Time division digital local telephone office with telemetering l

Details Time division digital local telephone office with telemetering l Time division digital local telephone office with telemetering l

1975-07-02

1977-02-08

Stewart, David L.

179 15BY, H04J 302, H04J 312

Patent

active

040073343

ABSTRACT:
A line interface unit for a digital local office for telephonic communication has a circuit connected to telemeter low-frequency signals around a line, alternating current, hybrid coupler and reinsert the same signals in the call path at the input to an analog-to-digital encoder that is coupled to a time division switching network. Each interface unit also includes circuits for multiplexing various line unit, digital, status signals with coded call signals and for demultiplexing line unit, digital, control signals from coded call signals. That network is utilized by an office common control for interconnecting various call paths with one another and for interconnecting the common control with the line interface units as required. The common control includes a time-shared digital filter for processing the telemetered signals for various office purposes.

REFERENCES:
patent: 2547549 (1951-04-01), Wennemer
patent: 3244815 (1966-04-01), Anderson
patent: 3443033 (1969-05-01), Louis
patent: 3492435 (1970-01-01), Inose
patent: 3860761 (1975-01-01), O'Neill
patent: 3875339 (1975-04-01), Gruen
patent: 3922495 (1975-11-01), Donohoe

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