What is the maximum number of supported T1 interfaces and T3 modules for the ISR's: 1841, 2801, 2811, 2821, 2851, 3825 & 3845?
Though it is recommended to run 4 x T1/E1's on a 2800 series due to CPU limitations , you can actually install 6x 2port modules
THe 2800 supports one T3
The 3825 supports 14 T1/E1 modules and 1xT3/E3 module while the 3845 supports 24 T1/E1 modules and 2 x T3/E3 modules
The 1800 series does not support the T3/E3 module and can take 2x 2port modules in its 2 wan slots
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