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A Methodology for Measurements of Basic Parameters in a xDSL System

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Author

  • Edson Brito Jr.
  • Lamartine Souza
  • Éder Patrício
  • Agostinho Castro
  • Gervásio Cavalcante
  • JWC Costa,
  • Klas Ericson
  • Fredrik Lindqvist
  • Jaume Rius i Riu

Summary, in English

In order to qualify a subscriber loops for xDSL transmission, basic parameters like transfer function, scattering parameter S11 and characteristic impedance should be known. The aim of this paper is to present a test methodology for measurements of these basic parameters. The characteristic impedance is measured by open/short method and it is compared with the terminated measurement method defined in IEC (International Electrotechnical Commission) 611156-1. Transfer function and scattering parameter S11 of DSL loop are also measured on a real cable. The methodology is based on measurements of a 0.4 mm, 10 pairs, balanced twisted-pair cable of 1400 m of length. In order to improve the analysis of results, we compared the measurements from real cable with results from wireline simulators. The measurement of parameters of xDSL copper loop is done in an infrastructure set up in the LABIT (Technological Innovation in Telecommunications Lab) at UFPA (Federal University of Para), that consist of a wireline simulators, a precision impedance analyzer, and a network analyzer. The results show a difference between the measurements performed with real cables and wireline simulators for transfer function parameter. Characteristic impedance obtained by both methods presented quite similar results.

Publishing year

2006

Language

English

Publication/Series

Proceedings of SPIE, the International Society for Optical Engineering

Volume

6390

Document type

Conference paper

Topic

  • Electrical Engineering, Electronic Engineering, Information Engineering

Conference name

SPIE Broadband Access Communication Technologies, 2006

Conference date

2006-10-02 - 2006-10-03

Conference place

Boston, MA, United States

Status

Published