Follow Applicable Industry Standards - Extreme Networks ExtremeSwitching 5420 Series Installation Manual

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Follow Applicable Industry Standards

Calculate Volt-Amperage Requirements

To determine the size of UPS that you need:

1. Locate the voltage and amperage requirements for each piece of equipment.

These numbers are usually found on a sticker on the back or bottom of your

equipment.

2. Multiply the numbers together to get Volt-Amperes (VA):

VA = Volts x Amperes

3. Add the VA from all the pieces of equipment together to find the total VA

requirement.

To determine the minimum volt-amperage requirements for your UPS, add 30% to

the total.

Provide a Suitable UPS Transition Time

UPS transition time is the time required for the UPS to change from providing AC

power derived from the utility (or mains) supply to providing AC power derived from

the battery backup. UPS transition time is sometimes called

UPS transition times vary between UPS models and implementations, but shorter

transition times are preferred. For Extreme Networks stacking products, a UPS

transition time of 20 milliseconds or less ensures optimum performance and minimizes

service interruptions.

For high-availability and fault-tolerant installations in which the switches use

redundant power supply units (PSUs), ensure that each PSU in a switch is connected

to a different UPS and that each UPS is powered by an independent AC supply. This

will prevent service interruptions when a power source is lost, or when a UPS unit

fails. (Note that a single, appropriately sized UPS can power PSUs in multiple switches.

The recommendation is simply that for any given switch, the two PSUs should be

connected to different UPS units.)