论文部分内容阅读
从100多年前公共电话交换网(PSTN)诞生至今,电信就意味着在一个全程网络上提供语音业务.今天,这个网络已经在全世界连接着超过10亿的电话用户.但是渐渐地,文字、图像和动态视像也成了我们这个通信世界的一部分.新的数据网络,如Internet,则开始提供高性价比的附加业务;更为重要的是,这样的数据网正以惊人的速度发展和壮大.急剧膨胀的信息社会要求通信服务能够提供对语音、图像、视像和文字数据的综合传送,这种传送应该在一个单一的电信环境中实现.现今的各种网络必须能够灵活地提供高性能价格比的融合业务.
Since the birth of the public switched telephone network (PSTN) more than 100 years ago, telecommunications has meant providing voice over an entire network that today connects more than 1 billion phone users worldwide, but gradually, text, Image and motion video have also become part of our communications world, and new data networks, such as the Internet, are beginning to offer cost-effective additional services; and more importantly, such networks are growing and expanding at an alarming rate The rapidly expanding information society requires that communications services provide integrated delivery of voice, image, video and text data, which should be implemented in a single telecommunications environment. Today’s networks must be flexible enough to provide high performance Price ratio of the integration business.