{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.data-link","code":"thing-q1172466","url":"https://ver.cy/models/thing/q1172466/","name":"data link","alternateNames":["airborne data link","Tactical Data Link"],"kind":"thing","status":"published","version":"0.2.0-wave.1","language":"en","classifiers":{"family":"Thing Registry","category":"Cross-cutting context","entryKind":"thing","plane":"XCT","domain":["XCT.REL"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"A telecommunications connection between devices for transmitting digital information over wired or wireless media; specialised forms include airborne and military data links, described here only in general terms. A data link is distinct from the data link layer, a networking layer whose protocols can provide functions such as framing, addressing and error detection over a connection.","purpose":"Let an agent handle data links by type, protocol, layer and performance in general civil networking terms, without operational or military detail.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["A data link provides a connection for digital information transfer between devices.","Framing and error detection depend on the protocols used.","The connection can use wired or wireless media.","Data links can use standardised protocols."],"structure":{"bundles":[{"id":"concept","name":"Concept","description":"What it is.","layers":[{"id":"layer","name":"Layer","description":"OSI layer 2.","findings":[{"id":"layer-finding","name":"Layer","description":"Data link layer.","questions":[{"text":"What does the data link layer do?","kind":"definition"},{"text":"How does it differ from the physical and network layers?","kind":"definition"}]}]},{"id":"protocols","name":"Protocols","description":"Examples.","findings":[{"id":"protocols-finding","name":"Protocols","description":"Link protocols.","questions":[{"text":"Which data link protocol is used here?","kind":"definition"},{"text":"Which standard defines it?","kind":"provenance"}]}]}]},{"id":"performance","name":"Performance","description":"Speed and errors.","layers":[{"id":"capacity","name":"Capacity","description":"Throughput.","findings":[{"id":"capacity-finding","name":"Capacity","description":"Capacity.","questions":[{"text":"What throughput and latency does the link provide?","kind":"measurement"},{"text":"What limits it?","kind":"definition"}]}]},{"id":"errors","name":"Errors","description":"Detection.","findings":[{"id":"errors-finding","name":"Errors","description":"Error handling.","questions":[{"text":"How are errors detected or corrected on this link?","kind":"definition"},{"text":"Are error rates high?","kind":"measurement"}]}]}]},{"id":"operations","name":"Operations","description":"Troubleshooting.","layers":[{"id":"diagnose","name":"Diagnose","description":"Faults.","findings":[{"id":"diagnose-finding","name":"Diagnose","description":"Troubleshooting.","questions":[{"text":"How can a link fault be diagnosed?","kind":"action"},{"text":"Which tools help?","kind":"provenance"}]}]},{"id":"security","name":"Security","description":"Protection.","findings":[{"id":"security-finding","name":"Security","description":"Link security.","questions":[{"text":"Is the link encrypted and authenticated?","kind":"boundary"},{"text":"Which standard applies, such as WPA3 or MACsec?","kind":"provenance"}]}]}]},{"id":"limits","name":"Limits","description":"Agent conduct.","layers":[{"id":"military","name":"Military","description":"Tactical links.","findings":[{"id":"military-finding","name":"Military","description":"Military limits.","questions":[{"text":"Does the request seek operational or tactical military data link detail?","kind":"boundary"},{"text":"How should the agent decline?","kind":"action"}]}]},{"id":"senses","name":"Senses","description":"Disambiguation.","findings":[{"id":"senses-finding","name":"Senses","description":"Other senses.","questions":[{"text":"Is a hyperlink or a data connection in general meant?","kind":"boundary"},{"text":"Which entry fits?","kind":"action"}]}]}]}]},"agentConduct":{"may":["Monitor data links and report errors and outages on networks it is authorized to manage.","Configure links on equipment it administers according to the operator's policy."],"mustNot":["Intercept, inject or alter traffic on a link it does not own or administer.","Jam or disrupt data links, especially those used by aircraft, ships or emergency services.","Hide faults on links that carry safety-critical data.","Bypass link-layer security controls such as authentication."],"requiresHuman":["Taking down or reconfiguring a link that others depend on.","Changing links used for safety-critical or military communications."]},"ethics":{"considerations":["Data links carry private communications that must stay confidential.","Links in aviation and emergency services support lives."],"affectedParties":["Network users","People relying on safety services","Network operators"]},"owners":{"steward":"The network operator that owns the link; spectrum regulators license radio links.","roles":[],"masterSystems":["Radio spectrum licence registers"]},"relations":[{"target":"Q3833047","type":"parent","note":"registry parent class"},{"target":"telecommunications link","type":"related","note":"category"},{"target":"communication protocol","type":"related","note":"rules"},{"target":"OSI model layer 2","type":"related","note":"model"},{"target":"hyperlink","type":"related","note":"another sense"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.data-link","Wikidata: Q1172466 (https://www.wikidata.org/wiki/Q1172466)"]},"properties":{"applicability":"not-applicable","items":[]},"recognition":{"applicability":"optional","items":["A data link connects devices for the transmission of digital information.","Connections can use technologies or protocols such as Ethernet, Wi-Fi and PPP.","Layer 2 frames and MAC addresses are protocol-dependent features rather than the connection itself.","Hyperlinks are a different sense.","Cables, radio links and network interfaces; not visible as data."]},"capabilities":{"applicability":"required","items":["explain the data link layer","identify link protocols such as Ethernet and Wi-Fi","troubleshoot link problems","describe aviation data links in general terms"]},"hazards":{"applicability":"required","items":["Link failures and errors","Providing military operational detail","Insecure wireless links"]},"interfaces":{"applicability":"required","items":["IEEE 802 standards","ITU-T recommendations","Aviation communication standards"]},"context":{"applicability":"required","items":["Reliable data transfer between connected nodes.","Ethernet links","wireless links","point-to-point links","satellite links","aviation data links (general)"]}},"sources":[{"title":"Wikidata item Q1172466: data link","url":"https://www.wikidata.org/wiki/Q1172466","note":"identity and sense of the item"},{"title":"Wikipedia: Data link","url":"https://en.wikipedia.org/wiki/Data_link","note":"general description of the item"}],"openQuestions":["Should link technologies be separate entries?","How should standards be linked?","How should military content be excluded?"],"resources":{"spec":"/models/things/publications/thing-q1172466/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q1172466/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-11T11:14:07Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"not-applicable","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-07T10:10:25+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass","interaction.properties":"Plane XCT: no invented physical properties."},"score":1.0}}