Patent ID: 8255583

Claim:
A method to display a cable connection state in a digital interface system, the method comprising: providing a connection between a source device and a video device by a digital interface cable to support Ethernet communication therebetween; sensing a signal from an Ethernet communication line of the digital interface cable; determining whether the sensed signal from the Ethernet communication line includes a DC level and a digital signal; and generating a signal to display a connection diagram including the source device and at least one other source device connected to the video device, and if it is determined that the sensed signal from the Ethernet communication line does not include the DC level or the digital signal, to display an indication that the digital interface cable is inappropriate and an indication of a position of the inappropriate digital interface cable in the connection diagram, wherein the Ethernet communication line is a 14 th pin of the digital interface cable, wherein the determination comprises analyzing a signal waveform of the 14 th pin, if the Ethernet communication has failed, and wherein the displaying further comprises generating the signal to display a connection diagram indicating connection states and names of the source device and the at least one other source device using at least one of Consumer Electronics Control (CEO) information, a Source Product Description (SPD) infroframe, and Extended Display Identification Data (EDID) information of each of digital interface devices connected to the plurality of source devices.