Network Configurations for Leased Circuits in Metropolitan Areas.

With the rapidly increasing demand for leased service, an important issue in the future telecommunication network will be efficient utilization of leased circuits. This paper considers the network configuration for leased circuits in the metropolitan area, where the demand for such circuits is increasing. This paper also discusses the allocation of cross-connect (XC) nodes in the construction of the network for low-speed leased circuits and the segregation/sharing of public and leased circuits from the viewpoint of economy. First, the system configuration for the low-speed leased circuits and the network topology for the efficient operation of the leased circuits are discussed. As a result, allocation schemes for XC nodes and schemes for fiber segregation and transmission capacity are proposed. Then the relation between the number of XC nodes and the network cost, as well as the relation between the transmission capacity and the network cost, are discussed from the viewpoints of the segregated and the shared configurations for the leased and public circuits. From this discussion, the optimal XC node allocation and the optimal transmission capacity are shown. Finally, a comprehensive assessment is described and the optimal area for each of the proposed network configurations is shown quantitatively for the case where the demand for the leased circuit or the equipment cost is varied. [ABSTRACT FROM AUTHOR]