Frame Relay
- ANSI T1.617-1991, Annex D, Additional procedures for permanent virtual connections (PVCs) using unnumbered information frames
- FRF.15, End-to-End Multilink Frame Relay Implementation Agreement
- FRF.16.1, Multilink Frame Relay UNI/NNI Implementation Agreement
- ITU Q.933a, Annex A, Additional Procedures for Permanent Virtual Connections (PVC) status management (using Unnumbered Information frames)