Time Division Switching
In time division switching, sampled values of speech signals are transferred at fixed intervals.
The time division switching may be analog or digital.
Time division switching involves the sharing of crosspoints for
shorter periods of time. This paves way for the re-assign of crosspoints
and its associated circuits for other needed connections. Therefore,
in time division switching, greater savings in crosspoints can be achieved.
Hence, by using a dynamic control mechanisms, a switching element can be
assigned to many inlet-outlet pairs for few microseconds.
This is the principle of time division switching.
Space Division Switching
In space division switching, a dedicated path is established between the calling and the called subscribers for the entire duration of the call. Crosspoints are used to establish a specific connection between two subscribers. The crosspoints of multistage space switches assigned to a particular connection is dedicated to that connection for its duration. Thus the crosspoints can not be shared