Glossary

A working vocabulary for
connectivity decisions.

Definitions of the terms we use most often in our work and our writing. Organised by topic rather than alphabetically, so you can read across a cluster of related concepts. Written for engineering leaders, product managers, and operators making architectural decisions, not as an academic reference.

SIM technology and provisioning

The physical and logical mechanisms by which a device authenticates itself to a cellular network. The most consequential and fastest-moving area of IoT connectivity architecture.

SIM (Subscriber Identity Module): The credential a device presents to a cellular network to prove its identity and authorization to use the network. Originally a physical card; now exists in multiple physical and embedded forms.
eSIM (embedded SIM): A SIM physically integrated into a device rather than removable. The hardware is permanent; the credentials it carries can be updated remotely.
eUICC (Embedded Universal Integrated Circuit Card): The technical standard underlying eSIM. An eUICC can hold and switch between multiple operator profiles, enabling a single device to move between carriers without hardware changes.
Profile lifecycle: The sequence of operations that a connectivity profile undergoes: creation, distribution to devices, activation, suspension, transfer between operators, and eventual retirement. The mechanics of profile lifecycle have evolved significantly over the last decade and continue to change.
Operator-orchestrated provisioning: A model in which a carrier or its agents pushes profile changes to devices in the field. Was the dominant model for early eUICC deployments.
Device-orchestrated provisioning: A model in which the device itself initiates and manages profile changes, communicating directly with provisioning servers. Reduces operator dependency and enables more flexible commercial relationships.
In-line provisioning: Provisioning workflows integrated directly into the device manufacturing process, with credentials generated and loaded as part of factory production rather than after deployment. The most operationally significant shift bundled with the latest generation of eUICC standards.

Carrier relationships and topologies

The commercial and technical structures through which a device connects to one or more cellular networks. The architectural choices here have decade-long downstream consequences.

Single-carrier topology: A device or fleet that connects through one carrier exclusively. Simplest to manage, most exposed to that carrier's pricing, coverage, and policy decisions over time.
Multi-carrier topology: A device or fleet able to connect through more than one carrier. Provides commercial leverage and coverage redundancy, at the cost of additional integration and orchestration complexity.
Connectivity orchestration: The technical layer that decides, in real time or by policy, which network a device should attach to and when. Required to make multi-carrier topologies work in practice.
MVNO (Mobile Virtual Network Operator): An operator that resells capacity from one or more underlying mobile network operators rather than running its own radio network. Common intermediary in IoT connectivity arrangements.
Aggregator: A commercial intermediary that consolidates connectivity from multiple carriers into a single contract and platform. Useful for global deployments where direct relationships with each carrier would be impractical.
Connectivity Management Platform (CMP): The operational software through which a fleet operator manages SIMs, monitors usage, configures policies, and integrates with billing. The CMP is a major and often underestimated architectural choice.

Standards and regulation

The institutional frameworks within which IoT connectivity operates. Standards bodies move slowly but decisively; regulatory regimes vary by geography and impose hard constraints on architecture.

GSMA (GSM Association): The industry body representing mobile network operators worldwide. Sets specifications for SIM technology, eUICC, and other foundational connectivity standards.
Certification: The formal process of validating that a device meets regulatory and operator requirements for use on cellular networks. Includes regulatory programs (FCC in the US, IC in Canada, CE in the EU) and operator-specific certification processes.
Type approval: A regulatory designation indicating a device has been formally tested and approved for sale in a given market. Required in most jurisdictions before a connected product can be deployed at scale.

Architectural concepts

Higher-order ideas that shape how connectivity decisions interact with product strategy and lifecycle.

Long-lived devices: IoT devices designed to remain in service for many years or decades. Long service life amplifies the consequences of every architectural decision made before deployment.
Lifecycle gap: The mismatch between the service life of a deployed device and the half-life of the connectivity environment around it. The source of more avoidable cost in IoT than any single technology choice.
Connectivity layer: The portion of an IoT architecture concerned with how devices reach the network. Distinct from the application layer, the device firmware, and the cloud-side platforms, though dependent on all three.
Programmable connectivity: A general descriptor for connectivity arrangements in which credentials, policies, and topologies can be modified after device deployment, rather than being fixed at manufacturing time.
Frontier (in this context): The leading edge of standards, vendor offerings, and commercial structures in the connectivity space. Moves continuously; the gap between the frontier and a deployed architecture widens over time.

Emerging connectivity

Newer or rapidly evolving categories that increasingly intersect with traditional cellular IoT.

Non-terrestrial networks (NTN): Cellular connectivity delivered via satellite or other non-ground-based infrastructure. Increasingly relevant for IoT deployments in remote or maritime environments, with the line between terrestrial and non-terrestrial blurring as standards converge.
Direct-to-device satellite: A subset of NTN in which standard cellular devices connect directly to satellites without specialised hardware. A meaningful operational shift currently rolling out commercially.
Private cellular network: A cellular network deployed and operated for the exclusive use of a single organisation, often using licensed or unlicensed spectrum at a specific facility. Increasingly relevant for industrial IoT with stringent reliability or coverage requirements.

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