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  • Manual... 
  • PoE+ Gigabit Managed Switch Eco CLI Guide
    CLI Guide for the LPB2810A, LPB2826A, and LPB2848A (Version 1)
 

Black Box Explains...PoE phantom power.

10BASE-T and 100BASE-TX Ethernet use only two pairs of wire in 4-pair CAT5/CAT5e/CAT6 cable, leaving the other two pairs free to transmit power for Power over Ethernet (PoE) applications. However,... more/see it nowGigabit Ethernet or 1000BASE-T uses all four pairs of wires, leaving no pairs free for power. So how can PoE work over Gigabit Ethernet?

The answer is through the use of phantom power—power sent over the same wire pairs used for data. When the same pair is used for both power and data, the power and data transmissions don’t interfere with each other. Because electricity and data function at opposite ends of the frequency spectrum, they can travel over the same cable. Electricity has a low frequency of 60 Hz or less, and data transmissions have frequencies that can range from 10 million to 100 million Hz.

10- and 100-Mbps PoE may also use phantom power. The 802.3af PoE standard for use with 10BASE-T and 100BASE-TX defines two methods of power transmission. In one method, called Alternative A, power and data are sent over the same pair. In the other method, called Alternative B, two wire pairs are used to transmit data, and the remaining two pairs are used for power. That there are two different PoE power-transmission schemes isn’t obvious to the casual user because PoE Powered Devices (PDs) are made to accept power in either format. collapse

  • Manual... 
  • LPB5000 Series Gigabit PoE+ Ethernet Managed Switch Eco User Manual
    User Manual for the LPB5028A and LPB5052A. (Version 1)
 
  • Quick Start Guide... 
  • PoE+ Fast Ethernet Unmanaged Switch (8-Port) QSG
    Quick Start Guide for the LPB308A (Version 1)
 
  • Visio Stencil Drawing... 
  • Visio Stencil
    Stencil Drawings
 

Product Data Sheets (pdf)...PoE PD Switches

  • Video...Power over Ethernet Explained

    There are a lot of misconceptions and myths surrounding Power over Ethernet (PoE). Learn what PoE is—and is not—and clarify how it can be an important part of your network.

  • Firmware... 
  • 48-Port PoE+ Gigabit Managed Switch Eco
    Firmware for the LPB2848A (Version v1.58)
 

Product Data Sheets (pdf)...LPB5000 Series Gigabit PoE+ Ethernet Managed Switch Eco

  • Quick Start Guide... 
  • Hardened Managed Ethernet Switch Quick Start Guide
    Quick Start Guide for the LEH1100 Series (Version 1)
 
Results 11-20 of 39 < 1 2 3 4 > 
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