One drawback to HDSL is that it takes two circuits.
HDSL的一个缺陷是占用一对电路。
POTS requires a special modulation and conversion schemes with HDSL, unlike other XDSL variations.
与其它的XDSL变型不一样，用HDSL时，POTS需要特殊的调制和转换方案。
HDSL is a new high-speed data transport technology realized over twisted-pair wires and is known as "copper optical fiber."
高比特数字用户环路(HDSL)技术是一种新的在双绞铜线上实现高速数据传输技术，有“铜光纤”之称。
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.
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。
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