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Huawei performed the following operations to diagnose the fault:
Collected onsite information and found that the working voltage of ccc2/10 dropped 1 minute before ccc2/10's heartbeat loss.
aug 27 2010 21:45:31 r1-c-xpf-ne5000e %%01srm/1/volbelowfatalfail(l):slotid ccc2/10, address64, channel1 voltage below fatal threshold, voltage is 0.00v.
aug 27 2010 21:45:31 r1-c-xpf-ne5000e %%01srm/1/volbelowfatalfail(l):slotid ccc2/10, address64, channel0 voltage below fatal threshold, voltage is 0.00v.
aug 27 2010 21:45:31 r1-c-xpf-ne5000e %%01srm/1/volbelowfatalfail(l):slotid ccc2/10, address64, channel11 voltage below fatal threshold, voltage is 0.19v.
The power supply was unstable. The voltage drop caused power-off of the standby MPU ccc2/10. The active MPU ccc2/9 proactively initiated a heartbeat check. If the standby MPU ccc2/10 did not respond within 1 minute, it was reset.
Then, the system attempts several times to power on ccc2/10 again.
aug 27 2010 21:51:48 r1-c-xpf-ne5000e %%01srm/3/pwronfinish(l):slotidccc2/10, board power-on finish!
aug 27 2010 21:51:48 r1-c-xpf-ne5000e %%01srm/3/mbusreg(l):slotidccc2/10, monitorbus node register!
However, ccc2/10 failed to power on and therefore failed to register.
There is voltage monitoring and power-on control logic on an MPU. When a voltage on the MPU drops to a value less than the lower threshold of the normal working voltage, the voltage monitoring logic powers off the MPU. In this issue, a voltage on ccc2/10 dropped abnormally. As a result, ccc2/10 was powered off and reset due to heartbeat loss.
When the system attempted to power on ccc2/10 again, the power-on control logic checked voltages and found that a voltage was out of the normal working voltage. Therefore, ccc2/10 failed to power on and register.
This issue occurred only on a few boards.The faulty needed to be returned to Huawei headquarters for locating the faulty chip.