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n Reliability: Look for reliability of the power system including batteries. Irrespective of the technology, if the power system is not engineered correctly or lacks a high degree of reliability, the telecom network can fail.

n Other parameters: In addition to the important electrical parameters like efficiency, power factor, input current harmonics, input voltage window, and EMI specifications, the following characteristics need to be looked at.

High power density leading to compact footprint. Higher the footprint, greater is the money spent on floor space for equipment rooms or shelters.

There are two sets of arguments. One, integrated input and output distribution allows for ease of maintenance and also keeps the footprint low. Two, having input and output distribution separate form UPS helps in maintenance. Because during repair or maintenance of UPS, it is normally transferred to manual bypass to keep the continuity to the critical load and hence it is advisable to isolate UPS completely from any electrical circuit during this repair or maintenance to ensure human safety as well as load safety.

n Buy as You Grow: Easy expandability of modules, shelves, distribution and frames in live condition help to keep the costs commensurate with the stage of growth of the network.

n Digital Controls: Look for digitally controlled modules with digital user interface. This eliminates the need of manual adjustments by trial and error.

n Remote monitoring and remote control: Centralized and remote monitoring systems help in lowering the cost of operation and maintenance or those systems which have that option, so that it is possible to upgrade when the need arises.