Question : Serial ports in Cisco 2801 router

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.  

Answer : Serial ports in Cisco 2801 router

The serial ports are created by the channel-groups.


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controller t1 0/0
 framing esf
 linecode b8zs
 channel-group 0 timeslots 1-24
 
int serial 0/0:0
 ip address 192.168.1.1 255.255.255.252
 no shut
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