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spare pair supply

Spare pair stands for replacement pair. They are unused wire pairs of an RJ45 connector. Such spare wire pairs, which can be contacts 4/5 and 7/8, are used in Power over Ethernet (PoE) for the power supply between the Power Sourcing Equipment (PSE) and the Powered Devices

(PD). The spare pair method can only be used with eight-wire cabling and has the advantage over phantom power that the power supply is transmitted over separate wires, and not over data lines as with phantom power. The spare pair method can be used with 100Base-TX and 10Base-T and transmits the power on the unused wire pairs 4, 5 and 7, 8.

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Englisch: spare pair supply
Updated at: 30.01.2020
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