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Product Data Sheets (pdf)...WRT4000 Series Cellula Wireless Routers

  • Manual... 
  • Wireless Point-to-Multipoint Ethernet Extender Access Point User Manual
    User Manual for the LWE121A (Version 1)
 
  • Quick Start Guide... 
  • 4-Port Hardened Serial Server QSG
    Quick Start Guide for the LES424A (Version 1)
 
  • Manual... 
  • 1-Port Modbus Hardened Serial Server User Manual
    User Manual for the LES431A (Version 1)
 

Black Box Explains... GBICs

A Gigabit Interface Converter (GBIC) is a transceiver that converts digital electrical currents to optical signals and back again. GBICs support speeds of 1 Gbps or more and are typically... more/see it nowused as an interface between a high-speed Ethernet or ATM switch and a fiber backbone. GBICs are hot-swappable, so switches don’t need to be powered down for their installation. collapse


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


Product Data Sheets (pdf)...CPU Security Cabinets  CPU Mobile Security Cabinets


Product Data Sheets (pdf)...Industrial Managed Gigabit Ethernet Switches


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

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