Select a UPS System which Provides the Highest Availability, Resiliency and Manageability
When selecting a UPS System, the most obvious criterion to consider is whether a UPS System has enough capacity (VA/watts) to power equipment while having enough battery capacity to operate during a power outage for your required duration. Specific Tripp Lite UPS System recommendations are listed at the end of this document. Often overlooked during the selection process, however, are more subtle, yet critical, criteria that should be considered, including availability, resiliency to power anomalies and manageability.
1. Availability
Availability hinges on three considerations: the VoIP equipment's power supply configuration, the UPS System's battery configuration and the UPS System's power electronics topology.
A. VoIP Equipment Power Supply Configuration
Many switches and routers are equipped with redundant power supply capability. If one power supply fails, a second power supply steps in and powers the device. Redundant power supply configurations are strongly recommended to ensure continuous system availability.
Whether one or two power supplies are deployed, the equipment can draw power from one of three sources: directly from facility power alone (for simplicity's sake we will use the term “wall” to describe this source), from a single UPS System or from multiple UPS Systems.
The following tables detail a switch's operational status, from a power perspective, in both redundant and combined
Note: Larger switches often have the capability to be alternatively configured to operate in a combined
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