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  • Industrial Opto-Isolated RS-232 to RS-422/485 Converter Specification Sheet
    Specification Sheet for the ICD200A
 
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  • NEMA 12 Wallmount Cabinet Manual
    Manual for RMN600A-R2, RMN625A-R2 and RMN650A-R2 (Version 2)
 

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  • GigaTrue 550 CAT6, 550-MHz Solid Bulk Cable (4-Pair, PVC, Green) PDF Drawing
    PDF Drawing for the EYN878A-PB-1000 (1)
 
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  • Quick-Connect Surge Protector Spec Sheet
    Spec Sheet for SP602A (Version 1)
 

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  • GigaStation2 Wallplate (3-Port Single-Gang, Ivory)
    PDF Drawing for the WPT466
 
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  • Black GigaBase2 CAT5e Jack with Universal Wiring
    Drawing for the FMT921-R2 and FMT921-R2-25PAK.
 

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


Product Data Sheets (pdf)...Wireless Serial Servers

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