Hi, I'm not sure if this exactly matches your issue, but common FCS errors are due to port negotiation mismatch, frame size support and, in the case of the PTP820, surge suppression.
I would double-check that the port negotiation is happening properly on both ends of the cable, that the PTP820S is configured for a high enough frame size (PTP820 supports jumbo frames, but is set to max MTU/MRU size of 2000bytes - you can change from the Ethernet>General page), and that the correct surge supression is being used (more below).
Surge Suppression is recommended when using a lower grade POE or when in a high static environment. This post goes into detail about the specifics of grounding. However, the surge suppressor called out in these posts (C000000L033A Gigabit Surge Suppressor (56V)) should only be used when current is flowing through the cable (i.e. POE). If you are powering direct DC, or using other data ports for just data, no power (i.e. MGMT), a third party surge suppressor (ALPU-F140) is recommended. Using the C000000L033A Gigabit Surge Suppressor (56V) on cables without POE may cause bit errors on the link.
- ALPU-F140.pdf (1.26 MB)
- C000000L033A.pdf (90 KB)