IEEE 802.3af Power over Ethernet standard
E1467
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.
All labels observed (5)
| Label | Occurrences |
|---|---|
| IEEE 802.3af | 9 |
| 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 standard
self-linksurface differs
ⓘ
surface form:
IEEE 802.3af Power over Ethernet
|
| 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 Ethernet standard
ⓘ
surface form:
IEEE 802.3 family of standards
|
| 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
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: IEEE 802.3af Power over Ethernet standard Description of subject: 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.
Referenced by (13)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
IEEE 802.3at Power over Ethernet Plus standard
IEEE 802.3af Power over Ethernet standard
→
fullName
→
IEEE 802.3af Power over Ethernet standard
self-linksurface differs
ⓘ
subject surface form:
IEEE 802.3af
this entity surface form:
IEEE 802.3af Power over Ethernet
IEEE 802.3bt 4‑pair Power over Ethernet standard
→
extends
→
IEEE 802.3af Power over Ethernet standard
ⓘ
subject surface form:
IEEE 802.3bt
this entity surface form:
IEEE 802.3af
IEEE 802.3bt 4‑pair Power over Ethernet standard
→
backwardCompatibleWith
→
IEEE 802.3af Power over Ethernet standard
ⓘ
subject surface form:
IEEE 802.3bt
this entity surface form:
IEEE 802.3af
this entity surface form:
IEEE 802.3af
this entity surface form:
IEEE 802.3af
this entity surface form:
IEEE 802.3af
this entity surface form:
IEEE 802.3af
this entity surface form:
IEEE 802.3af
this entity surface form:
IEEE 802.3af-2003
this entity surface form:
IEEE 802.3af
this entity surface form:
IEEE 802.3af