synchronous optical network
... 软交换 Softswitch 同步光缆网 Synchronous optical network 短消息服务 Short Message Service ...
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设备供应商称，广域以太网的成本只有同步光缆网的五分之一或者A TM的十分之一。
Equipment vendors are saying Ethernet in the wide area may have as little as one-fifth the cost of SONET and one-tenth the cost of ATM.
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