I encounter that I can reach 1000mbps with some combinations of RJ45 outlets and cables, and only 100mbps with other combinations.
- I can reach 1000mbps with all cables (when combined with a given RJ45 outlet)
- I can reach 1000mbps with all outlets (when combined with a given cable)
- I can reach 1000mbps with cables that are longer than the ones I can only reach 100mbps with
So I conclude this is not an issue of
- PC nic
- connection switch <-> RJ-45
- cables alone
- RJ45 outlet alone
- cable lengths
but rather an issue of the combination of some.
|Cable 1||RJ-45 1||1000mbps|
|Cable 2||RJ-45 1||1000mbps|
|Cable 1||RJ-45 2||1000mbps|
|Cable 2||RJ-45 2||100mbps|
This is 100% reproducible.
How can it be that cable 2 + outlet 2 only give 100mbps, while they are individually both capable of getting to 1000mbps?