Upstream data transmission system for cable television

Details Upstream data transmission system for cable television Upstream data transmission system for cable television

1995-02-07

1996-07-09

Marcelo, Melvin

Multiplex communications

Wide area network

Packet switching

370 82, 348 12, 455 51, H04L 522

Patent

active

055352065

ABSTRACT:
A cable television upstream data transmission system provides a plurality of time slots synchronized to the downstream symbol clock for use by subscriber terminals in upstream data transmission. The width and number of time slots are controlled by a pair of downloadable values to accommodate dynamic changes of the cable system. A transmission modulator used within the subscriber terminal produces an upstream transmission carrier having a frequency locked to the symbol clock. The frequency of the carrier signal produced by the transmission modulator is programmably controlled by a plurality of program values which are selected to provide frequency and phase lock of the modulator's carrier to the symbol clock.

REFERENCES:
patent: 4528663 (1985-07-01), Citta
patent: 4553161 (1985-11-01), Citta
patent: 4860283 (1989-08-01), Takano et al.
patent: 5127002 (1992-06-01), Shaik et al.

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