A private local exchange is handling calls with the service time as shown in Figure Q1. The call intensity per idle source is calls per time unit. 2 52 3^ - D 0 3 1 3 1 42 2 Figure Q1 2 State the suitable traffic model, the type of source and the offered traffic for this exchange Determine the call congestion and time congestion for this exchange. Calculate the new value for the time congestion if two customers are no longer served by the exchange.