Before you start swapping out hardware , I would make the Lec loop up the smart jack and sress the line , if the see errors it is theier problem , Also find out if there is an extended demarc.
If the Lec is looping the smartjack and testing clean then have them loop the CSU and see what they get , If clean from the same place they are testing from have them loop the other smart jack. if clean have them loop the other CSU , loops are the best tool for isolating the source of errors in a network .
Carriers have a bad habit of testing from the closest DAX and saying the line is clean , in other words they just test a small portion of the circuit. More ofter than not there is no problem with your hardware , it is either a carrier problem or a misconfiguration on a CSU. either case swapping hardware is not the answer.
You are assuming the errors are counted as packets; they are not. Framing errors and crc errors are bad packets and are not counted as packets. Instead of calc'ing % calc the ratio of good to bad packets.
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