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HDSL2第二代高速率数字用户线利用1对电话线,双向传输全部或部分 T1/E1 信号
telecom. high-bit-rate digital subscriber line 2
第二代高速率数字用户线利用1对电话线,双向传输全部或部分 T1/E1 信号
telecom. high-bit-rate digital subscriber line 2

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