Control signal transmission system for key telephone system
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United States of America Patent
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Nov 5, 1985
Issued Date -
N/A
app pub date -
Mar 8, 1984
filing date -
Jul 30, 1979
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A control signal transmission system for a key telephone system, in which control signal information is transmitted in a parallel signal configuration between a plurality of key telephone sets and a key service unit by the use of transmission lines one-to-one corresponding to the individual key telephone sets, and in which the information between the key telephone sets is transmitted using a serial signal format of a frame configuration so that time slots of respective frames are synchronized with respect to all of the transmission lines.
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