Switching matrix

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Schematic representation of a switching network

A switching network , formerly known as crossbar distributor ( English crossbar switch hereinafter) is used for switching and switching through digital or analog signals . It is one of the so-called room multiplex processes in communication technology . Input signals are switched to the corresponding outputs in a completely transparent manner (without changes or falsifications).

A switching network is an interconnected matrix (so-called switching matrix) of incoming and outgoing lines. The switching network has the task of connecting the input lines to the output lines via so-called crosspoints ( called “switches” in the graphic).

If the switching network has more input lines than output lines, it is called "blocking" because not all input lines can be switched through to output lines at the same time.

Switching matrices are usually implemented with highly integrated circuits and can usually only switch through digital signals. Coupling matrices in relay technology can also switch through analog signals, but are rarely used today. They can still be found in the military sector. It is important that a bistable relay can remain in its switching state even if the power supply fails.

A typical field of application for switching networks are switching equipment in the telecommunications equipment , mainly telephone exchanges.

Types of switching networks

Space coupling network

It consists of a large number of crosspoints. The coupling point is the switching point that connects an input with an output. Thereby serve u. a. Transistors as switching elements.

Time-multiple coupling network

Changing the chronological order of the channels by sorting them into time slots .

literature

  • Erwin Rathgeb, Eugen Wallmeier: ATM - infrastructure for high-performance communication. Springer Verlag, Berlin 1997, ISBN 978-3-642-64373-6 .
  • Florian C. Scholz: Audio technology for media designers. Verlag Walter de Gruyter, Berlin 2005, ISBN 978-3-11-037101-7 .
  • Dieter Conrads: data communication. Procedure - Networks - Services, Vieweg Verlag, Braunschweig 1989. ISBN 978-3-528-04589-0 .

Web links