Patent
1981-03-12
1985-01-15
Rubinson, Gene Z.
179 30, H04M 356
Patent
active
044939493
ABSTRACT:
Disclosed is a digital station apparatus, such as a digital telephone set, capable of being operated in parallel on a subscriber's digital loop (e.g. in an extension mode) without the need to route all the PCM signals to common equipment. Only one of the parallel sets is active at a time; all the others are passive. In the passive state the telephone set receives only, and does not transmit. It monitors its own signal magnitude relative to the signal magnitude produced by the active "extension" on the same digital loop. When its own signal magnitude has satisfied a comparison criterion, then that passive set becomes active and both transmits and receives, while all other sets on the loop are passive.
REFERENCES:
patent: 3735359 (1973-05-01), Wagner
patent: 3970797 (1976-07-01), Johnson et al.
patent: 3984643 (1976-10-01), Inrig et al.
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Electronic Design's Telecom Design 1980, pp. 249-294, Melville (USA); B. Karasch et al., "A Solid State Line Card Using LSI Components", Paragraph II.C.3.
Reedyk Cornelis W.
Retallack Laurence J.
Brady W. J.
Hogeboom Robert C.
Northern Telecom Limited
Rubinson Gene Z.
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