DocumentCode :
876402
Title :
Single-ended loop make-up identification-part I: a method of analyzing TDR measurements
Author :
Galli, Stefano ; Kerpez, Kenneth J.
Author_Institution :
Telcordia Technol. Inc., Piscataway, NJ, USA
Volume :
55
Issue :
2
fYear :
2006
fDate :
4/1/2006 12:00:00 AM
Firstpage :
528
Lastpage :
537
Abstract :
Loop qualification consists of determining whether a loop can support digital subscriber line (DSL) services or not, and generally, the estimate of the transfer function is sufficient for such purposes. Loop qualification is one of the most important steps that service providers need to address in deploying DSL technology. In this paper, a solution to a more ambitious problem-single-ended automatic loop make-up identification, i.e., the determination of the length and the gauge of all loop sections (including bridged taps) via single-ended testing without human intervention-is proposed. Loop make-up identification will allow operators to more accurately qualify a loop for DSL service and to update and reorder telephone-company loop records, which can be accessed to support engineering, provisioning, and maintenance operations. Despite its potential importance, the possibility of achieving loop make-up identification via single-ended measurements has seldom been addressed in the literature. The use of time-domain reflectometry (TDR) measurements, which are analyzed by a novel step-by-step maximum-likelihood (ML) algorithm, is proposed here to achieve accurate loop make-up identification. In this paper, the proposed algorithm needs no a priori information, whereas in Part II of this study, a means to reduce the computation time of the identification algorithm will be provided, and the case where a statistical characterization of the loop may be available prior to testing will also be considered.
Keywords :
digital subscriber lines; maximum likelihood detection; telecommunication network topology; time-domain reflectometry; TDR measurement; digital subscriber line service; loop qualification; maximum-likelihood algorithm; single ended testing; single-ended automatic loop make-up identification; telephone-company loop records; time-domain reflectometry; twisted pair modeling; Copper; Crosstalk; DSL; Maximum likelihood estimation; Qualifications; Reflectometry; Reliability engineering; Subscriber loops; Time domain analysis; Transfer functions; Digital subscriber line (DSL); loop qualification; maximum likelihood (ML); time-domain reflectometry (TDR); twisted-pair modeling;
fLanguage :
English
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9456
Type :
jour
DOI :
10.1109/TIM.2006.870134
Filename :
1608598
Link To Document :
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