建立数字视频网络的相关标准

Standards for Building Dieegital Video Network

视讯会议在过去５年增长了３５０％，并预计在未来几年会继续增长３５％。在如此快速增长的情况下，ＭＩＳ管理人员将会投入大量的线路、人力及设备，设法使这一技术更加快速和有效。管理人员将面临的不仅仅是现存的大容量数据信息交换，而且还有不同网络选项上的各种视讯会议、广播视讯、个人视讯及多媒体应用。了解目前及即将制定的标准，不仅对构造一个适当的结构来实现这一新的环境有所帮助，而且对这些增值设备的投资管理也是至关重要的。本文叙述了一些国际标准：Ｈ．３２０，Ｔ．１２０，ＭＰＥＧ—１及ＭＰＥＧ—２和ＪＰＥＧ的特征、优点及不足。

Dataguest claims that videoconferencing grew 350% in the last five years,and industry analysts predict that during the next few years it will have a compound growth rate of 35%. At this rate of growth,information and telecommunications managers will be expected to add and manage quickly and efficiently a large number of lines,people,and equipment. Understanding some of the current and emerging standards is critical in designing the proper structure to implement this new environment and is also essential in managing investment in proliferating equipment. This paper describes features, benifits and the occasional drawback of international standards, H. 320,T. 120, MPEG - 1, MPEG - 2 and JPEG.