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    • 40. 发明授权
    • System for long reach xDSL over fiber
    • 长距离xDSL光纤系统
    • US09002205B2
    • 2015-04-07
    • US13995018
    • 2011-12-19
    • Manuel Sanchez YangüelaPablo Alberto Yagüe Valentin
    • Manuel Sanchez YangüelaPablo Alberto Yagüe Valentin
    • H04J4/00H04J14/02H04Q11/00H04B10/00
    • H04J14/0227H04Q11/0067H04Q11/0071
    • System for connecting a plurality of digital subscribers to a data network, comprising a local part connected, by an optical fiber link, to a remote part. Said local part comprises a plurality of DSLAM line cards with xDSL over fiber transceiver that, in turn, comprise a plurality of xDSL lines comprising a modified analog front end which comprises an digital-analog converter to transform a transmitted digital downstream signal into an analog downstream signal; an oscillator which fixes an oscillation frequency for the xDSL line; a mixer, directly connected to the output to convert the analog downstream signal into the oscillation frequency; and a band pass filter centered at the oscillation frequency which filters the converted analog downstream signal. And in upstream direction: a band pass filter centered at the oscillation frequency which filters an analog upstream signal; an oscillator which fixes an oscillation frequency for the xDSL line; a mixer, directly connected to the output of the band pass filter to convert the analog downstream signal into the original frequency; a low pass filter to avoid aliasing; an analog front end which comprises an analog-digital converter to transform the converted analog upstream signal into a digital upstream signal.
    • 用于将多个数字用户连接到数据网络的系统,包括通过光纤链路连接到远程部分的本地部分。 所述本地部件包括多个具有xDSL光纤收发器的DSLAM线路卡,其又包括多个xDSL线,其包括修改的模拟前端,其包括数字模拟转换器,用于将发送的数字下行信号转换为模拟下行 信号; 固定xDSL线路的振荡频率的振荡器; 一个混频器,直接连接到输出端,将模拟下行信号转换成振荡频率; 和以滤波转换的模拟下行信号的振荡频率为中心的带通滤波器。 并且在上游方向:以滤波模拟上行信号的振荡频率为中心的带通滤波器; 固定xDSL线路的振荡频率的振荡器; 混频器,直接连接到带通滤波器的输出端,将模拟下行信号转换成原始频率; 低通滤波器,以避免混叠; 模拟前端包括用于将经转换的模拟上行信号变换为数字上行信号的模数转换器。