I got 4 new 1841 with a T1 WIC. I have configured the F0/0, S0/0/0 (Frame-Realy), and the sub-int S0/0/0.1 correctly. I would like to know why when I do a show ip interface breif, the S0/0/0 and S0/0/0.1 status come up as Down and the protocol as down. I understand that the protocol would show the protocol as down since I haven't plugged the T1 to the jack.
Also, what does the loopback button on the WIC card do?
Thanks in advance,