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.

System for party line suppressed ringing access of subscriber lines

Abstract: The system for party line suppressed ringing access enables a service provider to access both a subscriber line and the equipment that is connected to this subscriber line. The present system makes use of the availability of party line communication apparatus, in the form of a subscriber line network interface that is equipped to interface to two lines: the subscriber line, and a telemetry party line. When an incoming call is identified as a suppressed ringing telemetry access call, the serving central office accesses the subscriber line via a suppressed ringing connection on the telemetry party line. The service provider can poll a plurality of the subscribers that are connected to the telemetry party line by means of distinctive signaling to poll each subscriber network interface seriatim. Once the subscriber network interface recognizes a poll received on the telemetry party line, it interconnects the telemetry equipment to the telemetry party line and the telemetry access operation proceeds in well known fashion to retrieve collected telemetry data from telemetry equipment connected to the subscriber line or perform tests on the subscriber line or equipment connected thereto, or perform any other data collection function on the selected subscriber line.

Copper based interface system and data frame format

Abstract: A Bidirectional telephone communication system for supporting a multiplicity of subscriber lines at a downstream distribution terminal using only two of a multiplicity of pre-existing transmission line pairs connected between an upstream distribution terminal and the downstream distribution terminal. Standard PCM data packets are mapped into and disguised as standard European HDSL formatted data.

PRANA at the Age of Four: Multiservice Loops Reach Out

Abstract: Can the French loop plant support voice and multiservice data traffic simultaneously? If so, what techniques are available for practical ISDN operations before 1990, at prices attractive to the domestic subscriber? Four years ago CNET, the French National Center for Telecommunications Research, agreed to back our plan for finding practical answers to those questions. This paper presents our methods and findings. Our program groups capabilities for: voice communications, in either analog or digital form; telematics services, up to 64 kbits/s; and conventional datacomm, at selectable rates up to 9600 bits/s. We call the system PRANA, a French-language acronym for Digital Subscriber Loop System.

System and method for programmable spectrum management

Abstract: Line interface for coupling a twisted pair telephone line with a communications network. The line interface includes a broadband analog front end for coupling the twisted pair telephone line with the line interface, and a programmable filter for filtering frequency bands to separate transmission channels, the transmission channels located in the communications network, wherein the frequency bands are determined by the programmable filter. In this manner, various services can be provided over the twisted pair telephone line.

ISDN echo cancellation circuit (IEC), a transceiver for the subscriber loop

Abstract: The digital part of a two-chip U-interface transceiver for the subscriber loop is presented. According to the ISDN (integrated-services digital network) standard all communication control and algorithmic requirements are implemented for a 144-kb/s full duplex data transmission. The chip is implemented in a double-metal 2- mu m CMOS technology with an area of 8.2 mm*7.3 mm containing 58000 transistors, 15000 of which are implemented in a cell approach, the rest in hand-tuned digital signal processor. >