ITU-T F.21-1988
Composition of Answer-Back Codes for the International Gentex Service - Telegraph and Mobile Services Operations and Quality of Service Study Group I; 3 pp

Standard No.

ITU-T F.21-1988

Release Date

1988

Published By

International Telecommunication Union (ITU)

Status

Withdraw

Replace By

ITU-T F.21-1993

Latest

ITU-T F.21-1993

Scope

hat the answer-back code sent by teleprinter equipment in the gentex service should provide as much useful information as possible for the operational services. Procedures for checking answer-back codes should be simple and speedy because the average tim

ITU-T F.21-1988 history

• 1993 ITU-T F.21-1993 COMPOSITION OF ANSWER - BACK CODES FOR THE INTERNATIONAL GENTEX SERVICE
• 1988 ITU-T F.21-1988 Composition of Answer-Back Codes for the International Gentex Service - Telegraph and Mobile Services Operations and Quality of Service Study Group I; 3 pp