Data error detecting apparatus for key telephone system and the

Details Data error detecting apparatus for key telephone system and the Data error detecting apparatus for key telephone system and the

1991-01-16

1993-02-16

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 13, 379 5, H04J 116

Patent

active

051877058

ABSTRACT:
An apparatus for executing loop-back tests in a key service unit (50) of a key telephone system, including an ISDN interface unit (2) connected to an ISDN (30) is disclosed. When any one of speech channels of the ISDN (30) is not used, a predetermined test pattern data is transmitted through a time slot of the down-stream speech highway (3b) allocated to the unused speech channel to the ISDN interface unit (2). Then the test pattern data is returned back in the ISDN interface unit (2) and transmitted to a time slot of the up-stream speech highway (3a) allocated to the unused speech channel. The test pattern data transmitted to the up-stream speech highway is compared with the original test pattern data for executing the loop-back test.

REFERENCES:
patent: 4688208 (1987-08-01), Kawaguchi
patent: 4860281 (1989-08-01), Finley et al.
patent: 4961180 (1990-10-01), Schwarz et al.
patent: 4989202 (1991-01-01), Soto et al.

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