I know there are earlier posts on this topic, but they don't seem to answer the question. I am monitoring a serial port on a Cisco 2811, which has a T1 line connected. I am getting Transmit Discards, sometimes just a few, and sometimes as high as 3000-4000, I assume this is the total for the 9 minute poll period. The discards do not seem to track with bandwidth use. i.e. sometimes bandwidth will be quite high and Transmit discards will be low and other times the bandwidth use is down at about 400kb and there will be hundreds of discards.