<title>Designing a family of bidirectional self-healing rings</title>

Abstract

Developments in synchronous (SDHISONET) transmission products has let to increased use of ring structures in telecommunications networks, on account of their "self-healing" properties. Often, a set of nodes is interconnected by a fami1y" of such rings, which all follow the same fiber route. In this situation, each node is served by a subset of the rings in the family. For a given set of nodes and a given matrix of point-to-point traffic, we describe a design methodology that determines which rings should serve each node, and how traffic should be routed on the rings. The objective is to minimize the amount of equipment required. Whereas earlier work has addressed this problem for the case of uni-directional rings, the methodology described here can be applied to bi-directional rings as well.

On stacking bi-directional self-healing-rings on a conduit ring

“…Stacking BSHRs, however, has not been seriously studied as yet, to our knowledge, except by Gawande and Klincewicz (1999). This scarcity, despite the practical importance of resource-efficient BSHRs, may be attributed to the problem complexity that the subproblem of intra-ring demand loading on a BSHR with given capacity should be solved repetitiously.…”