High-bit-rate digital subscriber line

About: High-bit-rate digital subscriber line is a research topic. Over the lifetime, 516 publications have been published within this topic receiving 8537 citations. The topic is also known as: HDSL & high-bit-rate DSL.

Circuit arrangement for the subscriber line circuits of a digital time division multiplex telecommunication exchange

Abstract: Where the same information is received by several subscriber line circuits (SLIC/ALAP), and thus subscriber terminals (TE) in the same time slot (broadcasting), both a transmitting time slot and a receiving time slot are allocated as in the case of a normal connection, but an access of the transmitting branches of the subscriber line circuits to the bus line (PCMA; PCMB) leading to the switching network is prevented in order to avoid output stages in the transmitting branches of the subscriber line circuits which operate against one another from being damaged. … …

Wide band communication system optical network current supply - supplies electric energy for opto-electric conversion and to devices at subscriber end individually from subscriber

Abstract: Subscribers connected to a common network are connected to a number of optical data transmission lines (LWL) provided from the central exchange (AMT) to the subscribers (TN). The energy supply for the devices (SV) at the subscriber end, such as bells, D/A converters etc., is provided by the subscriber (TN). Each subscriber terminal (TN) may be associated with an opto-electronic converter (O/E). The power for these is provided directly from the respective subscriber end memory devices (SV). ADVANTAGE - System operator only has to supply data lines. Electric energy for devices at subscriber end is supplied by subscriber himself.

An Examination of High Bit Rate Data Transmission by Metallic Cables for Railways

Abstract: This report examines the elements needed for high bit rate data transmission such as used in Digital Subscriber Line (xDSL) transmissions along existing metallic cables. Old carrier systems used frequency division multiplex and time division multiplex are used in transmitting voice and data over these same cables for railway operations. As the need for higher rates of data transmission grows, it is hoped to be able to continue to use metallic cables. The report gives examples of the types of information transmitted through metallic cables on railways, with rate and frequency. The xDSL transceiver's relation to the existing system is important to knowing how it will perform. The researchers measured its basic performance under ideal conditions to less the maximum transmission distance and they concluded that transmissions could be completed without relays. They also tested how the xDSL and the existing system influenced each other and found acceptable performance if the cable arranged to reflect the needs when several xDSL transceivers are operating on the same local cable. They conclude that xDSL technology is likely to be useful and determined the basic data needed for introducing it into railway operations. More research should be able to produce enough information to create final guidelines.

The Alcatel experience of DSL deployment

Abstract: Incumbent telcos desire to make the optimum use of their existing copper pair networks in order to deliver the new services required by their customers. This enables the incumbent telcos to compete with new operators who use alternative technologies, without incurring the very high costs of building new infrastructure. The technologies used by the new operators include cable TV systems, which can be extended to offer not only broadcast TV, but also telephony, fast Internet access and other data services, as well as video on demand. Other competing technologies are satellite, which can be combined with a telephony back channel to provide a limited interactive service, radio microwave distribution, and all fibre systems. However, the price performance combination of the DSL technologies is so attractive that even new operators are increasingly making use of them. There is now a range of different DSL technologies available for high speed transmission over copper, which are appropriate to the requirements of different customers. These include HDSL and SDSL for symmetric services mainly to business customers, ADSL for asymmetric services to residential and SOHO customers, and VDSL for very high-rate symmetric or asymmetric services to business or residential customers. VDSL has a relatively short range, and is thus often operated from street cabinets, although operation from exchange buildings is sometimes done. HDSL, SDSL, and ADSL can be operated from exchange buildings or street cabinets as appropriate. This paper outlines the range of Alcatel DSL products, and the experience of their deployment.

3.3-V line drivers for digital subscriber line applications

Abstract: In this paper, we designed 3.3-V line drivers for DSL (digital subscriber line) applications. The line driver consists of pre-amplifier, error amplifiers, output transistors, and quiescent current (I/sub Q/) control circuits. A new method is proposed for the quiescent current control circuit in order to obtain high linearity performance. One driver is designed for ISDN U-interface and the other for HDSL applications. Both drivers are fabricated in a 0.35-/spl mu/m n-well CMOS technology and THD (total harmonic distortion) better than -64 dB is achieved.