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CAT5E cable auto negotiates 100Mbps, bad cable?


HeyItsChris

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My CAT5E 25 ft cable auto negotiates to 100Mbps & if I force it to 1Gbps full duplex on both machines (it's a direct connection) it cuts out entirely.

 

I already got a refund on the cable but I'd like to know if it's simply a bad cable?  Is there software out there that can test the pair(s) to see if there is a weak link?

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If both machine have the driver and higher than 100mbps ethernet port probably the wire is bad.  I had some old wire that did stuff like that.  Ethernet cable should run a full bandwith without any tweak on windows and linux os.

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Yeah, likely a bad cable. They can go bad fairly easily if not in a static position, such as fixed to a wall or in conduit. If you have them coiled up and used over and over (I do) then they can go bad, especially CAT5 I find but that is because they are so easy to bend back and fourth which will wear at the copper wires inside. Sheilded/Sheathed cable is far hardware to bend, thus preserves the copper more so.  CAT6 S/FTP cables I love, strong, sheilded but not as flexible, though you can still get a good enough radius to go round the corner of a wall, so it is not like it does not move at all, but can be a little more of a fight lol.

 

As @bonami2 has said, assuming there isn't funky drivers issues (Highly unlikely), then you will be fine with a new cable. 

 

You can get cable testers to ensure correct pairing and connection. Google will easily find one "RJ45 Cable Tester" 

 

But I wouldn't invest in one as its likely just a cable which is easier and quicker to replace. 

 

My other advice is to also have spare cables on hand to test if you think you have a bad cable as you can validate that with a spare very quickly. 

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this sounds like a bad cable to me, ive had this plenty in office setups before, especially if a cable has been coiled, or in my case, stored on the 1000FT spool in the spool box for a really long time.

 

and before anyone asks.....i pull cat5e/cat6/cat7 (depending on site requests) in large office building as a side job for $$ in college. ive had spooled cable be bad when testing after a pull before, its annoying but very very possible if its coiled or its being stretched to its limit by someone. if you boguht it off a store or from amazon and its defective, return/refund it and toss it. and one thing ive learned from customers cheaping out MONOPRICE cables tend to be pretty low quality of materials and have the most issues.

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