ITU-T Q.457-1989
Interregister Signalling - Range of Interregister Signalling - Specifications of Signalling Systems R1 and R2 (Study Group XI) 4 pp

Standard No.

ITU-T Q.457-1989

Release Date

1989

Published By

International Telecommunication Union (ITU)

Status

Withdraw

Latest

ITU-T Q.457-1989

Scope

The formula has been determined as shown in Annex C to Section 4.

ITU-T Q.457-1989 history

• 1989 ITU-T Q.457-1989 Interregister Signalling - Range of Interregister Signalling - Specifications of Signalling Systems R1 and R2 (Study Group XI) 4 pp