Hello, I have a T1 connection, both ends are using Cisco T1-WIC and using vanilla config on the interface. No link flaps, no log entries... interface stays up. For no obvious reason, the interface hang and no more tcp connectivity on both end, unless I do a shutdown / no shutdown on either of the router's serial interface. Could it be a bad WIC? Patch cord is about 5ft so I don't think it's a distance issue. Please, any input would be appreciated. Regards, Bitoy