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Specifications of Signalling System R2 Study Group XI [Superseded: ITU-T Q.411 ITU-T Q.412 ITU-T Q.414 ITU-T Q.415 ITU-T Q.416 ITU-T Q.421 ITU-T Q.422 ITU-T Q.424 ITU-T Q.430 ITU-T Q.440 ITU-T Q.441 ITU-T Q.442 ITU-T Q.450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.
- Standard No.
- ITU-T Q.400-Q.490-1988
- Release Date
- 1988
- Published By
- International Telecommunication Union (ITU)
- Latest
- ITU-T Q.400-Q.490-1988
- Scope
- Signalling System R2 is used as an international signalling system within international regions (world numbering zones). Moreover, System R2 can be used for integrated international/national signalling if it is employed, in conformity with the present specifications, as a signalling system in the national networks of the region concerned. Suitable for both automatic and semi-automatic working it offers a high reliability in transmission of the information necessary for setting up a call. It allows for rapid call set-up and provides sufficient signals in both directions to permit the transmission of numerical and other information relating to the called and calling subscribers' lines and to increase routing facilities.
ITU-T Q.400-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- 1988 ITU-T Q.400-Q.490-1988 Specifications of Signalling System R2 Study Group XI [Superseded: ITU-T Q.411 ITU-T Q.412 ITU-T Q.414 ITU-T Q.415 ITU-T Q.416 ITU-T Q.421 ITU-T Q.422 ITU-T Q.424 ITU-T Q.430 ITU-T Q.440 ITU-T Q.441 ITU-T Q.442 ITU-T Q.450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.
