Paging system
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United States of America Patent
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Aug 15, 1989
Grant Date -
N/A
app pub date -
Jan 12, 1988
filing date -
Jul 10, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A paging system in which a large number of paging amplifiers may be connected to a pair of signal and power carrying wires having insufficient capacity to carry operating power for the amplifiers. Each of the amplifiers has a local chargeable battery connected to receive charging current from the pair of wires and for operating the associated paging amplifier. Charging power is applied to the pair of wires for charging the batteries during intervals when no paging signal is being carried by the wires. The presence or absence of charging power is detected and the paging amplifiers disabled or enabled respectively in response.
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