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MCB2300 network link check

Hello,

I'm new to ARM-programming and I try to give my best in order to learn by doing. But now it's time for my first question here.
I've got the MCB2300-Board with LPC2387 chip, using microvision 3 and the RT-TCP/IP-Stack.
Now my problem is how to check whether a cable is plugged in or not (without sending packets and waiting to receive ACKs). I took a look into the LPC23xx-manual and found a status register, but that does not seem to help in my case.
Any ideas or hints? :-)