Ring interworking between a bidirectional line-switched ring tra

Details Ring interworking between a bidirectional line-switched ring tra Ring interworking between a bidirectional line-switched ring tra

1992-03-26

1995-08-08

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

340827, H04J 116

Patent

active

054405408

ABSTRACT:
Communications circuit connectivity between a bidirectional line-switched ring transmission system and another ring transmission system is continued in the presence of the failure of a first shared node for communications circuits between the ring transmission systems by employing at least one additional shared node for the communications circuits; provisioning one or more duplex communications circuits between the first shared node and the additional shared node; and selectively allowing the one or more duplex communications circuits between the shared nodes to be established in the bidirectional line-switched ring when a ring node in the bidirectional line-switched ring in the first shared node has failed.

REFERENCES:
patent: 4538264 (1985-08-01), Bahr et al.
patent: 4759009 (1988-07-01), Casady et al.
patent: 4835763 (1989-05-01), Lau
patent: 5179548 (1993-01-01), Sandesara
patent: 5218600 (1993-06-01), Schenkyr et al.
patent: 5218604 (1993-06-01), Sosnosky
"Sonet Line Protection Switched Ring APS Protocol", T1X1.5/91-026, J. Baroni et al., AT&T Network Systems.
"Sonet King Applications for Survivable Fiber Loop Networks", IEEE Communications Magazine, Jun. 1991, J. Sosnosky et al., pp. 51-58.
"Further Considerations on 2-Fiber Bidirectional Line Switched OC-48 Rings", Contribution to T1 Standards Project--T1X1.5/91-019, G. Copley et al. Feb. 6, 1991.

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