Unshielded twisted pair This type of cable belongs to category 3, and is not recommended for use in an industrial environment.
非屏蔽双绞线这种电缆属于3类，因此不推荐用于工业环境中使用。
Two types of twisted-pair cable are shielded twisted-pair (STP) and unshielded twisted pair (UTP).
双绞线缆线的二类型是遮蔽双绞线(STP)和无遮蔽双绞线(utp)。
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