IEEE 802.4 token bus

E406985

IEEE 802 LAN standard local area network technology token-passing network protocol

IEEE 802.4 token bus is a legacy IEEE LAN standard that used a token-passing access method over a bus topology to coordinate network communication among multiple stations.

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All labels observed (2)

Label	Occurrences
IEEE 802.4	2
IEEE 802.4 token bus canonical	1

How this entity was disambiguated

This entity first appeared as the object of triple T4020495 — 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 802.4 token bus
Context triple: [IEEE 802.2, designedForUseWith, IEEE 802.4 token bus]

A. IEEE 802.5
IEEE 802.5 is a networking standard that defines the token ring local area network (LAN) protocol and its associated physical and data link layer specifications.
B. 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.
C. IEEE 802.2
IEEE 802.2 is a legacy IEEE networking standard that defines the Logical Link Control (LLC) sublayer of the data link layer for local and metropolitan area networks.
D. STCP bus network
The STCP bus network is the primary public bus system serving Porto, Portugal and its metropolitan area, operated by Sociedade de Transportes Colectivos do Porto.
E. IEEE 802.24
IEEE 802.24 is an IEEE working group focused on developing and coordinating standards and guidance for vertical applications of IEEE 802 networking technologies, such as smart grid, smart cities, and industrial IoT.
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 802.4 token bus
Target entity description: IEEE 802.4 token bus is a legacy IEEE LAN standard that used a token-passing access method over a bus topology to coordinate network communication among multiple stations.

A. IEEE 802.5
IEEE 802.5 is a networking standard that defines the token ring local area network (LAN) protocol and its associated physical and data link layer specifications.
B. 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.
C. IEEE 802.2
IEEE 802.2 is a legacy IEEE networking standard that defines the Logical Link Control (LLC) sublayer of the data link layer for local and metropolitan area networks.
D. STCP bus network
The STCP bus network is the primary public bus system serving Porto, Portugal and its metropolitan area, operated by Sociedade de Transportes Colectivos do Porto.
E. IEEE 802.24
IEEE 802.24 is an IEEE working group focused on developing and coordinating standards and guidance for vertical applications of IEEE 802 networking technologies, such as smart grid, smart cities, and industrial IoT.
F. None of above. chosen

Statements (46)

Predicate	Object
instanceOf	IEEE 802 LAN standard ⓘ local area network technology ⓘ token-passing network protocol ⓘ
accessControl	deterministic access ⓘ priority-based access ⓘ
category	LAN access method ⓘ MAC layer protocol ⓘ
contrastWith	CSMA ⓘ surface form: CSMA/CD Ethernet bus topology with contention ⓘ
coordinationMechanism	token passed between stations ⓘ
defines	error control procedures ⓘ frame format ⓘ priority mechanisms ⓘ station addressing ⓘ token passing procedures ⓘ
designedFor	multiple stations on a shared bus ⓘ
governingBody	Institute of Electrical and Electronics Engineers ⓘ
guarantees	bounded access delay ⓘ
historicalSignificance	early deterministic LAN for industrial use ⓘ
layer	data link layer ⓘ
logicalRingManagement	reconfiguration ⓘ station deletion ⓘ station insertion ⓘ token maintenance ⓘ
logicalTopology	logical ring ⓘ
mediaAccessControlMethod	token passing ⓘ
partOf	IEEE 802 family of standards ⓘ
physicalMedium	coaxial cable ⓘ
primaryApplicationDomain	computer-integrated manufacturing ⓘ
replacedBy	Ethernet ⓘ IEEE 802.3 Ethernet standard ⓘ surface form: IEEE 802.3
requires	ordered list of stations for token passing ⓘ
scope	baseband communication over bus ⓘ
standardNumber	IEEE 802.4 token bus self-linksurface differs ⓘ surface form: IEEE 802.4
standardType	LAN MAC standard ⓘ
status	largely obsolete ⓘ legacy standard ⓘ
subLayer	MAC sublayer ⓘ
supports	multiple priority levels ⓘ real-time communication ⓘ time-critical traffic ⓘ
tokenType	control frame ⓘ
topologyType	bus topology ⓘ
useCase	factory floor networks ⓘ industrial automation ⓘ manufacturing environments ⓘ

How these facts were elicited

Referenced by (3)

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

IEEE 802.2 → designedForUseWith → IEEE 802.4 token bus ⓘ

RFC 1042 → relatedTo → IEEE 802.4 token bus ⓘ

this entity surface form: IEEE 802.4

IEEE 802.4 token bus → standardNumber → IEEE 802.4 token bus self-linksurface differs ⓘ