Loopback test circuit

Details Loopback test circuit Loopback test circuit

1993-01-21

1993-11-23

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 13, 379 5, 371 204, 371 205, H04J 314

Patent

active

052650898

ABSTRACT:
A digital multiplex communication system for carrying out digital multiplex communication between a plurality of terminal stations, at least two including one initiating party and the other party to communicate with, via a branching unit. In this system, groups of bits in a communication frame are allocated in advance for use in communication between one party and the other. In order to diagnose the state of the transmission line to the other party including the branching unit, loopback setting signals for setting the other party in the loopback test mode and loopback test signals are inserted into specific bit positions of the preallocated groups of bits in performing communication.

REFERENCES:
patent: 4271513 (1981-06-01), Maejima et al.
patent: 4686668 (1987-08-01), Koseki et al.
patent: 4695997 (1987-09-01), Montanari et al.
patent: 4860281 (1989-08-01), Finley et al.

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