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中国电信告别程控交换：全球第一全光网络/全IP组网运营商_China Telecom 中国电信
source link: http://www.cnbeta.com/articles/tech/682141.htm
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12月21日，中国电信最后一个TDM(时分复用)程控交换端局下电退网，标志着中国电信完成了从电路交换向全IP交换的大跨越，成为全球最大的全光网络、全IP组网的运营商。中国电信也特意举办了一个简单的TDM程控交换设备退网仪式，
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