Telecoms & IoT Glossary
The Stacuity Glossary is your go-to resource for understanding the technology behind modern mobile connectivity.
Telecoms & IoT Glossary
The Stacuity Glossary is your go-to resource for understanding the technology behind modern mobile connectivity.
Looking for clear definitions of complex telecom and IoT terms? The Stacuity Glossary is your go-to resource for understanding the technology behind modern mobile connectivity.
From APNs to core network architecture, find the exact technical breakdowns you need to build, scale, and manage your connected devices with confidence.
Network Architecture & Core Infrastructure
Core Network
The centralised architectural segment of a network, such as the Evolved Packet Core (EPC) in 4G or the 5G Core (5GC), that manages control plane and user plane traffic. It orchestrates critical network functions including subscriber data management (via HSS/UDM), session management, policy enforcement, and gateway anchoring to external Packet Data Networks.
Control Plane
The part of a network architecture that handles the administration, routing logic, and brainpower of the system. It is responsible for making decisions about where data traffic should be sent, establishing connections, managing security policies, and configuring routing tables, without actually carrying the user data itself.
User Plane
Programmable Network
A network where software control planes are separated from physical hardware, allowing network functionality and traffic routing to be automated and customised using APIs.
Software-Defined Network (SDN)
An architectural approach to networking that uses software-based controllers or APIs to direct traffic and manage the network, centrally abstracting the control plane from the underlying physical hardware.
Software-Defined Mobile Network (SDMN)
A modern mobile network approach that applies Software-Defined Networking (SDN) concepts to cellular infrastructure. It decouples the network’s brain (the control software) from its physical hardware (routers and base stations), allowing operators to configure, scale, and optimise their 4G and 5G cellular networks through central software updates rather than manual hardware changes.
Distributed Network
A network architecture where computer processing, data storage, and control are spread across multiple interconnected nodes or locations rather than relying on a single, centralised server. This setup eliminates single points of failure, ensuring high availability, fault tolerance, and the ability to scale resources dynamically.
A network architecture that positions computing power, data storage, and applications closer to the actual users and devices producing the data, rather than relying entirely on distant, centralised cloud data centres. By processing data locally, it drastically reduces latency, saves bandwidth, and enables real-time device responsiveness.
Gateways, Routing & Traffic Management
Packet Gateway (P-GW)
The component of a mobile core network responsible for routing user data traffic. It acts as the interface between the mobile core and external data networks like the internet or private enterprise clouds. It manages device IP allocation, data routing, and policy enforcement.
A software-based version of a traditional packet gateway that runs on cloud infrastructure to route mobile data traffic, offering greater scalability, flexibility, and cost-efficiency than legacy hardware.
The gateway setting that configures a path between a mobile or IoT device and the cellular carrier’s network. It acts as a set of instructions that tells the device exactly how to route data traffic, assign IP addresses, and handle security protocols to establish an active internet connection
Private APN (Access Point Name)
A custom gateway that connects a mobile or IoT device directly to a secure, private corporate network over a cellular carrier’s infrastructure. By bypassing the public internet, it ensures that data transmitted by field devices is securely routed directly into an enterprise’s private cloud or internal data
APN Network
A dedicated data network segment established within a mobile network operator’s (MNO) packet core (SGW/PGW). It uses specific Access Point Names to segregate device traffic into distinct logical networks, enforcing custom Quality of Service (QoS) parameters, firewalls, and routing protocols tailored to specific enterprise or consumer service tiers.
IPsec (Internet Protocol Security)
A secure suite of networking protocols used to encrypt and authenticate data packets sent over an internet connection. It establishes a highly secure, private tunnel between two devices or networks (such as a remote office and a corporate data center), ensuring that the data being transmitted cannot be intercepted or tampered with by hackers.
Local Data Breakout
A routing method that processes a device’s data traffic within its current geographic region. By eliminating the need to send data back to a distant home network, local breakout significantly reduces latency and helps enterprises comply with regional data localisation laws.
Connectivity Standards & Signaling
5G SA (Standalone)
The definitive architectural model for 5G where both the radio towers and the backbone core network are built natively on 5G standards. Unlike early Non-Standalone (NSA) deployments that anchored to a 4G core, 5G SA enables revolutionary enterprise features like end-to-end network slicing and Ultra-Reliable Low-Latency Communication (URLLC).
VoLTE (Voice over LTE)
A digital network standard that allows voice calls to be transmitted as data packets over a 4G LTE cellular network. By replacing older 2G and 3G circuit-switched networks, it enables high-definition (HD) voice quality, faster call setup times, and the ability to use high-speed cellular data simultaneously while on a call.
GSM Signaling
The backbone communication framework used in GSM cellular networks to manage and coordinate connections between mobile devices and the network infrastructure. It handles essential background tasks, such as call setup, text message routing, user authentication, and location tracking, without carrying the actual voice or data payload itself.
IPX (IP eXchange)
A secure, private, and high-performance telecommunications network model used by mobile operators to exchange IP-based traffic between different networks. It acts as an isolated global gateway that allows carriers to route international data, VoLTE roaming calls, and text messages between each other with guaranteed quality, bypassing the public internet entirely.
Low Latency
A state of high-speed network performance where data transmission experiences minimal delay. It measures the brief fraction of a second it takes for a data packet to travel from its source to its destination and back, making it critical for real-time applications.
Transmission Protocol
A standardized set of rules and formatting guidelines that dictates how data is packaged, addressed, transmitted, and received across a network. It acts as a universal language for connected hardware, ensuring that different types of computers and devices can exchange information accurately, securely, and without data corruption.
IoT & Low-Power Frameworks
IoT (Internet of Things)
A vast network of physical objects—such as smart appliances, industrial sensors, vehicles, and medical devices, that are embedded with electronics, software, and sensors. This allows them to collect data, connect to the internet, and exchange information with other systems over a network without requiring direct human interaction.
AIoT (Artificial Intelligence of Things)
The fusion of artificial intelligence (AI) technologies with the Internet of Things (IoT) infrastructure. It elevates standard connected devices from passive data collectors into intelligent systems capable of analysing data, learning from patterns, and making autonomous decisions in real time without human intervention.
LPWAN (Low-Power Wide-Area Network)
A category of wireless telecommunication networks designed specifically for the Internet of Things (IoT). They provide long-range communication (often stretching over several kilometres) and ultra-low power consumption, allowing battery-powered sensors and devices to operate in the field for up to a decade.
Narrowband IoT (NB-IoT)
A 3GPP cellular standard that operates on a narrow bandwidth (180 kHz). By limiting data throughput to small packets, it drastically reduces device power consumption, lowers hardware costs, and provides up to a 20 dB signal boost over standard GSM, allowing connectivity deep underground or inside thick concrete buildings.
SIM Technology, Remote Provisioning & Hardware Security
UICC
The secure smart card chip in mobile devices that runs network authentication applications (like USIM) to verify identity and establish a secure connection to a mobile network.
Embedded SIM (eSIM)
A hardware-secure chip (eUICC) embedded in a cellular module that supports remote provisioning. This allows IoT devices deployed globally to switch network carriers or update connectivity profiles remotely via software, bypassing the need to physically replace SIM cards in the field. (Takes up small but dedicated board space, standard in smartphones and wearables).
iSIM (Integrated SIM)
The next generation of SIM technology where subscriber identity and authentication functions are integrated directly into a device’s primary system-on-a-chip (SoC) processor. By eliminating the need for a separate physical card or soldered eSIM chip, it drastically reduces hardware footprint (<1 mm² inside the processor ) and power consumption (up to 70% more power-efficient than eSIM ). Built for ultra-compact, battery-powered IoT devices.
SGP.32
The GSMA technical specification for eSIM remote SIM provisioning designed specifically for the Internet of Things (IoT). It allows enterprises to remotely download, activate, and manage mobile operator profiles in bulk across large fleets of “headless” devices without requiring manual user interaction or physical SIM swaps.
Multi-IMSI
A technology that allows a single SIM or eSIM to store multiple International Mobile Subscriber Identities (IMSIs). It is widely used in global IoT deployments to bypass permanent roaming restrictions, reduce data latency, and ensure network redundancy by switching to a domestic carrier automatically.
Dual Carrier
A connectivity configuration—typically powered by Multi-IMSI or eSIM technology—that provisions two independent mobile network profiles on a single SIM. It is primarily used to provide automatic failover and network redundancy for mission-critical IoT devices.
Locked IMEI
A cellular module or device identity that a carrier has locked to its specific network, preventing it from accepting SIM profiles from alternative operators. In global IoT, deploying devices with locked IMEIs can severely limit network flexibility, cross-border mobility, and carrier redundancy.
Interoperability
The capability of diverse cellular modules, SIM cards, cloud platforms, and mobile network cores to work together using standardised protocols (like GSMA standards or MQTT). This ensures that an enterprise’s IoT hardware can switch networks or transfer data smoothly without requiring a total hardware redesign.
Cloud Services and Compliance Models
Infrastructure as a Service (IaaS)
A cloud model that allows developers and enterprises to provision and scale virtual servers, storage, and networks on demand via APIs or dashboards. This eliminates the need to buy, rack, or maintain physical data centre hardware.
Software as a Service (SaaS)
A cloud computing model where a software application is hosted centrally by a provider and delivered to users over the internet, typically accessed via a web browser or API on a subscription basis.
Network as a Service (NaaS)
A model that delivers virtualised telecom and connectivity functions over the cloud. It allows developers and enterprises to provision network resources, configure routing paths, and deploy security features instantly via software APIs or dashboards.
Data Localisation
The regulatory or technical requirement that data generated by mobile and IoT devices must be stored, processed, and routed within the geographical borders of its country of origin, often requiring local network gateways rather than international routing.
Permanent Roaming
A deployment scenario where a cellular device remains continuously connected to a mobile network outside of its home country for an extended period, typically longer than 90 days. Because many international telecom regulators and local carriers ban permanent roaming to prevent network congestion and tax evasion, enterprises often use eSIMs or Multi-IMSI technology to localize device profiles and maintain compliance.

