Architecture
5ESS has three main kinds of Module: AM is Administrative Module, which contains the central computers. CM is Communications Module, which is the central time-divided switch of the system. SM is Switching Module which in most exchanges is the majority of equipment. SM performs multiplexing, analog/digital coding, and other work to interface with the outside world. Each has a controller, a small computer whose CPUs and memories, like most common equipment of the exchange, are duplicated for redundancy. Distributed system lessens the load on the Central Administrative Module (AM) or main computer.
Power for all circuitry is distributed as −48VDC (nominal) and converted to logic or telephone voltages as needed by DC to DC converters on each shelf of circuit packs.
Read more about this topic: 5ESS Switch
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