I have a project where I need to use the ethernet port to link two systems. One system is based on an RCM2250, the other an RCM3309.
The target environment has no network and using a hub/switch is undesirable.
When I connect two RCM3309 systems together directly (one ethernet cable directly from one system to the other), the link appears to come up.
When I connect two RCM2250 systems together directly, the link also appears to come up.
However, when I connect an RCM2250 and RCM3309 system together directly, the link fails to come up (as indicated by the LEDs alongside the ethernet jacks on both modules). If I connect them via a hub, the link comes up fine.
Can anyone shed any light on what is going wrong with the direct RCM2250-RCM3309 ethernet link?
I'm guessing it might be a problem with link speed negotiation, but I can't see any way to either turn on/off auto-negotiation or force the link speed.