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SDH is the dominant transport technology for delivery of voice and private-line bandwidth services in access and backbone networks. Dynamic service provisioning requires the use of on-line algorithms which automatically compute the path to be taken to satisfy the given service request. Shared Risk Link Group (SRLG) has been widely recognized as an important concept in survivable optical networks. In this paper, a new heuristic SRLG-disjoint path computation algorithm proposed for dedicated protection that take into account the multiplexing structure and standard protection mechanisms defined by SDH.

Mobile Ad-Hoc Network (MANET) is a collection of wireless mobile hosts forming a temporary network without the aid of any stand-alone infrastructure or centralized administration. Due to the mobility of the nodes in the network, these nodes are self-organizing and self-configuring. Not only they act as hosts, but also they function as routers. This paper presents a review on generating a backup path after handling some faults in primary path. Therefore, an efficient route between any two nodes with minimum routing overhead and bandwidth consumption should be established. The design of these routing protocols is challenging due to the mobility and the dynamic nature of the mobile ad-hoc networks. A performance comparison will be conducted to analyse the performance of system. This will use MATLAB tool for simulation.