Electronic telephone switching equipment - is controlled by a prerecorded programme with instruction registers

摘要

A telephone electronic switching equipment uses a prerecorded programme. It has test points, operating points and data registers connected by data busbars and controlled by input signals. These inputs signals are produced by control instructions which are identified by an address number. The execution of a control operation consists in giving a set series of instructions with an address given to the first instruction. The address number is written into one of the data registers. The equipment also has a phase generator to produce phase signals, and an input signal generator controlled by the phase signals. The outputs of the input signal generator are used to generate the control instructions and the input signals.