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Method for testing a communication channel

a communication channel and communication technology, applied in the field of communication channel testing, can solve the problems of low modem transmission rate, high cost and time-consuming, and the inability to troubleshoot customer modem transmission problems by dispatching technicians

Inactive Publication Date: 2011-10-04
AT&T INTPROP I L P
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are numerous other problems, however, unrelated to the physical characteristics of the customer subscriber loop, which can degrade communication performance resulting in lower modem transmission rates.
Troubleshooting customer modem transmission problems by dispatching technicians is expensive and time consuming.

Method used

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  • Method for testing a communication channel
  • Method for testing a communication channel
  • Method for testing a communication channel

Examples

Experimental program
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Embodiment Construction

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[0011]FIG. 1 shows a schematic block diagram illustrating one example of a modem connection between a customer location and a network service provider in accordance with an aspect of the present invention. In this example, the customer location includes a computer system 10 which represents any type of computer system capable of receiving and transferring data. This includes computer systems such as a personal computer or a network server. The computer system 10 is connected to a data modem 12 which may be built into the computer system 10 or exist independently from the computer system 10. Modem 12 is a conventional data modem operating at frequencies below 4000 Hz such as a V.34 or V.90 type modem. The modem 12 is connected to the Central Office switching system 14 by a subscriber loop 16. Each subscriber loop 16 for a particular customer comprises pairs of twisted wires running from the customer location, such as a home or business, to the telephone Central Office switching syst...

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PUM

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Abstract

A method of evaluating the characteristics of a subscriber loop associated with a customer modem comprises the steps of receiving line probing data from the modem and analyzing the line probing data to determine the circuit characteristics of the subscriber loop which relate to communication rate performance. The method generates a gain slope value as a function of the line probing data which is indicative of the length of the subscriber loop. The method also generates a loaded slope value as a function of the line probing data which is indicative of an inductive load on the subscriber loop. The method also generates an A / D value as a function of the line probing data which is indicative of an analog-to-digital and digital-to-analog conversion on the subscriber loop. The method then outputs an expected communication rate for the subscriber loop as a function of the gain slope, loaded slope, and A / D values, thereby providing a circuit analysis of the customer subscriber loop.

Description

[0001]The present application is an application for reissue of U.S. Pat. No. 6,418,160 B1, entitled “Method for Testing a Communication Channel”, which has original U.S. application Ser. No. 09 / 537,830. TECHNICAL FIELD[0002]The present invention relates generally to a method for testing a communication channel and, more particularly, concerns a communication system that uses modern line probing data in an evaluation method to determine the circuit characteristics of a customer subscriber loop.BACKGROUND OF THE INVENTION[0003]Numerous personal computers are connected to other computer systems or to computer networks such as the Internet through the public switched telephone network (PSTN). A common way of connecting a computer to the PSTN for communication with other computers or computer networks is through the use of a modem. Most modems are capable of operating at different transmission rates at different times, and have a typical maximum communication rate of 56 kbps.[0004]Genera...

Claims

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Application Information

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IPC IPC(8): H04B1/38H04B3/30H04M1/24H04L12/26H04M3/30
CPCH04L43/50H04M3/2209H04M3/30
Inventor MILLER, WILLIAM LEE
Owner AT&T INTPROP I L P