|
Abstract : |
In this paper we design distributed protocols for synchronization in SDH networks. We start by suggesting a new abstraction to model the communication of control information in SDH/SONET frame headers. The new model is then used in the construction of realistic and fault-tolerant distributed protocols for the timing distribution problem. In this problem the nodes of an SDH/SONET network should be synchronized to transmit at the same rate; otherwise the data carried by the network may be impaired. The presented protocols ensure that (1) all the nodes derive their transmission clock from one source, (2) that this source is the highest quality clock available in the network and (3) that the path along which the clock at a node is derived is the shortest path from the source to the node. The design of the presented protocol employs modern techniques from the field of distributed computing adapted to the model and tools available in a real SDH/SONET network., |
