Data communication in CATV system
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United States of America Patent
Stats
-
Jun 12, 1984
Grant Date -
N/A
app pub date -
Jul 23, 1982
filing date -
Jul 24, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A CATV system having a central facility connected through cables to a number of terminal units to establish two-way data communication. Each terminal unit includes a PLL that oscillates at a frequency corresponding to a channel selected. A frequency divider circuit subjects an output frequency of the PLL circuit to frequency division to provide a carrier frequency for an up-stream data signal. The central facility transmits programs and down-stream data signals through a plurality of channels. Each terminal unit transmits an up-stream data signal to the central facility by using an exclusive frequency corresponding to a channel selected.
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