What Errors Do Clock Problems Cause?
Clocking problems typically cause frame slips on circuit-line interfaces, especially circuit lines to TDM devices such as a PBX. Frame slips can occur on either or both ends of the line. Both the PBX and the switch can record frame slips. In order to help resolve frame slips, configure the external equipment to receive clock from the network. If the external equipment cannot accept network clock, configure the circuit line interface for loop clock. If the configuration of 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 ove
