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  • Manual... 
  • LGH1000 Series Hardened Ethernet Switch User Manual
    User Manual for the LGH1004A (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... 
  • Gigabit Ethernet Managed Switch CLI Guide
    CLI Guide for the LGB5028A and LGB5052A (Version 1)
 
  • Firmware... 
  • 48-Port Gigabit Managed Switch Firmware
    Firmware for the LGB1148A (Version v2.00)
 

Product Data Sheets (pdf)...Hardened Mini Industrial Switches

  • Quick Start Guide... 
  • Gigabit Ethernet Managed Switch Installation & Getting Started Guide
    Installation & Getting Started Guide for the LGB5028A and LGB5052A (Version 2)
 
  • Manual... 
  • LPB5000 Series Gigabit PoE+ Ethernet Managed Switch Eco User Manual
    User Manual for the LPB5028A and LPB5052A. (Version 1)
 
  • Manual... 
  • Gigabit Managed Switch User Manual
    User Manual for the LGB1108A, LGB1126A, and LGB1148A (Version 1)
 
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