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I spent ~$35 on new cables and my LAN speed increased 6x
(sh.itjust.works)
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this post was submitted on 09 Aug 2024
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Yep. I'm running 1/1Gbps wan connection over cat5e just fine. Even on very noisy environment at work with a longish run (70+ meters) we ran pretty damn stable 1/1Gbps over good quality cat7.
At work where cable runs are usually made by maintenance people the most common problem is poor termination. They often just crimp a connector instead of using patch panels/sockets and unwind too much of the cable before connector which causes all kinds of problems. With proper termination problems usually go away.
But it can be a ton of other stuff too. Good cable tester is pretty much essential to figure out what's going on. I'm using 1st gen version of Pocketethernet and it's been pretty handy, but there's a ton of those available, just get something a bit better than a simple indicator with blinking leds which can only indicate if the cable isn't completely broken.
Wonder if the cables replaced by OP were user-made, not commercial cables, that were our together incorrectly.
They had been collected from various ISP provided modems and routers I've purchased over the years.
At least in here some of the older modems, specially from ADSL-era, only had two pairs in them, so they were only good up to 100Base-T, which is roughly 7MB/s. So maybe check if that's the case and throw those into recycling bin.