Hi Owain,I would definitely check the rating on the patch lead; I've had the same thing (1000BaseTX renegotiating to 100BaseTX) when using Cat5 instead of Cat5e or Cat6 cable.
I'd found that Cat5 was stable on a short run and thought "Cat5 - supports Gig Ethernet, lovely" only to come a cropper when I moved the computer 3 feet further from the switch, with a longer Cat5 lead :-) Eventually, after crawling all over my system and trying different cards etc, I twigged and swapped in a Cat5e lead. Magic!
Cheers Brad On 20/07/2025 11:39, rmluglist2--- via Hampshire wrote:
Thanks folks - a few things for me to check there. -----Original Message----- From: Hampshire <[email protected]> On Behalf Of Nick Chalk via Hampshire Sent: 20 July 2025 11:20 To: Hampshire LUG Discussion List <[email protected]> Cc: Nick Chalk <[email protected]> Subject: Re: [Hampshire] Networking hardware advice On Sunday, 20 July, 2025, I wrote:It sounds like there's a borderline out-of-spec cable in that run. One or more of the switches is renegotiating to 100BaseTx from a higher speed.I should have added: Next time it happens, check the link speed lights on each switch from the affected machine to the fibre router. That should show whether one link has renegotiated. Nick. -- Nick Chalk ................. once a Radio Designer Confidence is failing to understand the problem.
-- Brad Macpherson
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