Telephone communication system and method over local area...

Details Telephone communication system and method over local area... Telephone communication system and method over local area...

2005-07-25

2008-11-04

Qureshi, Afsar M. (Department: 2616)

Multiplex communications

Phantom

C370S258000, C370S352000, C370S434000, C379S158000

Reexamination Certificate

active

07447144

ABSTRACT:
A method and apparatus for enabling a local area network wiring structure to simultaneously carry digital data and analog telephone signals on the same transmission medium. It is particularly applicable to a network in star topology, in which remote data units (e.g. personal computers) are each connected to a hub through a cable comprising at least two pairs of conductors, providing a data communication path in each direction. Modules at each end of the cable provide a phantom path for telephony (voice band) signals between a telephone near the data set and a PBX, through both conductor pairs in a phantom circuit arrangement. All such communication paths function simultaneously and without mutual interference. The modules comprise simple and inexpensive passive circuit components.

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