ITU-T - Q.140
Definition and Function of Signals - Specifications of Signalling Systems Nos. 4 and 5 (Study Group XI) 3 pp
inactive
| Organization: | ITU-T |
| Publication Date: | 1 November 1988 |
| Status: | inactive |
| Page Count: | 3 |
Document History
November 1, 1988
Specifications of Signalling System No. 5
General
System No. 5 is compatible with both TASI1) and non-TASI-equipped circuits and may be applied for automatic and semi-automatic operation and both-way working. It requires four-wire...
Q.140
November 1, 1988
Definition and Function of Signals - Specifications of Signalling Systems Nos. 4 and 5 (Study Group XI) 3 pp
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