Line switching equipment for switching a personal line to a back

Details Line switching equipment for switching a personal line to a back Line switching equipment for switching a personal line to a back

1991-06-21

1993-05-11

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 13, 370 582, 379 94, 379221, 371 82, 371 112, H04J 302, H04L 1226, H04M 322

Patent

active

052107400

ABSTRACT:
A terminal adapter portion sends and receives data of a data processing unit such as a data terminal device and information of a control portion through an ISDN line. The control portion responds to an externally supplied switching instruction to send switching instruction information to another line switching equipment or receive the information therefrom, through the ISDN line and to control a switching portion. The switching portion switches the data terminal device to either a personal line or the ISDN line depending upon the switching instruction. With this construction, it is possible to perform line switching control of two mutually opposing line switching equipments from either of them. Further, it comprises a line test portion for testing a line and a switching portion for switching the line test portion to either a personal line which is not connected to the data terminal device or the ISDN line, so that it is possible to easily perform a test of the personal line or the ISDN line without degrading on-line data communication.

REFERENCES:
patent: 4119815 (1978-10-01), Frankfort et al.
patent: 4989202 (1991-01-01), Soto et al.
patent: 4998240 (1991-03-01), Williams
patent: 5033079 (1991-07-01), Catron et al.
patent: 5051979 (1991-09-01), Chaudhuri et al.
patent: 5051992 (1991-09-01), Taniguchi et al.

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