Digital telephone set having an emergency switching function and communication system having the same
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United States of America Patent
Stats
-
Aug 25, 1992
Issued Date -
N/A
app pub date -
May 21, 1991
filing date -
Oct 19, 1988
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A digital telephone set includes a digital telephone circuit and an emergency analog circuit. Normally, the digital telephone circuit is made active so that a handset provided in common therewith is connected to a digital transmission line. In an emergency, the emergency analog circuit is made active instead of the digital telephone circuit so that the handset is connected to an analog transmission line. A dial key pad unit and a speaker are provided in common with the digital telephone circuit and the emergency analog circuit.
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Family
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