fax
Enable an agent to recognise a fax as a page-oriented facsimile communication, assess its completeness and delivery state, and determine appropriate handling or retransmission.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
recalled by Codex without web access - no source was read
Researched by: Codex
Purpose and description
Enable an agent to recognise a fax as a page-oriented facsimile communication, assess its completeness and delivery state, and determine appropriate handling or retransmission.
Fax, or facsimile transmission, is a telecommunications method that transmits an encoded image of a document to a remote receiver for reproduction on paper or as an electronic image.
It can be Compare submitted and received page sets for omissions, ordering errors and degraded content.; Validate the intended recipient's association with the destination fax endpoint before dispatch.; Prepare and submit a page rendition through an authorised fax endpoint.; Interpret transmission reports while preserving uncertainty about human receipt.; Retry failed or incomplete transmissions with explicit links to earlier attempts.; Route, retain or dispose of received fax copies according to applicable handling instructions..
Distinguishing features
A fax has an asserted facsimile transmission context; a scanned document alone does not establish that it is a fax.
Its communicated content is organised as page images; extracted text is a derivative representation that may omit visual information.
A fax number or endpoint identifies a delivery destination but does not by itself establish the identity of the person receiving or reading it.
A transmission report describes an exchange or attempt and must be distinguished from the communicated document.
A fax machine is an apparatus that sends or receives faxes; an electronic fax rendition can exist without a paper copy.
Scope
+ Fax document identity, intended communication and page sequence
+ Source and received page representations and their fidelity
+ Sender, recipient and fax endpoint associations
+ Transmission attempts, reception evidence and failure states
+ Access, retention and handling requirements attached to fax content
- Fax machine construction, maintenance and physical inventory
- Telephone networks, numbering plans and general telecommunications infrastructure
- Fax service providers as organisations or commercial products
- The substantive case, transaction or business process discussed in the document
- General document authoring, scanning and optical character recognition systems
Characteristics
- Fax representation role
- source document | submitted fax rendition | received fax rendition | transmission report | extracted derivative Prevents a report, source file or OCR output from being mistaken for the received communication.
- Page count reconciliation
- pages expected, submitted and received; unknown allowed for each Exposes missing pages and disagreements over whether a cover sheet is included.
- Page imaging resolution
- horizontal and vertical samples per inch or per millimetre, with representation identified Helps assess preservation of small text, signatures and fine graphical details.
- Received page condition
- unchecked | legible | partially legible | illegible; clipping, missing regions and orientation recorded separately Successful transport does not guarantee usable document content.
- Endpoint and party association
- sending or receiving endpoint linked to an asserted party, verification evidence and observation time Separates routing information from verified sender or recipient identity.
- Transmission path
- telephone fax | IP fax | service-mediated fax | mixed | unknown Locates conversions and handoffs that affect available delivery evidence.
- Attempt outcome
- queued | attempting | reported successful | reported failed | indeterminate Supports recovery without treating reported transport success as human acknowledgement.
- Recipient acknowledgement
- none recorded | receipt acknowledged | readability acknowledged | disputed Distinguishes endpoint reception from confirmation by the intended recipient.
- Handling constraints
- applicable access, routing, retention and disposal instructions linked to their authority Guides handling of copies across fax inboxes, printouts and downstream systems.
Also called
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 19 findings · 32 questions.
Fax identity and boundaries Establishes which communication and representations constitute the fax being modelled.
The word fax can identify a document, an exchange or an apparatus; agents need an explicit informational boundary.
Communication identity
Identifies the intended page-oriented communication independently of individual attempts.
Fax communication boundary
Record the intended message and the evidence that places it within a facsimile exchange.
- What document or page set is intended to constitute this fax? definition
- What evidence establishes fax transmission rather than scanning or ordinary file transfer? boundary
Representation lineage
Connects source files, submitted pages, received renditions and derivatives.
Rendition and report separation
Identify each artifact's role and preserve its relationship to the communication and transmission attempt.
- Is this artifact the source, submitted rendition, received rendition, report or an extracted derivative? definition
- Which conversion, reception or extraction produced this artifact, and from which predecessor? provenance
Page integrity and readability Describes whether the received fax preserves the intended page content in usable form.
Fax completion must account for page omissions and image degradation, not only transmission status.
Page set reconciliation
Compares expected, submitted and received page sequences.
Page count and order
Record page totals, ordering and the treatment of cover sheets, blank pages and repeated pages.
- How many pages were expected, submitted and received, and does each total include the cover sheet? measurement
- Which received pages are missing, repeated, out of order or unmatched to the submitted rendition? measurement
Image fidelity
Assesses losses introduced by scanning, conversion, transport or output.
Critical content legibility
Assess whether text and visual marks needed for the fax's purpose remain interpretable.
- Which pages or regions show clipping, streaking, low contrast, distortion or unreadable detail? measurement
- Do defects obscure information needed to act on this fax, such as amounts, identifiers or signature marks? action
- Which source and received renditions are available for a direct fidelity comparison? provenance
Fax addressing and handoffs Connects intended parties to fax endpoints and identifies service or network transitions.
A correctly dialled endpoint can still route to the wrong person, and service acceptance can precede actual fax delivery.
Party endpoint binding
Separates asserted identities, dialled destinations and verified endpoint ownership or use.
Destination and sender evidence
Record how endpoints and displayed sender identifiers are associated with the relevant parties.
- Which destination was used, and how was its association with the intended recipient verified? provenance
- Which sender identity claims come from document content, displayed fax identifiers or independent verification? provenance
- Does the destination serve a shared inbox or machine requiring additional recipient routing? boundary
Transmission handoffs
Identifies observable stages between submission and the recipient's accessible copy.
Service and endpoint stages
Record known gateways, fax endpoints and subsequent inbox or print delivery stages.
- Which stages are known between submitting the document and making the received copy available? provenance
- At which stage does each available acceptance or delivery report apply? boundary
Delivery evidence and recovery Tracks fax attempts, interprets their evidence and supports controlled retransmission.
Fax exchanges can fail, partly complete or produce uncertain outcomes that make retries create duplicate communications.
Attempt evidence
Records attempt-specific results without overstating what they prove.
Reported outcome and acknowledgement
Separate transport reports, page reception evidence and recipient acknowledgement.
- What outcome, timestamp, page total and error information does the report record for this attempt? measurement
- What does the reporting system define as success, and is recipient acknowledgement recorded separately? definition
Retransmission control
Relates repeat attempts to prior deliveries and content revisions.
Retry scope and duplicate risk
Determine what needs resending and make repeated or corrected communications recognisable.
- Does the evidence support resending the entire fax, selected pages or a corrected rendition? action
- How will the recipient distinguish this retry from a new instruction or an additional transaction? action
- Which earlier attempts and document versions does the retransmission repeat or supersede? provenance
Fax copy handling Controls the exposure and continuing use of fax renditions and associated evidence.
Fax reception can create paper and electronic copies in shared locations with different access and retention conditions.
Recipient access
Assesses who can access the received fax and how it reaches the intended recipient.
Shared reception exposure
Record access conditions for receiving devices, service inboxes, forwarding destinations and printouts.
- Who can access the receiving inbox, machine output or automatically forwarded copy? boundary
- What authorised routing or collection action is needed to place the fax with its intended recipient? action
Copy retention and evidence
Links retained fax renditions and reports to applicable handling instructions.
Retained rendition selection
Identify which copies and reports support future use or review and what governs their retention.
- Which received rendition and transmission evidence must remain linked for later review? action
- Which documented policy or instruction governs retention and disposal of fax images, reports and paper copies? provenance
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- The name can denote the transmission method, an apparatus or a received document; this description covers the method.
- This is recall-based information, with no sources consulted; standard editions and jurisdiction-specific requirements need verification.
- The measurement values describe common Group 3 capabilities, not every fax implementation or negotiated connection.
- Which of these check these first hold for the sense of fax this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Group 3 fax
- Group 4 fax
- Fax over IP
- Internet fax services
- Which of these kinds and varieties hold for the sense of fax this model covers, and on what evidence? provenance
Identifiers and schemes
Recalled without web access and unsourced; every item is a lead to verify.
- ITU-T E.164 - International telephone number with at most 15 digits - Identifies a fax endpoint reached through the telephone network; it does not identify an individual document.
- Which of these identifiers and schemes hold for the sense of fax this model covers, and on what evidence? provenance
Standards and regulation
Recalled without web access and unsourced; every item is a lead to verify.
- ITU-T T.30 specifies procedures for document facsimile transmission in the general switched telephone network.
- ITU-T T.4 specifies Group 3 facsimile terminal characteristics, including image coding.
- ITU-T T.6 specifies Group 4 facsimile image coding schemes.
- ITU-T T.38 specifies procedures for real-time Group 3 facsimile communication over IP networks.
- ITU-T T.37 specifies store-and-forward facsimile transmission over the Internet.
- Which of these standards and regulation hold for the sense of fax this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Exchanging scanned forms and signed documents between organisations.
- Transmitting referrals, prescriptions and other healthcare documents where fax workflows are supported.
- Submitting administrative documents to offices that accept fax.
- Connecting legacy fax machines to digital messaging and document-management services.
- Which of these real-world use hold for the sense of fax this model covers, and on what evidence? provenance
Typical measurements
Recalled without web access and unsourced; every item is a lead to verify.
- Group 3 modem data rate - 2.4-33.6 - kbit/s
- Common Group 3 horizontal sampling density - 8 - pixels/mm
- Common Group 3 vertical sampling density in standard and fine modes - 3.85-7.7 - lines/mm
- Which of these typical measurements hold for the sense of fax this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- An incorrect destination number can disclose confidential documents.
- Line noise, disconnections or incompatible gateways can interrupt transmission or damage received images.
- Low resolution and bilevel image conversion can obscure small print, handwriting and shaded content.
- Paper jams, depleted consumables or unattended output trays can prevent retrieval or expose documents.
- A transmission confirmation does not establish that the intended person read the document.
- Which of these failure modes and hazards hold for the sense of fax this model covers, and on what evidence? provenance
Regional variation
Recalled without web access and unsourced; every item is a lead to verify.
- Dialling conventions and telephone-network interfaces vary by country.
- Acceptance of faxed documents and signatures depends on jurisdiction, institution and document type.
- Reliance on fax differs across countries and sectors, particularly in healthcare and public administration.
- Which of these regional variation hold for the sense of fax this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- fax machine - The machine is a physical endpoint implementing fax; fax is the transmission method.
- scanner - A scanner digitises a document locally; fax additionally communicates its image to a remote endpoint.
- email - Email exchanges electronic messages and attachments; fax uses facsimile transmission conventions, although services can bridge the two.
- photocopier - A photocopier reproduces a document locally without requiring remote transmission.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of fax this model covers, and on what evidence? provenance
What the second pass must settle
- Does the registry intend fax to mean the communicated document, the communication method or the apparatus, and does an existing world model already own any of these senses?
- Which fax standards and service interfaces should supply authoritative definitions of page acceptance, successful completion and error outcomes?
- How should communication identity be preserved when retries send only missing pages or incorporate corrected content?
- Which use-specific criteria establish adequate readability and fidelity for acting on a received fax?
- Which organisational or jurisdictional requirements govern recipient verification, evidentiary use and retention in the intended deployment?