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kangfulike无虫 (职业作家)
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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. 谢谢！ |
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kangfulike(金币+20, 翻译EPI+1): ★★★★★最佳答案 谢谢！您太谦虚了。 2012-02-15 15:04:04
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环路测试包括：判定一个环是否能支持DSL服务，并且估计出支持DSL服务所需的转移函数。环路测试是服务提供方在部署DSL服务时最重要的步骤。本文给出了一个更具野心的问题——单端自动环组成鉴定，即，提出了无人工干预的单端测试，用来决定环区域的长度和估量（包括桥式分接头）。环组成鉴定将使操作人员更快地使环达到DSL服务的要求，碧昂起更新和记录电话公司的环记录，这个记录可以用来支持工程建设，物资供应和设备维修。先不提它的潜在重要性，通过单端测试取得环组成鉴定的可能性在以往的文章中很少出现。时间占优反射计（TDR）测量方法的运用，在某novel中被使用最大可能性（ML）算法逐步分析，这里使用该测量方法来加快环组成鉴定。本文提供的算法需要一些准备信息，在本文的第二部分，提供了一个减少鉴定算法的计算时间的方法，另外当环的统计特征在测试前已知的情况也是我们考虑的内容。 能力所限，翻译过程几乎想放弃，但是考虑到助人为乐遂坚持，非专业人员可能不能保证百分之百正确，请后来者勿苛责。 |
2楼2012-02-15 14:10:37
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