Hybrid return gate system in a bidirectional cable network

Details Hybrid return gate system in a bidirectional cable network Hybrid return gate system in a bidirectional cable network

1996-11-01

1999-02-02

Grant, Chris

Telecommunications

Interference signal transmission

348 12, H04N 7173

Patent

active

058677640

ABSTRACT:
A bi-directional cable network having a hybrid return gate system that prevents undesirable energy in the bi-directional cable network's return path from adversely effecting the entire network whether the network is operating as a contention based network, a reservation based network, or combination of contention and reservation. The hybrid return gate system comprises a solid state radio frequency switch used to connect and disconnect the return path of a bi-directional communication path in conjunction with a transmission from one of a plurality of remote points. Transmissions from a remote point occur in one of a plurality of dynamically defined contention time slots or reservation time slots. At least one network monitoring time slot can also defined to monitor and/or test the bi-directional cable network. In one embodiment each return gate services a plurality of remote points downstream from the return gate. In a second embodiment each remote point has a dedicated return gate. In either embodiment, the switch in a return gate will connect the return path at the occurrence of a contention time slot accompanied by a return gate enabling prybar signal from a transmitting remote point. A return gate will also connect the return path at the occurrence of a reservation time slot assigned by the headend or due to any other command from the headend.

REFERENCES:
patent: 3750022 (1973-07-01), Curry et al.
patent: 3924187 (1975-12-01), Dormans
patent: 4002843 (1977-01-01), Rackman
patent: 4982440 (1991-01-01), Dufresne et al.
Johanson, B.; Chamberlin B.;Gurusami, A. "HFC Return Ssytem: Management of Subscriber-Induced Noise" pp. 263-268 Society of Cable Telecommunications Engineers 1996 Conference on Emerging Technologies, Philips Broadband Networks, Inc.

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