Can I put a interface card : NM-1FE-TX—One-port Fast Ethernet (10/100BaseTX interface) on a 2610XM in order to obtain the second Fast Ethernet port??
According to the following document, this combination is not supported:
You can opt for the NM-1E or NM-4E instead.
Another great help for labs (escpecially routing labs) is GNS3: http://www.gns3.net/
Above I see just another example of a 100% correct answer, made to help, that not being what the OP wanted to hear, has been low rated.
I have rated it again +5 leo!
The OP should learn proper forum behavoir, thanks.
Why are you telling me that is a hardly problem for a lab?
I believe Leo means that for a lab environment, this setup is OK. You still, however, can't use a NM-1FE.
In production, this setup won't really work.