ITU-T U.4-1989
Exchange of Information Regarding Signals Destined to Be Used over International Circuits Concerned with Switched Teleprinter Networks - Telegraph Switching (Study Group IX) 1 pp

Standard No.

ITU-T U.4-1989

Release Date

1989

Published By

International Telecommunication Union (ITU)

Status

Withdraw

Latest

ITU-T U.4-1989

Scope

that certain signals and certain characteristics of signals u been standardized in Recommendation U.l

ITU-T U.4-1989 history

• 1989 ITU-T U.4-1989 Exchange of Information Regarding Signals Destined to Be Used over International Circuits Concerned with Switched Teleprinter Networks - Telegraph Switching (Study Group IX) 1 pp