Patent ID: 7720201
Filing Date: 2010-05-18
Classification: H04B

Abstract:
1. A communication apparatus, comprising: a line control unit configured to control connection with a communication line network; a communication unit configured to transmit and receive data through the communication line network; a detection circuit configured to detect one of a line voltage value and a line current value when the communication apparatus is connected to the line network; a memory unit configured to store multiple voltage-current characteristic curves defining relationships of line voltage values with respect to line current values; an oscillation detection circuit that detects whether an oscillation is generated in the communication line network; an adjusting unit configured to obtain a line voltage value and a line current value, which correspond to the one of the line voltage value and the line current value detected by the detection circuit, based on a predetermined one of the multiple voltage-current characteristic curves stored in the memory unit, and adjusting one of a line voltage and a line current based on the predetermined one of the multiple voltage-current characteristic curves, so that the obtained line voltage value and line current value fall within a predetermined range defined by the predetermined one of the multiple voltage-current characteristic curves; a selecting unit configured to select another one of the multiple voltage-current characteristic curves, which is different from the predetermined one of the multiple voltage-current characteristic curves from among the multiple voltage-current characteristic curves stored in the memory unit; and a re-adjusting unit configured to control the adjusting unit based on the selected another one of the multiple voltage-current characteristic curves selected by the selecting unit after one of the line voltage and line current are adjusted by the adjusting unit, wherein the selecting unit selects the another one of the multiple voltage-current characteristic curves when the oscillation detection circuit detects that the oscillation is generated, after the adjusting unit adjusts the line voltage and the line current based on the predetermined one of the multiple voltage-current characteristic curves stored in the memory unit.