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Passive DC-to-DC injectors also exist which convert a 9 V to 36 V DC, or 36 V to 72 V DC power source to a stabilized 24 V 1 A, 48 V 0.5 A, or up to 48 V 2.0 A PoE feed with '+' on pins 4 & 5 and '−' on pins 7 & 8. These DC-to-DC PoE injectors are used in various telecom applications. [58]
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.
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Exceptions for the 7-pin connector may exist where they may be used for 6V and 24V. Vehicles and trailers with 6V systems can use the 7-pin or a 5-pin connector, but these are rare today. Heavy trucks that may have 12V systems are usually older (vintage vehicles) or on non-European markets.
Fig. 1: Schematic of a flyback converter. The flyback converter is used in both AC/DC, and DC/DC conversion with galvanic isolation between the input and any outputs. The flyback converter is a buck-boost converter with the inductor split to form a transformer, so that the voltage ratios are multiplied with an additional advantage of isolation.