Patent ID: 6359906
Filing Date: 2002-03-19
Classification: H04J,H04L,H04M,H04Q

Abstract:
A local telecommunications network system arranged to provide a first asymmetric digital subscriber line (ADSL) service in a first frequency band to a first set of subscribers and a second very high bit rate digital subscriber line (VDSL) service in a second frequency band higher than said first frequency band to a second set of subscribers said first and second sets of subscribers being served via respective subscriber loops disposed in mutual adjacency in a common multipair communications cable, the system comprising an exchange or switch to which the subscribers are coupled each via a respective subscriber loop routed via said cable to the exchange, first line card means for applying said ADSL service to selected subscriber loops, second line card means for applying said VDSL service to other selected subscriber loops, a main distribution frame associated with the exchange and whereby each subscriber loop is coupled to its respective line card means, each said subscriber loop having said ADSL service being further coupled via a POTS splitter and the main distribution frame to a further telephony line card, first low pass filter means associated with said first line card means, and second high pass filter means associated with said second line card means, wherein each said filter means is arranged to provide a band edge cut-off of its respective first of second frequency band so as to inhibit mutual crosstalk interference of the digital service-carrying signals within said multipair cable between said first and second frequency bands.