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Figure 1-9. Functional block diagram of an ADM. 4 Digital Cross-Connect Systems A digital cross-connect system (DCS) can be thought of as a circuit switch for digital carrier signals. , VTs, STS-1, STS-Nc) in electrical form and switches them from incoming to outgoing facilities. In addition to this switching function, DCS may provide local add/drop and multiplexing/demultiplexing functions. Industry jargon identifies two basic types of DCS: A broadband DCS (B-DCS) typically accepts OC-N and DS-3 rate signals and cross-connects them internally at the STS-1 rate.

ADMs are sometimes also equipped with time-slot interchange capability to allow flexible assignment of any tributary signal to any eastbound or westbound SPE. Figure 1-9. Functional block diagram of an ADM. 4 Digital Cross-Connect Systems A digital cross-connect system (DCS) can be thought of as a circuit switch for digital carrier signals. , VTs, STS-1, STS-Nc) in electrical form and switches them from incoming to outgoing facilities. In addition to this switching function, DCS may provide local add/drop and multiplexing/demultiplexing functions.

The problem then is to solve for the minimum cost allocation of transmission capacity in (a) (or addition of new capacity to an existing set of capacities) that supports both the routing and protection of all demands in (b). Once a network is built, however, the nearer-term operational problem is one of routing and configuring protection arrangement so that demands that actually arrive are both served and protected within the current as-built capacity. Over the life of a network these two phases are revisited in a constant cycle.

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