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→Power
Power is provided by two 115 volt, 15 amp, 60 cycle circuits that power two independent APC 1.5 kW rackmount power supplies. Each of the power supplies has a network interface for remote monitoring and control.
The UPSes feed two Raritan Dominion power distribution units (PDUs), mounted vertically up the sides of the cabinet at the back. The PDUs act like long power bars, but have control and monitoring systems so that the per-outlet current consumption can be measured for each outlet and remotely monitored over the network, using snmp or http protocols. Each outlet can also be switched on or off under network control.
Where possible, devices have been configured with dual power supplies. This means that many of the devices in the EHL are plugged into both PDUs and can continue to operate when power is cut to one of the two supplies. This permits the EHL to be rewired without any downtime; it also guards against downtime due to PDU, UPS, or PSU failure.