Direct access coupler

Details Direct access coupler Direct access coupler

1978-04-20

1980-05-13

Konick, Bernard

179 81R, H04M 1100

Patent

active

042030064

ABSTRACT:
A direct access coupler for connecting a piece of terminal equipment, such as a modem to a telephone line pair, the coupler being of reduced size achieved in part by the use of a miniaturized isolation transformer and a constant current circuit to divert the off-hook current which would otherwise flow through the isolation transformer or a current-shunting choke and by the use of both an optical isolator off-hook circuit and an optical isolator ring detector circuit.

REFERENCES:
patent: 3251951 (1966-05-01), Meewezen
patent: 3789803 (1974-02-01), Davis et al.
patent: 3906167 (1975-09-01), Baker
patent: 3913071 (1975-10-01), Garofalo, Jr.
patent: 3925624 (1975-12-01), Earle et al.
patent: 3965306 (1976-06-01), Watkins
patent: 3988549 (1976-10-01), Merlin et al.
patent: 4004106 (1977-01-01), Yachabach et al.
patent: 4037120 (1977-07-01), Colardelle et al.
patent: 4068282 (1978-01-01), Rigollet

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