Description of the problem

After Huawei OSN3500 devices are normally powered up, the SSN4GSCC master reports power-abnormal alarm when the voltage and service are normal.

Alarm message

power-abnormal

Processing

Check whether the power supply is -48V or -60V, set the jumper according to the corresponding voltage, if the setting is correct and the alarm exists even if the voltage is normal, please repair the single board.

Root cause

The input voltage range of OSN3500 devices is -38.4 to -72V, and the devices can work normally with the voltage within this range.

But the detection function of the device voltage is on the main control board SSN1SCC. It detects two kinds of specifications, one is -48V, the normal range is -38.4~-57.6V) the other is -60V, the normal range is -48V~-72V.

The two inputs are realized by two jumpers J16 and J17, J16: the first system power supply, J17: the second system power supply; without inserting the jumper: the system uses -60V power supply; inserting the jumper: the system uses -48V power supply.

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