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Multiple Outlets Each SPS will have at least one outlet for connecting computers or network devices to the SPS. Most have multiple outlets. The number of outlets depends on the capacity of the battery, the inverter, and the switching circuit in the SPS.


Line Voltage Indicator This light or indicator, when illuminated, indicates that the SPS is receiving sufficient AC line voltage to power the equipment plugged into the SPS.


Battery Power Indicator This light or indicator, when illuminated, indicates that the equipment plugged into the SPS is running off the battery and inverter in the SPS. When this indicator is initially illuminated, a beep will sound, warning that power to the SPS has failed.


System Management Port This is usually a standard serial port (although USB ports are becoming more popular). It allows the SPS to connect to the host computer (or server) it is protecting. The host computer runs SPS management software that gathers statistics about the power the SPS is using and providing. Also, when a power failure occurs, this port is used to send a signal from the SPS informing the management software on the host computer that the power to the SPS has failed.


The management software can then initiate a graceful shutdown of the workstation computer or server.

Uninterruptible Power Supply (UPS)


An Uninterruptible Power Supply (UPS) is another type of battery backup often found on computers and network devices today. It is similar to an SPS in that it has outlets, a battery, and an inverter. The similarities end there, though. A UPS uses an entirely different method to provide continuous AC voltage to the equipment it supports.

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