UPS: Offline vs Online

In my last lesson, I talked about 10 power quality problems. Today my topic is about equipment to deal with these power problems: generator and UPS. UPS stands for Uninterruptible Power Supply. It is a battery-operated power directly attached to devices and the main power supply. It can provide clean power to the network. There are two types of UPS: Offline UPS and online UPS.
Playlists:
Topology & cabling, & physical cabling structure:
https://www.youtube.com/watch?v=T5xQJ...
Ethernet Basics:
https://www.youtube.com/watch?v=FkH_J...
IPv4 Basics:
   • Tricks to five classes of IPv4  
OSI Model and related:
   • OSI Model