In ICT Networking, the exclusive use of a on-line double conversion UPS (the best technology which provides the highest level of protection), is not always sufficient to guarantee the availability required by the application and correct business continuity.

The concept of High Availability is determined by the statistic quantifying the probability of downtimes, and presupposes the existence of one or more redundant solutions within the system, each capable of performing the same function within the system.

There are various solutions for achieving the highest level of availability, and they depend, among other factors, on the configuration of the electrical installation and the type of UPS systems used.

Below, we describe 3 High Availability solutions which are suitable for ICT Networking:

• Automatic Transfer Systems (ATS);
• Parallel redundant configuration (1+1);

• Remote monitoring systems operating 24/7/365.

1) Automatic transfer systems (ATS)

If the priority power source is out of tolerance or unavailable due to  scheduled maintenance, the ATS automatically transfers the critical load to the alternative source.

2) Redundant parallel configuration (1+1) 

In any fault situation, the additional UPS module provides sufficient capacity to supply the load while maintaining on-line double conversion protection.

Parallel technology is based on the principle of load sharing, whereby both units are always kept active.

A 1+1 redundant configuration does not require additional circuits and can therefore be set up at a later date, simply by using two UPS modules and a collector and/or manual bypass, which simplifies the wiring and maintenance of the UPS system.

3) Remote monitoring system operating 24/7/365

In the event of incorrect operation of the UPS, a remote monitoring system operating 24/7/365 sends an alert in real time by e-mail or SMS, thus enabling prompt action to be taken to solve the problem.

The system is also capable of sending information about the energy availability of critical electrical installations, in the form of periodic reports. The reports ensure correct updating of the installation’s events history, thus enabling the supplier’s technical personnel to carry out remote maintenance on the UPS.

High Availability solutions are strongly recommended for mission critical loads such as servers and central network devices, whose availability is essential to the assurance of business continuity.

Tech Info – April  2010

HIGH AVAILABILITY IN ICT NETWORKING

by

MATTEO GRANZIERO

Technical Communication Specialist

SOCOMEC UPS