VeEX MPA User Manual page 378

MPA_e_manual_D07-00-129P_RevA00
What causes an AIS alarm?
What causes an RDI alarm?
How to Insert Errors
How to Insert Alarms
What Causes a B3 Error?
The B3 byte of the Path Overhead is used to detect parity errors at the Path layer of the
incoming SONET signal. A B3 error is also known as a Path Code Violation (CV-P).
B3 errors are only reported by SONET equipment at each end of a SONET path. This
broad reporting means that an error may exist anywhere in the SONET path. The
causes of a B3 error are similar to those attributed to B1 and B2 errors (faulty transmit
and receive equipment, a low receive signal, or dirty fibers) with the additional element
of faulty Path Terminating Equipment.
The first step in troubleshooting a B3 error is to look for B1 or B2 errors along the
SONET path. If these errors exist, then there may be a problem with fibers or the
transmit or receive equipment along the SONET path. If these errors are not present,
then there may be a problem with the Path Terminating Equipment.
Related Topics:
Unit reports Loss of Signal (LOS)
What causes a B1 error?
What causes a B2 error?
What causes a B3 error?
What causes an AIS alarm?
What causes an RDI alarm?
How to Insert Errors
How to Insert Alarms
SONET Tab
378