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Connection switched from 1Gbs to 100Mbs after re-terminating (alien.top)

submitted 11 months ago by ConnectJicama6765@alien.top to c/homenetworking@selfhosted.forum

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Fairy new to the ethernet game, but I just re-terminated one of my cat6 runs from a RJ45 plug to a punch-down keystone jack. My understanding is this is a superior way to terminate pure copper cables, so now I have the patch panels and other gear I've been starting to do that in various places.

Once plugged back in, my switch negotiated the connection to 100Mbs, instead of 1Gbs as previously. This isn't a major problem as I can switch the port to 1Gbs manually, which I have done and which has worked. But it begs the question, have I messed up the punch-down termination? Should I do it again?

I'm interested in some of the detail about how this works here. How does the switch determine what speed to auto-negotiate to? And what kind of physical factors come into play?

Thanks.

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[–] Smorgas47@alien.top 1 points 11 months ago

Best to test it and verify that it does so with other known 1gbps connections. If it always is 100mbps , then reterminate and test again. Most likely one of the wires didn't connect the you are only using 2 of the 4 pairs.

[–] TiggerLAS@alien.top 1 points 11 months ago

10/100Mb network connections use only 2 pairs, the Orange and Green pairs.

1Gb connections need all 4 pairs (8 wires).

If the termination failed, and it resulted in lack of connectivity with one or more wires belonging to the Blue or Brown pairs, then the switch would only negotiate a 100Mb link.

If you're crimping on plastic plugs - I recommend against it. They are prone to failure. Best to punch down to jacks, and then use patch cords from there.

[–] lemmyng 1 points 11 months ago

Gigabit ethernet uses all 8 wires on the cable. If you have no or bad signal on one of them then it would explain the negotiation to 100Mbps. Do you have a cable tester?

[–] Free2Think4Me@alien.top 1 points 11 months ago

You have a problem with the blue and/or brown pair in one or more of your terminations. Even if the wire is properly seated in the groove, look for nicks or breaks in the conductor where you stripped the outer jacket off, or maybe you accidently had the tool reversed when you punched the wire and it's cut on the inside, not the outside, or if you reused an end, check that the original wire didn't leave some of its plastic behind in the groove preventing a proper punch down.

[–] frizzbee30@alien.top 1 points 11 months ago

Bad termination, either in cable alloxation, or to pins.

Re-punch.

You can even get a block fail, yep spent a whole day re-punching, fault tracing (can't justify a fluke or borrow one anymore from work), to find it was the damn socket!