Hi dhobi,
My gut reaction is it has something to do with an attempted Auto-Negotiation of the link (i.e. 10 or 100, half-duplex or full-duplex). I realize that the default setting from the factory is supposedly 10mbps half-duplex, but I have to wonder if the default setting isn't actually 10mbps half/duplex with auto-neg. If so, then the auto-negotiation is attempting but failing between the OBI and the network device to which it is connected.
Just a theory,
pc44