IEEE 802.4 token bus
E406985
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.
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/CD
ⓘ
linked to:
CSMA
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 ⓘ
linked to:
IEEE 802.3 Ethernet standard
|
| requires | ordered list of stations for token passing ⓘ |
| scope | baseband communication over bus ⓘ |
| standardNumber |
IEEE 802.4
ⓘ
linked to:
IEEE 802.4 token bus
|
| 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
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 802.4 token bus Description of subject: 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.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: IEEE 802.4 token bus