PLANET is an integrated software package aiding several steps of the transmission network planning, as well as the traffic simulation. The database of PLANET consists of the structural and the cost models of the transmission systems, the topological alternatives, the circuit routing and grouping rules, etc. The topological and transmission plans of the networks are obtained based on the traffic planning results checked by simulation and they are stored systematically with the input data in the database of plans. The results describe the network topology, the circuit routes meeting different kinds of routing conditions, the grouping solutions and the equipment assignments to the circuit demands of different services. The users of PLANET are provided with lists and graphical documentation that can be directly used in the development of the network. The global structure of the software package as well as the algorithms of specific phases are discussed and the results obtained by the application of PLANET are demonstrated.>

An analysis of 1-persistent carrier-sense multiple-access (CSMA) protocols (possibly with collision detection (CD)) operating in fixed-length time intervals is presented, and closed-form results for the transient protocol throughput and average packet delay are derived. Such results provide a basis for the performance evaluation of integrated local area networks where the 1-persistent CSMA(-CD) protocol is used only in a portion of a fixed-length frame whose remaining part is devoted to the transmission of isochronous traffic. Numerical results are given which provide insight into the transient behavior of 1-persistent CSMA and CSMA-CD protocols.>