Which kind of switching system does not comprise any subscriber, concentrator or expander?

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• Example of circuit switching and S&F (Stored and Forward) switching is
• Total number of crosspoints in the two stage concentrator network
• Total number of crosspoints in the two stage Expander network
• Total number of crosspoints in the three stage concentrator network
• Total number of crosspoints in the three stage expander network
• Number of inlets and outlets in the two stage concentrator network are given by the formula
• Number of inlets and outlets in the two stage Expander network are given by the formula
• Which of the following memory device stores information such as subscriber’s identification number in GSM?
• Over 20 minutes observation interval, 40 subscribers initiate a call. Total duration of calls is 4800sec. Calculate load offered to network by the subscribers and average subscriber traffic?
• Over 10 minutes observation interval, 20 subscribers initiate a call. Total duration of calls is 2400sec. Calculate load offered to network by the subscribers and average subscriber traffic?