April 2009
Intermediate to advanced
765 pages
19h 26m
English
book
CWNA®: Certified Wireless Network Administrator Official Study Guide
by David D. Coleman, David A. Westcott
Content preview from CWNA®: Certified Wireless Network Administrator Official Study Guide
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Chapter 17. Power over Ethernet (PoE)
IN THIS CHAPTER, YOU WILL LEARN ABOUT THE FOLLOWING:
History of PoE
Nonstandard PoE
IEEE 802.3af
IEEE Std. 802.3-2005, Clause 33
PoE devices (overview)
Powered device (PD)
Power-sourcing equipment (PSE)
Endpoint PSE
Midspan PSE
Power-sourcing equipment pin assignments
Planning and deploying PoE
Power planning
Redundancy
History of PoE
The concept of providing power from the network dates back to the birth of the telephone, which to this day still receives power from the telephone network. Computer networking devices that are often powered with PoE are desktop Voice over IP (VoIP) phones, cameras, and access points. Ethernet ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.