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| interexchange signalling system | |||
| signalling system (ITU-T (CCITT) Rec. Q.700 ff, FTZ RL 1TR6) | |||
| signalling system; common channel signaling system | |||
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Zeichengabesystem : 9 phrases in 5 subjects |
| Communications | 4 |
| Electronics | 2 |
| General | 1 |
| Information technology | 1 |
| Telecommunications | 1 |