Continuous monitoring in carrier telephone systems

Details Continuous monitoring in carrier telephone systems Continuous monitoring in carrier telephone systems

1976-04-02

1977-08-30

Olms, Douglas W.

179 25R, H04B 346

Patent

active

040456242

ABSTRACT:
A continuous monitoring arrangement for a carrier telephone system utilizes the subscriber carrier at a reduced level when the subscriber set is on-hook. Proper reception of the reduced carrier level at the central office circuit during on-hook condition verifies operability of the carrier frequency circuitry. In a preferred embodiment the central office carrier, which is always present, is modulated by a control tone in the audio range during on-hook conditions. The control tone is detected at the subscriber circuit and modulates the reduced level subscriber carrier whereby reception of the control tone back at the central office circuit verifies operability of all carrier and voice frequency circuits at both subscriber and central office locations.

REFERENCES:
patent: 2572030 (1951-10-01), Jacobsen et al.
patent: 2601425 (1952-06-01), Bartelink
patent: 3806655 (1974-04-01), Hekimian et al.
patent: 3840706 (1974-10-01), Krasin et al.

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