An HDSL chipset for high-speed transmission over copper

High bit-rate digital subscriber line (HDSL) is an emerging technology that significantly simplifies the deployment of T1 and E1 data-rate services. With the use of adaptive equalization and echo cancellation techniques, HDSL technology eliminates the need for repeaters and line conditioning. This has enormous implications for the RBOCs and PTTs because of its potential to deliver T1 and E1 service quickly, reliably, and at a lower cost. Furthermore, HDSL technology is compatible with fiber. This comes at a time when everybody is talking about information super highways on fiber, but all these fiber super highways need off-ramps to the customer. The beauty of HDSL is that it takes advantage of the existing large installed base of copper, significantly boosting the bandwidth of the signal that can be transmitted in the “last mile” connection to the customer. A key milestone in realizing the true advantages of HDSL technology is the worldwide availability of low-cost VLSI chips. This paper describes the technical details of such a chipset