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Definitions

This list contains Acronyms and definitions related to Land Mobile Radio, 911, Broadband. 

 

  
Definition
3G, 4G, or 5G
Term coined for a generation of mobile technology based on LTE
Third Generation Partnership Project
Project for third generation long term evolution technology to be used and adopted.
700 MHz
764-776 and 794-806 MHz
800 MHz
794-815 and 839-860 MHz
A to D
Analog to Digital
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.
AM
Amplitude Modulation
Amplification
The process of increasing the strength of a radio signal.
APCO
Assoication of Public Safety Communications Officials International
ARMER
Allied Radio Matrix for Emergency Response
Allocation and Retention Priority
AVL
Automatic Vehicle Location
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
Backward Compatibility
Ability of new units to operate within an "old" system infrastructure or to directly intercommunicate with an "old" unit. [8]
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.
Band Plan
A plan to allocate different frequencies within a range for specific purposes and users.
Bandpass
The frequency range that a receiver is currently tuning or that a filter permits to pass through it.
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.
BDA
Bi-Directional Amplifier
Bearer
In Telecommunications it is an information transmission path
BIA
Bureau of Indian Affairs
BLM
Bureau of Land Management
CAD
Computer Aided Dispatch
Call Sign
A group of letters and numbers used to identify a station and the country authorizing its operation.
Calling Frequency
An agreed-upon frequency where stations attempt to contact each other; once contact is made, stations move to a working frequency.
CANUS
Canada-United States
Carrier
The unmodulated output of a radio transmitter.
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.
CBP
Customs and Border Protection
CDMA
Code Division Multiple Access is a channel access method where several transmitters can send information simultaneously over a single channel.
CEB
Central Electronics Bank
CFR
Code of Federal Regulations
Channel
The frequency on which a radio transmission takes place, or the input and output frequency pair used by a repeater station.
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
CIWG
Canada-United States (CANUS) Communications Interoperability Working Group
Co-channel Interference
Interference from stations on frequencies adjacent to the desired signal.
COLT
Communications on Light Truck
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
Control Point
The physical location from which a radio station's functions (setting frequency, turning the station off and on, etc.) are controlled.
COW
Communications on Wheels
C-plane
Control Plane is a part of routing architecture that carries signaling data as opposed to user data.
CPS
Customer programming software
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
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
CSFB
Circuit Switched Fall Back
CSIS
Cross Spectrum Interoperability System --  A Minnesota-based interoperability concept (see Standard 3.16.3)
CTO
Chief Technology Officer
DAS
Distributed Antenna System
dB
decibel
Dead Zone
A region where a radio signal cannot be received due to propagation difficulties.
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.
DHS
US Department of Homeland Security
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
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.
DIU
Digital interface unit
DL
Downlink is the radio link in the direction from the core/base station to the UE.
DTMF
Dual tone multiple frequency
Duplex
To transmit on one frequency while listening for replies on another.
EBWG
Early Builder Working Group
Effective Radiated Power
The output of a transmitter multiplied by the gain of an antenna.
eNB
Evolved NodeB is a piece of hardware in the 4G LTE architecture that communicates directly to the UE.
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
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.
EPS
Evolved Packet System
E-UMTS
Evolved Universal Mobile Telephone Service
EvDO
Evolution-Data Optimized is a telecommunications standard for wireless transmission of data through radio signals.
FCC
Federal Communications Commission
FDD
Frequency Division Duplex is a mode of communication where uplink and downlink transmission take place at the same time on different frequencies.
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.
Federal Law Enforcement Wireless Users Group (FLEWUG)
An information exchange mechanism for the federal law enforcement wireless communications user community.
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.
Feedline
The cable connecting a radio to an antenna.
FEMA
Federal Emergency Management Agency
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
Filter
A circuit or device that will allow certain frequencies to pass while rejecting others.
FIPS
Federal Information Processing Standards
Fixed Station
A station that always operates from a constant, specified land location.
FLEWUG
Federal Law Enforcement Wireless Users Group
FM
Frequency Modulation
FPIC
Federal Partnership for Interoperable Communications
FTP
File Transfer Protocol is a protocol for transferring files from one host to another over IP.
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.
GBR
Guaranteed Bit Rate is a minimum bit rate allocated to a application.
GHz
Gigahertz
Gigahertz
Unit equal to 1000 megahertz or 1,000,000 kilohertz
GIS
Geographical Information Systems
GPRS
General Packet Radio Service is the packet oriented mobile data service for 2G and 3G communications.
GPS
Global Positioning System
Ground
A connection to a point of zero voltage, like the Earth.
Ground Wave
A radio wave propagated along the surface of the Earth.
GSM
Global System for Mobile Communications is an older version of mobile communication.  It is often referred to as 2G.
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
Hertz
One complete cycle of a radio wave per second.
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.
HF
High Frequency
HLR
Home Location Register is a central database that contains subscriber information for GSM and/or WCDMA
HSPA
High Speed Packet Access is a combination of two mobile Telephony protocols.  It extends and improves 3G networks.
HSS
Home Subscriber Server - go
ICI
Inter Carrier Interface - a form of interference caused by a large delay spread between adjacent carriers.
ICIC
Inter-Cell Interference Coordination Coordinating frequency use to minimize interference between cells.
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