Loading


Categories (x) > Networking > Switches > Power over Ethernet Switches > PoE PSE Switches (x)

Results 1-10 of 34 1 2 3 4 > 
  • Application Note... 
  • LEH Series Ethernet Swtich Application Note
    Network Redundancy with LEH Series Ethernet Switches (Version 1)
 

Product Data Sheets (pdf)...8-Port Hardened Gigabit PoE+ Switch

  • Quick Start Guide... 
  • PoE+ Fast Ethernet Unmanaged Switch (8-Port) QSG
    Quick Start Guide for the LPB308A (Version 1)
 
  • Firmware... 
  • 26-Port PoE+ Gigabit Managed Switch Eco Firmware
    Firmware for the LPB2826A (Version v1.59)
 

Product Data Sheets (pdf)...PoE L2 Managed 10/100 Switch with (2) Dual-Media SFP Ports


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... 
  • 10/100 PSE Web Smart Switch User Manual
    User Manual for 10/100 PSE Web Smart Switch (2)
 
  • Visio Stencil Drawing... 
  • Visio Stencil
    Stencil Drawings
 
  • Video...Hardened Managed Ethernet Switches Overview

    See how the LEH family of Hardened Managed Ethernet Switches provides increased reliability and redundancy in industrial networks. This brief overview covers how the switches are designed to withstand extreme... more/see it nowtemperatures and harsh conditions in a multitude of environments from the factory floor to traffic control. collapse

  • Firmware... 
  • 48-Port PoE+ Gigabit Managed Switch Eco
    Firmware for the LPB2848A (Version v1.58)
 
Results 1-10 of 34 1 2 3 4 > 
Close

Support

Delivering superior technical support is our highest priority. Depending on the products or services we provide for you, please visit your appropriate support area.



 

You have added this item to your cart.

Important message about your cart:

You requested more of "" than the currently available. The quantity has been changed to them maximum quantity available. View your cart.

Print
Black Box 1-800-316-7107 Black Box Network Services