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mlnpscda

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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!

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Matt V
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