Communication apparatus that suppresses interference of communication signal of communication apparatus using a cable, and method and program for controlling the same

A method for controlling a communication apparatus, comprising:

• using a communication apparatus which comprises:
• a reception unit that receives a reception signal from a metal cable and extracts reception data;
• and
• a transmission unit that sends a transmission signal obtained by modulating transmission data with a frequency included in a first frequency band to said metal cable,
• said method further comprising:
• detecting a signal used in communication using a cable modem, modulated by a frequency included in a second frequency band, and transmitted over said metal cable as an interference signal;
• notifying a user of the presence of said interference signal in said metal cable when said interference signal is detected;
• and
• instructing said transmission unit to modulate transmission data using a frequency included in a third frequency band that does not have any frequency band overlapping said second frequency band when said interference signal is detected and a frequency band overlapping both said first frequency band and said second frequency band exists.

A non-transitory computer readable medium containing a program executed by a computer that controls a communication apparatus, the program executing a method using a communication apparatus including a reception unit that receives a reception signal from a metal cable and extracts reception data, and a transmission unit that sends a transmission signal obtained by modulating transmission data with a frequency included in a first frequency band to said metal cable, the method comprising:

• detecting a signal used in communication using a cable modem, modulated by a frequency included in a second frequency band, and transmitted over said metal cable as an interference signal;
• notifying a user of the presence of said interference signal in the metal cable when said interference signal is detected;
• and
• instructing said transmission unit to modulate transmission data using a frequency included in a third frequency band that does not have any frequency band overlapping said second frequency band when said interference signal is detected and a frequency band overlapping both said first frequency band and said second frequency band exists.