[j-nsp] EX4300 and full-duplex-only

[Phil Mayers]

Does anyone know the backstory to this? We just found out this platform 
doesn't support half-duplex - at all - and it was an unpleasant 
surprise, as it means some old SCADA and instrumentation can't link-up 
against an EX4300.

I'm assuming they skimped and left out the hardware for detecting RX and 
queueing TX, but wonder if there's something I'm missing.

Cheers,
Phil