Double ring-type local area network system capable of switching

Details Double ring-type local area network system capable of switching Double ring-type local area network system capable of switching

1997-06-23

1999-07-06

Nguyen, Chau

Multiplex communications

Fault recovery

Bypass an inoperative station

370508, 370517, H04J 314

Patent

active

059205431

ABSTRACT:
In a ring-type network system including a plurality of nodes connected by an L-ring and a R-ring, each of the nodes is constructed by a branch unit for branching data to first and second directions, a first delay unit for delaying the data in the first direction by a first delay time period, a second delay unit for delaying the data in the second direction by a second delay time period, a first combiner for inserting the delayed data in the first direction into a first time slot of a data frame on the L-ring, and a second combiner for inserting the delayed data in the second direction into a first time slot of a data frame on the R-ring. Also, each of the nodes is constructed by a first distributor for extracting data from a second time slot of a data frame on the L-ring, a second distributor for extracting data from a second time slot of a data frame on the R-ring, a third delay unit for delaying the data extracted by the first distributor by a third delay time period, a fourth delay unit for delaying the data extracted the second distributor by a third delay time period, and a switching unit for passing one of outputs of the third and fourth delay units.

REFERENCES:
patent: 5307353 (1994-04-01), Yamashita et al.
patent: 5469428 (1995-11-01), Tokura et al.
patent: 5745476 (1998-04-01), Chaudhuri

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