The link does not start.
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CSU
biopolar violations (CSU BPVs) can be the cause. One end of the link is set
up for AMI lines. The other end is set up for ESF bit 8 zero substitute (B8Zs).
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If you are in the United States
or Canada, you can directly fix this problem from the menu of the CSU/DSU.
Check the CSU/DSU manufacturer's documentation for details.
In other locales, the provider might be responsible for fixing CSU BPVs.
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The link has poor performance.
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The pppd debug output shows CRC errors when sustained traffic
is on the link. Your line might have a clocking problem, caused by misconfigurations
between the telephone company and your network.
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Contact the telephone company to ensure that “loop clocking”
is in use.
On some unstructured leased lines, you might have to
supply clocking. North American users should use loop clocking.
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