Troubleshooting guide

Troubleshooting SONET
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4. Use the information in Table 9-1 to troubleshoot b1-tca, b2-tca, and b3-tca
information that indicates where the data loss may be occurring on a SONET
section, line, or path.
Table 9-1 Data Loss Error Descriptions
Error Description
b1-tca Associated with a specific SONET section. B1 errors indicate a LOS or
LOF condition.
Reports a B1 bit error rate (BER) threshold crossing alarm.
For B1, the bit interleaved parity error report is calculated by comparing
the BIP-8 code with the BIP-8 code extracted from the B1 byte of the
next frame. Differences indicate that section level bit errors have
occurred.
b2-tca Associated with a specific SONET line. B2 errors indicate an L-REI and
L-RDI condition.
Reports a B2 BER threshold crossing alarm.
For B2, the bit interleaved parity error report is calculated by comparing
the BIP-8/24 code with the BIP-8 code extracted from the B2 byte of the
next frame. Differences indicate that line level bit errors have occurred.
b3-tca Associated with a specific SONET path. B3 errors indicate LOP, P-RDI,
and P-REI conditions.
Reports a B3 BER threshold crossing alarm.
For B3, the bit interleaved parity error report is calculated by comparing
the BIP-8 code with the BIP-8 code extracted from the B3 byte of the
next frame. Differences indicate that path level bit errors have occurred.