With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ciscoEnvMonSupplyState
cisco Environmental Monitor Supply State
1.3.6.1.4.1.9.9.13.1.5.1.3
The current state of the power supply being instrumented.
Back to CISCO-ENVMON-MIB MIB page.
IPHost Network monitor allows you to monitor ciscoEnvMonSupplyState on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.