Power Management

Question 1

UPS

Answer 1

• Uninterruptible Power Supply
  
  • Short-term backup power
  • Blackouts, brownouts, surges
• UPS types
  
  • Standby UPS, line-interactive UPS, and on-line UPS

• Features
• Auto shutdown, battery capacity, outlets, phone line
suppression

Question 2

Generators

Answer 2

• Long-term power backup
  
  • Fuel storage required

• Power an entire building
• Some power outlets may be marked as generator-
powered

• It may take a few minutes to get the generator up to
speed
• Use a battery UPS while the generator is starting

Question 3

Dual-power supplies

Answer 3

• Redundancy
  
  • Internal server power supplies
  • External power circuits
• Each power supply can handle 100% of the load
  
  • Would normally run at 50% of the load

• Hot-swappable
• Replace a faulty power supply without powering
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