Hi,
I have seen similar problems is the past with ethernet auto negotiation.
1. Make sure that your cable runs are less than 100 meters.
2. Make sure that you are using a quality cat 5e or cat 6 cable. Review this document.
3. I suggest that you only use certified wiring technicians.
Try a 10 meter cable that is directly connected to the switch and PC. What the results are for this test?
CISCO switches are the industry leaders and are typically more tolerant for ethernet devices using auto negotiation.
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