I purchased a used 2811 router as a backup to a 2801 with 4 T1 lines. Although the 2811 has 4 t1 lines it does not have the serial port interfaces needed for the T1's. The 2801 has the serial interface but i do not see any other WIC cards. Where are the serial ports located? I can't find any serial ports for a 2800 series that wouldn't have some external connectors.
Are they inside the router? I thought the serial interfaces were included with the T1 WIC cards but that does not seem to be the case.