Resiliency to Power Anomalies | Tripp Lite H2552EFL28U, H2550FL16

In the event of a power electronics failure, a service interruption needs to be planned to replace the UPS System.

With power present, a battery system failure will not cause a system interruption. As long as utility power remains present, the UPS System will continue to power the connected IP telephony system without interruption and will continue to condition the power against many power anomalies. In the event of a power outage, the system will crash.

In the event of a battery system failure, the internal batteries of the UPS System and/or the external battery packs can be replaced without a service interruption.

2. Resiliency to Power Anomalies

The fundamental outcome one hopes for in adding UPS System support to a network is to enhance system availability. But an additional concept— resiliency—is very important as well. UPS System resiliency reflects the ability to respond positively to a number of operating variables.

A. Voltage Variation

Currently, one of the most popular UPS System topologies for VoIP is provided by on-line UPS Systems. An on-line UPS System can deliver perfect power even if it encounters a very wide range of input voltages. The on-line UPS does this without relying on its battery reserves, leaving it well prepared to respond to a power outage. Because of its continuous AC-DC-AC conversion process, during an outage an on-line UPS System will also exhibit zero transfer time between power failure detection and power delivery to your equipment. On-line UPS Systems are widely acknowledged to be compatible with all types of VoIP devices.

In many networks with distributed UPS Systems, line-interactive UPS Systems are widely deployed. If input voltage levels are below the line- interactive UPS System's automatic correction capability, the UPS will switch to battery to maintain acceptable output voltage. In areas with chronic extreme brownouts, this frequent switching to battery can reduce reserve power as well as shorten battery service life—putting critical systems at risk in an outage.

While the transfer time of a line-interactive UPS System (several milliseconds) is extremely fast, this short delay has been theorized as the cause of packet losses, or even system shutdown in some applications. Depending on your power environment and the sensitivity of your IP telephony components, a line-interactive UPS System may or may not be

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