Self-healing loop communications system

Details Self-healing loop communications system Self-healing loop communications system

1978-10-02

1980-02-26

Yusko, Donald J.

Communications: electrical

Digital comparator systems

179 15AL, H04Q 900, H04J 314

Patent

active

041908210

ABSTRACT:
Primary and back-up closed loop unidirectional transmission lines transmit self-clocking data streams and null data, respectively, in opposite directions to a plurality of loop interface units (LIUs) connected to the primary and back-up lines. To protect against failure of the entire system due to a break in the primary and/or back-up lines or failure of one of the loop interface units, each loop interface unit can detect a signal loss on the primary or back-up transmission line and wrap signal flow to bypass the detected fault. After wrapping around a detected fault, an LIU then creates a failure on the non-failing line causing an analogous wraparound in the LIU on the other side of the actual failure. After error recovery, there is then a complete loop connecting all non-failing loop interface units, although it is twice as long as before the signal loss was detected. Also disclosed is an alternate embodiment in which a microprocessor and attached external device are interconnected to a similar loop structure.

REFERENCES:
patent: Re28958 (1976-09-01), Zafiropulo et al.
patent: 3652798 (1972-03-01), McHeilly et al.
patent: 4007441 (1977-02-01), Faber
G. J. Laurer et al., "Automatic Loop Reconfigurator", IBM Technical Disclosure Bulletin, vol. 19, No. 10, Mar. 1977, p. 3824.
P. Zafiropulo, "Performance Evaluation of Reliability Improvement Techniques for Single-Loop Communications", IEEE Transactions on Communications", vol. COM-22, No. 6, Jun. 1974, p. 742.
E. Hafner et al., "Enhancing the Availability of a Loop System by Meshing", 1976, International Zurich Seminar.

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