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Improved ADSL compatible discrete multiple audio frequency device

A discrete multi-audio signal technology, applied in the separation device of the transmission path, multi-frequency code system, reducing crosstalk, etc.

Inactive Publication Date: 2002-11-20
AMATI COMM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is generally believed that due to the characteristics of discrete multi-tone technology, this range is impossible to cover

Method used

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  • Improved ADSL compatible discrete multiple audio frequency device
  • Improved ADSL compatible discrete multiple audio frequency device
  • Improved ADSL compatible discrete multiple audio frequency device

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Embodiment Construction

[0022] The now proposed ATIS North American Standard for Unbalanced Digital Subscriber Lines contemplates the use of a discrete multi-tone data transmission mechanism. The elaboration of the Discrete Multi-Tone Transport Mechanism protocol is detailed in the North American Standard in question, referred to as the T1E1.4ATIS standard, and is now set in Standard Draft No. 94-007, rev. 8, dated 1995 March. like figure 1 As shown, the discrete multi-tone system standardized in the North American standard uses 256 "tones" in the forward (downstream) direction, each 4.3123 KHZ wide. The frequency of audio is from 0 to 1.104MHZ. The lower 32 tones can be used to transmit duplex data in the upstream direction. As described in the background section of the application, discrete multi-tone transmission systems have a limitation that is often considered insoluble, which is the inability to guarantee reliable telecommunications service area signal transmission in the presence of T1 noi...

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Abstract

A transmission mechanism that allows for the encoding and modulation of digital data onto discrete multi-tone signals with a total bandwidth of not less than 1.6 MHz. The modulation system dynamically changes the subcarriers used and the amount of data transmitted per subcarrier during transmission (215, 217, 219). In one embodiment, the multi-tone coding and modulation follows the ATIS North American Asymmetric Digital Subscriber Line standard. Also, additional sub-channels (total 512) with sub-channel bandwidth greater than 4.3125 KHz can be used. In this system, those sub-channels with frequencies higher than those set in the standard are treated in the same way according to the sub-carrier selection standard and within the standard range. In addition to allowing digital data to be transmitted over 2000 meters at a rate of 10-50+ MBPS on twisted-pair lines, the system also allows transmission of 1200 meters at a rate of 6-55 MBPS when there is obvious crosstalk noise, such as T1 or E1 (215, 217, 219). Meter.

Description

Background of the Invention [0001] The present invention mainly relates to systems for the transmission and reception of multi-carrier, high-rate data signals, and particularly describes a discrete multi-tone (DMT) system with wide bandwidth. [0002] At the time of this writing, the Alliance for Telecommunications Information Solutions (ATIS), a standards organization delegated by ANSI (American International Organization for Standardization), completed the standard for transmitting digital data over Unbalanced Digital Subscriber Line (ADSL). This standard is primarily intended to transmit video data over ordinary telephone lines, although it can also be used in various other applications. The standard is based on discrete multi-tone transmission systems. The transmission rate is specified so that information can be transmitted at a rate of at least 6 megabits per second (ie, 6+MBPS) over ordinary telephone lines including twisted pair wires. Standardized discrete multi-ton...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00H04B3/32H04B15/00H04J11/00H04L27/26H04M11/00
CPCH04B3/32H04L5/0007H04L5/0046H04B1/06
Inventor J·M·西奥菲
Owner AMATI COMM
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