Personal branch exchange system

Details Personal branch exchange system Personal branch exchange system

1984-10-25

1986-12-30

Brown, Thomas W.

Telephonic communications

Centralized switching system

With generating of call associated substation signal

379379, 379412, H04M 302, H04M 322

Patent

active

046330402

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.

REFERENCES:
patent: 3838223 (1974-09-01), Lee et al.
patent: 3903375 (1975-09-01), DeWit
patent: 4273964 (1981-06-01), Szpindel
patent: 4355206 (1982-10-01), Israel et al.
patent: 4524245 (1985-06-01), Littlefield

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