Patent ID: 7453928
Filing Date: 2008-11-18
Classification: H04L

Abstract:
1. A data transmission device applied to a network apparatus having an automatic crossover function (MDI/MDIX) and connected with a transmission control unit, wherein the transmission control unit is capable of detecting an operating status of the network apparatus and generating a control command to the data transmission device, the data transmission device comprising: a signal adjusting unit for processing a digital data to be transmitted to generate a digital signal compatible with a transmission standard adopted by the network apparatus; a current source generating unit for outputting first current sources and second current sources compatible with the transmission standard adopted by the network apparatus according to the control command generated by the transmission control unit; a first-mode converting unit for converting the digital signal generated by the signal adjusting unit into a first analog signal according to the control command and the first current sources; a second-mode converting unit for converting the digital signal generated by the signal adjusting unit into a second analog signal according to the control command and the second current sources; and a summing unit for summing up the first analog signal and the second analog signal to generate a third analog signal representing the digital data to be transmitted and transmitted via a network medium to a remote end.