Question Cat5e cable is only providing a 100Mbps connection.

Jun 18, 2022
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I have Cat6 cabling running around the house, terminating at a 1Gbps network switch and a Cat 6 patch panel. This network does provide a 1Gbps connection to my access point, so I know the issue is not with anything else in the system. However when connecting a Cat5e cable from the port in the wall to my PC, I only get a speed of 100Mbps, I have used a Cat6 cable and gotten 200Mbps - as that is the plan I am on now, anyone know why this Cat5e cable is unable to go above 100Mbps?
 
Could be a wiring issue with the cable and the connected devices just falling back to 10/100 as a sort of fail safe, Thats the only thing I can think of if a different cable works. There really isn't much of a different between cat5e and Cat6 that would cause that, its mostly just windings shielding and cat6 have a thicker copper core.
 
Jul 27, 2022
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A few things can cause this. If your CAT5e and CAT6 cables are longer than 100 meters you will start seeing a drop in performance. If 1 wire out of the 8 is broken it can drop to 100 mbps because 100 mbps only needs 4 wires for that data rate. If the cable wire has an improper configuration (pinout) it can't support the correct frequency, this usually only happens if you're making the cable.
 

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I have Cat6 cabling running around the house, terminating at a 1Gbps network switch and a Cat 6 patch panel. This network does provide a 1Gbps connection to my access point, so I know the issue is not with anything else in the system. However when connecting a Cat5e cable from the port in the wall to my PC, I only get a speed of 100Mbps, I have used a Cat6 cable and gotten 200Mbps - as that is the plan I am on now, anyone know why this Cat5e cable is unable to go above 100Mbps?
That is almost certainly a bad Cat5e cable.

It is "flat"? Those are NOT to spec...the wire gauge is too small.
There are many many fake/crappy cables sold.