Network management apparatus, customer premises equipment registration method therefor, and method for providing internet service to customer premises equipment

A network management apparatus that manages a plurality of lines connected to premiseses of Internet service subscribers, the network management apparatus comprising:

• a transceiver that transmits and receives registration signals or registration response signals with customer premises equipment;
• a memory that stores a program for registering the customer premises equipment in the network management apparatus;
• and
• a processor that executes an operation implemented by the program in conjunction with the transceiver and the memory,
• wherein the program includes instructions for:
• transmitting the registration signal to the customer premises equipment;
• receiving registration response signals transmitted from the customer premises equipment through a plurality of lines;
• analyzing the registration response signals introduced from the plurality of lines and distinguishing a direct signal transmitted through a properly connected line and interference signal from the registration response signals;
• and
• establishing a link with the customer premises equipment connected to the properly connected line,
• wherein the interference signal is introduced through adjacent line of the properly connected line among the plurality of lines, and
• wherein the analyzing and distinguishing comprises
• calculating a characteristic curve slope in a low frequency band of a channel frequency response of each line introducing the registration response signal,
• determining the registration response signal as the direct signal when the characteristic curve slope is negative, and
• determining the registration response signal as the interference signal when the characteristic curve slope is positive.