交換機可靠度研究與分析

Research & Analysis of Switching System Reliability

戴國村(Kuo-Tsun Tai)

指導教授 ： 張世杰

元智大學/電機通訊學院/通訊工程學系/碩士(2007年)

https://doi.org/10.6838/YZU.2007.00166

摘要

本論文研究之交換機可靠度研究與分析，所探討的可靠度為一般電信機房所使用的大型局用交換機之硬體可靠度，透過交換機硬體可靠度的分析與其在交換機系統所扮演之角色，與對交換機系統的影響進行分析。
過程中運用馬可夫鏈(Markov Chains)模型進行複聯設備的各種模型之機率與可用度及當機時間的演算，且加入台灣常用維修策略之模式的馬可夫鏈模型演算法，此部份在其他資料庫查詢未見有他人用此模式發表，在此用馬可夫鏈模型演算並比較。
另外結合交換機實際維運之性能評估數據，採用傳統的平均運算求得交換機實際維運之可靠度與當機時間並運用滑動平均值演算法(Rolling Average Algorithm)來整理既有收集到的資料求得逆向或順向滑動的平均值之可靠度平均值與當機時間。

關鍵字

交換機 ； 可靠度 ； 硬體可靠度 ； 馬可夫模型 ； 滑動平均值演算法

並列摘要

The main objective of this dissertation is to investigate and analyze switching system reliability in Taiwan, focusing on hardware reliability.
A key finding of this investigation is that many telecom operators in Taiwan utilize a conditional delay repair strategy; namely, under a certain condition, repair activities are postponed until midnight. In order to account for the impact of this delayed repair strategy, a new Markov reliability model has been constructed and solved. This Markov reliability model is then utilized to compare analytical results and actual field data.
Rolling average is a commonly used technique for representing downtime/availability field data. This thesis also extends rolling average to the concept of forward and backward rolling averages and establishes one relationship between these two averages.

並列關鍵字

switching ； Reliability ； Markov Chains Modeling ； rolling average algorithm

參考文獻

[6] George D. Kraft，ｗing N. Toy， Microprogrammed Control and Reliable Design of

[8] C. M. Liu, Y. W. Wang, G. G. Brush and C. M. Hamilton, Bell Communications

Research, Inc. Proposed ISDN Switching System Reliability Objectives for Basic rate Access, IEEE CNF, 2-5 Dec. 1990 Page(s):1084 - 1090 vol.2。

System Reliability - OA&M Considerations, IEEE CNF, 12-15 June 1988 Page(s):1154 - 1161 vol.2。

Failure Analysis (BFA): The Unified FTA-FMEA Methodology。