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In a serial WAN interconnection what can be two causes of clocking issues?
Incorrect CSU/DSU configuration.
Exceeding bandwidth.
Delay on the Interface.
Longer cables than usual.
Interface reset.
Per the website named below, "In general, clocking problems in serial WAN interconnections can be attributed to one of the following causes: incorrect DSU/CSU configuration, cables longer than 50 feet (15.24 meters) or unshielded, noisy/poor patch panel connections, or several cables connected in a row." To determine clocking problems, use the "show interfaces serial" command on both routers and examine the output for CRC, framing errors, and aborts. If the error exceeds 0.5 % to 2.0% of traffic on the interface, then clocking problems exist somewhere in the WAN. For more information, refer to: http://www.cisco.com/en/US/docs/internetworking/troubleshooting/guide/tr1915.html
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