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Troubleshooting SONET

9-133

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.

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