Loop back system for loop transmission line

Details Loop back system for loop transmission line Loop back system for loop transmission line

1984-02-28

1985-08-27

Schreyer, Stafford D.

Telegraphy

Systems

178 2C, 178 2D, H04L 1116

Patent

active

045380260

ABSTRACT:
A loop back system for a loop transmission line allows the whole system to be looped back for addition or removal of a transmission device, without cutting off loops and in exactly the same manner as in ordinary data transfer. A plurality of transmission devices capable of generating loop-back commands are connected to an active loop and a backup loop. First one of the transmission devices transmits loop-back commands, while second and third ones individually receive the loop-back commands to connect their transmitter sides to both the active and backup loops. This sets up a loop-back condition in each of the transmission devices.

REFERENCES:
patent: 4190821 (1980-02-01), Woodward
patent: 4380061 (1983-04-01), Mori et al.

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