With IPHost Network Monitor you can run simple snmp requests against a Huawei device in your network.
envMonVoltageLowerThreshold
Environment Monitor Voltage Lower Threshold
1.3.6.1.4.1.207.8.4.4.3.10.2.1.6
The minimum acceptable reading of this voltage rail in millivolts.
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IPHost Network monitor allows you to monitor envMonVoltageLowerThreshold on Allied Telesis device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Allied Telesis access points right now.