A network architecture for blocking access to mobile pay per use Internet services is provided that comprises an Internet Protocol sniffer that pings the network devices to determine presence of a network device and which further communicates the presence thereof to a server such that access to the Internet services by the network device may be blocked. According to the present invention, it is possible to prevent an ink droplet ejected from the ejection opening in the end group from being deviated toward the central section along the predetermined direction, whereby the generation of white streaks is avoidable when a solid printing is carried out. During the planarzing, a CuO layer is parasitically formed on the surface of the copper layer. The self-testing unit generates is used to determine the gain, frequency characteristics, selectivity, noise floor, and distortion behavior of the receiver, transmitter and LO generator.