determining compatibility between cisco parts?

I'm trying to learn a more general concept here, but I'll use a specific example.

We have a location that needs four T1's coming into it.  And there'll probably be a need for more over the next two years.

Cisco makes a card VWIC3-4MFT-T1/E1 that has 4 T1's on it.  How do I determine:

1.  Whether this card will work with:  
     a.  a Cisco 1841 router  (which we have, on hand, right now)
     b.  a Cisco 2811 router  (which we are familiar with, but would have to order)

2.  Assuming the 4 T1 card can be used, how do I determine what limitations on expansion are?  For example, the 2811 has 4 slots in it.  Could I use 4 of the 4-T1 cards for a total of 16 T1's?  (I understand this is not a realworld solution, I'm simply using it as an example).

Please note that I am not asking for the answers to the specific questions.  I'm asking how would  - I-  determine the answers to the questions.  

Is this something I would open a TAC case on?

Thanks!

mlnpscdaAsked:
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Matt VConnect With a Mentor Commented:
From the Cisco product support site you should be able to drill down like this:

 Drill Down
Then choose the WICs for the model you are interested in.  It will give you most of the information you need, questions about maximums per router etc may require a TAC call.
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