电话线路只能以有限的速率传输信息。
Phone lines could only transmit information at a limited rate.
合理选择线路码型有利于提高信号传输速率，减少误码率。
It is good to raise transmissibility of signal to select reasonable line code, and to reduce error code.
由于专用线路能够提供更快的数据传输速率，并且，在Internet访问量大的情况下，专用线路能够节约成本，所以，专用线路越来越多地被企业、甚至个人使用。
Increasingly, leased lines are being used by companies, and even individuals, for Internet access because they afford faster data transfer rates and are cost-effective if the Internet is used heavily.
由于专用线路能够提供更快的数据传输速率，并且，在Internet访问量大的情况下，专用线路能够节约成本，所以，专用线路越来越多地被企业、甚至个人使用。
Increasingly, leased lines are being used by companies, and even individuals, for Internet access because they afford faster data transfer rates and are cost-effective if the Internet is used heavily.
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