Monday, June 18, 2007

县域信息化网络规划及组网方案

县域信息化是国家信息化重要组成部分,是推进县域经济发展的重要手段。本论文探讨县域信息化网络规划涉及的技术及组网解决方案。县域信息化网络是县域信息化的基础设施,县域信息化网络是利用宽带IP技术构建的计算机网络,总体上可以划分为核心层、汇聚层和接入层三个层次。统一的IP地址分配、可靠的接入认证及计费管理,完善的网络管理和安全保障均为县域信息化网络规划不可或缺的组成部分。通过对基于SDH、电信级以太网、ATM等多业务平台的组网技术分析,提出LAN、XDSL、WLAN、NGN以及适于农村综合接入的县域信息化网络接入层技术。除提供个人用户接入外,光纤和二、三层VPN技术可实现网络互联,县域商业用户互联也是县域信息化规划重点课题。结合县域教育信息网、县域农村信息网规划建设的实例,对县域信息化网络的深层组网方案予以分析。县域信息化网络在满足现有宽带业务的同时,逐渐向功能融合、架构扁平、控制集中、业务开发灵活的下一代网络演进。

关键词:规划,网络, 组网技术, 县域信息化

Saturday, May 5, 2007

Yahoo perhaps be purchased by Microsoft for Google


Yahoo shares have risen 20 percent after reports pointed to discussions about a possible combination. The Wall Street Journal tells of what appear to be early-stage discussions. It says executives at Microsoft and Yahoo are taking a fresh look at a possible merger of the two companies or some other kind of potential tie-up.

  The discussions were first reported in today's New York Post.

  The New York Post says Microsoft has asked Yahoo to take part in formal negotiations for a possible deal.

  Microsoft is facing tough competition from Yahoo and Google in the Internet search business.
(come from donews.com )