Model 994blt portable hydrant backflow preventer is for use in protection of potable water from a fire hydrant or other nonpermanent installation where flow is in one direction only and the possibility of a cross - connection exists 型号994blt移动式消防栓防回流阀适用于保护饮用水系统不会受到消防栓或其他流向只是单向或存在交叉连接可能的临时性安装的应用场合。
Generally speaking , the difference between control and management can be measured . the difference between cross - connection and switching is measured by circuit granularity . likely , the difference between protection conversion of the bottom layer and dynamic routing of the ip layer can be measured 通常控制和管理的区别是有度的,例如交叉连接与交换的区别是用电路颗粒和反应时间来区别的,同样底层的保护倒换和ip层的动态选路之间的差别也有度。
To analyze some key technologies of optical network relative with rwa in detail , such as transmission , switching and internetworking ; to emphasize on the research of function , fabric and performance of optical cross - connection ; to carry out numerical simulations for crosstalk introduced by optical cross connect and to present measurements for suppressing it such as doubly filtering , fixing optimum decision threshold and appropriately choosing the number of multiplexed wavelengths ; 3 . to research the fundamental principle and some problems relative with rwa , including the type of optical network , the type of traffic , the type of service , the survivability of optical network ; to classify and compare rwa algorithms and particularly research some dynamic rwa algorithms ; 4 . to present reserved light - path and classify network resource such as used , unused and reserved status , to emulate establishment of all - optical connection in optical network through modified rwa algorithm and show effectively reducing setup time of all - optical connection utilizing reserved light - path ; to research rwa algorithms of multi - fiber network , to present new link weight functions dependent on node degree , unused fiber ( s ) per wavelength - layer and routing policies , to perform emulation of rwa based wavelength layer graph applying new link weight functions and show them make algorithms better performance and network lower blocking rate ; 5 详细分析了与rwa相关的光网络关键技术,包括传输、交换、组网等,重点研究了光交叉连接的功能和结构、性能,对其引入的串扰进行了详细分析,选择恰当的器件参数进行了数值模拟,并提出了抑制措施(如双重滤波、优化判决门限、选择恰当的复用波长数) ; 3 .研究了光网络的r认叭的基本原理、与r认叭的几个相关问题(光网络类型、业务类型、流量类型、光网络生存性) 、 r认人算法的分类和比较,具体研究了几种动态r场人算法; 4 .研究了以全光连接建立时间为优化目标的r认认算法,提出预置光路的概念,对网络资源进行状态分类(占用、未占用、预置) ,利用改进的r认叭算法仿真,预置光路可为部分新到的连接请求快速建立连接,从而提高网络性能;研究了以多光纤网络连接阻塞率为优化目标的r认城算法,提出了以节点度数、每个波长分层的空闲光纤数以及路由策略决定的几种链路权重函数,利用基于波长分层图模型的并行r场人算法仿真,利用新的链路权重函数使得算法具有更优的性能,使网络具有更低的连接阻塞率。
The tandem switch must first be connected to the transmission equipment providing 2 mbs ports and to the transmission equipment in other tandem area via high - speed ( e . g . 10 gbs ) transmission equipment , and then to digital access and cross - connect system ( dacs ) . it is further connected to the corresponding sdh sub - ring after the vc - 12 level cross - connection carried out by the dacs and finally reaches the end exchange 汇接交换机首先需要连接到提供2mbs端口的传输设备,而后经高速率的传输设备(如10gbs )到达其它汇接区的传输设备上,再接入到交叉连接设备( dacs )上,经dacs进行vc - 12级别的交叉连接,接到各个相应的sdh子环中,最终到达端局交换机。
cross-connection meaning:[Architecture] 1. A connection between two otherwise separate piping systems, one containing potable water and the other water which may be contaminated. 2. In a fire-protection system, a piping conne...cross-connection перевод:матем. перекрёстная [взаимная] связь