Interface system isolating a subscriber subset from a telephone

Details Interface system isolating a subscriber subset from a telephone Interface system isolating a subscriber subset from a telephone

1979-09-17

1982-01-19

Robinson, Thomas A.

179 617, H04M 342, H04M 1104

Patent

active

043118755

ABSTRACT:
An interface system for installation in a centralized location remote from the customer's premises. A single line is employed in normal operation between the customer's telephone equipment and certain special use equipment such as a centrally located answering and recording equipment. The equipment may be located in a telephone central office or alternately in a separate location remote to both the customer's equipment and the telephone central office. When the equipment is in operation, the customer's phone is isolated from the telephone central office. If the customer goes "off-hook" the equipment is dropped and the customer's line is automatically connected to the incoming call.

REFERENCES:
patent: 2868880 (1959-01-01), Celentano
patent: 3141931 (1964-07-01), Zarouni
patent: 3190961 (1965-06-01), Fitzpatrick et al.
patent: 3865985 (1975-02-01), Stankus
patent: 3965304 (1976-06-01), Marheine

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