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Single ended line probing in DSL system using transformerless hybrid

A detection signal, a series of technologies, applied in the field of long-distance communication, can solve problems such as reducing the accuracy of loop length estimation

Inactive Publication Date: 2004-11-10
艾卡能通讯公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in existing DSL modem boards, the output resistance of the power supply is not much greater than the line resistance
Therefore, ignoring the line resistance reduces the accuracy of the loop length estimate

Method used

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  • Single ended line probing in DSL system using transformerless hybrid
  • Single ended line probing in DSL system using transformerless hybrid
  • Single ended line probing in DSL system using transformerless hybrid

Examples

Experimental program
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Embodiment Construction

[0022] Description of the SELP device

[0023] figure 2 is a block diagram showing a SELP device 200 (hereinafter also referred to as "modem 200") according to one embodiment of the present invention. Modem 200 generally includes processor 206 , analog front end (AFE) 208 , filters 209 , 211 , line driver 210 , bridge circuit 212 , line transformer 214 , and bypass switches 216 , 218 . Modem 200 may also include other figure 2 Components omitted in (for example, filters and other existing modem blocks). Modem 200 may be one of multiple DSL modems included in a multi-port set (eg, a line card with 48 individual modems and corresponding ports). Alternatively, modem 200 is a stand-alone DSL modem or other SELP device used to measure the length of the transmission medium. In this embodiment, modem 200 is configured at a central office and is operatively connected to the transmission medium via splitter 204 , which is also connected to POTS interface 202 .

[0024] In the re...

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PUM

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Abstract

SELP techniques that provide an accurate estimate of the length of a transmission medium (e.g., subscriber loop in a DSL system) are disclosed. A probe signal is transmitted over the transmission medium at one or more frequencies. A reflected version of the probe signal is then received. Transmission medium impedance is determined based on the ratio of the reflected version of the probe signal and the transmitted probe signal. An estimate of transmission medium length is determined by comparing its impedance to a plurality of predetermined impedances, each of which is associated with a transmission medium having known length. Thus, the length of the systems transmission medium is identified. The transmission medium impedance can also be used to identify the presence of load coils and short circuits in the transmission medium.

Description

[0001] related application [0002] This application is based on the US Provisional Application No. 60 / 303,330 filed on July 5, 2001 and the US Patent Application No. 10 / 115,503 filed on April 2, 2002 as prior applications. technical field [0003] The present invention relates to the field of telecommunications, and in particular to estimating the length of transmission media (eg subscriber loops in DSL systems). Background technique [0004] For high-speed data transmission, copper telephone wires (eg, twisted-pair wires) are used in DSL communications. A major problem for DSL service providers is the precise definition of a customer's local loop (sometimes called a probe line) before deploying DSL service. Typically, line probing involves determining line parameters such as loop capacitance and loop resistance. A typical method for probing a line requires a first telephone handset connected to one end of the telephone line at the telephone company central office (CO) an...

Claims

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Application Information

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IPC IPC(8): H04B3/46H04L12/26H04M3/30H04M11/06
CPCH04L43/50H04M3/305H04M3/30H04B3/46H04L12/2697H04M3/2209H04M11/062
Inventor 法鲁赫·拉希德-法鲁希贾利勒·卡迈利
Owner 艾卡能通讯公司
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