Patent ID: 8346085
Filing Date: 2013-01-01
Classification: H04B

Abstract:
1. A network interface unit (NIU) comprising: an input for receiving downstream signals from an optical fiber; an optical pathway leading from the input; a laser connected to the optical pathway for transmitting upstream signals to the optical fiber in a first wavelength band; a receiver for receiving downstream signals in a second wavelength band, the second wavelength band not overlapping with said first wavelength band; a first filter between the input and the receiver for filtering signals in a third wavelength band from the optical pathway before signals in said third wavelength band reach said receiver, said third wavelength band including said second wavelength band; a second filter between the input and the laser for filtering signals in a fourth wavelength band from said optical pathway, said fourth wavelength band not overlapping with said first wavelength band or said third wavelength band; and means for preventing processing of the fourth wavelength band downstream of the second filter, wherein said fourth wavelength band comprises a first portion below said first wavelength band and a second portion above said first wavelength band.