With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
hdsl2ShdslMaintUnitPowerSource
hdsl2 Shdsl Maint Unit Power Source
1.3.6.1.2.1.10.48.1.9.1.2
This object indicates the DC power source being used by the associated unit.
Back to HDSL2-SHDSL-LINE-MIB MIB page.
IPHost Network monitor allows you to monitor hdsl2ShdslMaintUnitPowerSource on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.