共查询到20条相似文献,搜索用时 140 毫秒
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本文介绍了一种反射相控式大功率射频开关的工作原理,这种射频开关不但可以实现主备发射机与天馈线和调机负载之间的切换,还可以实现主备发射机的合成发射,而且所有的切换方式都允许在带功率情况下完成,即系统允许热切换,而无需主备发射机停机。文章还介绍了这种射频开关的几种典型应用。 相似文献
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本文对IP制作系统备份方案进行了探讨,对基带系统的主备、IP时代下的2022-7标准和网关卡净/非净切换的实现方式进行了介绍,对IP系统下的主备、IP系统的优势以及简化进行了分析。 相似文献
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分析广播电视发射机主备机切换器控制要求,简要介绍工控触摸屏设备,利用触摸屏功能,设计制作广播电视发射机主备机切换器的硬件、软件设计思路和方法。设计的切换器能很好地进行主备机智能切换,还能实时采集主备发射机运行数据并上传,长期运行稳定可靠。 相似文献
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This paper considers the case of a standby redundant system where the switchover is not instantaneous. The duration of time between the instant at which action is initiated on the standby subsystem in order to bring it to the active state and the instant at which it becomes operating standby is called switchover time, and is considered to be a random variable. A policy specifying the instant at which action is initiated on the standby subsystem in order to bring it to the operating standby state is proposed and under this proposed policy, the Laplace transform of the probability density function of time to system failure and the expression for expected time to system failure are derived. 相似文献
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This paper deals with a model of a two unit cold standby system with imperfect switch in which the repair man appears and disappears from the system randomly. The standby unit takes random switchover time for operation when the operative unit fails. Failure time of a unit, appearance and disappearance time of the repair man and switchover time of the standby unit are negative exponential, whereas repair time is arbitrary. The system is analysed by using regenerative point technique and several parameters of interest are obtained. 相似文献
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综合接入媒体网关(AMG)位于基于软交换(SoftSwitch)的下一代网络(NGN)的接入层面,其高可用性(HA)直接影响着电信网络的服务质量.文章首先介绍了HA的概念及实现,然后通过对综合AMG的结构及功能的研究,提出了一种实现其HA的方案.在硬件部分,以主备方式的硬件冗余机制来实现硬件容错功能,关键数据及参数的备份均采用温备份方式.在软件部分,提出了实现HA的整体架构以及实现倒换的状态机制. 相似文献
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Inderpal Singh Kochar 《Microelectronics Reliability》1983,23(1):175-178
A systematic method is developed for investment decision on an additional equipment to form a standby or redundant system with a crucial equipment in a production system, considering the cost of repairs, switchover, operation, maintenance and production loss. A method is also proposed to compare these standby and redundant systems. 相似文献
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主备倒换技术是保障机架式通信设备的可运维性关键技术之一。本文提出一种新的高可靠性通信设备主备倒换软件实现方式,并对其关键技术--高可靠性协议进行了深入研究。区别于传统的主备倒换流程,系统在倒换之前,主备控制卡之间进行实时的数据同步,从而将数据同步从倒换的过程中分离开来。经实验验证,本方法既能保证主备倒换的数据的准确性,同时缩短了主备倒换的时间,实现无缝倒换,且适用于机架式通信设备。 相似文献
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This paper studies a two-unit warm standby system subject to slow switch. Failure rates and switchover time of a unit from standby to operative are constant while repair times are arbitrarily distributed. Using the theory of regenerative and Markov-renewal processes several important measures of reliability are obtained. 相似文献
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Expressions for the availability and reliability for a two-unit standby redundant system with non-instantaneous switchover and imperfect repair are obtained. 相似文献
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天线伺服系统是保证卫星通信质量的关键设备,必须确保其高可靠性,双机冗余设计是提高可靠性的一种有效方法。在对系统可靠性进行分析的基础上对传统天线伺服系统进行研究改进,提出热备份切换的双机冗余设计方案。介绍了系统架构、冗余部件、冗余方式选择、互锁切换机制和数据同步方式的设计思想,并对关键技术给出具体的实现方法,具有一定的实用价值。 相似文献
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This paper discusses two models of two-unit standby redundant systems in which the switchover time is a random variable and the repair facility is not available for a random time immediately after each repair completion. In model I the probability distributions of the life time of the online unit and switchover time are general while all the other distributions are exponential. Model II is a cold standby system in which the probability distributions of the “preparation time” of the repair facility is exponential and all the other distributions are general. Using the regeneration point technique the availability functions of the two systems are determined. Several special cases are also discussed. 相似文献