abbr.
Switched Multimegabit Data Service（通过电话网实现）交换式多兆位数据服务；
Switched Multi-megabit Data Service (SMDS) was a connectionless service used to connect LANs, MANs and WANs to exchange data, in early 1990s. In Europe, the service was known as Connectionless Broadband Data Service (CBDS).
以上来源于:Wikipedia
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