Estimation of DSL telephone loop capability using CAZAC...

Details Estimation of DSL telephone loop capability using CAZAC... Estimation of DSL telephone loop capability using CAZAC...

2006-07-04

2006-07-04

Harold, Jefferey F. (Department: 2646)

Telephonic communications

Line equalization or impedance matching

C379S399010, C379S394000

Reexamination Certificate

active

07072462

ABSTRACT:
A system for determining whether a telephone loop is capable of carrying a Digital Subscriber Line (DSL) signal. A Constant Amplitude Zero Auto Correlation (CAZAC) sequence signal is generated and transmitted through the loop plant to a central office and the received echo signal is processed using second-order statistics. The second-order statistics calculation permits determination of the echo signal amplitude and time between the echo signal and sequence signal. The echo signal amplitude and time may be used to obtain telephone loop characteristics such as loop length.

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Rentko, Bobbi. “Telcordia DSL Loop Qualification Service (DLQS) for ISP Market—Qualifying end-users transparently for DSL service—White Paper”. pp. 1-5. Copyright 2002, Telcordia Technologies, Inc.
Telcordia™ DSL Loop Qualification Service (formerly Sapphyre). Printed from www.telcordia.com, Feb. 3, 2003.

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