IEEE 802.3af Power over Ethernet standard

E1467

IEEE standard Power over Ethernet standard

The IEEE 802.3af Power over Ethernet standard defines a method for delivering electrical power along with data over standard Ethernet cabling to devices such as IP phones, wireless access points, and network cameras.

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All labels observed (5)

Label	Occurrences
IEEE 802.3af	10
IEEE 802.3af Power over Ethernet	1
IEEE 802.3af Power over Ethernet standard canonical	1
IEEE 802.3af-2003	1
IEEE 802.3at Power over Ethernet Plus standard	1

How this entity was disambiguated

This entity first appeared as the object of triple T12940 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: IEEE 802.3af Power over Ethernet standard
Context triple: [IEEE Standards Association, develops, IEEE 802.3af Power over Ethernet standard]

A. IEEE 802.11
IEEE 802.11 is a family of wireless networking standards that define the protocols for implementing Wi‑Fi local area networks.
B. IEEE 1394
IEEE 1394 is a high-speed serial bus interface standard, commonly known as FireWire, used for real-time data transfer between digital devices such as computers, cameras, and audio/video equipment.
C. IEEE Standards Association
The IEEE Standards Association is a leading global organization that develops and maintains technical standards across a wide range of industries, including electronics, communications, and information technology.
D. Internet Engineering Task Force
The Internet Engineering Task Force (IETF) is an open, international standards organization that develops and promotes voluntary technical standards, particularly those that make up the core protocols and architecture of the Internet.
E. TCP/IP
TCP/IP is the fundamental communication protocol suite that enables data transmission and networking across the internet and most modern computer networks.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: IEEE 802.3af Power over Ethernet standard
Target entity description: The IEEE 802.3af Power over Ethernet standard defines a method for delivering electrical power along with data over standard Ethernet cabling to devices such as IP phones, wireless access points, and network cameras.

A. IEEE 802.11
IEEE 802.11 is a family of wireless networking standards that define the protocols for implementing Wi‑Fi local area networks.
B. IEEE 1394
IEEE 1394 is a high-speed serial bus interface standard, commonly known as FireWire, used for real-time data transfer between digital devices such as computers, cameras, and audio/video equipment.
C. IEEE Standards Association
The IEEE Standards Association is a leading global organization that develops and maintains technical standards across a wide range of industries, including electronics, communications, and information technology.
D. Internet Engineering Task Force
The Internet Engineering Task Force (IETF) is an open, international standards organization that develops and promotes voluntary technical standards, particularly those that make up the core protocols and architecture of the Internet.
E. TCP/IP
TCP/IP is the fundamental communication protocol suite that enables data transmission and networking across the internet and most modern computer networks.
F. None of above. chosen

Statements (50)

Predicate	Object
instanceOf	IEEE standard ⓘ Power over Ethernet standard ⓘ
abbreviation	PD ⓘ PSE ⓘ
alsoKnownAs	PoE ⓘ
appliesTo	100BASE-TX ⓘ 10BASE-T ⓘ twisted-pair Ethernet cabling ⓘ
backwardCompatibleWith	non-PoE Ethernet devices ⓘ
category	networking standard ⓘ power delivery standard ⓘ
classificationMethod	power class levels ⓘ
defines	method for delivering electrical power over Ethernet cabling ⓘ power over data pairs for Ethernet ⓘ power over spare pairs for Ethernet ⓘ
definesDeviceType	Power Sourcing Equipment ⓘ Powered Device ⓘ
definesPoweringMode	Mode A ⓘ Mode B ⓘ
ensures	safe coexistence of PoE and non-PoE devices on same cable plant ⓘ
fullName	IEEE 802.3af Power over Ethernet ⓘ linked to: IEEE 802.3af Power over Ethernet standard
governs	interoperability between PoE equipment from different vendors ⓘ
includesMechanism	PD classification ⓘ PD detection ⓘ overload protection ⓘ short-circuit protection ⓘ
maximumPowerAtPSE	15.4 W ⓘ 15.4 watts ⓘ
maximumPowerDeliveredToPD	12.95 W ⓘ 12.95 watts ⓘ
modeADescription	power over data pairs (1-2 and 3-6) ⓘ
modeBDescription	power over spare pairs (4-5 and 7-8) ⓘ
nominalVoltage	48 V DC ⓘ 48 volts DC ⓘ
objective	provide power and data over a single Ethernet cable ⓘ
partOf	IEEE 802.3 family of standards ⓘ linked to: IEEE 802.3 Ethernet standard
powerClassRange	Class 0 to Class 3 ⓘ
publishedBy	Institute of Electrical and Electronics Engineers ⓘ
region	international ⓘ
supersededBy	IEEE 802.3at ⓘ
supportsCableLength	up to 100 meters ⓘ up to 328 feet ⓘ
usedFor	IP phones ⓘ VoIP phones ⓘ network cameras ⓘ small network switches ⓘ wireless access points ⓘ
usesConnector	RJ45 ⓘ
usesMedium	Category 3 or better twisted-pair cable ⓘ Category 5 or better twisted-pair cable ⓘ

How these facts were elicited