Telephone-line powered coin telephone chassis
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United States of America Patent
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-
May 25, 1999
Grant Date -
N/A
app pub date -
Jan 17, 1997
filing date -
Jan 17, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A telephone-line powered coin telephone chassis which operates on as little as 23 milliamperes of off-hook loop current and which shuts down on-hook. Capacitors power a microprocessor for a short time during on-hook coin control immediately after a phone call. The chassis is designed to operate with the WESROC.RTM. coin telephone monitoring system and has built-in circuitry which makes a direct communications link between a remote unit of the WESROC system and the chassis. Connectors are built into the chassis for electrically connecting the chassis to the WESROC remote unit and to coin telephone components external to the chassis. Built into the chassis is circuitry for preventing tone fraud and pin fraud, detecting the presence of the handset, a push-button line diagnostic test, an interface for a volume switch and an interface for an electronic coin chute.
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