On-hook transmission circuit in cable line

Details On-hook transmission circuit in cable line On-hook transmission circuit in cable line

1992-11-05

1994-02-22

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

379376, 379378, 379405, H04M 100

Patent

active

052895378

ABSTRACT:
In an on-hook transmission circuit provided in a subscriber circuit connected between a subscriber terminal and an exchange, a constant-current source unit causes a constant current to flow in first and second wires during a period in which a control signal indicating that on-hook transmission should be turned ON is being received. A loop supervisory unit detects establishment of a loop including the first and second wires and a subscriber terminal connected thereto, and generates a scan signal used for causing the constant-current source means to stop the constant current flowing in the first and second wires after detecting the establishment of the loop.

REFERENCES:
patent: 4455456 (1984-06-01), Cochran
patent: 4827505 (1989-05-01), Takato et al.
patent: 4939777 (1990-07-01), Oka

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