Television – Special applications – Manufacturing
Patent
1993-07-09
1994-07-19
Eisenzopf, Reinhard J.
Television
Special applications
Manufacturing
455 42, 455 61, H04H 102
Patent
active
053314123
ABSTRACT:
A circuit is supplied at the tap from a feeder which monitors certain signals coming from the single dwelling interdiction unit (SDI unit), and if the signals are interrupted, removes service from the premises. In order for service to be reinstituted to the subscriber DC power from the SDI unit must be received at the tap and the tap address must be communicated from memory in the SDI unit (where it had been previously stored upon installation by an installer) to the tap microprocessor. In accordance with an alternative embodiment in order for the service denial switch to remain closed, supplying signals to the SDI unit then to the home, the following must occur. Direct current power must be supplied from the SDI unit to the tap and data must be supplied from the SDI unit, in the form of pulses going from the normal powering level of, for example 12 volts, to 0 volts momentarily on a continual basis and not just at initialization as in the first embodiment. This data communicates a "keep alive" message to the tap, and may be changed from time to time. In accordance with another embodiment, AC power may be supplied by the SDI unit to the tap instead of DC power.
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Farmer James O.
Thatcher W. Brad
Eisenzopf Reinhard J.
Pham Chi H.
Scientific-Atlanta, Inc.
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