Principles Digital Communication System & Computer Networks (Charles River Media Computer Engineering)

28.6 FRAME RELAY STANDARDS

American National Standards Institute (ANSI) and International Telecommunications Union Telecommunications Sector (ITU-T) are the two major standardization bodies that developed the Frame Relay standards. The Frame Relay Forum, a nonprofit organization established in 1991 with many equipment vendors as members, also contributed significantly to the standardization activities. The important ITU-T standards for frame relay are:

• Architecture and service description: I.233

• Datalink layer core aspects: I.922 Annex A

• Switched virtual circuit management: Q.933

• Permanent virtual circuit management: Q.933 Annex A

• Congestion management: I.370

Frame Relay standards emerged out of the standardization activities of Integrated Services Digital Network (ISDN). ANSI, ITU-T, and the Frame Relay Forum are the major contributors to these standards.