With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cpeExtPsePortDeviceDetected
cpe Ext Pse Port Device Detected
1.3.6.1.4.1.9.9.402.1.2.1.3
This object indicates if a Powered Device (PD) has been detected on the interface. A value of 'true' indicates that a PD has been detected on the interface. A value of 'false' indicates that no PD has been detected on the interface.
Back to CISCO-POWER-ETHERNET-EXT-MIB MIB page.
IPHost Network monitor allows you to monitor cpeExtPsePortDeviceDetected 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.