There are three multiple - access techniques mainly in optical communication , including wdm , tdm and cdma . optical cdma techniques were proposed in mid - 1970s , now , have attracted much attention 在光通信领域,多址技术主要有wdm (波分复用) 、 tdm (时分复用)及ocdma (光码分多址)三种方式。
The paper is arranged as follows : chapter 1 gives a brief description of broadband access techniques , bi - directional hfc network , protocols and standards on hfc network and mhp techniques 本文的安排如下:第一章对宽带综合接入技术、双向有线电视网、协议标准以及家庭多媒体平台的基本概念和发展现状作简要阐述。
The web database access technique is the intercross of internet and intranet , it is the together progress direction , it is not only the research leading edge , and also it has instant want in application now Web数据库访问技术是当今internet技术和数据库技术的交叉点,是二者共同的技术发展方向,不但是值得研究的前沿技术,在目前的应用中也有着迫切的需求。
These access the eis by using various techniques , like ejb - cmp , jdo , dao , and various persistence technologies ; the access technique used depends on interface requirements and the volume of data to be fetched , inserted , or updated 使用不同的技术(比如ejb - cmp 、 jdo 、 dao )和不同的持久性技术访问eis ,所使用的访问技术取决于接口需求以及获取、插入或更新的数据量。
The improvement in cdma2000 about access technique is also talked about in the paper because the traditional is - 95 ' s assessment cannot meet the greatly increased demand for data transmission ( such as short message ) any longer 随着用户数据接入业务(如短消息和彩信)的高速增长,传统is95接入方式越来越不能满足需求, cdma2000中对接入过程的改进是本文探讨的重要内容之一。