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 and apparatus for synchronization of high-bit-rate digital subscriber line signals

Abstract: Timing information, such as stratum 1 traceable synchronization information, is transmitted in a high-bit-rate digital subscriber line (HDSL) transport frame by timing the transport frame using a corresponding timing reference signal. In an illustrative embodiment, a central office modem maps a DS1 payload at 1.544 Mbps into HDSL transport frames at 1.552 Mbps, using a DS1 timing reference signal generated by, e.g., a building integrated timing supply (BITS) having global positioning system (GPS) capability. The transport frame is transmitted by the central office modem to a customer premises modem which demaps the transport frames to recover the DS1 payload and the DS1 timing reference signal. The recovered timing reference signal is then delivered to an external timing input of a computer, set-top box or other customer premises equipment (CPE). Synchronization status messages (SSMs) may be included in the timing information transmitted between the central office and customer premises modems. The invention is applicable to DSL signals other than HDSL2, including, e.g., single-pair HDSL signals, multiple-pair HDSL signals, as well as other types of signals used in conjunction with the transport of information over existing wired connections.

Multistandard discrete multi-tone (DMT) digital subscriber line (DSL) system

Abstract: A digital subscriber line transmission system using QAM modulation on several equally spaced discrete tones, uses, at a high transmission rate, N=2048/p or 4096/p tones spaced by 4.3125p KHz, where p is a power of 2.

Telemessaging connection network for information transmission

Abstract: In the transmission network, 2048 MBit/s information is transmitted between line connection units (LT) near the subscribers and network connection units (NT) individually assigned to subscribers. The information is transmitted on two pairs (a0,b0;a1,b1) of copper line branches using the HDB3 or HDSL method. The line branch pairs also form a virtual circuit. The a,b branches aT/bT of the terminal branches on the subscriber side and the a,b, branches (aZ/bZ) of the subscriber connection lines on the messaging side for transmission of 64 kBit/s information are connected to the virtual circuit.