Since those devices have many options for interfacing (based on the specs), it seems like a configuration error would be quite possible and more likely than an ethernet cable compatibility issue.
Dude, if these were generic PC, we may be able to walk you through some troubleshooting but these are custom POS for all we know. Shouldn't you be talking to the vendor?
Since those devices have many options for interfacing (based on the specs), it seems like a configuration error would be quite possible and more likely than an ethernet cable compatibility issue.