On an Option 61C, I'm trying to connect via modem so that I can dial into a switch remotely. I have a serial cable with a db 9 connection terminated to J13 on the switch side and the other end has a db 25 connection termminated to a US Robotics 56K modem. My modem answers, however, I'm unable to communicate with the switch. I get no indications at all that it's trying to communicate...please help!