can I use WIC-1B-S/T card from old 2600 router in new 2800 router?
I have this problem too.
Correct Answer by Jon Marshall about 8 years 4 weeks ago
I'm afraid not. You need the updated card - WIC-1B-S/T-V3.
Have a look at this link for confirmation -
about 1/3 of the way down there is a table for unsupported WICs.