Thunderbolt to gigabit ethernet problem

On my new Macbook Air (Intel Core i7) I'm trying to connect to my office network using a Thunderbolt to gigabit ethernet adapter, but the network system preferences say that the cable is unplugged. Any suggestions for how I can go about checking what's up?
Many thanks,
Adriaanh

I had this probem also in 10.9.
I was selecting Thunderbolt 1 from the dropdown list of interfaces.
It took a while to realize that Thunderbolt Ethernet is actually the correct option, lower down in the list.
hth,
b.

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