I have 3745 series ROUTERS. It is run on c3745-advipservicesk9-mz.123-21.bin ios. I have facing one problem, When i ma terminate my E1 circuit on this port. My port will be in reset status. When i ma put this link on other interface link is working ok and other link put in reset interface then link is working ok. So please tell me what is my probelm?