IEEE 802.3bt 4‑pair Power over Ethernet standard

E5018

IEEE 802.3 amendment IEEE standard Power over Ethernet standard

The IEEE 802.3bt 4‑pair Power over Ethernet standard is a networking specification that enables higher power delivery over all four twisted pairs of Ethernet cabling to support more demanding devices such as pan-tilt-zoom cameras, wireless access points, and building automation systems.

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All labels observed (4)

Label	Occurrences
IEEE 802.3bt	3
IEEE 802.3bt 4‑pair Power over Ethernet standard canonical	1
Type 3 PoE	1
Type 4 PoE	1

How this entity was disambiguated

This entity first appeared as the object of triple T12942 — 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 802.3bt 4‑pair Power over Ethernet standard
Context triple: [IEEE Standards Association, develops, IEEE 802.3bt 4‑pair Power over Ethernet standard]

A. IEEE 802.3af 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.
B. IEEE 802.1Qbv time‑sensitive networking standard
The IEEE 802.1Qbv time‑sensitive networking standard defines enhancements to Ethernet scheduling that enable deterministic, low-latency communication for time-critical applications such as industrial automation and automotive networks.
C. IEEE 802.3 Ethernet standard
The IEEE 802.3 Ethernet standard is the foundational specification that defines wired Ethernet networking technologies, including physical media, data link layer protocols, and methods for high-speed data transmission in local and metropolitan area networks.
D. IEEE 802.1D MAC bridging standard
The IEEE 802.1D MAC bridging standard is a networking specification that defines how Ethernet bridges and switches forward frames and prevent loops in local area networks, including the original Spanning Tree Protocol.
E. IEEE 802.1CM fronthaul standard
The IEEE 802.1CM fronthaul standard is a Time-Sensitive Networking (TSN) specification that defines Ethernet-based transport requirements and profiles for carrying mobile fronthaul traffic in 4G/5G radio access 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 802.3bt 4‑pair Power over Ethernet standard
Target entity description: The IEEE 802.3bt 4‑pair Power over Ethernet standard is a networking specification that enables higher power delivery over all four twisted pairs of Ethernet cabling to support more demanding devices such as pan-tilt-zoom cameras, wireless access points, and building automation systems.

A. IEEE 802.3af 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.
B. IEEE 802.1Qbv time‑sensitive networking standard
The IEEE 802.1Qbv time‑sensitive networking standard defines enhancements to Ethernet scheduling that enable deterministic, low-latency communication for time-critical applications such as industrial automation and automotive networks.
C. IEEE 802.3 Ethernet standard
The IEEE 802.3 Ethernet standard is the foundational specification that defines wired Ethernet networking technologies, including physical media, data link layer protocols, and methods for high-speed data transmission in local and metropolitan area networks.
D. IEEE 802.1D MAC bridging standard
The IEEE 802.1D MAC bridging standard is a networking specification that defines how Ethernet bridges and switches forward frames and prevent loops in local area networks, including the original Spanning Tree Protocol.
E. IEEE 802.1CM fronthaul standard
The IEEE 802.1CM fronthaul standard is a Time-Sensitive Networking (TSN) specification that defines Ethernet-based transport requirements and profiles for carrying mobile fronthaul traffic in 4G/5G radio access networks.
F. None of above. chosen

Statements (51)

Predicate	Object
instanceOf	IEEE 802.3 amendment ⓘ IEEE standard ⓘ Power over Ethernet standard ⓘ
alsoKnownAs	4‑pair Power over Ethernet standard ⓘ
appliesTo	1000BASE‑T ⓘ 100BASE‑TX ⓘ 10BASE‑T ⓘ 10GBASE‑T ⓘ linked to: 10GBASE-T 2.5GBASE‑T ⓘ 5GBASE‑T ⓘ linked to: IEEE 802.3bz 2.5G/5GBASE‑T Ethernet standard
area	Ethernet networking ⓘ linked to: IEEE 802.3 Ethernet standard Power over Ethernet ⓘ
backwardCompatibleWith	IEEE 802.3af ⓘ linked to: IEEE 802.3af Power over Ethernet standard IEEE 802.3at ⓘ
cablingType	balanced twisted‑pair copper cabling ⓘ
compatibleWith	Category 5e cabling or better ⓘ
defines	4‑pair Power over Ethernet ⓘ higher power classes for PoE ⓘ
definesMechanism	Autoclass ⓘ dual‑signature PDs ⓘ maintain power signature ⓘ power classification ⓘ power negotiation between PSE and PD ⓘ single‑signature PDs ⓘ
definesRole	Power Sourcing Equipment ⓘ Powered Device ⓘ
enables	power delivery over all four twisted pairs of Ethernet cabling ⓘ
extends	IEEE 802.3af ⓘ linked to: IEEE 802.3af Power over Ethernet standard IEEE 802.3at ⓘ
goal	maintain interoperability with existing Ethernet standards ⓘ
includes	electromagnetic compatibility considerations for PoE ⓘ safety requirements for PoE power delivery ⓘ
introduces	Type 3 PoE ⓘ linked to: IEEE 802.3bt 4‑pair Power over Ethernet standard Type 4 PoE ⓘ linked to: IEEE 802.3bt 4‑pair Power over Ethernet standard
objective	increase maximum available power over Ethernet ⓘ support more demanding powered devices ⓘ
partOf	IEEE 802.3 ⓘ linked to: IEEE 802.3 Ethernet standard
powerDeliveryMode	4‑pair powering ⓘ
standardizedBy	IEEE ⓘ linked to: Institute of Electrical and Electronics Engineers IEEE 802.3 Working Group ⓘ
supports	higher power delivery than earlier PoE standards ⓘ
supportsDeviceClass	Type 3 Powered Device ⓘ Type 4 Powered Device ⓘ
supportsUseCase	building automation systems ⓘ digital signage ⓘ lighting systems ⓘ pan‑tilt‑zoom cameras ⓘ point‑of‑sale terminals ⓘ thin clients ⓘ wireless access points ⓘ
uses	all four wire pairs for power delivery ⓘ

How these facts were elicited

Referenced by (6)

Full triples — surface form annotated when it differs from this entity's canonical label.

IEEE Standards Association → develops → IEEE 802.3bt 4‑pair Power over Ethernet standard ⓘ

IEEE 802.3bt → introduces → Type 3 PoE ⓘ

subject linked to: IEEE 802.3bt 4‑pair Power over Ethernet standard