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.

Method for detecting, on a telecommunication network side, the complexity, on the telecommunication network side, of a telecommunication link between two subscribers in order to determine the rate, and device for realising the same

Abstract: The present invention relates to a telecommunication network and to a method for the optimal definition, on a telecommunication network side, of the complexity (6), on the telecommunication network side, of a desired or existing telecommunication link (6) between two subscribers (1, 7) in order to determine the rate. According to this invention, one subscriber is a mobile subscriber (1) having a mobile radiotelephone, while the other is a fixed subscriber (7) connected to a fixed network. The position (2, radio cell 23a) of the mobile subscriber (1) is then detected. A local call is detected in the case of a telecommunication link (40) between the mobile subscriber (1) and a fixed subscriber (4) whose connection to the fixed network is located, due to the fixed network code, within a local area (3) surrounding the position (2, radio cell 23a) of the mobile subscriber (1). A toll call, which is relatively more expensive than a local call, is detected in the case of a telecommunication link (6) between the mobile subscriber (1) and a fixed subscriber (7) whose connection to the fixed network is located, due to the fixed network code, out of a local area (3) that can be predetermined and that surrounds the position (radio cell 23a) of the mobile subscriber (1).

A network pedestal unit in a telecommunications network

Abstract: A telecommunications network (10) includes a network pedestal unit (20) that receives and sends telephony information from and to a digital loop carrier (16). The digital loop carrier (16) provides and receives telephony information to and from a switching element (12). The network pedestal unit (20) includes a high speed digital subscriber line interface (30), a processing unit (32), and a subscriber interface (34). In the downstream direction, the high speed digital subscriber line interface (30) receives telephony information over a twisted pair link (22) operable to carry the telephony information at an increased bandwidth rate. The high speed digital subscriber line interface (30) decodes the telephony information from the twisted pair link (22) for transfer to the processing unit (32). The multiplexing unit (32) extracts particular telephony information according to its intended destination. The subscriber interface (34) receives extracted telephony information from the processing unit (32) for transfer to a particular subscriber coupled thereto.

Spectral optimization of discrete multitone system on twisted wire copper pairs

Abstract: This paper describes a spectral optimization algorithm that shapes the spectrum of the transmit signal in order to maintain spectrum compatibility between a discrete multitone (DMT)-based transmission system and existing services on twisted wire copper pairs. Performance results are presented for a specific application of DMT to transport asymmetric digital subscriber lines (ADSL) payloads at data rates of over 6 Mb/s in the downstream direction. We consider spectral compatibility between ADSL, the T1 repeater system, high bit-rate DSL (HDSL), and integrated services digital networks (ISDN) basic rate access (BRA) systems. Lagrange multipliers are used to solve the constrained optimization problem.

System and method for switching digital subscriber line service

Abstract: A system and method for providing digital subscriber line service that uses a cross-connect switch to switch in new connections and switch out obsolete connections. The method comprises the steps of: providing digital subscriber line service for a first subscriber via a cross-connect switch connected to a digital subscriber line access multiplexer connected to a digital telecommunications network, the cross connect switch supplying a connection between data processing equipment of the first subscriber and the digital subscriber line access multiplexer; receiving, at a network management system connected to the cross connect switch, an indication that the first subscriber has terminated service; in response to receiving the message at the network management system, transmitting a command to the cross connect switch to switch out the connection of the data processing equipment of first subscriber to the digital access multiplexer; and in response to receiving the command at the cross-connect switch, switching out the connection of the data processing equipment of first subscriber to the digital access multiplexer.

Communications channel performance determination for high-speed access

Abstract: A method and apparatus to determine performance of a subscriber loop includes using a database containing information pertaining to physical characteristics of a subscriber loop (or group of subscriber loops). Based on the information, a data communications speed of the subscriber loop is estimated. An actual data communications speed of the subscriber loop is determined and compared to the estimated data communications speed. The information in the database is updated based on the comparison.