Help w/ WIC-1DSU-T1 in 2621

I have a used WIC-1DSU-T1 that will work in a Cisco 2620 but not a


The WIC works in the following:

Cisco 2620, IOS 12.3(9)

It will NOT work in the following:

Cisco 2621, IOS 12.4(1)

On the 2621, the card is not recognized via sh controllers, sh diag or sh interfaces.

I have verified that the card is seated correctly and it's not recognized in either port.

I've also verified the ports are good, as the 2621 will recognize a standard WIC-1T in either port.

Any ideas? Thanks,


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The WIC-1DSU-TI is end-of-life and may not be supported in 12.4 code.

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