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.

Telecommunication system with a multi-channel digital subscriber line interface and method

Abstract: A telecommunication system having a central office switch connected with a subscriber through an asymmetric digital subscriber line service via a single twisted pair loop with a ATM multi-channel voice interface for converting telephonic voice traffic from additional telephones of the subscriber to a stream of voice data in logical channel associated with the additional telephones and having associated individual telephone directory numbers. The voice data is inserted into high speed data segment of the asymmetric digital subscriber line service on a dynamic basis prior to transmission to the central office switch via the twisted pair from the subscriber and a central office ATM multi-channel voice interface.

Digital Subscriber line (HDSL and ADSL) Capacity

Abstract: The fundamental limits of the outside loop plant to carry high-speed digital (bidirectional HDSL and ADSL) data are reported in this Chapter. This Chapter also focuses on the copper wire-pairs, drop lengths, and interconnects that convey the data over the “last mile” to almost all businesses and residences in the United States. The two major customers, businesses and households are classified, characterized, and categorized by the distance to the Central Office or the remote terminal. Their spectral capabilities are computed and their ultimate digital capabilities are reported. The crosstalk limitations inherent in the plant are also computed and verified against the loss of signal due to distance and spectral constraints. The signal-to-noise ratio can thus be estimated to ascertain the transmission quality through the plant. Accordingly, this Chapter reports losses, bandwidths, and bit rates in the first half, and major bottlenecks and their implication in the second half.

A new channel model for ADSL and VDSL systems

Abstract: This paper presents a new model for telephone lines which is intended for use in simulations of digital subscriber line (DSL) telecommunications systems. It combines the broadband filter characteristics of the line with an improved noise model, which acknowledges the fact that the point of ingress of impulse noise events may be anywhere along the length the line. Since impulse noise is a major impediment to DSL systems, such a model is expected to offer advantages over simpler models. A method for determining the parameters of this model is also proposed.

Radio system forming a wireless subscriber interface

Abstract: A radio system providing a wireless subscriber interface comprising subscriber stations (1, 2, MS) and a network element (4) comprising means for transmitting telecommunication signals between the subscriber stations and a fixed telephone network exchange (3), whereby the system comprises a subscriber station (1, 2) consisting of a radio unit (6) and a fixed telephone network telecommunication terminal (5) connected to the radio unit. In order to route a local call correctly even when the subscriber does not dial an area code, the network element (4) comprises a register (10) including the fixed telephone network area code corresponding to the location (A, B) of the subscriber station (1, 2). In addition, the network element (4) comprises means for retrieving an area code from the register (10) and for adding it as a prefix to the number dial transmitted from the subscriber station (1, 2) in connection with call set-up if the number dial transmitted from the subscriber station (1, 2) does not include an area code.

Circuit for multiplexing/inverse multiplexing data using fifo memories in high-bit-rate digital subscriber line device

Abstract: PURPOSE: A circuit for multiplexing/inverse multiplexing data is provided to use FIFO(First In First Out) memories, which is possessed in an HDSL(High-bit-rate Digital Subscriber Line) device for stable data transmission. CONSTITUTION: A circuit for multiplexing/inverse multiplexing data comprises: an E1 mapping clock generator(300) for generating a clock to map E1 data; FIFO(First-In First-Out) memories(215) for storing the E1 data in a first, a second memory according to time slots in turn, by a write clock; an HDSL(High-bit-rate Digital Subscriber Line) frame controller(400) for making basic HDSL frames by receiving a signal generated from the E1 mapping clock generator(300), for adjusting synchronization between a data terminal and lines, and for supplying a clock to read the data from the FIFO memories(215); a FIFO data input/output confirmer(500) for latching data recorded in the FIFO memories(215) by the control clock, for comparing two values, and for resetting the FIFO memories(215), if the two values are not the same; and an HDSL framer mapper(600) for transmitting E1/2 data outputted from the first, the second memory of the FIFO memories(215) to the lines, by mapping the E1/2 data in the frames made in an HDSL frame(420).