Telecom Abbreviations
114 abbreviations · part of Technology & Computer Abbreviations
Abbreviations from mobile phones and telecommunications: text and multimedia messaging, cellular generations and standards, SIM cards and device identifiers, carriers and network equipment, landline telephony, broadband over copper, cable, fiber and satellite, Wi-Fi generations, short-range wireless and satellite positioning. Most cellular standards are written by 3GPP and approved through the International Telecommunication Union, while Wi-Fi standards come from the IEEE 802.11 working group. Entries explain what each term means for phone and internet users as well as for engineers.
| Abbreviation | Stands for | Description |
|---|---|---|
| 10DLC | 10-digit long code | US system for sending business text messages from ordinary 10-digit phone numbers, requiring companies to register their brand and messaging campaigns with carriers in… |
| 1G | First generation of mobile telephony | Analog cellular phone systems of the 1980s, which carried voice only, with no encryption and no data services. |
| 2G | Second generation of mobile telephony | Digital cellular networks introduced in the early 1990s, led by GSM, that added encryption, SMS text messaging and later basic data services. 2G remains in use in some… |
| 3G | Third generation of mobile telephony | Mobile networks that brought practical mobile internet, video calls and app downloads to phones in the 2000s, using technologies such as UMTS/W-CDMA and CDMA2000 with… |
| 3GPP | 3rd Generation Partnership Project | Collaboration of seven regional telecom standards organizations that writes the global specifications for mobile networks, including UMTS, LTE, 5G and the coming 6G. |
| 4G | Fourth generation of mobile telephony | Mobile broadband standard based mainly on LTE, delivering typical download speeds of tens of megabits per second and enabling video streaming, video calling and… |
| 5G | Fifth generation of mobile telephony | Current cellular standard designed for much higher speeds, lower latency and many more connected devices than 4G, using low-band, mid-band and millimeter-wave spectrum. |
| 6G | Sixth generation of mobile telephony | Next cellular generation under development, expected to launch commercially around 2030, with goals including higher capacity, very low latency, AI-native network… |
| 802.11ac | IEEE 802.11ac (Very High Throughput Wi-Fi) | Wi-Fi standard approved in 2013, later branded Wi-Fi 5, that operates in the 5 GHz band with wider channels of up to 160 MHz and 256-QAM modulation. |
| 802.11ax | IEEE 802.11ax (High Efficiency Wi-Fi) | IEEE wireless networking standard marketed as Wi-Fi 6 and Wi-Fi 6E, designed for high efficiency in dense environments such as apartments, offices, stadiums and airports. |
| 802.11be | IEEE 802.11be (Extremely High Throughput Wi-Fi) | IEEE amendment behind Wi-Fi 7, adding 320 MHz channels, 4096-QAM, multi-link operation and better handling of interference through preamble puncturing. |
| 802.11n | IEEE 802.11n (High Throughput Wi-Fi) | Wi-Fi standard ratified in 2009, later branded Wi-Fi 4, that introduced MIMO antennas and 40 MHz channels in both the 2.4 and 5 GHz bands, reaching up to 600 Mbit/s in… |
| A2P | Application-to-person | Text messages sent automatically by software to people, such as one-time passcodes, delivery updates, bank alerts and appointment reminders, as opposed to… |
| ADSL | Asymmetric digital subscriber line | Most common form of DSL broadband, providing faster download than upload speeds over copper phone lines, up to about 8 Mbit/s for original ADSL and 24 Mbit/s for ADSL2+. |
| AM | Amplitude modulation | Method of transmitting audio by varying the strength (amplitude) of a radio carrier wave, used by AM broadcast radio on medium-wave frequencies, as well as by aviation… |
| AMPS | Advanced Mobile Phone System | Analog first-generation cellular standard developed by Bell Labs and launched in Chicago in October 1983, the basis of early mobile phone service in North America and… |
| APN | Access Point Name | Setting on a phone or modem that identifies the gateway between the mobile network and the internet or a private network, determining how data and MMS connect. |
| ARPU | Average revenue per user | Key financial measure in telecom and online services, calculated as total revenue divided by the number of subscribers over a period, usually a month. |
| BT | British Telecom (BT Group) | Largest telecommunications company in the United Kingdom, providing broadband, landline, mobile and TV services, and owner of Openreach, which runs much of the… |
| BTS | Base transceiver station | Radio equipment at a cell site that communicates directly with mobile phones, in GSM terminology. |
| CBRS | Citizens Broadband Radio Service | US shared spectrum band from 3.55 to 3.7 GHz, managed by a three-tier system that protects incumbent Navy radar while allowing licensed and unlicensed use for 4G and 5G… |
| CDMA | Code-division multiple access | Radio technique, and the family of cellular standards built on it, in which many users share the same frequencies simultaneously by giving each transmission a unique… |
| CLI | Calling line identification | British and European term for caller ID, the transmission of the caller's phone number to the person being called. |
| CPE | Customer premises equipment | Telecom equipment located at the customer's home or business rather than in the provider's network, such as modems, routers, optical network terminals, set-top boxes… |
| DAB | Digital Audio Broadcasting | Digital radio standard that transmits many stations in a single multiplex, offering clearer sound without hiss, station names and text information on the display. |
| DECT | Digital Enhanced Cordless Telecommunications | Standard for cordless home and office phones and headsets, operating in a dedicated band around 1.9 GHz so it does not interfere with Wi-Fi. |
| DOCSIS | Data Over Cable Service Interface Specification | Standard that allows high-speed internet over cable TV coaxial networks, used by cable providers such as Comcast, Charter, Virgin Media and Rogers. |
| DSL | Digital subscriber line | Family of technologies that deliver internet access over ordinary copper telephone lines, sharing the line with voice calls by using higher frequencies. |
| DTMF | Dual-tone multi-frequency | Signaling system that represents each phone keypad button with a combination of two simultaneous tones, used for dialing and for navigating automated phone menus. |
| E911 | Enhanced 911 | US emergency calling system that automatically sends the caller's phone number and location to 911 dispatchers, rather than relying on the caller to describe where they… |
| EDGE | Enhanced Data rates for GSM Evolution | Upgrade to GSM networks that roughly tripled data speeds over GPRS, reaching a few hundred kilobits per second at best. |
| EE | EE Limited | UK mobile network operator, owned by BT Group, formed in 2010 by merging the British operations of Orange and T-Mobile. |
| eNB | Evolved Node B | Base station of a 4G LTE network, also written eNodeB, which handles radio communication with phones and many control functions that earlier generations placed in… |
| eSIM | Embedded SIM | SIM chip built into a phone, watch, tablet or laptop that can be programmed remotely with a carrier profile, replacing the removable plastic card. |
| EV-DO | Evolution-Data Optimized | 3G mobile data standard for CDMA2000 networks, used by Verizon, Sprint and other CDMA carriers in the 2000s. |
| FDD | Frequency-division duplex | Method of two-way radio communication in which uplink and downlink use separate paired frequencies at the same time. |
| FM | Frequency modulation | Method of transmitting audio by varying the frequency of a radio carrier wave, giving clearer, less noisy sound than AM. |
| FTTC | Fiber to the cabinet | Broadband architecture in which fiber runs to a street cabinet and the final few hundred meters to the home use existing copper telephone lines with VDSL, giving speeds… |
| FTTH | Fiber to the home | Broadband network in which optical fiber runs all the way into each home, offering symmetrical gigabit speeds and beyond, low latency and high reliability. |
| FTTP | Fiber to the premises | Network architecture with optical fiber running directly to the building, whether a home or a business, covering both FTTH and fiber to the business. |
| FWA | Fixed wireless access | Home or business broadband delivered over radio to a fixed receiver instead of cables, most often using 4G or 5G cellular networks or dedicated point-to-point links. |
| gNB | Next-generation Node B | Base station of a 5G New Radio network, also written gNodeB, which connects phones to the 5G core over NR radio. |
| GNSS | Global Navigation Satellite System | General term for satellite navigation systems with worldwide coverage: the US GPS, Russia's GLONASS, the European Union's Galileo and China's BeiDou. |
| GPRS | General Packet Radio Service | Packet-switched data service added to GSM networks around 2000, giving phones always-on mobile internet at speeds of tens of kilobits per second. |
| GPS | Global Positioning System | US satellite navigation system that lets receivers anywhere on Earth calculate their position, speed and precise time from signals broadcast by a constellation of about… |
| GSM | Global System for Mobile Communications | Digital cellular standard behind most of the world's 2G networks, introducing SIM cards, encrypted calls, international roaming and SMS. "GSM unlocked" phones work with… |
| GSMA | GSM Association | Industry organization representing mobile network operators worldwide, along with device makers and other companies. |
| HFC | Hybrid fiber-coaxial | Cable network architecture that carries signals over fiber to neighborhood nodes and over coaxial cable for the final distance to homes, delivering cable TV and… |
| HSPA | High Speed Packet Access | Upgrade to 3G UMTS networks that greatly increased data speeds, combining HSDPA for downloads and HSUPA for uploads. |
| ICCID | Integrated Circuit Card Identifier | Serial number of a SIM card, typically 19 or 20 digits, printed on the card and stored in its chip. |
| IMEI | International Mobile Equipment Identity | Unique 15-digit number assigned to every mobile phone and cellular device, used by networks to identify the handset and to block phones reported lost or stolen. |
| IMS | IP Multimedia Subsystem | Architecture in mobile and fixed networks that delivers voice, video and messaging over internet protocol using SIP signaling. |
| IMSI | International Mobile Subscriber Identity | Unique number of up to 15 digits stored on a SIM card that identifies a mobile subscriber to the network, made up of a country code, a network code and a subscriber… |
| ISDN | Integrated Services Digital Network | Digital telephone service standard that carries voice and data over ordinary copper lines in 64 kbit/s channels. |
| IVR | Interactive voice response | Automated phone system that greets callers, offers menus and collects input by keypad or speech, routing calls or completing tasks such as balance checks and payments… |
| LEO | Low Earth orbit | Orbit up to about 2,000 kilometers above Earth's surface, where satellites circle the planet in roughly 90 to 127 minutes. |
| LTE | Long Term Evolution | Fourth-generation mobile broadband standard developed by 3GPP that delivers high-speed data over an all-IP network, the technology behind most "4G" service worldwide. |
| LTE-A | LTE-Advanced | Upgrade of LTE, standardized in 3GPP Release 10, that combines multiple frequency bands through carrier aggregation and uses more antennas to raise speeds. |
| LTE-M | LTE for machines (LTE Cat-M1) | Low-power cellular technology for Internet of Things devices that need moderate data rates, mobility and even voice, such as asset trackers, wearables, alarm panels and… |
| MCC | Mobile country code | Three-digit code identifying the country of a mobile network, combined with a mobile network code (MNC) to identify each operator worldwide. |
| MIMO | Multiple-input multiple-output | Radio technique that uses multiple antennas at both transmitter and receiver to send several data streams simultaneously over the same frequency, multiplying speed and… |
| MMS | Multimedia Messaging Service | Extension of SMS that sends photos, short videos, audio clips, longer text and group messages over the cellular network. |
| mmWave | Millimeter wave | Radio frequencies roughly between 24 and 100 GHz, used by 5G for multi-gigabit speeds over short distances. |
| MNO | Mobile network operator | Company that owns or controls radio spectrum licenses and the network infrastructure to provide mobile phone service directly to customers, such as Verizon, AT&T… |
| modem | Modulator-demodulator | Device that converts digital data into signals suited to a transmission medium, such as telephone lines, cable TV coax or fiber, and back again. |
| MSISDN | Mobile Station International Subscriber Directory Number | Technical name for a mobile phone number in full international format, including the country code, as used inside carrier systems and billing platforms. |
| MVNO | Mobile virtual network operator | Mobile service provider that sells phone plans using another company's network rather than owning radio infrastructure. |
| MWC | Mobile World Congress | World's largest annual mobile industry trade show, held in Barcelona each February or March and organized by the GSMA. |
| NB-IoT | Narrowband Internet of Things | Low-power cellular technology for devices that send small amounts of data infrequently, such as smart meters, parking sensors and asset trackers, offering deep indoor… |
| NFC | Near-field communication | Short-range wireless technology that lets devices exchange data when held within a few centimeters, used for contactless payments with phones and watches, transit… |
| NR | New Radio | Name of the 5G radio interface standardized by 3GPP, covering how phones and base stations communicate over the air. |
| OFDM | Orthogonal frequency-division multiplexing | Modulation method that splits a radio channel into many closely spaced subcarriers carrying data in parallel, which resists interference and signal reflections. |
| ONT | Optical network terminal | Device installed in a home or business that converts light signals on a fiber-optic line into electrical signals for an Ethernet connection to a router. |
| OTT | Over-the-top | Services delivered over the internet directly to users, bypassing the traditional control of telecom carriers or cable operators, such as WhatsApp for messaging and… |
| PAYG | Pay as you go | Prepaid mobile plan, especially in the UK and Ireland, in which customers buy credit or bundles in advance rather than receiving a monthly bill. |
| PBX | Private branch exchange | Business telephone system that connects internal extensions, lets staff call each other for free and shares a smaller number of external lines, with features such as… |
| PON | Passive optical network | Fiber-optic access network that uses unpowered optical splitters to share one fiber from the provider among many homes, typically 32 or 64. |
| POTS | Plain old telephone service | Traditional analog voice service delivered over copper telephone lines, powered from the telephone exchange so that phones work during local power outages. |
| PSTN | Public switched telephone network | Worldwide network of traditional telephone lines, exchanges and links that carries landline calls using circuit switching, connecting every phone number in the global… |
| PTT | Push-to-talk | Walkie-talkie style communication in which users hold a button to speak to one person or a group instantly, without dialing. |
| PUK | PIN Unblocking Key | Eight-digit code used to unlock a SIM card after the SIM PIN has been entered incorrectly three times. |
| QAM | Quadrature amplitude modulation | Modulation method that encodes data by varying both the amplitude and phase of a radio signal, packing more bits into each symbol. |
| RAN | Radio access network | Part of a mobile network that connects phones and other devices to the core network over the air, consisting of antennas, radios and base-station equipment at cell sites. |
| RCS | Rich Communication Services | Messaging standard from the mobile industry that upgrades SMS with typing indicators, read receipts, high-resolution photos and videos, group chats and messaging over… |
| RF | Radio frequency | Electromagnetic frequencies used for radio communication, roughly 3 kilohertz to 300 gigahertz. |
| RFID | Radio-frequency identification | Technology that uses radio waves to read data from small tags attached to objects, animals or cards, often without batteries or line of sight. |
| RJ11 | Registered Jack 11 | Small modular connector used for landline telephones, fax machines and DSL connections, with a six-position plug usually wired with two or four contacts. |
| RSSI | Received signal strength indicator | Measurement of how strong a radio signal is at a receiver, usually given in negative dBm values for Wi-Fi and cellular devices; numbers closer to zero mean a stronger… |
| SAR | Specific absorption rate | Measure of how much radio-frequency energy the body absorbs from a device such as a mobile phone, expressed in watts per kilogram. |
| SDR | Software-defined radio | Radio system in which functions traditionally handled by hardware, such as filtering, mixing and demodulation, are performed in software, letting one device receive or… |
| SIM | Subscriber Identity Module | Smart card in a mobile phone that stores the subscriber's identity and secret authentication key, linking the device to a carrier account and phone number. |
| SMS | Short Message Service | Standard text-messaging service on mobile phones, sending messages of up to 160 characters over the cellular network without needing internet access. |
| T1 | Transmission System 1 | Digital telephone and data line carrying 1.544 Mbit/s, divided into 24 channels of 64 kbit/s each, used in North America and Japan for business phone systems and… |
| TDD | Time-division duplex | Method of two-way radio communication in which uplink and downlink share the same frequency, alternating rapidly in time. |
| TDMA | Time-division multiple access | Channel-sharing method that divides a radio frequency into repeating time slots assigned to different users; GSM uses it with eight slots per channel. |
| TTY | Teletypewriter (Unix terminal) | Name Unix-like systems give to terminal devices, the text interfaces through which users type commands. |
| UC | Unified communications | Integration of phone calls, video meetings, instant messaging, presence, voicemail and file sharing into one platform, such as Microsoft Teams, Zoom, Cisco Webex or… |
| UMTS | Universal Mobile Telecommunications System | 3G mobile standard developed by 3GPP as the successor to GSM, used by most 3G networks outside the CDMA world. |
| USSD | Unstructured Supplementary Service Data | GSM protocol for real-time text sessions between a phone and the operator's systems, started by dialing codes such as *123# to check balance, buy data bundles or use… |
| UWB | Ultra-wideband | Short-range radio technology that sends very short pulses across a wide frequency range, allowing devices to measure distance and direction to within centimeters. |
| VDSL | Very-high-bit-rate digital subscriber line | Faster DSL technology for short copper runs, usually from a street cabinet fed by fiber, delivering up to around 100 Mbit/s with VDSL2 on very short lines. |
| VoIP | Voice over Internet Protocol | Technology for making phone calls over the internet or private IP networks instead of traditional phone lines, used by apps such as WhatsApp and Teams, business phone… |
| VoLTE | Voice over LTE | Technology that carries phone calls as data over a 4G LTE network, using the IP Multimedia Subsystem, instead of switching to older 2G or 3G networks. |
| VoNR | Voice over New Radio | Technology that carries phone calls directly over a 5G standalone network, rather than dropping back to 4G VoLTE when a call starts. |
| VoWiFi | Voice over Wi-Fi | Technology, usually labeled "Wi-Fi calling" on phones, that routes ordinary phone calls and texts over a Wi-Fi internet connection to the carrier's network, improving… |
| VSAT | Very small aperture terminal | Two-way satellite ground station with a dish typically under three meters, used to provide internet, phone and data links to remote sites, ships, oil rigs, rural… |
| WAP | Wireless Application Protocol | Late-1990s standard for accessing simplified web pages and services on mobile phones with tiny screens and slow connections, using a markup language called WML. |
| WCDMA | Wideband code-division multiple access | Air-interface technology of UMTS 3G networks, using 5 MHz-wide channels shared by many users through spreading codes. |
| WEA | Wireless Emergency Alerts | US public-alert system that broadcasts urgent messages, such as AMBER alerts, extreme weather warnings and national alerts, to all compatible phones in an affected… |
| Wi-Fi | Wi-Fi (wireless local area networking based on IEEE 802.11) | Wireless networking technology that connects phones, laptops, TVs and smart devices to a local network and the internet through a router or access point, using the 2.4… |
| Wi-Fi 6 | Wi-Fi 6 (IEEE 802.11ax) | Wi-Fi generation certified from 2019 that improves speed and especially efficiency in crowded places with many devices, using OFDMA, 1024-QAM modulation, uplink and… |
| Wi-Fi 6E | Wi-Fi 6 Extended | Extension of Wi-Fi 6 to the 6 GHz band, which adds many wide, uncongested channels for faster, lower-latency connections. |
| Wi-Fi 7 | Wi-Fi 7 (IEEE 802.11be) | Newest mainstream Wi-Fi generation, certified from January 2024, introducing 320 MHz channels in the 6 GHz band, 4096-QAM modulation and multi-link operation, which… |
| WiMAX | Worldwide Interoperability for Microwave Access | Wireless broadband technology based on the IEEE 802.16 standard, marketed in the late 2000s as a 4G competitor to LTE for mobile and fixed internet access. |
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