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The Metro1000 can be configured with both -48V and +24V types of power filter boards. The power filter board POI/POU is located on the right side of the OptiX 155/622H device. There are two power input connectors on the panel of the power filter board, which can simultaneously access two -48V or two +24V power supplies, and the two power supplies are backup for each other. Two -48V (-60V compatible) DC power supplies can be fed in at the same time. The two power supplies share the load during normal times, and the other one can also take up the whole load during faults. There is a ground terminal on the lower right side of the power input connector, which is used to connect to the PGND terminal of the power cord.
This section describes the phenomena, impact on the system, possible causes, tools needed to troubleshoot the problem, precautions, and processing steps when the power supply fails and causes a business interruption.
Phenomenon
A large number of single boards of equipment at a site are reset at the same time, and the service is interrupted.
Impact on the system
A power supply failure can cause service interruption.
Possible Causes
- Cause 1: The power consumption of the network element exceeds the threshold power consumption of the network element.
- Cause 2: Abnormal single board power supply.
- Cause 3: Loose or poor contact of power cord connector.
- Cause 4: External power supply interruption or abnormal power fluctuation.
- Cause 5: Equipment power board failure.
- Cause 6: DC power distribution box failure.
Tools, Instruments and Materials
- T2000
- Multimeter
- Screwdriver
Operation Procedure
- Cause 1: The power consumption of the network element exceeds the threshold power consumption of the network element. If the power consumption of the network element exceeds the power limit for a long time, the power supply board supporting the network element will also work in a high load state for a long time, which will lead to the failure of the power supply board.
- View the current alarms on the T2000.
If ...... then ...... the network element reports the NE_POWER_OVER alarm. Continue to the next step. The network element does not report the NE_POWER_OVER alarm. Go to other reasons.
- See Alarm Reference for handling NE_POWER_OVER alarms.
- Check to see if the service is back to normal, if not, turn to other causes.
- View the current alarms on the T2000.
- Cause 2: The power supply of the single board is abnormal, resulting in service interruption.
- View the current alarms on the T2000.
If ...... then ...... the network element reports the POWER_ABNORMAL alarm. Continue to the next step. The network element did not report the POWER_ABNORMAL alarm. Go to another reason.
- See Alarm Reference for handling POWER_ABNORMAL alarms.
- Check to see if operations are back to normal, if not, turn to other causes.
- View the current alarms on the T2000.
- Cause 3: Loose or poor contact of the power cord connector causes the service to be interrupted.
- Check the connection of the power cord connector that connects the external power supply equipment, the DC distribution box, and the equipment power supply veneer board.
If ...... then ...... the power cord connector is loose or has poor contact. Retighten the power cord connector with a screwdriver or replace the power cord connector and continue to the next step. the power cord connector is tight and making good contact. Turn to other causes.
- Check to see if operations are back to normal, if not, go to other cause.
- Check the connection of the power cord connector that connects the external power supply equipment, the DC distribution box, and the equipment power supply veneer board.
- Cause 4: Interruption of power supply from external power source or abnormal power fluctuation, resulting in business interruption.
- Disconnect the power switch on the DC distribution box, connect the positive pole of the multimeter to the power terminal NEG(-) of the DC distribution box, and connect the negative pole to the power terminal RTN(+). Measure the voltage between power terminals RTN(+) and NEG(-), which should meet the following requirements.
- If the standard voltage of the input power supply is -48V, the power supply voltage should be between -38.4V and -57.6V.
- If the standard voltage of the input power supply is -60V, the power supply voltage should be between -48V and -72V.
If ...... then ...... the voltage between power supply terminals RTN (+) and NEG (-) does not meet the requirements. Continue to the next step. Voltage between power supply terminals RTN(+) and NEG(-) meets requirements. Turn to other causes.
- Contact a power supply engineer for assistance with external power supply troubles.
- Disconnect the power switch on the DC distribution box, connect the positive pole of the multimeter to the power terminal NEG(-) of the DC distribution box, and connect the negative pole to the power terminal RTN(+). Measure the voltage between power terminals RTN(+) and NEG(-), which should meet the following requirements.
- Cause 5: Equipment power board failure resulting in business interruption.
- See Parts Replacement to replace the device power board.
- Check if the business is back to normal, if not, turn to other causes.
- Cause 6: DC distribution box failure, power supply system abnormality causes single board reset.
- Replace the DC power distribution box.
- Check whether the operation is back to normal, if not, turn to other causes.
Reference Information
None.
The technical information in this chapter and the related SDH equipment troubleshooting process are provided by Shenzhen Optical Transmission Network Technology Co.(www.opticaltrans.com), please retain the reprint. Huawei SDH optical transmission equipment, SDH transmission equipment sales phone: 13430988088 Welcome to call!
