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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