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A timing problem is believed to be causing irregular WAN connectivity. Which of the following is a suggested action to take for solving the problem?
Check the interface card or cable.
Check the status of the line with the "show interfaces serial".
Use the "show interfaces serial" to find input errors.
Check the CSU/DSU configuration.
A timing problem can cause intermittent connectivity on a WAN link. To solve the issue, check the CSU/DSU configuration and verify that clocking settings are fine. A timing problem cannot be caused by a layer 1 failure. A timing problem will not increase input errors it will put the interface status in an up/down state. For more information refer to: http://penta2.ufrgs.br/trouble/trwan.htm
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