Showing papers on "High-bit-rate digital subscriber line published in 2016"

Multi-operator vectoring in digital subscriber line modems

Abstract: Methods, systems, and devices are described for wired communication. A first distribution point uses sets of modems to communicate with a second distribution point over a crosstalk link to exchange information and coordinate the use of multiple sets of frequency bands. In some cases, the first distribution point may share a cable binder with the second distribution point and detect crosstalk on the subscriber lines in the cable binder. Based at least in part on the crosstalk detected by the first distribution point, the first and second distribution points may communicate over a crosstalk link between sets of lines in the binder. The distribution points may use one or more sets of predefined tones within the multiple sets of frequency bands to exchange messages, where the messages may include synchronization information, operating parameters, or control and data information.

Fixed Broadband Communications Systems

Abstract: Three fixed‐line media are of main interest to broadband telecommunications: twisted pair copper wires traditionally used for the telephony system; coaxial copper cables used for inter‐exchange links and cable TV broadcasting; and optical fibre systems used for international and long‐distance telephony and telecommunications backhaul. This chapter presents a chronological account of major milestones in fixed‐line data and digital voice systems. The performance of twisted pair copper wire systems is affected by interference from other telephone connections. This interference is generally known as crosstalk, and exists in two main types: near end crosstalk (NEXT) far end crosstalk (FEXT). While much of additive noise is random and therefore difficult to remove, the crosstalk interference signals are deterministic and therefore it is possible to calculate and remove them from the received signal. Asymmetric digital subscriber line (ADSL)/very‐high‐bit‐rate DSL (VDSL) standards have evolved to deliver higher transmission rates in both upstream and downstream.