What is time division switching? With the help of block diagram explain basic time division and time switching method.

Time Division Switching: A switching component can be shared at the same time with number of active speech circuits. It is the principle of time division switching. Evidently, with the way the switching components are shared in time division switching, much superior savings can be achieved into the number of switching components as compared to multistage space division switching.

Basic Time Division Switching: The functional blocks of a memory based time division switching switch is demonstrated in figure and its corresponding circuit in figure. In this organisation, all the data coming in by the inlets are written in the data memory and later read out to the suitable outlets. The outgoing and incoming data are generally in serial form while the data are written in and read out of the memory in the parallel form. This therefore, becomes essential to perform serial-to-serial conversion as well as parallel-to-serial conversion at the inlets and outlets correspondingly. For convenience, the data-in and data-out parts of the MDR are demonstrated separately for the data memory in figure given below, though in reality, MDR is a single register. Because there is only one MDR, a gating mechanism is essential to connect the needed inlet/outlet to MDR. It is done through the in-gate and out-gates units.

FIG - Simple PAM Time Division Switching.