My cisco 1841 router does not respond anything to the command 'sho controllers e1'. It shows a 'serial 1T WAN daughter card, WIC-1T' as the result of 'sho diag' command. Recently an E1 link has been terminated on this interface but 'sho int ser0/0/0' shows 1544kbps bandwidth. Moreover, the later command also shows 'total available bandwidth 1148 kbps' as one of the line out of all the lines of the command output. We have ordered this E1 in Hong kong, just in case it has anything to do with location.
find the attachment.
In order to have a T1 controller, you need an internal CSU/DSU.
You have a regular serial card and if you want information from that card, the command show controller s0/0/0 is what you are after.