UPS
A UPS is an Uninterruptible Power Supply. It’s basically a huge rechargeable battery that provides emergency mains power to keep the most important equipment (the servers) running for a short while during a power cut. They typically do not last any longer than 30 minutes unless you’ve bought a really expensive one.
One response to “UPS”
Copyright
"The Angry Technician" by angrytechnician.wordpress.com is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 2.0 UK: England & Wales License.
Please read my submission policy.
The Angry Technician 
They also generate a really nice smell when the battery cells are burned out. I had to intervene when one Head Teacher was picking up the phone to get the Fire Brigade out.