What sort of stuff does a UPS do? E-mail
A UPS traditionally can perform the following functions: 

  Absorb relatively small power surges. 
  Smooth out noisy power sources. 
  Continue to provide power to equipment during line sags. 
  Provide power for some time after a blackout has occurred. 

In addition, some UPS or UPS/software combinations provide the following functions: 

  Automatic shutdown of equipment during long power outages. 
  Monitoring and logging of the status of the power supply. 
  Display the Voltage/Current draw of the equipment. 
  Restart equipment after a long power outage. 
  Display the voltage currently on the line. 
  Provide alarms on certain error conditions. 
  Provide short circuit protection.
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