In pon , the transmission of downlink signal from olt to onu is not complex . usually , the information destined for onus are combined into a multiframe at olt via tdm before reaching the feeder fiber , and then broadcast to each onu via the passive optical demultiplexor . upon receiving the downlink multiframe signal , each onu takes out the part of information for itself only 在无源光网络中， olt到onu的下行信号的传输过程较为简单，一般在olt将需要发送到各onu的信息采用时分复用的方式组成复帧送到馈线光纤，通过无源光分路器以广播的方式发送到每一个onu ， onu收到下行复帧信号后分别取出属于自己的那一部分信息。
We divide traffic into two kinds : real - time and non - real - time , and present a new packet scheduling algorithm . the simulation results show that this algorithm not only provide different qos ( quality of service ) guarantees for real - time traffic ( voice ) and non - real - time traffic ( data ) , but also can assign bandwidth fairly in long term 我们提出一种符合统计时分复用( stdm )概念的分组调度算法，将业务源按实时和非实时分为两种固定优先级，在优先确保语音业务的实时性的情况下，对非实时业务源动态的分配带宽，并通过彷真表明该算法的实用性。
Fiber laser , as a new subject , has been developing rapidly in recent years , especially the short pulse fiber laser . because of its potential application in both optical soliton and optical time division multiplexing communication system in the future , it received more and more attention . in this paper , the author generalizes the latest development of q - switch laser and introduces the common q - switch 近年来,光纤激光器得到了迅猛的发展,特别是短脉冲光纤激光器,由于它在光孤子和光时分复用中的潜在应用,受到越来越多的关注,本文综述了常见的调q开关和光纤调q激光器最新发展情况,作者利用光纤m - z干涉仪作为q开关,实现了激光器的全光纤化,围绕光纤调q激光器进行了激光器调谐、自调q 、主动调q 、光纤激光器的模式结构等方面的研究工作。
W is a digiul trunkin mobile cominunhaon system based on mma forhnology it offers group call diw w m wion ( dmo ) , duplex phone tall , padri data sehece , short data service and so on . tetw supports air interface and end - bend encrypon . tem is not only a fit private system for dispateh cominedcation of the polieq fire servce " w ha wtport , city tiwhc eto , but also for ule project reqthements of the public tw communication system Tetra是一种基于时分复用( tdma )技术的数字集群移动通信系统，它可以提供组呼调度、脱网直通( dmo ) 、企双工电话、分组数据服务、数据短信息服务等业务，支持空中接口加密和端到端加密功能，既适合公安、消防、机场、铁路、城市交通管理等专业部门调度指挥专用，也可满足社会共用集群网的设计要求。
In recent years , fiber lasers have developed rapidly due to the demand of optical fiber communication , especially , the ultra - short pulse fiber laser which has drawn more and more attention because of its potential applications in otdm ( optical time division multiplexing ) technique and optical soliton communication system 近年来,由于光纤通信的发展需要,光纤激光器得到了迅猛的发展,特别是短脉冲光纤激光器,由于在光时分复用( otdm )技术和光孤子通信系统中的潜在应用,更是受到了越来越多的关注。
The alternative solutions to upstream include wdma , tdma , cdma , and csma / cd , among which we adopt tdma at present . in this paper , existing dynamic bandwidth allocation ( dba ) scheme is introduced and a novel dba algorithm over qos is presented , which has fixed cycle , based on the self - similarity character of network traffic 可选方案有波分复用( wdma ) 、时分复用( tdma ) 、码分复用( cdma )和随机接入( csma / cd ) ,综合考虑各方面,目前采用的可行方案是时分复用方式。
