Method for performing continuity check in an electronic exchange

Details Method for performing continuity check in an electronic exchange Method for performing continuity check in an electronic exchange

1992-04-20

1994-10-04

Chin, Stephen

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

With blocking of normal usage

379 24, 379 26, 370 14, 370 16, H04M 124, H04M 308, H04J 116

Patent

active

053533267

ABSTRACT:
A method of performing a continuity check on a speech channel in an electronic exchange system includes indicating and transmitting a continuity check request on a continuity check indicator located in a head address message if characteristics of a trunk module turn out the continuity check request while handling an outgoing call to a counterpart, and connecting a speech channel with a continuity check tone transceiver to transmit therethrough a continuity check tone; monitoring whether the continuing check tone that was transmitted through a forward channel is received back through a backward channel within a predetermined time; and if said continuity check tone is received back, terminating transmission of the speech channel from the continuity check tone, causing a timer to stop counting, and disconnecting said continuity check tone transceiver.

REFERENCES:
patent: 4024359 (1977-05-01), De Marco et al.
patent: 4421955 (1983-12-01), Mori et al.
patent: 4421955 (1983-12-01), Mori et al.
patent: 4566093 (1986-01-01), Diaz
patent: 4679224 (1987-07-01), Lynch et al.

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