ITU-T X.21-1992
Interface between Data Terminal Equipment and Data Circuit- Terminating Equipment for Synchronous Operation on Public Data Networks (Study Group VII) 58 pp

Standard No.

ITU-T X.21-1992

Release Date

1992

Published By

International Telecommunication Union (ITU)

Latest

ITU-T X.21-1992

Scope

This Recommendation defines the physical characteristics and call control procedures for a general purpose interface between DTE and DCE for user classes of service, as defined in Recommendation X.l, employing synchronous transmission.

ITU-T X.21-1992 history

• 1992 ITU-T X.21-1992 Interface between Data Terminal Equipment and Data Circuit- Terminating Equipment for Synchronous Operation on Public Data Networks (Study Group VII) 58 pp