an analog electronic circuit is placed between the central office of a telecommunications provider and the customer premises equipment of a digital subscriber line system which uses unshielded twisted pair wires . the electronic circuit separates the downlink signals from the uplink signals with a first mixer . the voice signals , if present , are routed around the electronic circuit unmodified . the downlink signals are amplified , filtered , amplified again with a one or more peaking equalization amplifier , then amplified with drivers which provide the power to drive the downlink signal through a second mixer onto the utp lines to the customer premises equipment . the electronic circuit separates the uplink signals from the downlink signals with the second mixer . the uplink signals are amplified , filtered , and amplified again , then driven onto the utp connected with the central office through the first mixer .