Selecting a UPS
To determine UPS requirements for your switch, answer these questions:
- What are the amperage requirements?
 - What is the longest potential time period that the UPS would be
                required to supply backup power?
 - Where will the UPS be installed?
 - What is the maximum transition time that the
                                                  installation will allow? (See Providing a Suitable UPS Transition Time .)
 

Note   
We recommend that you use a UPS that provides online
            protection.