Trunk busy test circuit

Details Trunk busy test circuit Trunk busy test circuit

H - Electricity

04

M

344/1.4

H04M 3/12 (2006.01) H04M 3/28 (2006.01)

Patent

CA 1045232

TRUNK BUSY TEST CIRCUIT Abstract of the Disclosure The present invention relates to a make-busy plug. The plug is used in removing a telephone central office trunk from subscriber service and for use in restoring the trunk to subscriber service by a trunk test circuit which is arranged to selectively apply voltages between a busy lead of the trunk and a ground terminal. The plug is comprised of a directional current conducting device for making the trunk appear busy and a unit which is responsive to one of the applied voltages for establishing a make-busy path from the ground terminal through the directional current conducting device to the busy lead and to another of the applied voltages for interrupting the established make-busy path.

301493

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