Telephone exchange with time shared speech paths and selectively

Details Telephone exchange with time shared speech paths and selectively Telephone exchange with time shared speech paths and selectively

1979-03-30

1981-06-30

Brown, Thomas W.

Multiplex communications

Wide area network

Packet switching

H04M 356

Patent

active

042766397

ABSTRACT:
A telephone exchange comprises a plurality of central office trunk circuits, a plurality of line circuits, a plurality of switching circuits coupled to transmission paths of the trunk and line circuits, a plurality of switching circuits coupled to the reception paths of the trunk and line circuits, a variable attenuator having one end coupled commonly to the switching circuits that are coupled to the transmission path, a conference circuit coupled to the variable attenuator and the switching circuits that are coupled to the reception paths, a control circuit which controls both groups of switching circuits and the variable attenuator in time-sharing fashion thereby to provide speech paths in time-sharing fashion between selected ones of the central office trunk circuits and line circuits and which controls in time-sharing fashion the attenuation factor of the variable attenuator for each speech path established. The telephone exchange further comprises another variable attenuator which is coupled between the conference circuit and the switching circuits coupled to the reception paths and whose attenuation factor is controlled by the control circuit in time-sharing fashion.

REFERENCES:
patent: 3761624 (1973-09-01), Lewis et al.
patent: 3882276 (1975-05-01), Feiner et al.
patent: 4024349 (1977-05-01), O'Neill
"GTD-120 Digital PABX", by G. F. Fetterer, GTE Automatic Electric Journal, Oct. 1975, pp. 350-359.

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