Three relay C. O. trunk interface

Details Three relay C. O. trunk interface Three relay C. O. trunk interface

1985-01-15

1987-08-25

Brown, Thomas W.

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

379240, H04M 322, H04M 714

Patent

active

046898166

ABSTRACT:
An interface system having a single detector to detect incoming signalling including ringing, tip ground, forward loop current, and reverse loop current. Relays and bias control are utilized to perform outgoing signalling and for configuring the system to defect the various incoming signalling states with a single detector.

REFERENCES:
patent: 4310725 (1982-01-01), Mehaffey
patent: 4326104 (1982-04-01), Bergida
patent: 4361732 (1982-11-01), Wood
patent: 4398064 (1983-08-01), Formosa, Jr.
patent: 4431868 (1984-02-01), Bolus et al.
patent: 4535201 (1985-08-01), Kasbia et al.
patent: 4540852 (1985-09-01), Albouy et al.

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