System for communicating digital data on a standard office telep

Details System for communicating digital data on a standard office telep System for communicating digital data on a standard office telep

1987-02-25

1988-11-15

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370123, 370124, 370 95, 379 94, H04J 102, H04J 100

Patent

active

047854480

ABSTRACT:
A network for enabling a local area telephone system to simultaneously carry digital data and analog voice signals on the same tansmission medium. Such a system typically includes a PBX and twisted wire pairs connected to distributed telephone handsets. The network incorporates distributed station units for coupling both voice band signals from telephone handsets and RF signals from data devices to the wire pairs. The station units are physically interconnected in a star configuration with respect to a hub module preferably located in a telephone closet. The hub module includes a plurality of hub units, each uniquely connected by a wire pair to one of the station units. Each station unit and each hub unit incorporates passive filter means to separate voice band and RF band signals. A token passing procedure is used to assign network control to the multiple station units in logical sequence.

REFERENCES:
patent: 4339816 (1982-07-01), Reed
patent: 4644526 (1987-02-01), Wu
patent: 4646296 (1987-01-01), Bartholet et al.

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