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内容説明 Power over Ethernet or PoE technology describes a system to pass electrical power safely， along with data， on Ethernet cabling. The IEEE standard for PoE requires category 5 cable or higher for high power levels， but can operate with category 3 cable for low power levels. Power is supplied in common mode over two or more of the differential pairs of wires found in the Ethernet cables and comes from a power supply within a PoE-enabled networking device such as an Ethernet switch or can be injected into a cable run with a midspan power supply.This book is your ultimate resource for 802.3at Power over Ethernet. Here you will find the most up-to-date information， analysis， background and everything you need to know.In easy to read chapters， with extensive references and links to get you to know all there is to know about 802.3at Power over Ethernet right away， covering: Power over Ethernet， Ethernet， 10 Gigabit Ethernet， 10 Gigabit Media Independent Interface， 10/100， 10/100/1000， 100 Gigabit Ethernet， 100BaseVG， 10BASE-FB， 10BASE-FL， 10BASE2， 10BASE5， 10BROAD36， 10 Gigabit Ethernet Alliance， 10PASS-TS， 2BASE-TL， 5-4-3 rule， Apple Attachment Unit Interface， ARP spoofing， ATA over Ethernet， Attachment Unit Interface， Audio over Ethernet， Audio Video Bridging， Autonegotiation， Bridging (networking)， CAM Table， Carrier sense multiple access with collision detection， Channel capture effect， Chipcom， Ciena Optical Multiservice Edge 6500， Connection-oriented Ethernet， Data center bridging， Digital Ethernet Local Network Interconnect， Distributed Multi-Link Trunking， Distributed Split Multi-Link Trunking， Duplex mismatch， Dynamic Trunking Protocol， Energy Efficient Ethernet， EtherChannel， Etherdrive， Ethernet Alliance， Ethernet Automatic Protection Switching， Ethernet Exchange， Ethernet extender， Ethernet flow control， Ethernet frame， Ethernet hub， Ethernet in the first mile， Ethernet Operations， Administration， and Maintenance， Ethernet over coax， Ethernet over PDH， Ethernet over PDH over SONET/SDH， Ethernet over SDH， Ethernet physical layer， Ethernet Private Line， Ethernet Ring Protection Switching， Ethernet Virtual Private Line， EtherType， Exponential backoff， Fast Ethernet， Fibre Channel over Ethernet， General Purpose Serial Interface， Gigabit Ethernet， Gigabit Media Independent Interface， GigE vision， HyperSCSI， Intelligent Resilient Framework， Interframe gap， InterSwitch Trunk， ISCSI， ISCSI Boot Firmware Table， G.8262， Laser bridge， Late collision， LattisNet， Link aggregation， List of deployed WiMAX networks， Local collision， Long Reach Ethernet， MAC flooding， MC LAG， Media Independent Interface， Medium Attachment Unit， Medium dependent interface， Metro Ethernet， Microwave Bypass， Modular connector， Multi-link trunking， Network segment， Network switch， New API， Nintendo GameCube Broadband Adapter and Modem Adapter， Packet switch， Physical Medium Dependent， PME Aggregation Function， Port Aggregation Protocol， Power sourcing equipment， PROFIenergy， Programmable ethernet switching， R-SMLT， RASPPPoE， Reduced Gigabit Media Independent Interface， Reduced Media Independent Interface， Remote collision， Road to 100G， Serial Gigabit Media Independent Interface， Split multi-link trunking， Stackable switch， StarLAN， Synchronous Ethernet， Terabit Ethernet， TIA/EIA-568， Transparent LAN Service， UETS/EFR (Universal Ethernet Telecommunications Service/Ethernet Fabric Routing)， Very High Density Cable Interconnect， Virtual Link Aggregation Control Protocol， Virtual security switch， VLAN Trunking Protocol， Wake-on-LAN， WiBro， WiMAX， XAUI， Xelerated， XSBI， Networking hardware， 110 block， 5526 AMS， AAL1gator， AMD Lance Am7990...and much more.This book explains in-depth the real drivers and workings of 802.3at Power over Ethernet. It reduces the risk of your technology， time and resources investment decisions by enabling you to compare your understanding of 802.3at Power over Ethernet with the objectivity of experienced professionals.