ITU-T Q.490-1988
Testing and Maintenance - Specifications of Signalling Systems R1 and R2 (Study Group XI) 5 pp

Standard No.

ITU-T Q.490-1988

Release Date

1988

Published By

International Telecommunication Union (ITU)

Status

Withdraw

Replace By

ITU-T Q.400-Q.490-1988

Latest

ITU-T Q.400-Q.490-1988

Scope

In international working the guiding principles and testing arrangements for maintenance as defined in Recommendations M.700 to M.728 and 4.134 also apply to Signalling System R2. The organization of routine maintenance, tests and measurements of signalli

ITU-T Q.490-1988 history

• 1988 ITU-T Q.400-Q.490-1988 Specifications of Signalling System R2 Study Group XI [Superseded: ITU-T Q.411 ITU-T Q.412 ITU-T Q.414 ITU-T Q.415 ITU-T Q.416 ITU-T Q.421 ITU-T Q.422 ITU-T Q.424 ITU-T Q.430 ITU-T Q.440 ITU-T Q.441 ITU-T Q.442 ITU-T Q.450 ITU-T Q.451 ITU-T Q.452 ITU-T Q.

ITU-T Q.490-1988 Testing and Maintenance - Specifications of Signalling Systems R1 and R2 (Study Group XI) 5 pp was changed to ITU-T Q.400-Q.490-1988 Specifications of Signalling System R2 Study Group XI [Superseded: ITU-T Q.411 ITU-T Q.412 ITU-T Q.414 ITU-T Q.415 ITU-T Q.416 ITU-T Q.421 ITU-T Q.422 ITU-T Q.424 ITU-T Q.430 ITU-T Q.440 ITU-T Q.441 ITU-T Q.442 ITU-T Q.450 ITU-T Q.451 ITU-T Q.452 ITU-T Q..