Cisco 3640 router disables any module inserted in slot 3
I have a Cisco 3640 router that I have been preparing for a new location. In testing, I noticed that any module I put in 'Slot 3' is seen but not put in a disabled state. I have swapped modules from other slots that are working to ensure that I didn't just have a bad module. I am wondering if this is an IOS limitation that you need an ENTERPRISE IOS version to resolve or possibly just a bad Slot in the router. Can anyone clarify this for me?
Also, the current IOS version is 12.2(11)T8 if that matters.
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