Transmission modulator for cable television upstream data transmission
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United States of America Patent
Stats
-
Aug 13, 1996
Grant Date -
N/A
app pub date -
Nov 14, 1994
filing date -
Nov 14, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
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