Electricity used in headquarters

Alternating current in telephone exchange
In telephone exchanges is used the alternating current to generate, that are used:
– Signal converters,
– Thyristor converters,
– Transistor converters

With a note that in the case of digital systems, all signals have digital form.

Current in the telephone exchange
Another type of current used for the functioning of telephone exchange is current, that generates the actuator. The task of the constant current is to power the telecommunications equipment.