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Wednesday, November 14, 2012

Space switching & Time switching

Space switching


Space switching there is a dedicated path (two parallel wires) established between the caller and called subscribers for the entire duration of call in the exchange by the switch. Developed for analog environment, Separate physical paths. Non-blocking switching type. Less signaling requirement from the network. This means then the conversation is going on the switch create the link between two sides. At that time only that call is going in the path.
 
Time switching 

Time switching, it was coming when the PCM is introduced. This switching system involves the sharing of cross points for shorter periods of time. It uses to interchange time slots. In this switching all the components are electronics. Therefore, in time division switching, greater savings in cross points can be achieved. Mostly all modern circuit switches are time-division switches. Multiple low speed inputs share a high speed line. It is based on synchronous TDM.