ITU-T - Q.121
Signal Code - Specifications of Signalling Systems Nos. 4 and 5 (Study Group XI) 6 pp
inactive, Most Current
| Organization: | ITU-T |
| Publication Date: | 1 January 1989 |
| Status: | inactive |
| Page Count: | 6 |
Document History
Q.121
January 1, 1989
Signal Code - Specifications of Signalling Systems Nos. 4 and 5 (Study Group XI) 6 pp
A description is not available for this item.