Sistema para conectar una pluralidad de abonados digitales a una red de datos que ofrece servicios de xdsl en el que los abonados digitales envian señales ascendentes analogicas a la red de datos y la red de datos envia señales descendentes digitales a los abonados digitales.

摘要

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.