| 3G, 4G, or 5G |
Term coined for a generation of mobile technology based on LTE
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| 700 MHz | |
| 800 MHz | |
| A to D | |
| ALI |
Automatic Location Information is provided to agents answering E-9-1-1 calls. It may include information such as name, phone number, address, nearest cross street, and special pre-existing conditions. It is a database.
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| AM | |
| Amplification |
The process of increasing the strength of a radio signal.
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| APCO |
Assoication of Public Safety Communications Officials International
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| ARMER |
Allied Radio Matrix for Emergency Response
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| Astro Site Repeater | |
| AVL |
Automatic Vehicle Location
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| Backbone |
Statewide ARMER public safety radio communication system that consists of a shared infrastructure, the elements of which are identified in the State Public Safety Radio Communications Plan
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| Backward Compatibility |
Ability of new units to operate within an "old" system infrastructure or to directly intercommunicate with an "old" unit. [8]
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| Band Pass Filter |
A filter that allows a certain range of frequencies to pass but which will reject frequencies below and above the desired range.
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| Band Plan |
A plan to allocate different frequencies within a range for specific purposes and users.
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| Bandpass |
The frequency range that a receiver is currently tuning or that a filter permits to pass through it.
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| Bandwidth |
The difference between the limiting frequencies of a continuous frequency band. Typically measured in kilohertz. May be considered the amount in kilohertz required for a single communications channel.
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| BDA | |
| Bearer |
In Telecommunications it is an information transmission path
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| BIA | |
| BLM |
Bureau of Land Management
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| CAD | |
| Call Sign |
A group of letters and numbers used to identify a station and the country authorizing its operation.
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| Calling Frequency |
An agreed-upon frequency where stations attempt to contact each other; once contact is made, stations move to a working frequency.
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| CANUS | |
| Carrier |
The unmodulated output of a radio transmitter.
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| Car-to-car |
To communicate with another station without using a repeater. To transmit and receive on the same frequency. Also referred to as direct or simplex.
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| CBP |
Customs and Border Protection
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| CDMA |
Code Division Multiple Access is a channel access method where several transmitters can send information simultaneously over a single channel.
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| CEB | |
| CFR |
Code of Federal Regulations
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| Channel |
The frequency on which a radio transmission takes place, or the input and output frequency pair used by a repeater station.
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| Channel Integrator |
A fairly new and sophisticated, process/device or system which takes several inbound radio signals from a variety of bands and electronically interconnects them on the "outbound side" to one or more other otherwise incompatible radio channels. Examples: J
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| CIWG |
Canada-United States (CANUS) Communications Interoperability Working Group
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| Co-channel Interference |
Interference from stations on frequencies adjacent to the desired signal.
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| COLT |
Communications on Light Truck
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| Console Patch |
Buttons or icons in the dispatcher's radio console that (when properly selected) permit the ability to "patch" or connect two dissimilar regular radio channels or "trunked radio talkgroup" together for a specific conversation. (Example: Patching the VHF F
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| Control Point |
The physical location from which a radio station's functions (setting frequency, turning the station off and on, etc.) are controlled.
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| COW | |
| C-plane |
Control Plane is a part of routing architecture that carries signaling data as opposed to user data.
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| CPS |
Customer programming software
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| CQI |
Channel Quality Indicator is information sent by the UE to the core to describe the data rate suitable for the UE's signal to interference plus noise ratio
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| Cross Band Repeater |
A single device which receives inbound radio traffic on one channel in one band (say MINSEF on VHF @ 155.475 MHz) and rebroadcasts it out on another channel in another band (say NPSPAC InterOp Channel 1 at 866.0125 MHz) and vice-versa
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| CSFB |
Circuit Switched Fall Back
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| CSIS |
Cross Spectrum Interoperability System -- A Minnesota-based interoperability concept (see Standard 3.16.3)
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| CTO | |
| DAS |
Distributed Antenna System
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| Datacasting | Datacasting is the transmission of secure data (including voice, text, files, images, and video) over existing broadcast television signals to a targeted audience. |
| dB | |
| Dead Zone |
A region where a radio signal cannot be received due to propagation difficulties.
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| Decibel |
The ratio between two power levels on a logarithmic scale. A 3 decibel increase is a doubling of power; a 20 decibel increase is a power increase of 100 times.
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| DHS |
US Department of Homeland Security
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| Digital & Analog |
The methods of modulating a radio signal as it travels through the air. Example: Digital signals are the speaker's words turned into a series of 1's and 0's, which are then transmitted through the air, received at the other end and then reconstituted back
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| Direct |
To communicate with another station without using a repeater. To transmit and receive on the same frequency. Also referred to as simplex; or car to car.
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| DIU | |
| DL |
Downlink is the radio link in the direction from the core/base station to the UE.
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| DMR | DMR is an European Telecommunications Standards Institute (ETSI) radio standard using a 2-slot TDMA digital technology in a 12.5 kHz channel width, allowing 2 talk paths with a 6.25 kHz equivalent spectral efficiency when communicating through the repeater. |
| dPMR | dPMR (digital Private Mobile Radio) is a 6.25 kHz FDMA protocol, similar to NXDN. |
| DTMF |
Dual tone multiple frequency
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| Duplex |
To transmit on one frequency while listening for replies on another.
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| EBWG |
Early Builder Working Group
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| Effective Radiated Power |
The output of a transmitter multiplied by the gain of an antenna.
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| eNB |
Evolved NodeB is a piece of hardware in the 4G LTE architecture that communicates directly to the UE.
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| Encryption |
In digital radio systems, all radio transmissions are "digitized" (broken down into a formatted series of 1'os and 0's according to some logic mutually known to all radios on that system) at a minimal, standards based level. In an "encrypted" system, thes
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| EPC |
Evolved Packet Core is a framework for providing converged voice and data on a 4G Long-Term Evolution (LTE) network which is responsible for the overall control with the UE.
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| EPS | |
| E-UMTS |
Evolved Universal Mobile Telephone Service
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| EvDO |
Evolution-Data Optimized is a telecommunications standard for wireless transmission of data through radio signals.
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| FCC |
Federal Communications Commission
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| FDD |
Frequency Division Duplex is a mode of communication where uplink and downlink transmission take place at the same time on different frequencies.
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| FDMA |
Frequency division Multiple Access is an access scheme for allowing users to share the same frequency channel by accessing the channel on different frequencies.
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| Federal Law Enforcement Wireless Users Group (FLEWUG) |
An information exchange mechanism for the federal law enforcement wireless communications user community.
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| Federal Partnership for Interoperable Communications (FPIC) |
FPIC aims to address interoperability among the public safety community at all levels of government, foster intergovernmental cooperation, and identify and leverage common synergies.
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| Feedline |
The cable connecting a radio to an antenna.
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| FEMA |
Federal Emergency Management Agency
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| Fiber Optic |
refers to the medium and the technology associated with the transmission of information as light impulses along a glass or plastic wire or fiber. Fiber optic wire carries much more information than conventional copper wire and is far less subject to elect
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| Filter |
A circuit or device that will allow certain frequencies to pass while rejecting others.
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| FIPS |
Federal Information Processing Standards
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| Fixed Station |
A station that always operates from a constant, specified land location.
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| FLEWUG |
Federal Law Enforcement Wireless Users Group
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| FM | |
| FPIC |
Federal Partnership for Interoperable Communications
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| FTP |
File Transfer Protocol is a protocol for transferring files from one host to another over IP.
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| Gain |
The apparent increase in the strength of a signal radiated or received by an antenna caused by the antenna having better performance in some directions than others.
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| GBR |
Guaranteed Bit Rate is a minimum bit rate allocated to a application.
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| GHz | |
| Gigahertz |
Unit equal to 1000 megahertz or 1,000,000 kilohertz
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| GIS |
Geographical Information Systems
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| GPRS |
General Packet Radio Service is the packet oriented mobile data service for 2G and 3G communications.
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| GPS |
Global Positioning System
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| Ground |
A connection to a point of zero voltage, like the Earth.
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| Ground Wave |
A radio wave propagated along the surface of the Earth.
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| GSM |
Global System for Mobile Communications is an older version of mobile communication. It is often referred to as 2G.
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| Hard Patch |
A system whereby a dedicated radio is installed to take what it hears and always patch it over to another radio system channel or talk group, and (sometimes) vice-versa. (Example: The Street Department's UHF radio channel is "hard patched" to a talk group
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| Hertz |
One complete cycle of a radio wave per second.
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| Heterodyne |
A high pitched "whistle" sound caused by two carriers interfering with each other. The pitch of the "whistle" depends on the frequency difference between the carriers.
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| HF | |
| HLR |
Home Location Register is a central database that contains subscriber information for GSM and/or WCDMA
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| HSPA |
High Speed Packet Access is a combination of two mobile Telephony protocols. It extends and improves 3G networks.
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| HSS |
Home Subscriber Server - go
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