Frame Relay        

• ANSI T1.617-1991, Annex D, Additional procedures for permanent virtual connections (PVCs) using unnumbered information frames
• FRF.12, Frame Relay Fragmentation Implementation Agreement
• 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)
• Frame Relay Encapsulation over Pseudo-Wires, Internet Draft draft-martini-frame-encap-mpls-01.txt (except Translation of the command/response bit and sequence numbers and padding.