Packet-switched network having alternate virtual paths

Details Packet-switched network having alternate virtual paths Packet-switched network having alternate virtual paths

1991-10-17

1993-08-24

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 13, 340827, 371 7, 371 82, 379221, H04J 314

Patent

active

052395375

ABSTRACT:
In a broadband ISDN system where each switching node is connected to each adjacent node by a transmission line having communication links and a service link, the switching node comprises a self-routing network for routing a cell from an input to an output of the network according to a virtual path identifier it contains. Static connections are established between communication links and the routing network by a digital cross-connect system. A virtual path memory stores data indicating link-to-link connections associated with normal virtual paths and link-to-link connections associated with alternate virtual paths. A fault detector is coupled to the communication links to detect a link failure. If a link failure occurs, a fault message is transmitted to adjacent switching nodes through service links, and data corresponding to the faulty link is retrieved from the memory in response to a fault message that is received from the fault detector or from an adjacent node. The cross-connect system is controlled in accordance with the retrieved data so that the route of the cells is switched from a normal virtual path to an alternate virtual path.

REFERENCES:
patent: 4884263 (1989-11-01), Suzuki
patent: 4905233 (1990-02-01), Cain et al.
patent: 4993014 (1991-02-01), Gordon
patent: 5016243 (1991-05-01), Fite, Jr.
Standards Project: Broadband Aspects of ISDN T1S1.1/88-427 Oct. 10, 1988, pp. 128-137.

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