One of our routers is receiving many input errors on the serial interface. The card is a 56/64K 4-Wire CSU/DSU. Out of 40000 packets input, there are 810 inpute errors, 294 CRC, 227 Frame and 289 abort errors. Does this indicate a bad card or is the problem someplace else? We are also having problems with this circuit dropping unexpectedly and the provider says its our hardware. Yet, we have replaced both the router and the card. Any thoughts?
What does the other side look like any errors , What kind of CSU is attached there internal /external ?
Is there an extended demarc ?
The best this for you to do is be on the line with the carrier so you can work with them providing loops , If you see DCD dropping it is a carrier problem , Find out from the carrier where they are trsting from , They have a bad habit of testing from the closest DAX to the site and run a test for five minutes and declare it clean . Make them test the circuit in both directions from the same test point.
Another thing you can do is have the carrier put up a monitor on the circuit for a day or so then have them check the stats , this is a good way of identifying errors that are bursty not a steady stream of errors
If you have an internal CSU do a sh service-module serial x performance stats , this will show you all the time period for the last 24 hrs and when the errors occured .
You need to take this up with your provider.Take a loop from him,first clear the counters on the interface and see if u see errors increasing.If your circuit is dropping, then carrier transitions will increase.Also need to check the other side of the circuit for the same
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