A method of processing a job is presented. The present invention more particularly provides novel pyrimidine derivatives of the general formula . A first demodulator demodulates the input signal received from the first tuner. A control circuit turns off a power supply of the first detection circuit when the second detection circuit detects \u201cinput present\u201d, and turns on the power supply of the first detection circuit when the second detection circuit detects \u201cinput absent\u201d. At least one data hub node is provided in each geographic area and each hub node is connected to the SMDS network and to the frame relay network.