Loop transmission system having automatic loop configuration con

Details Loop transmission system having automatic loop configuration con Loop transmission system having automatic loop configuration con

1985-07-11

1987-12-01

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 88, H04J 314

Patent

active

047109157

ABSTRACT:
A token-passing type loop transmission system including a plurality of node stations and first and second loop transmission lines, which lines transmit signals in opposite directions. Each node station includes a first and second loop-back circuits and a ring control circuit. The ring control circuit monitors signals passing through the node station, changes end paths in the first and second loop-back circuits to operatively connect the first and second loop transmission lines or to restore the first and second loop transmission lines to a normal state in each loop-back circuit, and transmits a signal on the first or second loop transmission line through the first or second loop-back circuit. By the combination of operations of the node stations, the loop transmission system performs automatic loop configuration control of detection of a fault point therein and constructs a transmission loop line not including the fault point.

REFERENCES:
patent: 3569632 (1971-03-01), Beresin
patent: 3859468 (1975-01-01), Smith et al.
patent: 3876983 (1975-04-01), Zafiropulo et al.
patent: 4190821 (1980-02-01), Woodward
patent: 4527270 (1985-07-01), Sweeton
"A Token-Ring Architecture for Local-Area Networks", Andrews et al., Mar. 8, 1982, pp. 1-27, (International Business Machines Corporation, Communication Products Division).

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