{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.insertion-loss","code":"thing-q947396","url":"https://ver.cy/models/thing/q947396/","name":"Insertion loss","alternateNames":[],"kind":"thing","status":"published","version":"0.1.0-research.1","language":"en","classifiers":{"family":"Thing Registry","category":"Activities and processes","entryKind":"thing","plane":"ACT","domain":["ACT.PRC"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"Insertion loss is the reduction in transmitted signal level caused by inserting a component or system into a specified path, relative to a defined reference configuration and usually expressed in decibels.","purpose":"Enable an agent to identify, interpret, compare and act on insertion-loss measurements without separating a reported loss from its reference configuration and operating conditions.","scope":{"in":["The before-insertion and after-insertion configurations that define a loss comparison","Electrical, radio-frequency, optical and acoustic operationalisations, with their differences recorded explicitly","Loss values and spectra, including units, sign conventions and uncertainty","Source, receiver, interface and environmental conditions affecting interpretation","Evidence supporting comparison, acceptance and diagnosis"],"out":["Complete models of cables, connectors, filters, silencers and other inserted devices","Return loss and reflection coefficients as independent quantities","Intrinsic material absorption and attenuation coefficients","Complete scattering matrices, phase response and group delay","End-to-end link budgets and acoustic exposure assessments","Instrument design and calibration procedures beyond evidence needed to validate the result"],"boundaries":[]},"distinguishingFeatures":["An insertion-loss instance identifies both an inserted element and the reference configuration against which its effect is evaluated; an isolated output-power reading is insufficient.","It compares transmission to a receiver or downstream subsystem, whereas return loss compares incident and reflected signals.","A reported value belongs to specified interfaces and operating conditions, rather than being an unconditional material property.","Its interpretation requires an explicit sign convention: a logarithmic transmission trace and a positive loss value may encode opposite signs.","It does not by itself identify how much missing transmitted power was absorbed, reflected, scattered or transferred to another mode."],"structure":{"bundles":[{"id":"definition-and-convention","name":"Definition and convention","description":"Establishes what the reported insertion loss means in its technical community.","layers":[{"id":"operational-meaning","name":"Operational meaning","description":"Identifies the comparison that constitutes an instance.","findings":[{"id":"comparison-quantity","name":"Comparison quantity","description":"Record the before-and-after observable and the authority defining it. The ASA terminology database includes a delivered-power definition based on power reaching the downstream system before and after insertion. [ASA terminology database](https://asastandards.org/working-groups-home/working-groups-portal/asa-standard-term-database/)","questions":[{"text":"Which technical field and authoritative definition govern this insertion-loss claim?","id":"comparison-quantity-q01","kind":"definition"},{"text":"What observable is compared before and after insertion, and at which receiving boundary?","id":"comparison-quantity-q02","kind":"measurement"}]}]},{"id":"formula-and-sign","name":"Formula and sign","description":"Makes numerical interpretation and conversion explicit.","findings":[{"id":"reported-loss-convention","name":"Reported loss convention","description":"Record the numerator, denominator, logarithmic multiplier and sign; require the relevant assumptions before converting power, amplitude or transmission-parameter data.","questions":[{"text":"What exact formula produces the reported dB value, and does positive mean reduced transmission?","id":"reported-loss-convention-q01","kind":"definition"},{"text":"If amplitude data or S-parameters are used, what impedance, normalisation and reference assumptions justify the conversion?","id":"reported-loss-convention-q02","kind":"measurement"}]}]}]},{"id":"insertion-reference-and-boundaries","name":"Insertion reference and boundaries","description":"Defines the physical comparison underlying the quantity.","layers":[{"id":"baseline-configuration","name":"Baseline configuration","description":"Captures the system against which insertion is assessed.","findings":[{"id":"reference-equivalence","name":"Reference equivalence","description":"Describe the baseline connection, bypass or removed-element configuration and any unavoidable difference between reference and inserted measurements.","questions":[{"text":"What physically or mathematically replaces the inserted element in the baseline?","id":"reference-equivalence-q01","kind":"definition"},{"text":"Which source, receiver and path conditions remain equivalent across the two configurations?","id":"reference-equivalence-q02","kind":"boundary"}]}]},{"id":"included-transmission-path","name":"Included transmission path","description":"Locates the boundaries of the claimed result.","findings":[{"id":"interfaces-and-fixtures","name":"Interfaces and fixtures","description":"Record whether connectors, adapters, mounting structures, fixtures and coupling interfaces contribute to the result or have been removed by correction.","questions":[{"text":"Where are the reference planes or acoustic observation boundaries, and which interfaces lie between them?","id":"interfaces-and-fixtures-q01","kind":"boundary"},{"text":"Which fixture or interface contributions were removed, and what evidence supports those corrections?","id":"interfaces-and-fixtures-q02","kind":"provenance"}]}]}]},{"id":"operating-conditions-and-spectrum","name":"Operating conditions and spectrum","description":"Records where and under what excitation the loss claim applies.","layers":[{"id":"spectral-description","name":"Spectral description","description":"Distinguishes individual samples, resolved spectra and aggregated values.","findings":[{"id":"band-and-aggregation","name":"Band and aggregation","description":"Preserve measurement coordinates, resolution and any averaging or weighting used to compress a spectrum into a reported value.","questions":[{"text":"At which frequencies, wavelengths or bands was insertion loss measured, and with what resolution?","id":"band-and-aggregation-q01","kind":"measurement"},{"text":"Is the stated value a point, maximum, average or weighted band result, and how was it calculated?","id":"band-and-aggregation-q02","kind":"definition"}]}]},{"id":"coupling-and-state","name":"Coupling and state","description":"Captures conditions that affect transfer through the inserted element.","findings":[{"id":"applicable-operating-envelope","name":"Applicable operating envelope","description":"Record domain-relevant conditions such as terminations, optical launch and polarisation, acoustic geometry, signal level and environmental state.","questions":[{"text":"Which source, load, launch, mode, polarisation or geometric conditions define this result?","id":"applicable-operating-envelope-q01","kind":"measurement"},{"text":"Over which signal levels, directions and environmental states has the reported loss been established?","id":"applicable-operating-envelope-q02","kind":"boundary"}]}]}]},{"id":"measurement-evidence-and-validity","name":"Measurement evidence and validity","description":"Connects a loss claim to observations and their limitations.","layers":[{"id":"measurement-method","name":"Measurement method","description":"Identifies the acquisition and processing route.","findings":[{"id":"traceable-observations","name":"Traceable observations","description":"Preserve original observations, instrument configuration and calibration evidence. Keysight documents S21 and S12 as forward and reverse transmission measurements associated with insertion loss. [Keysight measurement parameters](https://helpfiles.keysight.com/csg/e5055a/S1_Settings/Measurement_Parameters.htm)","questions":[{"text":"Which raw readings, traces or files support the reference and inserted-state values?","id":"traceable-observations-q01","kind":"provenance"},{"text":"Which calibration, normalisation and processing steps connect those observations to the reported loss?","id":"traceable-observations-q02","kind":"measurement"}]}]},{"id":"uncertainty-and-detectability","name":"Uncertainty and detectability","description":"Determines whether the observed difference is resolved and repeatable.","findings":[{"id":"result-confidence","name":"Result confidence","description":"Assess drift, reconnection variability, background or noise limits and uncertainty shared between the reference and inserted observations.","questions":[{"text":"What uncertainty budget covers both configurations, including correlated errors and repeatability?","id":"result-confidence-q01","kind":"measurement"},{"text":"Do dynamic range, background level or drift require reporting a bound or an unresolved result?","id":"result-confidence-q02","kind":"boundary"}]}]}]},{"id":"interpretation-and-decisions","name":"Interpretation and decisions","description":"Controls what an agent may infer or decide from insertion loss.","layers":[{"id":"mechanism-and-neighbours","name":"Mechanism and neighbours","description":"Separates measured transmission change from explanations of that change.","findings":[{"id":"loss-attribution","name":"Loss attribution","description":"Require additional evidence before attributing insertion loss to dissipation, reflection, leakage or mode redistribution; investigate unexpected signs against the declared baseline.","questions":[{"text":"Which additional reflection, absorption or modal measurements support the proposed explanation of the loss?","id":"loss-attribution-q01","kind":"provenance"},{"text":"If the result is negative or unexpectedly small, do reference conditions, changed coupling, active gain or measurement uncertainty explain it?","id":"loss-attribution-q02","kind":"action"}]}]},{"id":"comparison-and-acceptance","name":"Comparison and acceptance","description":"Turns qualified results into bounded engineering decisions.","findings":[{"id":"permitted-use","name":"Permitted use","description":"Record the intended transmission outcome, applicable limit and comparability requirements before ranking alternatives or combining component losses.","questions":[{"text":"Does the application require a maximum or minimum insertion loss, across which band and under what uncertainty decision rule?","id":"permitted-use-q01","kind":"action"},{"text":"Are references and operating conditions compatible enough to compare these results or add their dB values in a cascade?","id":"permitted-use-q02","kind":"boundary"}]}]}]},{"id":"evidence-and-external-alignment","name":"Evidence and external alignment","description":"What the world already says about this thing, gathered so the model can be checked against it.","layers":[{"id":"reported-evidence","name":"Reported evidence","description":"Findings from the breadth pass, kept separate from the structural claims.","findings":[{"id":"evidence-confidence-notes","name":"Check these first","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these check these first hold for the sense of Insertion loss this model covers, and on what evidence?","id":"evidence-confidence-notes-q01","kind":"provenance"}]},{"id":"evidence-kinds","name":"Kinds and varieties","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these kinds and varieties hold for the sense of Insertion loss this model covers, and on what evidence?","id":"evidence-kinds-q01","kind":"provenance"}]},{"id":"evidence-standards-and-regulation","name":"Standards and regulation","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these standards and regulation hold for the sense of Insertion loss this model covers, and on what evidence?","id":"evidence-standards-and-regulation-q01","kind":"provenance"}]},{"id":"evidence-real-world-use","name":"Real-world use","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these real-world use hold for the sense of Insertion loss this model covers, and on what evidence?","id":"evidence-real-world-use-q01","kind":"provenance"}]},{"id":"evidence-measurements","name":"Typical measurements","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these typical measurements hold for the sense of Insertion loss this model covers, and on what evidence?","id":"evidence-measurements-q01","kind":"provenance"}]},{"id":"evidence-failure-modes-and-hazards","name":"Failure modes and hazards","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these failure modes and hazards hold for the sense of Insertion loss this model covers, and on what evidence?","id":"evidence-failure-modes-and-hazards-q01","kind":"provenance"}]},{"id":"evidence-neighbours","name":"Neighbouring kinds and how to tell them apart","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these neighbouring kinds and how to tell them apart hold for the sense of Insertion loss this model covers, and on what evidence?","id":"evidence-neighbours-q01","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Measure and report insertion loss against the defined reference, with uncertainty.","Compare measured loss with a component's specification."],"mustNot":["Report measurements without stating the reference configuration and conditions.","Pass a component or link that fails its loss budget.","Look into a live optical fibre or treat eye protection as making direct viewing safe.","Test live optical fibres without appropriate optical safety controls."],"requiresHuman":["Accepting a link or system for service when it is near its loss limit."]},"ethics":{"considerations":["Networks used for emergency and medical services rely on honest test results.","Falsified test reports shift failures onto users later."],"affectedParties":["Network users","Technicians","Buyers of components"]},"owners":{"steward":"Nobody owns the concept; the operator of each network or system answers for its measurements.","roles":[],"masterSystems":[]},"relations":[{"target":"Q1341275","type":"parent","note":"registry parent class"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.insertion-loss","Wikidata: Q947396 (https://www.wikidata.org/wiki/Q947396)"]},"properties":{"applicability":"not-applicable","items":["Operational definition: Delivered-power ratio; specified transmission-parameter conversion; acoustic level difference; other documented convention","Insertion-loss value: dB, with formula and sign convention recorded","Spectral coordinates: Frequency in Hz or optical wavelength in m and appropriate multiples; bandwidth where applicable","Inserted element and reference path: Links to the tested element, baseline configuration and measurement boundaries","Excitation and receiving conditions: Source and load impedances; propagation mode; polarisation; optical launch; acoustic source and receiver geometry, as applicable","Direction and channel: Named input and output ports, forward or reverse direction, selected mode or channel","Measurement uncertainty: dB with uncertainty method, coverage and treatment of shared reference errors","Evidence validity: Supported; conditionally usable; unresolved; invalid for intended comparison"]},"recognition":{"applicability":"not-applicable","items":[]},"capabilities":{"applicability":"required","items":["Calculate insertion loss from compatible reference and inserted-state observations using a declared formula.","Normalise reporting conventions while preserving original measurements and assumptions.","Compare components or installation states under equivalent measurement conditions.","Evaluate a loss spectrum against a specified limit and uncertainty decision rule.","Identify whether an unexpected result warrants checking connections, calibration, matching or the reference configuration.","Contribute qualified component losses to a system assessment when composition assumptions hold."]},"hazards":{"applicability":"required","items":["Excess loss causes signal dropouts and failed links.","Testing optical links can expose eyes to invisible laser light."]},"interfaces":{"applicability":"required","items":["IEC 61300-3-4, issued by the International Electrotechnical Commission, specifies attenuation measurement methods for fibre optic interconnecting devices and passive components."]},"context":{"applicability":"required","items":["Insertion loss is used when evaluating components added to electrical, radio-frequency or optical signal paths.","It supports transmission budgets and comparisons of cables, connectors, filters and other components under specified operating conditions.","A meaningful result identifies the reference path, frequency or wavelength, and relevant connection conditions."]}},"sources":[{"title":"Wikidata item Q947396: Insertion loss","url":"https://www.wikidata.org/wiki/Q947396","note":"identity and sense of the item"},{"title":"Wikipedia: Insertion loss","url":"https://en.wikipedia.org/wiki/Insertion_loss","note":"general description of the item"}],"openQuestions":["Does vr.tr.insertion-loss intentionally cover electrical, optical and acoustic usage, or does its original registry provenance establish a narrower scope?","Which standards and editions should govern the distinct operational definitions, especially acoustic insertion loss versus transmission loss?","Should the ACT / ACT.PRC placement describe the assessment activity, or should this entry be related to a separate quantity model while retaining its registry identity?","What reference-method metadata is necessary to compare optical insertion-loss results obtained with different reference-cord arrangements?","Which domain-specific criteria should govern negative insertion-loss results and the validity of adding component losses in a cascade?"],"resources":{"spec":"/models/things/publications/thing-q947396/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q947396/spec.json"],"providers":["Codex"],"researchStatus":"unreviewed","generatedAt":"2026-09-12T10:30:12Z","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":"not-applicable","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 2026-10-07T12:16:35+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass","interaction.properties":"Plane ACT: no invented physical properties.","interaction.recognition":"Insertion loss is a measured relationship between signal levels and has no independent visual appearance."},"score":1.0}}