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After analyze the information collected with GTAC, we found that the root cause of the alarms may be is the AUX board, GSCC board or PIU board. With following steps we can determinate which board is the root cause:
1. The external power supply may has the under-voltage problem or fluctuates sharply. So need to measure and confirm the external power supply for this OSN1500 is normal and stable.
If the standard voltage of the input power supply is -48 V, and the measured value should be in the range of -41 V to -60 V;
If the standard voltage of the input power supply is -60 V, and the measured value should be in the range of -51 V to -72 V;
2. If confirm the external power supply is normal and stable, check whether there is any pin bent in slot for AUX board; if no, replace AUX;
3. If AUX board and its slot are normal, check GSCC boards:
(1). plug-out the standby GSCC, 82-GSCC(4-CXL1);[PAY ATTENTION: plug-out this board could cause service affection] check whether POWER_ABNORMAL alarm disappear;
(2). If alarm exist, re-insert 82-GSCC and switch GSCC, then plug-out current standby GSCC, 83-GSCC(5-CXL1); [PAY ATTENTION: plug-out this board could cause service affection] check whether POWER_ABNORMAL alarm disappear;
4. If alarm still exist after plug-out both two GSCCs, check PIU boards: plug-out one PIU, check whether corresponding POWER_ABNORMAL alarm disappear, if yes, replace the PIU; and then plug-out another PIU with same way;
After review the possible causes, we found that the root cause of the alarm was the AUX board, after replace the board the issue was solve.