Personal branch exchange system
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United States of America Patent
Stats
-
Dec 30, 1986
Grant Date -
N/A
app pub date -
Oct 25, 1984
filing date -
Oct 25, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A personal branch exchange telephone system including improved interface circuitry to couple the system to outside telephone lines as well as to individual telephone sets on extension lines in the PBX system. The PBX system is connected to the telephone lines only through electromagnetic coupling and circuitry is provided to detect both ringing signals and loop current carried by the telephone lines.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
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