Digital trunk supervisory decoder multiplexor for ground start o

Details Digital trunk supervisory decoder multiplexor for ground start o Digital trunk supervisory decoder multiplexor for ground start o

1978-09-28

1980-03-04

Stewart, David L.

179 15AT, H04J 312

Patent

active

041918576

ABSTRACT:
Digital Carrier Trunks connected via a supervisory decoding and multiplexing logic to an electronic digital PABX. The circuit is arranged to receive or transmit the supervisory signal in either the "Ground Start", E&M modes or a combination of both in either the D2 or D3 signalling format over a T1 carrier span without converting to the analog signal form.

REFERENCES:
patent: 3673330 (1972-06-01), Suntop
patent: 3718767 (1973-02-01), Ellis
patent: 4007334 (1977-02-01), McDonald

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