Certified Wireless Network Administrator (CWNA)PW0-105

Chapter 17Power over Ethernet (PoE)

Chapter 17 Overview

• History of PoE• PoE Devices• Planning and Deploying PoE

2Certified Wireless Network Administrator: CWNA – PW0-105

History of PoE

• PoE provides power to devices over Ethernet cables– Commonly used for VoIP desk phones– Used for APs and other network devices– The PSTN uses power over phone lines to

power analog traditional phones

3Certified Wireless Network Administrator: CWNA – PW0-105

PoE Types

• Nonstandard• 802.3af• 802.3-2005, clause 33• 802.3at-2009

4Certified Wireless Network Administrator: CWNA – PW0-105

PoE Devices

• Powered Device (PD)– Draws or consumes power

• Power-Sourcing Equipment (PSE)– Provides power– Endpoint PSE– Midspan PSE

5Certified Wireless Network Administrator: CWNA – PW0-105

PoE Devices (Endpoint PSE)

6Certified Wireless Network Administrator: CWNA – PW0-105

PoE Devices Endpoint (Alternative A)10BaseT and 100BaseTX

7Certified Wireless Network Administrator: CWNA – PW0-105

PoE Devices Endpoint (Alternative A)1000BaseT

8Certified Wireless Network Administrator: CWNA – PW0-105

PoE Devices Endpoint (Alternative B)10BaseT and 100BaseTX

9Certified Wireless Network Administrator: CWNA – PW0-105

PoE Devices Endpoint (Alternative B)1000BaseT

10Certified Wireless Network Administrator: CWNA – PW0-105

PoE Devices Midspan (Alternative A)10BaseT and 100BaseTX

11Certified Wireless Network Administrator: CWNA – PW0-105

PoE Devices Midspan (Alternative A)1000BaseT

12Certified Wireless Network Administrator: CWNA – PW0-105

PoE Devices Midspan (Alternative B)10BaseT and 100BaseTX

13Certified Wireless Network Administrator: CWNA – PW0-105

PoE Devices Midspan (Alternative B)1000BaseT

14Certified Wireless Network Administrator: CWNA – PW0-105

PoE Devices Three PSE Solutions

15Certified Wireless Network Administrator: CWNA – PW0-105

Planning and Deploying PoE

• Power planning– PSE must be capable of providing needed power

• Redundancy– Devices powered by PoE must have failover

options in enterprise deployments

16Certified Wireless Network Administrator: CWNA – PW0-105

Chapter 17 Summary

• History of PoE• PoE Devices• Planning and Deploying PoE

17Certified Wireless Network Administrator: CWNA – PW0-105