ATM user network interface ( UNI ) signalling has a OSI layered structure. The paper begins with briefing the architecture of ATM UNI signalling protocols, and the functions of each layer. ATM用户-网络接口(UNI)信令采用OSI的分层结构,本文首先简要介绍了ATMUNI信令协议的体系结构以及各层的功能。
Only begun in 1999, China's high-speed rail network has quickly become the largest in the world, with more than 16,000 kilometres of track in service last year, Zhi said during a briefing. 中国高铁于1999年开始出现,如今,中国的高铁网络已经成为世界第一,去年,中国的高铁里程就达到了16000公里。