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DDN（Digital data network）就是数字数据网，是利用数字信道来传输数据信号的数字数据网。
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多选题Which two statements are true about the digital audio in a VoIP network？ （）AStandard encoding techniques create an uncompressed digital data rate of 4000 bps.BStandard encoding techniques create an uncompressed digital data rate of 8000 bps.CStandard encoding techniques create an uncompressed digital data rate of 64，000 bps.DVoice quality is not a concern if compression is not used.ETwo methods of quantization are linear and logarithmic.FTwo methods of compression are u-law and a-law.
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单选题Which benefit does digital subscriber line (DSL) systems for broadband access provide to the user?（）A
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Secure access to company extranetD
Simple solution for high-quality digital video using coaxial cable
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判断题DDN（Digital data network）就是数字数据网，是利用数字信道来传输数据信号的数字数据网。A
对B
错
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