you need it to attach the cable strands into a wall socket
unless the wall socket has screw type connectors and you strip the plastic coating off the cable yourself, however this is a much harder and fiddlier way to do it
punchdown tools are easy to use - put the cable strand into the part where it's meant to go on the wall socket and push down using the tool, connects it in and strips the cable making a good connection
good stuff - they're always handy anyway, and it's a hell of a lot easier making a wall point than it is making the cable using the RJ45 connector itself
and at about £15 - £20 to buy, you might as well hang on to it now you've got it
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