Frame Relay Basics: Terms And Definitions

• User to Network Interface (UNI)

  • Specifies signaling and management functions between a frame relay network device and the end user’s device

• Network to Network Interface (NNI)

  • Specifies signaling and management functions between two frame relay networks

• Virtual Circuit (VC)

  • The connection between two frame relay ports

• Permanent Virtual Circuit (PVC)

  • A pre-defined VC

• Switched Virtual Circuit (SVC)

  • A VC that is established dynamically

• Data Link Connection Identifier (DLCI)

  • Virtual Circuit Identification Number

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