modem
Enable an agent to recognise a modem, assess its communication readiness and condition, and determine which connection, configuration, diagnostic and recovery actions are appropriate.
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 modem, assess its communication readiness and condition, and determine which connection, configuration, diagnostic and recovery actions are appropriate.
A modem is a communications device or functional subsystem that modulates a signal to encode digital data for transmission over a communications channel and demodulates received signals to recover digital data.
It can be Check a candidate modem against the intended medium, peer, provider requirements and host interface.; Attach compatible line, antenna, host and power connections using documented installation constraints.; Provision permitted link settings and initiate or restore a connection.; Read link states, signal metrics and event history to isolate likely modem, medium, host or provisioning faults.; Apply authorised firmware or configuration changes while accounting for service interruption and recovery.; Reset, replace or decommission the modem with appropriate handling of credentials and provider registration..
Distinguishing features
Identify a function that both produces a communication-medium waveform from data and recovers data from a received waveform; packet forwarding alone does not establish modem identity.
Distinguish a router's selection of packet paths from the modem's establishment and operation of the underlying communication link, even when one enclosure performs both functions.
Distinguish a modem from a bare radio transceiver by evidence of the data modulation and demodulation function rather than transmission and reception alone.
Identify the supported link family and compatible peer or access equipment; an Ethernet socket, SIM slot or antenna connector alone is insufficient evidence.
For an embedded modem, locate the functional boundary between the modem, its host and any shared processor, power or antenna resources.
Scope
+ Conversion between host-side data and signals carried over the supported communication medium
+ Link technology, peer compatibility, negotiation and registration requirements
+ Host, line, antenna and power interfaces relevant to modem operation
+ Link state, signal quality, negotiated rates and modem-specific diagnostics
+ Provisioning, firmware, configuration, maintenance and permitted recovery actions
- Routing, firewall, Wi-Fi access-point and switching functions bundled into a gateway
- Provider access networks, subscriber contracts and billing arrangements
- Applications, remote services and end-to-end Internet performance beyond the modem link
- Standalone antennas, external cabling and power supplies as independently maintained things
- General-purpose software implementations without an identified physical modem host
Characteristics
- Communication medium and link family
- Documented family and medium, such as telephone-band, DSL, cable, cellular or another radio link Determines which connections, diagnostics and compatibility checks apply.
- Supported link specifications
- Specification identifier, issuing body, revision, supported profile and evidence source Allows compatibility to be judged against an explicit specification rather than a marketing label.
- Modem integration
- Dedicated external device, internal module, embedded subsystem or modem within a multifunction gateway Locates the modem boundary and identifies shared resources affected by an action.
- Host and medium interfaces
- Interface role, connector, electrical or radio specification and supported operating mode Prevents incompatible attachment and distinguishes data, line, antenna and management connections.
- Transmit and receive capability
- Supported modulation, coding, duplex modes, channels and frequency ranges where applicable Defines the signal capabilities required for a compatible link.
- Negotiated link rate
- bit/s separately for each direction, with timestamp and rate definition Separates the active link's capacity from advertised capability and measured application throughput.
- Medium-specific signal quality
- Named metric with its native unit, such as dB or dBm where applicable, direction, channel and timestamp Supports diagnosis without treating unlike signal metrics as interchangeable.
- Communication state
- Observed vendor state mapped where possible to powered off, initialising, searching, training, synchronised, registered, data ready, degraded or faulted Determines whether the modem is ready for traffic and where establishment has stopped.
- Provisioning dependency
- Required provider acceptance, subscriber credential reference, device identity registration or peer configuration; none or unknown where appropriate Explains why a technically compatible modem may still lack service.
- Error and interruption history
- Named counter, count or rate, observation interval, reset time and relevant link or channel Distinguishes persistent degradation from isolated errors and counter-reset effects.
- Power requirements
- Rated input V, A and W as documented, supply type and connector or bus-power requirements Supports supply compatibility checks and investigation of resets or unstable operation.
- Firmware and configuration identity
- Firmware version, hardware revision, configuration profile and management authority Makes supported features, diagnostic behaviour and permissible changes traceable.
Also called
+13
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.modem
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 19 findings · 35 questions.
Modem identity and boundary Establishes what performs modulation and demodulation and separates it from neighbouring device functions.
A modem may be a dedicated device or one subsystem of a gateway, so enclosure labels alone cannot establish its identity or responsibilities.
Data-to-signal function
Identifies the communication medium and the conversion function that makes the thing a modem.
Modulation and demodulation evidence
Record evidence of the outbound and inbound signal conversion without assuming every network adapter is a modem.
- Which data input is converted into which transmitted signal, and how is received data recovered? definition
- Which manufacturer documentation or interface specification identifies this modem function and its supported medium? provenance
Integration boundary
Locates modem responsibilities within standalone, embedded and multifunction equipment.
Host and gateway separation
Record which functions belong to the modem and which depend on its host or a bundled router.
- Where does the modem link function end and host networking, routing or Wi-Fi operation begin? boundary
- Which processor, antenna, power and management resources are shared with other functions? boundary
Signal path and compatibility Describes the physical attachments and signal capabilities needed for a usable modem link.
A matching connector does not establish electrical, radio, protocol or peer compatibility.
Physical attachments
Identifies host, medium, antenna and power connections with their relevant constraints.
Connection role and rating
Record each attachment by function and documented compatibility requirements.
- Which interfaces carry host data, medium signals, antenna signals, management traffic and power? definition
- Which cable, impedance, voltage, antenna or bus-power requirements must be satisfied before attachment? action
Supported link profiles
Captures the specifications and operating profiles that determine communication compatibility.
Peer and profile match
Record compatible link families, profiles and peer requirements with applicability evidence.
- Which specification identifiers, issuing bodies, revisions and profiles describe the supported link? provenance
- Which frequency ranges, modulation and coding options, duplex modes or channel combinations must match the intended peer? boundary
- Which capability limits depend on hardware revision, firmware, region or provider configuration? boundary
Link establishment and provisioning Tracks the prerequisites and stages between power-up and a link ready to carry data.
Signal acquisition, link synchronisation, network acceptance and usable data service are distinct conditions.
Service prerequisites
Identifies credentials, registrations and peer settings required by the particular modem family.
Identity and service acceptance
Record applicable provisioning dependencies using credential references rather than secret values.
- Does this link require subscriber credentials, a SIM or eSIM profile, device registration, dial parameters or another provisioning mechanism? definition
- Which prerequisites can the local operator change, and which require the provider or remote peer? action
Connection state progression
Maps reported indicators and events to the stages of link establishment and loss.
State and readiness evidence
Record the actual device state vocabulary and evidence for readiness without relying solely on indicator colour.
- Which reported states distinguish acquisition or training, synchronisation, registration and readiness to carry data for this modem? definition
- What observation confirms modem-link readiness separately from host addressing and remote-service reachability? measurement
- Which failed transition is reported, and what retry or reconnection action is documented for it? action
Link quality and fault isolation Connects performance observations and error history to the modem link and its dependencies.
Slow or interrupted communication can arise from signal conditions, provisioning, the host or the wider network, requiring evidence that distinguishes these causes.
Capacity and signal observations
Records directional link rates and medium-specific signal metrics with measurement context.
Rate and quality interpretation
Keep advertised limits, negotiated link rates and observed throughput distinct.
- What are the current transmit and receive link rates in bit/s, and what overhead or aggregation does each reported rate include? measurement
- Which signal metrics does this modem expose, in which units and for which channels and directions? measurement
- What documented reference supports interpreting these metrics for this link family and operating profile? provenance
Errors and interruptions
Uses counters, retraining events, disconnections and controlled checks to narrow fault causes.
Fault localisation evidence
Associate symptoms with time-bounded observations before assigning a cause or performing disruptive recovery.
- Which error, retransmission, retraining or disconnection events occurred, over what interval and since which counter reset? measurement
- Which observations distinguish a medium fault from power instability, host-interface failure, provisioning rejection or an upstream outage? boundary
- Which documented diagnostic check can narrow the cause, and will it interrupt the active link? action
Configuration and service lifecycle Governs management access, changes, installation conditions and recovery throughout modem use.
Modem changes can remove connectivity or provisioning, while physical installation and lifecycle state affect reliable and permitted operation.
Management and recovery
Identifies management authority and the effects of firmware, profile and reset operations.
Controlled modem changes
Record who controls settings and how service can be recovered after an authorised change.
- Which local, host-mediated or provider-controlled management interfaces exist, and who may use them? action
- Which firmware and configuration versions are active, and what source establishes their compatibility with this hardware and service? provenance
- How do reconnect, reboot, factory reset and firmware update differ in service interruption, retained settings and recovery requirements? action
Installation and retirement
Captures modem-specific physical constraints, approval evidence and removal from service.
Safe installation and decommissioning
Record applicable supply, ventilation, line or antenna constraints and the steps needed to retire a provisioned modem.
- Which documented power, temperature, ventilation, line-protection or antenna-installation limits apply to this modem variant? provenance
- Which certification marks or approval records apply to this hardware, link technology and intended jurisdiction? provenance
- Before replacement or disposal, which credentials, SIM or eSIM profiles, provider bindings and stored settings require removal or transfer? action
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.
- This entry covers the device class, including embedded modem subsystems, rather than a particular product or physical unit.
- Standards and identifiers are recalled without source consultation; their applicable editions and technology-specific requirements need verification.
- Line rates are not application throughput; modern DSL, cable, cellular and satellite capacities require technology- and deployment-specific treatment.
- Which of these check these first hold for the sense of modem this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Voice-band dial-up modem
- DSL modem
- Cable modem
- Cellular modem
- Satellite modem
- Short-range radio modem
- Which of these kinds and varieties hold for the sense of modem this model covers, and on what evidence? provenance
Identifiers and schemes
Recalled without web access and unsourced; every item is a lead to verify.
- Manufacturer model number and serial number - Manufacturer-specific strings - The model number identifies a product design; the serial number identifies an individual unit.
- IMEI - 15 decimal digits - Identifies cellular equipment; applicable to many cellular modems, not to modems generally.
- IEEE MAC address - 48-bit address, commonly written as six hexadecimal octets - Identifies applicable network interfaces, including cable-modem interfaces; a device may have multiple addresses.
- Which of these identifiers and schemes hold for the sense of modem 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 Recommendation V.92 specifies enhancements for voice-band modems supporting downstream rates up to 56 kbit/s.
- ITU-T Recommendation G.992.1 specifies asymmetric digital subscriber line (ADSL) transceivers.
- ITU-T Recommendation G.993.2 specifies very-high-speed digital subscriber line transceivers 2 (VDSL2).
- CableLabs DOCSIS specifications govern data transmission and interoperability for cable modems.
- 3GPP specifications define cellular radio technologies and protocol requirements used by cellular modems.
- Which of these standards and regulation hold for the sense of modem this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Providing household and business internet access over telephone pairs or cable networks
- Connecting computers and embedded systems to cellular data networks
- Providing satellite data links at remote sites
- Carrying telemetry and industrial monitoring data over radio links
- Supporting legacy dial-up data connections
- Which of these real-world use hold for the sense of modem this model covers, and on what evidence? provenance
Typical measurements
Recalled without web access and unsourced; every item is a lead to verify.
- Negotiated downstream line rate for later-generation voice-band dial-up modems - Approximately 28.8-56, depending on line conditions and network support - kbit/s
- Nominal downstream line-rate capability of G.992.1 ADSL - Up to approximately 8; actual service rates depend on loop length, noise and provisioning - Mbit/s
- Which of these typical measurements hold for the sense of modem 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.
- Noise, attenuation or interference can cause errors, reduced negotiated rates and loss of synchronization.
- Incompatible protocols, provisioning or authentication settings can prevent connection despite intact hardware.
- Power-supply faults and overheating can cause resets or permanent failure.
- Lightning-induced surges on power, telephone or coaxial connections can damage equipment and create electrical hazards.
- Vulnerable firmware or exposed management interfaces can permit unauthorized access or disruption.
- Which of these failure modes and hazards hold for the sense of modem this model covers, and on what evidence? provenance
Regional variation
Recalled without web access and unsourced; every item is a lead to verify.
- Cellular frequency bands and operator certification requirements vary by country and network.
- Telephone-network interfaces and DSL deployment profiles vary among operators and regions.
- Cable-network channel plans and DOCSIS deployment generations vary among operators and regions.
- Which of these regional variation hold for the sense of modem 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.
- Router - A router forwards packets between networks; a modem performs modulation and demodulation for a communications link, although one product can contain both.
- Network switch - A switch forwards frames among network ports; this forwarding role does not itself make it a modem.
- Transceiver - A transceiver both transmits and receives; a modem specifically encodes and recovers data through modulation and demodulation.
- Wi-Fi access point - An access point connects wireless stations to a local network; products combining it with a modem perform two distinct roles.
- Optical network terminal - An optical network terminal terminates a passive optical access network and its associated protocols; calling it a modem is common informally but does not specify that network role.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of modem this model covers, and on what evidence? provenance
What the second pass must settle
- Does an existing Vercy world model already cover modem, requiring this registry entry to link to that source of truth?
- Where should this registry draw the modem boundary for optical network terminals, Ethernet physical-layer devices, software-defined radios and host-based softmodems?
- Which link-family specifications and issuing bodies should anchor researched profiles for telephone-band, DSL, cable, cellular and other radio modems?
- Which signal metrics, reference ranges, rate definitions and fault indicators can be supported by primary documentation for each link family?
- Which representative device documents establish typical capacities, dimensions, maintenance needs and jurisdiction-specific approvals without generalising product-specific claims to all modems?