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Terms
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Telecommunications
containing
layer 1
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layer 1
物理层
过去曾称为 level 1
layer 1
OSI 参考模型;CCITT X.25
第一层
layer 1
物理层
layer 1
OSI 参考模型; CCITT X.25
第一层
signaling access protocol
layer 1
-3
信令接人协议第1~3层
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