CompTIA Server+ (SK0-005)Server Hardware Installation and ManagementHard
A data center is experiencing intermittent power outages, some lasting several minutes, and frequent voltage fluctuations. The server administrator needs to ensure continuous power to critical servers and protect them from power quality issues, including sags, surges, and complete blackouts. Which type of power protection device provides the most comprehensive protection for this scenario?
- AOnline UPS (Double-Conversion)
- BLine-Interactive UPS
- CStandby UPS (Offline)
- DSurge Protector
Show answer & explanationAnswer & explanation
Correct answer: A. Online UPS (Double-Conversion)
An Online (Double-Conversion) UPS provides continuous, clean power by converting incoming AC to DC to charge the battery, then converting DC back to AC for the output. This isolates the load from all power fluctuations and outages, offering the highest level of protection.
Why the other options are wrong
- B. A Line-Interactive UPS offers some voltage regulation (sags/surges) but still switches to battery during a full blackout, introducing a small transfer time and not providing continuous clean power.
- C. A Standby (Offline) UPS only activates the battery during a blackout, offering no protection against sags, surges, or brownouts.
- D. A surge protector only protects against voltage spikes; it offers no protection against sags, brownouts, or blackouts.
Online UPS (Double-Conversion UPS)
A type of Uninterruptible Power Supply (UPS) that continuously converts incoming AC power to DC to charge its battery, then converts it back to AC power for the connected devices. This provides continuous, clean power and isolates the load from all input power fluctuations.
- Provides continuous, clean power (zero transfer time).
- Protects against all nine common power problems.
- Most expensive UPS type.
- Ideal for critical servers and sensitive equipment.
Memory trick: Online UPS: Always On, Always Perfect Power.