I have a 14.4 leased line which I use to connect the central office with my remote site. I have used Codex Modems on both sides and Cisco 2611 and 1601 routers on the central and remote sites respectively. The line has been losing a lot of packets hence inefficient for my purpose. The Telcom company says its my fault but i don't believe them because the configuration on the routers and modems are similar to the rest of my routes and modems and the R232(60,15) cables have been properly tasted. Below are the interface statistics of the serial line of the central site router:
That's a lot of input errors, but from this one output it is impossible to tell if the line is bad. Clear the counters on the interface and run the show interface command again, and see if there are more input errors. Also look at the carrier transitions field.
If you are still receiving errors, run whatever diagnostics you can do between the modem and the router. For instance, can you loop the modem back to the router? If so, see if you get errors. If you do, you have a local problem in either the modem, the router or the cable. If you are not getting errors with that loopback, loop the distant modem back to the line and see if there are errors, if possible. Errors with this test will point to a line problem.
Adding to Marks remarks,i need to tell u if u hve a Bert Meter u can check at u r end by looping the remote end modem.if u get errors on the test then obviosuly the problem of line.the reliability is also too low it shuld be 255/255 for a error free link.
Reliability is calculated using the following formula:
reliability = number of errors / number of total frames
On your interface you have a lot of aborts , this usually indicates a clocking problem , whos is providing clock ? check the CSU's or have the provider check the csu's make sure both sides are not providing clock or are providing clock , only one side or the line should provide clock. , check with the carrier for slips ,
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