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.

Computer based optimization techniques for the design of HDSL

Abstract: The design and optimization of the high-speed digital subscriber line (HDSL) need powerful computational strategies. Traditional techniques of distributing poles and zeros on Smith charts generally do not work. In the past, such approaches have lead to suboptimal designs for applications where the data capacity sought is considerably less than the Shanon capacity of the lines. Typical subscriber loops are less than perfect and for the current demands on the HDSL at T1/T2 and E1 rates every possible venue for the HDSL design need to be investigated, if not exploited. The authors present flexible computational techniques that explore and optimize system components in view of operating environment of the HDSL and/or the asymmetric digital subscriber line (ADSL), and the inherent limitations of the system components. The optimization occurs automatically by forcing the computer to track the effects of incremental changes of the subsystem performance (e.g. echo cancelers or equalizers), or the component values (R's and C's in the matching circuits) in context of the functional constraints of the line (HDSL, ADSL, duplex, dual-duplex, triplex, etc.) in conjunction with the subscriber loop (CSA, Loops >

Method for simultaneous transmission of a telephone link and a data link, in particular a videotex link, on conventional two-wire copper lines between digitally controlled exchanges and digital subscriber devices

Abstract: For simultaneous transmission of a telephone link and of data information on conventional two-wire copper lines between a digitally controlled exchange and a digital connection device at the subscriber end, the transmission channel used is divided on the connection lines into a speech channel and a data channel, which are then separately switched. At the subscriber end and also in the digital exchange, digital connection devices or subscriber circuits are used to divide or combine information into one transmission channel.

Digital subscriber line multiplexer

Abstract: A system and method for increasing the number of lines receivable by a subscriber of digital telecommunication services when the pre-existing interior lines of the subscriber's premises is less than the number of digital lines to be received is provided. A master multiplexor is located at the subscriber's side of a network interface connector and is connected to a slave demultiplexor located within the subscriber's premises via an interior, pre-existing twisted-pair line. In a first embodiment, two or more digital lines extend from the central office of the service provider to the subscriber's premises terminating at the network interface connection. Digital data received from the digital lines is multiplexed by the master multiplexor across the interior, pre-existing twisted pair line to the slave demultiplexor. The slave demultiplexor demultiplexes the digital data and provides it to two or more digital lines located within the subscriber's premises to which digital data receiving devices are connected. In a second embodiment, one or more digital lines and one or more analog lines from the central office are multiplexed by the master multiplexor to the slave demultiplexor which provides the demultiplexed digital data to digital lines and analog data to analog lines, both of which, located within the subscriber's premises. In a third embodiment, broadband services for multiple tenants comprising multiple protocols are provided over one or more lines from the CO to a NIC at a multi-tenant dwelling. The requirements for each subscriber in a multi-tenant dwelling are then subdivided by a master multiplexor, and multiplexed, if required, over one or more single interior twisted-pair to a slave demultiplexor at the respective tenants premises.

Method for transmitting control information over an HDSL transmission link

Abstract: The invention relates to a method for transmitting control information over an HDSL transmission link. The HDSL transmission link (36) is connected to an SDH network, whereupon according to the invention (a) data from the SDH network to the HDSL link is mapped into the frame structure according to the HDSL system, and (b) pointers required by the SDH network are generated in the data frames passing from the HDSL link to the SDH network, the pointers indicating the phase of the payload within the frame structure. In order to provide a transparent control channel to control, from the SDH network, the part of the telecommunications network situated beyond the HDSL link, the control channel is formed of the pointer bytes V4 of the TU-12 frames to be transmitted over the HDSL link.

Arrangement for subscriber circuits utilizing digital time division multiplex telecommunication installations and particularly for PCM local exchanges

Abstract: Subscriber circuits used for connecting analog operated subscriber line to digital switching networks have analog circuit portions which are individually associated with the individual subscriber lines and also have circuits for coding and decoding signals. Digital control and interface circuits are commonly associated with a plurality of such subscriber circuits and in the present invention the analog circuit portions which are associated with a sub-group of a subscriber line and circuit for coding and decoding are combined into sub-modules such as printed circuit boards which are mounted on a common carrier plate at a spacing from the main portion of the plate so that the carrier plate forms the circuit carrier for the paths and components of the digital portion of the circuits.