應用線對節約及多工設備於電話線擴充之策略分析

Abstract

近年來，由於節省線路系統的成本與電纜比較，有很顯著的降低。（節省線路系統即使用用戶戶載波或集線機的技術以降低用戶線路裝設之設備。）而用戶線路的電纜佈放費用所需之人工成本卻大幅的提高，特別是在高的用戶移動性和未確定成長地區。因此，節省線路系統的應用變成線路擴充的重要考慮。本文提出並討論一些數學模式，可作為電話線路擴充之經濟分析。根據線路容量的需求預測，利用這些模式可評估並比較，基於年經費現值以得到最低成本的方案，這些方案包括全電纜，永久性的節省線路系統，或暫時性之節省線路系統之應用。

In recent years, the cost of subscriber pair gain systems, i, e, systems which enable more than one subscriber to be sorved by a single cable pair, has decreased significantly in comparison with cable. Moreover, the operating expenses associated with an all-cable loop network have increased along with the cost of labor, particularly in areas of high customer mobility and uncertain growth. For these reasons, the application of pair gain systems has become and important consideration in loop plant design, This paper presents and discusses a series of mathematical models which can be used in the economic analysis of subscriber pair gain system applications. Given the forc ast requirement for loop facilities, one may use these models to evaluate and compare alternatives for meeting this requirement on a preseent worth' basis. The alternatives may include cable only, pair gain systems only, or a combined cable/pair gain alternative.