... CLEC competitive local-exchange carriers 具有竞争力的本地互换运营商 Gbps gigabit per second 千兆/秒 IAD integrated access device 综合接入装配 ...
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So whilst the "official" definition of 4G talks about one gigabit per second (Gbps) speeds, the marketing departments of mobile operators call 4G anything over 30Mbps or so.
BBC: Viewpoint: What 4G means for you and your phone
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