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SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE.
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adequate. Generally, line-interactive UPS Systems do not pose a problem.
This is the subject of some debate and is generally presented as a major
issue by vendors biased towards selling online UPS Systems.
Line-interactive UPS Systems do tend to cost less than on-line UPS
Systems and operate with higher efficiency, reducing electrical costs.
In theory, an on-line UPS System battery should be used less frequently
due to input voltage variation, and will therefore last longer. This advantage
will manifest itself more as the frequency of input voltage variation
increases.
B. Harmonic Distortion
Only an on-line UPS System will address input harmonic distortion.
Because an on-line UPS System deconstructs and reconstructs the input
power, it can deliver distortion-free power. A line-interactive UPS System
will pass through input waveform distortions. Harmonic distortion tends to
be an elusive “gremlin” issue when it affects connected loads.
C. Transient Spikes (or “Surges”)
Both line-interactive and on-line UPS Systems address sudden increases in
voltage.
D. Electromagnetic Interference
While both line-interactive and on-line UPS Systems address these
phenomena, an on-line UPS typically offers far superior filtering capability.
3. Manageability
VoIP system availability is closely tied to UPS System manageability. To
ensure continuous availability, UPS Systems must be incorporated as an
integral part of a sound hardware management scheme. UPS Systems are
extremely manageable and responsive, communicating their status
automatically and triggering application shutdowns prior to battery
exhaustion in the event of a power outage or extreme voltage variation.
There are various methods to communicate with UPS systems, including
SNMP, Web, network software and direct connection. While most users
choose SNMP/Web accessory cards installed inside UPS Systems for
communication, the most essential requirement is to deploy and use some
method of communication. Without a management application running for
your UPS Systems, the day will come when the UPS batteries fail and your
system fails as your power fails. Simple management steps taken at
installation can save significant problems later.