTUAL CIRCUIT IDENTIFIER (VCI)—Field in an ATM cell that maps the cell’s
route through the ATM network.
VIRTUAL LAN (VLAN)—A user-configured logical workgroup or collection of Ethernet
addresses, as opposed to a physical LAN defined entirely by wiring.
VIRTUAL PATH IDENTIFIER (VPI)—Field in an ATM cell that maps the cell’s route
through the ATM network.
