Patent ID: 7657788
Filing Date: 2010-02-02
Classification: G06F

Abstract:
1. A host apparatus communicating with an external device through a communication cable, comprising: an external signal detector for sensing failure in the external device by detecting data signals of the external device through the communication cable; a display; and a controller that causes a predetermined warning message informing of the failure to be displayed on the display, if the external signal detector senses the failure in the external device, wherein the external signal detector detects the data signals supplied through the communication cable and senses whether there is failure in the external device based on whether there is a change in a signal level and signal waveform of the data signals transmitted through a data transmission line included in the communication cable, and wherein the external signal detector further detects power signals supplied through the communication cable and senses whether there is failure in a power line of the external device based on whether there is a change in the power signals.