I am having problems between 2 sites. The connection is intermittent. My main side is a 7513 with a ds3 card. The interface for the site that is the problem (s1/0/0/24:1) is throwing up input, crc and frame errors. The remote site is a 2500 with an external csu/dsu. I have had the line tested several times by our provider, and they say the line is clean, and they feel that the problem is on the 7513 side.