ITU-T Q.400 Definitions and Functions of Signals - Forward Line Signals. Backward Line Signals. Forward Register Signals. Backward Register Signals - Specifications of Signalling Systems R1 and R2 (Study Group XI) 4 pp

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ITU-T Q.400 Document Information:

Title
Definitions and Functions of Signals - Forward Line Signals. Backward Line Signals. Forward Register Signals. Backward Register Signals - Specifications of Signalling Systems R1 and R2 (Study Group XI) 4 pp

International Telecommunication Union/ITU Telcommunication Sector

Publication Date:
Nov 1, 1988

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