Segmented upstream management for cable television
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United States of America Patent
Stats
-
Jan 15, 1985
Grant Date -
N/A
app pub date -
May 11, 1983
filing date -
May 11, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A segmented upstream management system for a bidirectional coaxial network of the type including a bidirectional trunk (14) having a plurality of bidirectional feeders (12) and a plurality of drops (10) is disclosed. The management system includes a number of rerouting devices (36) connected in the bidirectional trunk at intervals so as to divide the number of drops into predefined groups. A plurality of upconverters (40) are connected to the outputs of the rerouting devices. The upconverters are in turn connected to a return only trunk (38) which transmits the frequency diverse, upconverted signals and each respective local oscillator signal from the upconverters to a hub or headend site (16). At the headend site, the return only trunk is connected to a plurality of synchronous down converters (42) which produce down converted signals from each of the predefined groups. FSK and other frequency/phase dependent data retain coherence by phase locking each down converter to the actual local oscillator which provided each respective upconversion. The system has particular application to bidirectional CATV systems which carry digital data transmissions from subscriber drops to a central hub or headend site.
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