ITU-T Q.142-1989
Double Seizing with Both-Way Operation - Specifications of Signalling Systems Nos. 4 and 5 (Study Group XI) 2 pp

Standard No.

ITU-T Q.142-1989

Release Date

1989

Published By

International Telecommunication Union (ITU)

Status

Withdraw

Latest

ITU-T Q.142-1989

Scope

The noise as measured at the output of the line signal sender shall be as low as practicable but in any event, at least 40 dB below signal level. This noise includes all extraneous power in the frequency band between 300 Hz and 3400 Hz including power res

ITU-T Q.142-1989 history

• 1989 ITU-T Q.142-1989 Double Seizing with Both-Way Operation - Specifications of Signalling Systems Nos. 4 and 5 (Study Group XI) 2 pp