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New Member

Input errors on WIC card

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?

1 ACCEPTED SOLUTION

Accepted Solutions

Re: Input errors on WIC card

Have you cleared the counters and observed whether the above error counters are indeed increasing ??

Once you clear the counters, perform the following test.

Give a local loopback using a hardloop plug and then perform an extended ping on the serial interface with the following data patterns..(Note you will be pinging your own interface ip).

0x0000

0x1111

0xaaaa

0xffff

See if the pings are 100 percent successful.

if the pings are successful and if no errors (input, CRC etc) are appearing on the show interface, then your hardware is good.

If the above tests look good, there is nothing wrong in your hardware, you should go ahead with telco assited loopback testing for futher troubleshooting.

Hope that helps.

3 REPLIES
Silver

Re: Input errors on WIC card

Do you have an internal or external CSU ?

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 .

New Member

Re: Input errors on WIC card

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

Re: Input errors on WIC card

Have you cleared the counters and observed whether the above error counters are indeed increasing ??

Once you clear the counters, perform the following test.

Give a local loopback using a hardloop plug and then perform an extended ping on the serial interface with the following data patterns..(Note you will be pinging your own interface ip).

0x0000

0x1111

0xaaaa

0xffff

See if the pings are 100 percent successful.

if the pings are successful and if no errors (input, CRC etc) are appearing on the show interface, then your hardware is good.

If the above tests look good, there is nothing wrong in your hardware, you should go ahead with telco assited loopback testing for futher troubleshooting.

Hope that helps.

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