Transmission modulator for cable television upstream data transm

Details Transmission modulator for cable television upstream data transm Transmission modulator for cable television upstream data transm

1994-11-14

1996-08-13

Harvey, David E.

Television

Two-way video and voice communication

User positioning

348 12, 455 51, H04N 710

Patent

active

055461190

ABSTRACT:
A cable television upstream data transmission system provides a plurality of uniquely assignable time slots for use by subscriber terminals in upstream data transmission. The unique assignment of time slots provides guaranteed access for each subscriber terminal during its time slot. The width and number of time slots are controlled by a pair of programmable values which may be downloaded from the cable system headend 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 a common network reference signal such as the system 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 network reference signal.

REFERENCES:
patent: 4454538 (1984-06-01), Toriumi
patent: 4553161 (1985-11-01), Citta
patent: 4928177 (1990-05-01), Martinez

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