Max Supported T1 & T3 on ISRs

[dexter.s.cole]

What is the maximum number of supported T1 interfaces and T3 modules for the ISR's: 1841, 2801, 2811, 2821, 2851, 3825 & 3845?

[ambi]

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

http://www.cisco.com/en/US/products/ps5854/products_qanda_item0900aecd80169bd6.shtml

THe 2800 supports one T3

http://www.cisco.com/en/US/prod/collateral/modules/ps2797/ps4909/product_data_sheet09186a008010fba2.html

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

http://www.cisco.com/en/US/products/ps5855/products_data_sheet0900aecd8016a8e8.html

The 1800 series does not support the T3/E3 module and can take 2x 2port modules in its 2 wan slots