Office line holding circuit with an automatic release function f

Details Office line holding circuit with an automatic release function f Office line holding circuit with an automatic release function f

1985-05-09

1987-04-07

Dwyer, James L.

Telephonic communications

Substation or terminal circuitry

Hold circuit

379162, H04M 100

Patent

active

046566600

ABSTRACT:
An office line can be held by a holding path including a thyristor in response to operation of a manual operating hold switch during a call by a telephone set in a direct connection telephone system. A voltage drop on the office line due to an off-condition of any one of the telephone sets in the system caused thereafter can be detected by a capacitor and the thyristor is thereby turned off to release the office line holding condition. The office line holding condition is indicated by a light emission diode, and a hold sound signal is sent out to the office line during the office line holding condition.

REFERENCES:
patent: 4454385 (1984-06-01), Grantland et al.
patent: 4517414 (1985-05-01), Boeckmann

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