• CN2 GT: http://www.ctamericas.com/products-services/internet/global-ip-transit/
• CN2 GIA: http://www.ctamericas.com/products-services/internet/global-internet-access/
• 普通163线路:http://www.ctamericas.com/products-services/internet/china-access/
• 知乎关于CN2资料:https://www.zhihu.com/question/41896039
• 新浪博客CN2资料: http://blog.sina.com.cn/s/blog_591f0e6e0100aoqy.html