Method and apparatus for protection of channel access in broadba

Details Method and apparatus for protection of channel access in broadba Method and apparatus for protection of channel access in broadba

1987-04-23

1989-12-05

Griffin, Robert L.

Telecommunications

Interference signal transmission

455126, 455 3, 358 86, 370 8515, 3408255, H04H 102

Patent

active

048857947

ABSTRACT:
In a cable television system or other broadband cable communications network, improved throughput of inbound data communications by a plurality of transceivers transmitting on a predetermined frequency to a headend facility is provided by an apparatus and method for limiting the time period of the transmissions from failed transceivers. Transceiver failure in a transmitting mode can deprive effective access to the inbound channel to all of the aforesaid plurality of transceivers coupled to a system. In a preferred embodiment the transceiver modulator is disabled upon indication that the transceiver has been generating an inbound signal longer than a certain maximum time. Two protective stages are provided which respond to different indicia that an inbound signal is being generated and these stages then act on separate facilities of the modulator to prevent its operation. At least one protective stage is embodied in strictly passive circuit elements to improve reliability.

REFERENCES:
patent: 4455570 (1984-06-01), Saeki et al.
patent: 4554579 (1985-11-01), Citta
patent: 4586078 (1986-04-01), Citta et al.
patent: 4617565 (1986-10-01), Nakata et al.
patent: 4692919 (1987-09-01), West, Jr.
patent: 4700344 (1987-10-01), Kaino et al.
patent: 4701910 (1987-10-01), Ulug

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