Extreme Networks 12800 Series manual DC Power Requirements, Selecting a UPS, UPS Transition Time

Meeting Power Requirements

In addition, some UPS devices or UPS plus software combinations provide the following functions:

●Automatically shut down equipment during long power outages.

●Monitor and log power supply status.

●Display the voltage (current draw) of the equipment.

●Restart equipment after a long power outage.

●Display the voltage currently on the line.

●Provide alarms on certain error conditions.

●Provide short-circuit protection.

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 your installation will allow?

NOTE

Extreme Networks recommends that you use a UPS that provides online protection.

Calculating Volt-Amperage Requirements

To determine the minimum volt-amperage requirements for your UPS:

1Locate the voltage and amperage requirements for each piece of equipment. These numbers are usually located on a sticker on the back or bottom of your equipment. Then multiply the numbers together to get Volt-Amperes (VA):

VA = Volts x Amperes

2Add 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, we recommend that you add 30% to the total.

UPS Transition Time

Transition time is the time that is necessary for the UPS to transfer from utility power to full-load battery power. For Extreme Networks products, a transition time of less than 20 milliseconds is required for optimum performance.

DC Power Requirements

This system should be installed in a DC-I battery return configuration. In a DC-I configuration, the battery return conductor should be connected directly to the central office power return bus, and not to the equipment frame or the grounding means of the equipment.

BlackDiamond 12800 Series Switches Hardware Installation Guide 55