2014-01-152014-01-152013-06-20LIMA, Vinicius Duarte. Metodologia para estimação da topologia de linhas telefônicas através da análise de medições em uma e em duas portas. 2013. 98 f. Orientador: Aldebaro Barre4to da Rocha Klautau Júnior; Coorientador: João Crisóstomo Weyl Albuquerque Costa. Tese (Doutorado em Engenharia Elétrica) - Instituto de Tecnologia, Universidade Federal do Pará, Belém, 2013. Disponível em: http://repositorio.ufpa.br/jspui/handle/2011/4602. Acesso em:.https://repositorio.ufpa.br/handle/2011/4602This thesis proposes new methodologies for automatically identifying topologies of lines with one or more sections in a telephone network, which are used in digital subscriber line (DSL) systems. Methods for this purpose are very important for the line qualification in order to install the DSL service, especially when upgrading to more advanced services such as VDSL or adopting vectoring. In order to be useful to service providers in the qualification of a network, usually consisting of millions of lines, it is desired that, as well being accurate, qualification methods should have low computational cost. The proposed methods are based on this observation and perform an analysis of both impulse response and time domain reflectometry trace of a line under test. These two signals are analyzed using a method based on wavelet transform that identifies and extracts features that contain information about the line topology. Depending on the available features, one of three expert systems developed for interpreting information and identifying the topology is used. A thorough comparison with two state-of-art methods is also presented using several twisted pair copper cables. The results show that the proposed methods provide good accuracy with respect to topology identification at lower computational cost with respect to the other evaluated techniques.porAcesso AbertoSistema especialistaIdentificação de topologia de linhaDetecção de bordaLinhas digitais de assinantes (DSL)Line topology identificationExpert systemsEdge detectionDigital subscriber lines (DSL)TeseCNPQ::ENGENHARIAS::ENGENHARIA ELETRICA::TELECOMUNICACOES::SISTEMAS DE TELECOMUNICACOES