超七类屏蔽网线對水晶頭的要求
以往的五類、超五類和六類佈線中，採用的RJ型接口，而在七類佈線系統中，將允許“非-RJ型”的接口。
如ARJ-45會在RJ-45的基础上增加4个连接触点，ARJ-45接口为1,2,3,4,5,6,7,8这8个触点工作，最高传输为2000MHZ。
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Between STP and UTP, in addition to the shield layer, STP has a ground drain wire, which is used to STP to ground to prevent electrostatic interference from long-distance transmission and cause packet errors.
Requirement for crystal head of CAT7
RJ-type interfaces were used in CAT5, CAT5e, andCAT6, while in CAT7, "non-RJ-type" interfaces will be allowed.
For example, ARJ-45 will add 4 connection contacts on the basis of RJ-45. The ARJ-45 interface works with 8 contacts of 1,2,3,4,5,6,7,8, and the maximum transmission is 2000MHZ.
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