Power over Ethernet: smart power for a greener enterprise


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Power over Ethernet has been used since it's inception to deliver power to devices over Ethernet cables, reducing deployment costs and allowing centralized backup of applications such as VoIP and WLAN. The new IEEE802.3at 2009 standard provides opportunities for IT managers to use PoE as smart (and energy efficient) power distribution system

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Power over Ethernet: smart power for a greener enterprise

  1. 1. PowerDsine MidspansPower over Ethernet: smart power for agreener enterprise Helder Resende Regional Sales Manager, Microsemi Corp.
  2. 2. Agenda About PowerDsine® What is Power over Ethernet? PoE Systems Topologies Use the cable (it’s already there) Managing PoE Systems Deploying Energy Efficient PoE Power Matters.
  3. 3. Power over Ethernet and PowerDsine PowerDsine Established in1995 Patented PoE Technology Leading the Power over Ethernet (PoE) market Designer & Manufacturer of ICs and systems Over 80% Market share of PoE Midspan market Key contributor to the IEEE 802.3af & 802.3at standard definition Heading Power over HDBaseT Technical committee Designed into more than 400 industry-leading switches Acquisition by Microsemi in January, 2007 Over 120M PoE ports shipped since 1999 Key Contributor 3 Power Matters.
  4. 4. What Is Power over Ethernet? Data and Power over a single Ethernet cable Safe and uninterrupted power (up to 60W, 50V) over existing LAN infrastructure IEEE802.3at-2009 and IEEE802.3af-2003 standards Power Matters.
  5. 5. PoE Benefits Cost-Savings • Up to 50% in cost-savings by eliminating the installation of separate electrical wiring and power outlets • Centralized power management for improved energy efficiency and reduced electricity costs Reliability • Continuous operation even in the event of power failure by enabling a centralized UPS to support remote devices Backwards Compatibility • Contains detection mechanism to prevent powering of non-PoE- compliant devices Power Matters.
  6. 6. Where Can You Use PoE? Power Matters.
  7. 7. PoE Systems TopologiesPoE Switch PoE Midspan Replace non-PoE switch  Attach a Midspan to with PoE-enabled switch existing switch Power Matters.
  8. 8. PowerDsine Midspans Value Proposition  Can power terminals with power consumption up to 60W – Future Proof the Network  Upgrade the existing network to PoE without replacing the switch  Improves infrastructure ROI – Longer life cycle compared to switch  The lowest price per port for high power applications  Scalable solution to fit the exact PoE port count  Plug & Play simple installation  Offers power management Data + Power Data only Power Matters.
  9. 9. PoE Deployment for non-PoE Devices  PoE Splitter • PoE In (44V-to-57V) • Splits data and power • Output Voltage 5V,12V,18V, 24V or 37V-57V  Example: Cisco Access Control Data PoE PowerDsine 9501G PowerDsine 951 SplitterCisco Physical Access Gateway Data Cisco Reader 12v Data + Power Module or 24v DC Power 12/24V Cisco Input Module Power Matters. 9
  10. 10. Power over Ethernet Standards IEEE802.3af-2003 2-pairs (PoE) send 15.4W; receive 12.95W ~48VDC IEEE802.3at-2009 2-pairs (PoE+) send 30.0W; receive 25.50W ~54VDC IEEE802.3at-2009 4-pairs (UPoE) send 60.0W; receive 51.00W ~54VDC All power levels are based on worst case voltage, current and cable resistance Standard Standard IEEE 802.3af IEEE 802.3at CLASS PSE (W) CLASS PSE (W) 0 15.4 0 30 or 60 1 2 3 4 4 7 15.4 Treat as 0 1 2 3 4 4 7 15.4 30 or 60 } Type 1 - Type 2 Power Matters.
  11. 11. PoE Functionality Power Source Powered Devices DYNAMIC POWER Are you PoE? Y/N MANAGEMENT Voltage Detection – Power dynamically allocated rather thanCLASS PSE (W) by classification (Example: IP Camera requires 5w, but not 0 30 No power given classified – we only give 5w – everyone else allocates full power) 1 4 2 7 3 15.4 4 30 Power Matters.
  12. 12. Use the Cable (It’s already there) Structured Cable has 4 pairs of wires • CAT5, CAT5e, CA6, CAT6A, CAT7 PoE Powered Devices can take power over: • 2-Pairs 1,2+3,6 or • 2-Pairs 4,5+7,8 or • All 4 pairs 1,2+3,6+4,5+7,8 Who cares? Power Matters.
  13. 13. 4-pairs: Energy Efficient PoE Case Study - Enterprise WLAN, 25.5W, load agnostic PoE System power dissipation • On Power Supply (90% efficient): 0.36W/port • Inside switch: 0.22W/port • On cable: – 3.62W for 2-pairs (12.5Ω cable resistance) – 1.55W for 4-pairs (6.25Ω cable resistance) EEPoE effect on 12-port Midspan: Reduce power by 30W! • With 90% efficient AC/DC power supply Yearly Savings: 30Wx24x365 = 263KWh/year • @ $0.10/KWh = $26/year per 12 WLAN APs! PoE Switch or Midspan Powered Device AC Power Supply PoE IC’s Category 5 Cable DC/DC PoE IC’s110-220VAC Conversion losses 54V losses 54V Resistive Losses >44V Conversion Resistive losses 90% >99% 85% to 97% Losses Power Matters.
  14. 14. Managing PoE Systems Monitoring • Power consumption per Port • Total Power consumption Configuration • Instant Port ON/OFF • Scheduled Port ON/OFF • UPS status Port ON/OFF Interfaces • SNMPv3 – Network Management Suites • Web Management – Via IPv4 or IPv6 • Command Line (CLI) – Secure Shell/Telnet or USB Power Matters.
  15. 15. Power Savings with Scheduling Case Study: Campus with 12 WLAN Access Points • On from 8am-6pm Mon-Fri • Yearly power consumption no scheduling: – 12x27.9W x 24 hours x 365 days = 2,933KWh • Yearly power consumption w/scheduling: – 12x27.9W x 10 hours x 250 days = 837KWh Savings: 2,096KWh/year • @ $0.10/KWh = $210/year per 12 WLAN AP’s! Power Matters.
  16. 16. Effects of Idle Power Consumption PoE Midspans and Switches use Switching Power Supplies (SPS) • Up to 90% efficient at full load – 200W PoE power consumes 220W from AC – 400W PoE power consumes 440W from AC • Have high Switching Power losses at idle – 200W-rated: 20W-40W losses with 0W load – 400W-rate: 40W-80W losses with 0W load Solution: • Small internal power supply (450W) • External power supply when needed (450W to 1KW) Yearly Savings: 45Wx24x365 = 394KWh/year • @ $0.10/KWh = $39/year per 12 WLAN APs! Power Matters.
  17. 17. Deploying Energy Efficiency PoE Use 4-pairs PoE  $26/year savings • Save over 2W per port Use Managed PoE  $210/year savings • Schedule ports to be OFF when not needed Upgradeable supply  $39/year savings • Reducing idle power consumptionTotal energy savings  $275/year savings Power Matters.
  18. 18. PowerDsine Midspans Questions?Helder Resendehresende @ microsemi.com
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