Transmission device capable of readily controlling active and ba

Details Transmission device capable of readily controlling active and ba Transmission device capable of readily controlling active and ba

1992-08-21

1994-09-06

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 13, 371 81, 34082501, H04J 116

Patent

active

053454383

ABSTRACT:
In a transmission device which includes first and second sections each of which has a first package stage and a second package stage connected to the first package stage through a back board, the first package stages in the first and the second sections are connected to input lines given the same input signals, respectively. The first and the second sections are selectively operable as an active and a backup section and comprise fault detectors, signal distributors, and switch circuits connected to the signal distributors in the first package stages, respectively. Each of the switch circuits has a plurality of outgoing internal lines each of which is connected in common to a selected one of the outgoing internal lines of another switch circuit on the back board to be connected to one of the second package stages. A switch controller monitors only the fault detectors of the first package stages in the first and the second sections to detect a fault. On detection of the fault of the active section, the switch circuits are controlled by the switch controller to switch the active and the backup sections from one to another and to recover the fault by the backup section. A pair of the transmission devices may be connected to preceding stages of high speed packages which are divided into active and backup high speed packages.

REFERENCES:
patent: 4232206 (1980-11-01), Tooyama
patent: 4700348 (1987-10-01), Ise et al.
patent: 4763316 (1988-08-01), Schaich et al.
patent: 4847837 (1989-07-01), Morales et al.
patent: 5146474 (1992-09-01), Nagler et al.

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