To help resolve frame slips, configure the external equipment to receive clock from the network. If the external equipment can't accept network clock, configure the circuit line interface for loop clock. If configuring one end of the circuit line for loop clock does not eliminate frame slips, evaluate the clocking architecture of the network and external equipment. Clocking problems typically cause Packet Errors, HEC errors, PLCP errors, or frame-sync errors. The error depends upon the type of trunk interface used.
Errors result from a difference in frequency between adjacent nodes or telco clocking of trunks.
Clock errors on trunks typically occur on one end. This is because the BPX or IGX trunk-card suppresses the input buffer overflow by deleting idle cells. The errors indicate underflow slips. To minimize errors, configure the end of the trunk not experiencing errors for loop clock. A trunk clocked by the carrier may exhibit errors on both ends.