The C-DOT switches have a distributed architecture.  A Base Module (BM) has 512 ports which can provide non-blocking connectivity and can acept concentrated subscriber lines.  The BM, capable of serving upto2 000 lines or 512 trunks, is used as the basic building block.   Each BM is housed in a single cabinet.  By interconnectin upto 32 such BMs through a Central Module (CM), the switch can support upto 40000 lines.  The system can support upto 4:1 concentration.  Lines and trunks can be inter-mixed in the same BM.

The front-end of the system consists of an Input Output Processor (IOP) connected to the Administration Processor (AP).  Each system consists of two IOPs working in duplex mode.  IOP, based on Motorola 68010 and supporting UNIX environment, provides interface for the man machine communication, system initialisation support, operator features, etc.

The switch is capable of Local, Trunk and Integrated-Local-cum-Transit applications.  It is meant to provide cost-effective solution for metropolitan needs.  There is commonality of hardware, software, features and facilities, packaging, operations and maintenance, etc.

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