Справочник Пользователя для Extreme networks 12800 Series

BlackDiamond 12800 Series Switches Hardware Installation Guide

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. 

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?

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

Locate 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 

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

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. 

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.