什么是DAC?
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DAC (即Direct Attach Cable直接连接电缆）高速线缆：固定长度、两端带有固定接头的线缆组件，不可更换接口，模块接头和铜缆不能分离。
DAC高速线缆两端的光器件看似与光模块没有差别，但其实它并不是真正的光模块，因为它没有光学激光器且不带有电子元件，只能传输电信号，无法传输光信号。正因如此，DAC高速线缆比光模块更为便宜，在短距离的应用中能大大节省成本和功耗，是一种低成本、高效益的通信解决方案。DAC高速线缆的优势：
①高性能：适用于数据中心的短距离布线，使用范围广； ②节能环保：高速线缆的内部材料是铜，铜的自然散热效果好，节约能源； ③低功耗：无源线缆的耗电量为0，有源光缆的耗电量通常在440mW； ④低成本：铜缆价格相比光纤的价格要低。DAC高速线缆的劣势：
①传输距离短、重量大、体积大、难以管理； ②容易受到电磁干扰的影响，会出现不良响应、退化等问题
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