UPS System Battery Configuration | Tripp Lite H2552, H2550FL16

B. UPS System Battery Configuration

UPS System availability, and therefore VoIP system availability, is most critically dependent upon the capacity of the UPS System's battery configuration. The number of UPS System batteries, both internal and external, determines the amount of runtime that is provided during a power outage. As mentioned previously, the runtime must fit the application. Most existing data networks are unlikely to provide reserve runtime power comparable to the public switched phone network. One has to determine a runtime estimate of what is adequate or desirable specifically for a VoIP application. Most users conclude that hours, not minutes, of backup runtime are required to maintain voice operations.

Like any estimate, a runtime estimate will be imperfect and will also be impacted by future capacity requirements (such as the addition of more phones). Therefore, it is critical that the selected UPS System can accommodate external battery packs to increase runtime as needs increase, or maintain runtime in a growing phone environment.

Runtime scalability with external battery packs also yields the ability to hot swap battery packs at the end of their useful life without a service interruption. Similar hot swap battery replacement is also the norm for the UPS System's internal batteries.

C. UPS System Power Electronics

If a UPS System's power electronics fail during a utility power outage, the supported IP telephony system will obviously crash. If the UPS System failure occurs while utility power is present, however, different UPS power electronics topologies can impact IP telephony system availability in different ways.

On-Line UPS System with Internal Bypass

With power present, an internal power electronics fault in an on-line UPS System will result in the load automatically being powered by a bypass path inside the UPS. As long as utility power remains present, the UPS will continue to power the connected IP telephony system without interruption and will continue to condition the power against basic power anomalies. In the event of a power outage, the system will crash.

Upon development of a bypass condition, a service interruption needs to be planned to replace the UPS System.

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