ITU-T Q.122-1989
Signal Sender - Specifications of Signalling Systems Nos. 4 and 5 (Study Group XI) 1 pp

Standard No.

ITU-T Q.122-1989

Release Date

1989

Published By

International Telecommunication Union (ITU)

Status

Withdraw

Latest

ITU-T Q.122-1989

Scope

The signalling frequencies shall be 040 f 6 Hz (“x” frequency); and 2400 f 6 Hz (“y” frequency), these frequencies being applied separately or in combination.

ITU-T Q.122-1989 history

• 1989 ITU-T Q.122-1989 Signal Sender - Specifications of Signalling Systems Nos. 4 and 5 (Study Group XI) 1 pp