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How to change the dark cable of home network cable

How to replace the dark cable of the home network cable? There are two situations in which the home network cable is hidden. One is that the network cable can not be replaced if it is painted directly on the wall, and the other is that it can be replaced if it is useful. As long as the old line and the new line are firmly connected, then two people slowly pull out the old line, and the other person sends the new line in until it is pulled out.