nRF Connect Cellular Monitor v1.0.4 or later


The glossary contains terms and acronyms that are used in this document.

AT command

A command used to control the modem.

AT command

Certificate Authority (CA)

A trusted third-party organization that acts to validate the identity of entities (such as IOT devices and websites) and bind them to cryptographic keys using electronic documents known as digital certificates.



NB-IoT User Equipment (UE) category with 200 kHz UE bandwidth and a single RX antenna, specified in 3GPP Release 13.


An upgraded version of Cat-NB1, specified in 3GPP Release 14.

Development Kit (DK)

A hardware development platform used for application development.


Internet Protocol (IP)

The network layer communications protocol in the Internet protocol suite for relaying datagrams across network boundaries. Its routing function enables internetworking, and essentially establishes the Internet.


Long-Term Evolution (LTE)

A wireless broadband communication standard for mobile devices and data terminals, based on the GSM/EDGE and UMTS/HSPA technologies. 



An open standard that is most suitable for medium throughput applications requiring low power, low latency, and/or mobility, like asset tracking, wearables, medical, POS, and home security applications. Also known as Cat-M1.


A cloud-based platform for connected device monitoring, debugging, and updating.

Non-access Stratum (NAS)

In telecom protocol stacks, the highest stratum of the control plane between the core network and User Equipment (UE). The layer is used to manage the establishment of communication sessions and for maintaining communications with the UE as it moves.


Narrowband Internet of Things (NB-IoT)

A narrowband technology standard with longer range, lower throughput, and better penetration in, for example, cellars and parking garages compared to LTE-M. NB-IoT is most suitable for static, low throughput applications like smart metering, smart agriculture, and smart city applications. Also known as Cat-NB1 or Cat-NB2.


nRF Cloud

Nordic Semiconductor's platform for connecting IoT devices to the cloud, viewing and analyzing device message data, prototyping ideas that use Nordic Semiconductor chips, and more. It includes a public REST API that can be used for building IoT solutions. See nRF Cloud portal (

Packet Capture Next Generation (PcapNG)

The default file format for Wireshark.


Packet Data Network (PDN)

A network that provides data services.


Radio Resource Control (RRC)

A protocol used in UMTS, LTE, and 5G on the radio interface. It is an OSI model network layer 3 protocol used between the User Equipment and Base Station.


Real Time Transfer (RTT)

A proprietary technology for bidirectional communication that supports J-Link devices and ARM-based microcontrollers, developed by SEGGER Microcontroller.


System in Package (SiP)

Several integrated circuits, often from different technologies, enclosed in a single module that performs as a system or subsystem.


Subscriber Identity Module (SIM)

A card used in UE containing data for subscriber identification.


System on Chip (SoC)

A microchip that integrates all the necessary electronic circuits and components of a computer or other electronic systems on a single integrated circuit.


Universal Asynchronous Receiver/Transmitter (UART)

A hardware device for asynchronous serial communication between devices.


User Equipment (UE)

Any device used by an end-user to communicate. The UE consists of the Mobile Equipment (ME) and the Universal Integrated Circuit Card (UICC).


Universal Serial Bus (USB)

An industry standard that establishes specifications for cables and connectors and protocols for connection, communication, and power supply between computers, peripheral devices, and other computers.



A free software tool that captures wireless traffic and reproduces it in a readable format. It is a cross-platform network protocol analyzer that can be used to view, analyze, and troubleshoot packets sent over a data network.