Loop back control system

Details Loop back control system Loop back control system

1987-08-11

1988-09-06

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 15, 370 88, 34082505, 371 11, H04J 314

Patent

active

047698071

ABSTRACT:
In a loop communication system in which a plurality of stations connected to a pair of loop transmission lines comprised of a main transmission line and a preparatory transmission line communicate with each other through the loop transmission lines, one of the transmission lines has to be looped back to the other when failures occur in both the transmission lines by escaping from a point at which the failures occur. When the master station sequentially transmits loop back command signals to slave stations connected to the loop transmission lines, it takes into consideration the number of slave stations present between the master station and an interrogated slave station inclusive thereof so as to vary the monitoring time in accordance with a turn around time required for the master station to receive a response signal sent from the interrogated slave station being in receipt of a loop back command signal, thereby reducing the time for loop back.

REFERENCES:
patent: 4446551 (1984-05-01), Seo
patent: 4530085 (1985-07-01), Hamada et al.

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