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Power over Ethernet (PoE) describes any of several standards or ad hoc systems that pass electric power along with data on twisted-pair Ethernet cabling. This allows a single cable to provide both a data connection and enough electricity to power networked devices such as wireless access points (WAPs), IP cameras and VoIP phones .
Phantom powering was first used for landline copper wire-based plain old telephone service since the introduction of the rotary dial telephone in 1919. One such application in the telephone system was to provide a DC signalling path around transformer-connected amplifiers such as analogue line transmission systems.
An automotive wiring diagram, showing useful information such as crimp connection locations and wire colors. These details may not be so easily found on a more schematic drawing. A wiring diagram is a simplified conventional pictorial representation of an electrical circuit. It shows the components of the circuit as simplified shapes, and the ...
A 48 V system can provide more power, improve energy recuperation, [7] and allow up to an 85% decrease in cable mass. [10]12-volt systems can provide only 3.5 kilowatts, while a 48 V power could achieve 15 to 20 kW or even 50 kW. 48 volts is below the level that is considered safe in dry conditions without special protective measures. [11]
A power converter is an electrical device for converting electrical energy between alternating current (AC) and direct current (DC). It can also change the voltage or frequency of the current. Power converters include simple devices such as transformers, and more complex ones like resonant converters.
Equipment rooms house equipment and wiring consolidation points that serve the users inside the building or campus. Backbone cabling is the inter-building and intra-building cable connections in structured cabling between entrance facilities, equipment rooms and telecommunications closets.
Used in Acer Aspire V5 adapter and some Hikvision 48V NVRs 5.50 2.10 M CUI Inc. P5 CUI Inc. PP3–002A Kobiconn 3217-EX Philmore 210, 210L, 2109 Switchcraft 762, 763 [6] CUI Inc. PR-002A (inline) Kobiconn 0302 (inline) Philmore 257 (inline) Switchcraft 721A (panel) [7] 2.1 mm center pin Common on guitar effect pedals Arduino power adapter
A fuse contains a short piece of wire which melts if too much current flows. This effectively disconnects the power supply from its load, and the equipment stops working until the problem that caused the overload is identified and the fuse is replaced. Some power supplies use a very thin wire link soldered in place as a fuse. Fuses in power ...