Can poor-quality cable crimping lead to the fact that there will be only 100Mb?

Question

Iron

I pulled a 30-meter cord, quite difficult - along the walls, ceilings ... I will say right away that I don’t really want to overtighten it :) One side is cast, factory. I crimped the other side myself. Everything seemed to work...
I didn't pay attention to the fact that the speed of 100Mb was not immediately noticed. I changed the cord to the factory one (I just threw it on the floor) - gigabit. On the same hardware.
The question is - can poor-quality crimping lead to auto-negotiation only for 100Mb and will re-crimping help correct the situation? It is possible to pull it, but I really don’t want to ...
UPD: There are no power wires nearby. From the word at all. And there is no "nearby" either.

Answer 1

Another option is a cable. If it is copper-plated, and the gasket was complicated, then at the bends some of the cores could burst or become covered with microcracks. This happened to me until I switched to pure copper.
There are also often bad connectors - try re-crimping first :)
ps: ideally, having a tester is not expensive, but it helps a lot :)
pps: take the cable that was cut "on the floor" and re-crimp one end of it - maybe you crimp it a little wrong ? :)

Answer 2

Yes, theoretically possible. When organizing a network over a 100 Mbps channel, 2 pairs of twisted pairs are used and cores 1, 2, 3 and 6 are used. When organizing a gigabit network, 4 pairs are used, i.e. all 8 cores of twisted pair. If you have one core broken somewhere, that's probably why it doesn't work on gigabit. You have to call!)

Answer 3

And for everyone. Multi-core cable in the field does not allow crimping GOST.

Answer 4

far from all connectors are suitable for stranded wires, those with 3 teeth or a plug-in bar are highly desirable.

This is interesting - I still have those connectors, I need to look.

Answer 5

1. Check whether it is correctly crimped and whether all the conductors are visible
2. If one end is cast, then you most likely have a stranded patch cord, and far from all connectors are suitable for stranded wires, those with 3 teeth or a plug-in bar are highly desirable.
3. Pickups from neighboring wires and other factors, at such a distance, ideally, it was necessary to lay down FTP 6 categories.

Answer 6

Many network cards (even cheap on-board chips) have a test mode - this can be used as a more or less decent network tester.
It will show the length, switching of pairs and possibly even a break.