2nd International Symposium on Subscriber Loops and Services, 3-7 May 1976
Signals representing the four call status conditions are transmitted from the central equipment to line as a 3-bit code by ... These signals are detected at the central equipment by the amplifier AMP l. ... is generated at the exchange line unit and this INTERCOM MANDSET - BUTTONS aamp; t-GROUP SELECT NAMEPLATE aZ \.
| Title | : | 2nd International Symposium on Subscriber Loops and Services, 3-7 May 1976 |
| Author | : | |
| Publisher | : | - 1976-01-01 |
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