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.

Serialized HDSL multiplexer - demultiplexer protocol

Abstract: A high bit rate digital subscriber line (HDSL) communications scheme employs a serialized multiplexer—demultiplexer protocol, that enables both HDSL channels to be successfully transmitted over an asynchronous, serialized communication link. A service channel supplies control information used by a far end device to extract each HDSL channel from the serialized bit stream. A data channel interface circuit combines a pair of data channel segments of two 784 kbps HDSL channels into a standard 1.544 Mbps T1 serial data stream. The data channel interface circuit contains a register bank which stores embedded operations channel (EOC) information extracted from the two HDSL channels. Auxiliary HDSL signaling information stored in the data channel interface circuit is controllably accessed by a communications control processor for application to an output multiplexer. A framer unit supervises the operation of output multiplexer controllably and injects auxiliary (framing and time alignment) service channel signals to the output multiplexer. The framing structure of the serialized HDSL protocol provides a contiguous sequence of framing bits, HDSL asynchronous channel bits, bit-stuffing majority bits, a stuffing bit, a signaling bit, and 1.544 Mbps T1 payload bits.

Basic Principles of Digital Subscriber Sets

Abstract: The introduction of digital exchanges into the local telephone network in the future will lead to the application of digital subscriber sets, where all speech and signal coding is carried out in the proximity of the telephone. In order to use the two-wire network the problems of digital transmission must be considered together with those of synchronization, signaling, speech conversion, and powering. This paper deals with the basic solutions and shows the concept for a first model of a digital subscriber set.

Transferring voice over an asymmetric digital subscriber line

Abstract: An asymmetrical digital subscriber line (ADSL) system for transferring an analog audio signal and high speed digital data on the side of a subscriber, from and to a station, through one ADSL subscriber line, includes an apparatus on the subscriber side which converts an analog audio signal into a digital audio signal. The apparatus includes a line concentrator to concentrate the audio signal together with high-speed digital data by time division, and supplied to the subscriber line after modulation. An apparatus on the station side simultaneously supplies a signal received from the subscriber side to an analog telephone network, and supplies high-speed digital data to a high-speed digital data network. Each digital audio signal as well as each high-speed digital data is converted into asynchronous transfer mode (ATM) cells in each respective line concentrator, and each destination address is attached to the ATM cells.

Apparatus and method for transmitting voice data on ADSL subscriber Board

Abstract: An apparatus for transmitting voice data on a Next Generation Network Asymmetric Digital Subscriber Line (ADSL) subscriber board and a method thereof enable a Channelized Voice over xDSL (CVoDSL) function as a voice service function of an ADSL subscriber, stable signaling of the CVoDSL, and synchronization of an ADSL subscriber board and a Public Switched Telephone Network (PSTN) to embody the CVoDSL function. The service to the voice subscriber using an ADSL line can be maintained with the same voice quality as that of an existing copper cable subscriber and the same service can be carried out with less expensive equipment. Also, the need for a splitter to provide services using a separate voice band frequency on the ADSL line can be eliminated, and a plurality of users can be provided with voice services by sharing and dividing a service frequency band on the same line.

Method for transmitting information signals in a subscriber terminal network

Abstract: A method for transmitting information signals in a subscriber terminal network wherein the network is between an exchange and the individual subscribers and which is used in the course of the worldwide expansion of the digital telecommunication networks for the transmission of digital signals In order to be able to guarantee optimal transmission rates, measurements of the transmission parameters of the subscriber terminal lines are carried out and, according to the standard provided by these measurements, a maximum bit rate is determined for each subscriber terminal line