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Understanding Power over Ethernet (PoE) for Network Administrators

This chapter provides an overview of the History of PoE, PoE Devices, Planning and Deploying PoE, types of PoE, PoE devices such as Powered Device (PD) and Power-Sourcing Equipment (PSE). It discusses the different PoE device alternatives and solutions for planning and deploying PoE in enterprise environments.

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Understanding Power over Ethernet (PoE) for Network Administrators

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  1. Certified Wireless Network Administrator (CWNA) PW0-105 Chapter 17 Power over Ethernet (PoE)

  2. Chapter 17 Overview • History of PoE • PoE Devices • Planning and Deploying PoE 2 Certified Wireless Network Administrator: CWNA – PW0-105

  3. 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 3 Certified Wireless Network Administrator: CWNA – PW0-105

  4. PoE Types • Nonstandard • 802.3af • 802.3-2005, clause 33 • 802.3at-2009 4 Certified Wireless Network Administrator: CWNA – PW0-105

  5. PoE Devices • Powered Device (PD) • Draws or consumes power • Power-Sourcing Equipment (PSE) • Provides power • Endpoint PSE • Midspan PSE 5 Certified Wireless Network Administrator: CWNA – PW0-105

  6. PoE Devices (Endpoint PSE) 6 Certified Wireless Network Administrator: CWNA – PW0-105

  7. PoE Devices Endpoint (Alternative A)10BaseT and 100BaseTX 7 Certified Wireless Network Administrator: CWNA – PW0-105

  8. PoE Devices Endpoint (Alternative A)1000BaseT 8 Certified Wireless Network Administrator: CWNA – PW0-105

  9. PoE Devices Endpoint (Alternative B)10BaseT and 100BaseTX 9 Certified Wireless Network Administrator: CWNA – PW0-105

  10. PoE Devices Endpoint (Alternative B)1000BaseT 10 Certified Wireless Network Administrator: CWNA – PW0-105

  11. PoE Devices Midspan (Alternative A)10BaseT and 100BaseTX 11 Certified Wireless Network Administrator: CWNA – PW0-105

  12. PoE Devices Midspan (Alternative A)1000BaseT 12 Certified Wireless Network Administrator: CWNA – PW0-105

  13. PoE Devices Midspan (Alternative B)10BaseT and 100BaseTX 13 Certified Wireless Network Administrator: CWNA – PW0-105

  14. PoE Devices Midspan (Alternative B)1000BaseT 14 Certified Wireless Network Administrator: CWNA – PW0-105

  15. PoE Devices Three PSE Solutions 15 Certified Wireless Network Administrator: CWNA – PW0-105

  16. 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 16 Certified Wireless Network Administrator: CWNA – PW0-105

  17. Chapter 17 Summary • History of PoE • PoE Devices • Planning and Deploying PoE 17 Certified Wireless Network Administrator: CWNA – PW0-105

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