The information in de webpage I gave you was the best information that I could find. This exact information can be found in multiple documents on Cisco.com, my guess is that they copy-pasted it in different documents.
It gets a little more difficult as you already did a BER Test, and tried different types of equipment and cabling. The problem is usually in the hardware or the internet connection itself.
There are a few more causes for CRC errors:
Another common cause of CRC errors is noise. Cabling located too close to noise sources such as power panels, heavy machinery, etc., can cause noise. If a cabling installation is particularly faulty (such as pairs being untwisted at the point of termination, improper terminations, field terminated patch cables, and so on). Poorly manufactured components or minimally compliant components that are improperly installed can compound this issue. Cabling segments that are too long can also cause these errors. Try to exclude these causes!
To be honest...all the information I gave you is all I actually know about CRC errors and solving them. I hope this helps to solve your problem!
Regards,
Michaël
