Time Division SwitchingThe technolo

Time Division Switching
The technology of switching has a long history, most of it covering an era when analog signal switching predominated. With the advent of digitized voice and synchronous time division multiplexing techniques, both voice and data can be transmitted
via digital signals.This has led to a fundamental change in the design and technology
of switching systems. Instead of relatively dumb space division systems, modern digital systems rely on intelligent control of space and time division elements.
Virtually all modern circuit switches use digital time division techniques for
establishing and maintaining “circuits.” Time division switching involves the partitioning of a lower-speed bit stream into pieces that share a higher-speed stream with
other bit streams. The individual pieces, or slots, are manipulated by control logic to
route data from input to output. There are a number of variations on this basic concept, which are beyond the scope of this book