高比特率数字用户线（HDSL）是对在现有铜线对上进行高速、短距离通信的重大突破。
HDSL represents a major breakthrough in loop circuits of limited distance, capcable of high speed transmission on copper facilities.
高比特率数字用户线（HDSL）是对在现有铜线对上进行高速、短距离通信的重大突破。
HDSL represents a major breakthrough in loop circuits of limited distance, capcable of high speed transmission on copper facilities.
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