Dispatcher's Glossary

This glossary was originally compiled by John Slomnicki for an Intermediate Dispatcher course at the Washington State. It is posted here on the DISPATCH Monthly Magazine Web site with Slomnick's genorous permission.  

Each word is followed by an abbreviation identifying what field is most likely to use this term.

If you would like to make recommendations for additions, corrections or questions about making copies of this glossary please contact the author at:


We also have the following information posted on the DISPATCH Monthly Web site:




ABRASION EMS: An injury caused by scraping or rubbing of skin against a rough surface.

A-triple F FIRE: SEE A.F.F.F.

A.F.F.F. FIRE: A-triple F, aqueous film forming foam. Designed primarily for use on hydrocarbon Class B fires.

ACCESS-A Central Computerized Enforcement Service System LE: A computer switching network operated by the Washington State Patrol. It acts as a telephone exchange switching and connecting teletype terminals to others and to different data bases.

ADJACENT CHANNEL TECH: Frequencies above and below your operating frequency.

AERIAL FIRE: A mechanically operated turntable ladder attached to a ladder truck and manufactured in length as 65, 75, 85 & 100 ft or greater.


AIR TO AIR NETS ICS: To provide communication between aircraft for coordinating landings, takeoffs and air traffic.

ALI DISP: Automatic Location identification. In E-911 systems the callers billing address is displayed on a screen or console. If phone number is also included it is called ANI-ALI.

ALS EMS: Advanced Life Support, usually refers to paramedic level of emergency first aid including airway management, IV therapy, defibrilation and medication administration.

ALTERNATING CURRENT TECH: A.C. Electrical current that flows first in one direction in a wire and then in the other.

AM - AMPLITUDE MODULATION TECH: The transmission of information on a communications system by varying the voltage level (amplitude).

AMATEUR RADIO DISP: Individuals that are licensed by their respective governments world wide that own their own communications equipment and also provide a voluntary non-commercial communications service.

AMP TECH:Ampere, a unit of measurement for measuring the volume of electrical flow

ANAPHYLACTIC SHOCK EMS: A suddenly developing condition caused by hypersensitivity of the body to foreign materials drugs, bites or stings.

ANEURYSM EMS: A blood filled dilation of a blood vessel resulting from disease, injury or defect of the blood vessel wall.

ANGINA PECTORIS EMS: Chest pain characterized by a sense of severe constriction in the chest.

ANI DISP: Automatic Number Identification. In E-911 systems the callers telephone number is displayed on a screen or console. If address is also included it is called ANI-ALI.

ANI TECH: Automatic Number Identification. A coded signal transmitted by some radios to identify which specific radio is transmitting.

ANOXIA EMS: Absence or lack of oxygen.

ANTENNA TECH: A system of wires or electrical conductors employed for the reception or transmission of radio waves. Specifically, a radiator which couples the transmission line or lead-in to space, for transmission or reception of electromagnetic radio waves. Conductors may be exposed or encased in an electromagnetic transparent case such as plastic or fiberglass. Antennas are measured in dB (decibels) of gain. They may be polarized vertical, horizontal or circular.`

AOB EMS: Alochol On Breath

AOB LE: Amount Of Bail

AORTA EMS: The main artery carrying blood away from the heart..

APCO Association of Public-Safety Communications Officials-International; international organization of managers, operators, technicians and vendors for public-safety communications, New Smyrna Beach, Fl

APNEA EMS: Absence of respiration.

ARRHYTHMIA EMS: An abnormal rhythm of the heartbeat.

ARRL (American Radio Relay League) DISP: An group of licensed amateur radio operators that will relay communications across the street or around the world.

ARTESIAN TECH: A gremlin that lives in the basement of the Tumwater, WA liquor store and attacks the ACCESS/WACIC computer system and causes it to crash when you need it most. Nicknames:Glitch, power surge

ARTICULATED BOOM FIRE: A folding-arm type of hoist used to raise and lower the platform on certain elevating platform apparatus. Sometimes called a snorkel or cherry picker

ASCII TECH:American National Standard Code for Information Interchange, a digital code used in computer, teletype and packet radio-teleprinter

ASPHYXIA EMS: Suffocation.

ASPIRATE EMS: To draw in or out by suction; to breathe liquid or foreign material into the lungs.

ASSOCIATION OF AMERICAN RAILROADS HAZMAT: 24 hour emergency notification center for train accidents and derailments 1-800-826-4662

ATF (Alcohol Tobacco & Firearms) DISP: A division of the U.S Dept of the Treasury, its prime duties is the investigation of illegal use and possession federally controlled firearms such as machine guns and explosives

ASTHMA EMS: A respiratory condition caused by bronchiolar spasm preventing gas exchange.

ATTACK LINE FIRE: A hose taken by fire fighters for primary fire suppression.

ATTENUATION TECH: A reduction of energy or signal level. See also:DEGRADATION

AUDIO TECH: A range of frequencies that corresponds to the limits of human hearing abilities .

AVULSION EMS: A forcible separation or tearing away of a body part or tissue.

BACK DRAFT FIRE: An explosion caused by rapid burning of heated gases and the introduction of oxygen where air is admitted to a building heavily charged by smoke from a fire which has depleted the oxygen.

BASE STATION TECH: An item of fixed radio hardware consisting of a transmitter and a receiver. A land station in the land mobile radio service carrying on a service with land mobile stations.

BAUD TECH: A unit of signalling speed used similarly to bits per second (bps). It is equal to the number of signal events per second regardless of the information the signals contain.

BIA (Bureau of Indian Affairs - U.S. Dept of the Interior)

BIT RATE TECH: The rate at which data bits are transmitted over a communications path. This is expressed in bits per second (bps) not to be confused with data signaling rate (baud)

BLEVE - Boiling Liquid Expanding gas Vapor Explosion FIRE: Violent explosion caused by the heating of a liquified gas such as propane, butane or natural gas to its flash point in a confined place such as a tank, truck or rail car.

BLITZ LINE FIRE: Two and a half inch standard size fire hose attack line that is pre-connected.

BLS EMS: Basic Life Support, usually refers to first aid providers with first responder or EMT certification. Some EMT's may be defibrilation technicians also.

B.O.O.T. PRINCIPLE DISP: Be Out Of Town. Prearranged and approved vacation during the time of a disaster.

BRADYCARDIA EMS: a slow heart rate, below 60/min.


CAD DISP: Computer Aided Dispatch. A computer database that tracks calls for service, maintains status on units available, provides various reports, address history, electronic mail....

CALL CHECK DISP: An instant playback recorder used by dispatchers to verify information given them during a call for assistance. There are two types, tape and digital memory.

CAMEO - Computer-Aided Management of Emergency Operations HAZMAT: A computer system designed by NOAA which provides respondents to chemical emergencies a resource of information about hazardous chemicals. Available from ACCESS via admin message.

CAMEO AIR MODEL HAZMAT: A plume modeling program which computes the airborne plume for a variety of chemicals under differing atmospheric conditions and can graphically represent this plume on digitized maps.

CAMEO CODEBREAKER HAZMAT: A chemical identification database containing thousands of synonyms, UN numbers and labeling conventions, each cross-referenced with standard names and UN numbers. SEE: ACCESS Memo# 315

CAMEO DATABASE HAZMAT: A database of response sheets for 2600+ hazardous chemicals. These response sheets are similar to, but more detailed than the NLETS hazardous materials file.

CAP (Civil Air Patrol) DISP: Also known as the U.S. Air Force Auxiliary, it is made up of volunteers, some with their own aircraft that assist in locating downed aircraft and in the rescue of the occupants.

CARDIAC EMS: Pertaining to the heart.

CARRIER TECH: Radio wave radiated by a transmitter without modulation.

CAVITY TECH: A device used in antenna systems. It helps to reduce receiver degradation, and increase selectivity.

CCU EMS: Coronary Care Unit. A section of a hospital that specializes in the care of patients with heart problems.

CELLULAR TELEPHONE TECH: An 800 Mhz based system allows mobile to communicate with the PSTN. The are two systems in each area, wire line (Ma Bell) and non-wire line (private ownership) for competition reasons.

CEREBRAL EMS: Pertaining to the brain.

CERVICAL SPINE EMS: The first seven bones of the spine, found in the neck.

CHANNEL TECH: Sometimes used synonymously with "frequency." It is a generic term without regard for specific frequency or band width.

CHANNEL GUARD TECH: Trade name of the General Electric Company. SEE: CTCSS

CHEMTREC HAZMAT: Chemical Transportation Emergency Center, operated by the Chemical Manufacturers Associations since 1971. Provides 24 hour database and emergency referrals 1-800-424-9300.

CHF EMS: Congestive Heart Failure. CHF occurs when failure in a heart muscle causes fluid accumulation in the tissues. When the left side of the heart fails, fluid accumulates in the lungs (pulmonary edema). If right heart failure exists, fluid accumulates in the abdominal organs and lower limbs.

CITIZEN BAND (CB) TECH: From 26.96 Mhz to 27.43 Mhz. (40 channels). A radio frequency band for unlicensed low power transceivers (4 watts max). Channel 9 is US/Canadian emergency frequency.

CLASS A FIRE FIRE: Fires fueled by wood, paper, rubber and plastic CLASS B FIRE FIRE: Fires fueled by flammable liquids, greases and gases CLASS C FIRE FIRE: Fires involving energized electrical equipment. CLASS D FIRE FIRE: Fires involving combustible metals such as magnesium, titanium, zirconium, sodium and potassium.

CLAVICLE EMS: The collarbone.

CLEAN POWER TECH: A power source that is free of surges and other interference that could cause harm to sensitive microprocessor based equipment such as computers, radios, and consoles.

CLIF FILES - Computerized License Information File LE:A database available through ACCESS that allows police agencies to track contacts with out of state vehicles for the purpose of determining residency and failure to acquire a state license.

CO-CHANNEL TECH: Other transmitters operating on the same frequency

CO-CHANNEL INTERFERENCE TECH: Interference caused by other transmitters operating on the same frequency. This is very common on low and high VHF. The interfering agency may be in a different city, county, state or country

COAXIAL CABLE TECH: a feed line with a central conductor surrounded by plastic or foam insulation, which is covered by a soft shielding conductor and the entire cable is covered with vinyl insulation.

COMA EMS: A state of unconsciousness from which the patient cannot be aroused.


COMMAND NET ICS: The communications network between the Incident Commander, key staff, Section Chiefs, Division and Group Supervisors. The OSCCR frequency 156.135 Mhz is used here.

COMMAND POST ICS: A location where the officer-in-charge or incident commander can meet with other resource personnel or commanders from different agencies.

COMPARATOR TECH: Used with two or more satellite receivers, it chooses the best signal and routes the audio back to the repeater or console. Also called a Voter.

CONTINUOUS DUTY TECH: A rating applied to receivers and transmitters to indicated their capability for us in a continuous duty cycle ( as opposed to the term "intermittent duty").

CONTROLLED BURN FIRE: Usually refers to land clearing operations where slash wood is burned. A burning permit or a permit from the local air pollution control board in normally required.

CONTUSION EMS: An injury in which the skin is not broken, a bruise.

CONVULSION EMS: Involuntary muscular contraction and relaxation.

COPD EMS: Chronic Obstructive Pulmonary Disease. This refers to conditions such as asthma, emphysema, etc. Those diseases that reduce the ability of the lungs to exchange gasses.

COVERAGE TECH: In a radio communications system, the geographic area where reliable communications exist; usually expressed in terms of miles extending radially from a fixed radio station.

CPR EMS: Cardio-Pulmonary Resuscitation. The technique of using a combination of external chest compressions and artificial respiration to support a patient without respiration or pulses.

CPS (Child Protective Services) DISP: A division of DSHS, that investigates abuse to minor children. Places children in foster homes when no parent or guardian is available.

CRIBBING FIRE: Short pieces of lumber used to support and stabilize an object

CTCSS TECH: Continuous Tone Controlled Squelch System. A sub-audible tone transmitted by a radio that opens the squelch on other radios in the same system. Also known as PL or Channel Guard.

CVA EMS: Cerebro Vascular Accident. Also known as a stroke. It is caused by either a blockage or rupture of a blood vessel in the brain. In either case, blood and oxygen does not get to all areas of the brain, causing death of that section of the brain.

CYANOSIS EMS: A bluish or purplish discoloration of the skin due to lack of oxygen in the blood.

D5W EMS: An intravenous (IV) solution of 5% glucose (sugar) in water.


DATABASE TECH: Any information that is stored for later retrieval by a computer.

DEA (Drug Enforcement Administration - U.S.) LE: A division of the FBI under the U.S. Dept of Justice.

DECIBEL (dB) TECH: A unit which expresses the level of a power value relative to a reference power value. For every 3dB there is a 2x factor. IE: An antenna with a 3dB gain and a 10 watt transmitter, will double the power the power at the horizon with an effective radiated power of 20 watts. A 6dB antenna would provide 40 watts and so on.

DEDICATED LINE TECH: A phone line, private or leased that is dedicated (not dial up) to providing a continuous communications path between two points for voice or data. May be hard wire, fiber optics or microwave.

DEGRADATION TECH: The effect on receiver sensitivity caused by your own (on repeater systems) or other adjacent channel transmitters. Reduction in the ability to hear weak signals. SEE ALSO: ATTENUATION

DEM (Department of Emergency Management) DISP: The department in a city, town or county that coordinates disaster planning and resources.

DEM (Division of Emergency Management) DISP: Under the Washington State Department of Community Development, it is responsible for the coordination of emergency training, resources and communications throughout the state.

DEMODULATION TECH: The process of recovering the voice or data from a modulated electromagnetic wave.

DES (Department of Emergency Services) DISP: The department in a city, town or county that coordinates disaster planning and resources.

DEVIATION TECH: The amount of bandwidth required to pass a certain amount of information from the center of a radio frequency. IE: In the land mobile frequencies a maximum of 5Khz deviation is allowed above and below the authorized frequency for a total of 10 Khz bandwidth. In the television band 3 Mhz deviation or 6 Mhz bandwidth is allowed for the combined transmission of picture and sound.

DIABETES EMS: A disease characterized by the inadequate secretion or utilization of insulin in the body resulting in excessive amounts of sugar in the blood.

DIAPHRAGM EMS: A muscular wall separating the thoracic (chest) abdominal cavities.

DIASTOLIC EMS: The point of least pressure in the arterial vascular system. One of two points measured in blood pressure. SEE ALSO: SYSTOLIC

DIGITAL ENCRYPTION TECH: A method of voice or data scrambling that converts audio to unintelligible noise. This is the most secure way of preventing unintended eavesdropping. There are millions of possible codes.

DIGITAL PRIVATE LINE (DPL) TECH: Serves the same purpose as CTCSS but substitutes digital data for the sub-audible tone. They are not compatible with each other, but some radios offer both types in one radio.

DIRECT TECH: A term normally used in relation to VHF and UHF operation, simplex operation means you are receiving and transmitting on the same frequency. ALSO CALLED SIMPLEX

DIRECT CURRENT TECH: D.C. Electrical current that flows in one directions. Power supplied by a battery.

DIRECTIONAL ANTENNA TECH: An antenna possessing the ability to strongly radiate signals in a specific direction. SEE ALSO: YAGI

DISTAL EMS: Farthest from the center or median.

DNR (Department of Natural Resources) DISP: The agency in the State of Washington responsible for the thousands of square miles of range land in the state. DNR also operates fire crews to fight fires on DNR administered lands.

DNR - DO NOT RESUSCITATE EMS: Usually a patient with a terminal illness that has made prior arrangements with their doctor and local EMS provider not to provide advanced life support in time of death.

DOA - Dead On Arrival

DOC (Department Of Corrections) DISP: Operates prisons in the State of Washington also Probation and Parole supervision through Community Corrections Division.

DOC COMPUTER - Department Of Corrections Computer LE: A database available, it provides current status on state inmates in prison, on probation and parole. Provides address and phone number of supervising facility or office.

DOE (Department Of Energy - Federal) DISP: The agency of the U.S. Government that oversees the operation of nuclear reactor facilities and the security of radioactive materials and weapons grade materials such as plutonium.

DOT (Department of Transportation - National) DISP: An agency in Washington D.C. that provides funds for the inter-state highway systems. Set standards for the transportation of hazardous materials and their containers. Also USCG and FAA

DOT (Department of Transportation - State) DISP: Maintains the interstate highways and marine highways; varies by state.

DOT BOOK - Hazardous Materials Reference Manual HAZMAT: An orange paperback book published by the US Dept of Transportation that lists and cross references different materials, their hazards, clean-up precautions and DOT placard number.

DOWN LINK TECH: The signal transmitted by a repeater to mobiles or a control station, in UHF frequencies it is usually the lower frequency of a frequency pair.


DRAFTING FIRE: Using hard, non-collapsible hose to draw water from a lake, river or below ground tank, also called hard suction.

DRY SYSTEM FIRE: A dry pipe automatic sprinkler system having air under pressure in sprinkler piping in areas subject to freezing. Air is released when a sprinkler head opens and allows water to flow.

DRY SYSTEM GONE WET FIRE: A dry pipe automatic sprinkler system after going into alarm and is now flooded with water. May be caused by activated sprinkler, or rapid change in water pressure.

DSHS (Department of Social and Health Services) DISP: A department of the State of Washington responsible for numerous state services including emergency medical, child protective services, welfare, radiation control and public health.

DTs EMS: Delirium Tremens. A disorder involving visual and auditory hallucinations from habitual and excessive use of alcohol. Usually experienced during detoxification.

DTMF TECH: Dual Tone Multiple Frequency, also known as Touch Tone, it is a common method of signaling used in telephone and radio systems. As the name implies, two tones are transmitted together.

DUCE AND A HALF FIRE: Two and a half in standard size fire hose attack line

DUODENUM EMS: The first part of the small intestines.

DUPLEX TECH: Used to describe continuous communications in two directions, two separate frequencies are required. Telephone is an example of duplex communications. No push to talk is required.

DUPLEXER TECH: A device used in repeater antenna systems, allows repeater to transmit and receive at the same time using one antenna and feed line. It also helps to reduce receiver degradation.

DUPLEX OPERATION TECH: The operation of transmitting and receiving at the same time without having to "press to talk" usually associated with telephone operation.

DUSTOFF EMS: The military call sign of MAST helicopter units.

DVPA LE: Domestic Violence Protection Act. A group of laws enacted to allow law enforcement to intervene in family disputes that have or could result in an assault. The law also orders law enforcement to make an arrest if an assault has taken place and also provides for no contact and protection orders once a subject is released from jail.

DYSPNEA EMS: Air hunger resulting in labored or difficult breathing.

E-911 DISP: ENHANCED 9-1-1 provides the PSAP with the callers telephone number and billing address.

ECG (Electrocardiogram) or EKG (Electrokardiogram) German spelling. EMS: A visual representation of heart electrical activity. Used both in the field and in hospital by EMS and medical specialists.

ECLAMPSIA EMS: A toxic state that can develop in the third trimester of pregnancy. It is characterized by increased blood pressure, fluid retention and possibly seizures.

ECTOPIC PREGNANCY EMS: The development of a fetus outside the uterus, ie: the fallopian tubes.

EDEMA EMS: An excessive amount of fluid in the tissues. SEE ALSO CHF.

ELECTROMAGNETIC NOISE TECH: Unwanted EM waves getting into a receiver. May come from outer space (sun & stars), thunderstorms, motors, fluorescent lights, computers, ignition systems other communications systems.

ELECTRONIC MAIL (E-MAIL) TECH: Available on some CAD systems, E-Mail allows one person to leave messages for another using the same computer network. Passwords are used to keep messages private.

EMBOLISM EMS: An obstruction of a blood vessel by a foreign substance or a blood clot.

EMETIC EMS: An agent which produces vomiting. SEE ALSO: IPECAC

EMPHYSEMA EMS: A chronic pulmonary disease resulting in respiratory distress. SEE ALSO: COPD

EMS (Emergency Medical Services)

EOC (Emergency Operations Center) DISP: Any facility that is used for the coordination of emergency operations.

EOD - EXPLOSIVES ORDNANCE DETACHMENT MILITARY: A military unit that is trained in the disposal and safe detonation of explosives.

EPA (Environmental Protection Agency) DISP: An agency of the U.S. government that funds and oversees clean-up operations of hazardous materials.

EPILEPSY EMS: Recurring transient attacks of disturbed brain function, frequently altered state of consciousness or seizures.

EPIGLOTTIS EMS: A lid like cartilaginous structure at the entrance to the larynx to prevent food from entering the larynx and trachea while swallowing. EPIGLOTITIS an infection of the epiglottis. Can cause severe swelling in the throat that can compromise respiration.

EPISTAXIS EMS: Nose bleed.

EPROM - ERASABLE PROGRAMMABLE READ-ONLY MEMORY TECH: An integrated chip device that can be erased when exposed to ultraviolet light. It is then reprogrammable using memory programming equipment.

ETOH EMS: Alcohol Intoxification

EVOLUTION FIRE: A standard method of operating. Details the proper action and teamwork necessary to accomplish task. Hose Evolutions: different hose lays.

EXPOSURES FIRE: Property or structures in the vicinity of a fire that are in jeopardy of being damaged due to fire, heat or smoke.

EXTENSION (OF FIRE) FIRE: Spread of fire, usually during the course of fire fighting operations, as extension of fire through open partitions into the attic, walls or crawl space.

EXTRADITION LE: The legal process through which a defendant may challenge the request of another state or nation to deliver the defendant to their custody.

FAA (Federal Aviation Administration) DISP: The guys we don't want to call and tell them one of their aircraft crashed.

FBI (Federal Bureau of Investigation) DISP: A division of the U.S. Dept of Justice responsible for investigating federal crimes also operates NCIC and maintains criminal histories.


FEBRILE EMS: Pertaining to fever. Febrile convulsions are seizures due to high fever in small children.

FEDERAL COMMUNICATIONS COMMISSION TECH: A branch of the U.S. government charged with regulation of radio communications

FEED BACK TECH: High pitched sound generated by an audio loop. IE: A portable left on in a car while the mobile is transmitting on the same frequency.

FEED LINE TECH: The cable that connects the radio to the antenna. See COAX, HELIAX, WAVE GUIDE

FELONY LE: Any crime which is punishable by incarceration in a state or federal prison.

FEMA (FEDERAL EMERGENCY MANAGEMENT AGENCY) DISP: A federal agency that coordinates communications, resources and training nationwide for disasters. Also operates the National Fire Academy.

FEMUR EMS: The thigh bone.

FIBER OPTICS TECH: A technology employing plastic or glass fibers that carry light which may be modulated by information using LEDs or lasers.

FIBRILLATION EMS: Quivering or spontaneous contraction of individual muscle fibers. Usually refers to the heart. When the heart is in a state of fibrillation, the heart quivers and does not pump blood/

FIBULA EMS: The outer and smaller of the two bones extending from the knee to the ankle.

FILTER TECH: Electronic circuitry that blocks some signal components (such) a noise while allowing other components to pass through uniformly.

FIRMWARE TECH: A set of software instructions placed in a read-only memory (ROM).

FLAIL CHEST EMS: A condition of the chest caused by severe injury resulting in several ribs being fractured in more than one place leaving a segment of the chest wall to move at opposition to normal breathing motion.

FM - FREQUENCY MODULATION TECH: A method of transmitting information on an analog line by varying the carrier frequency.

FPS (Federal Protective Service) DISP: A police agency of the U.S. General Services Administration, they enforce Federal statues on all non-military U.S. reservations and buildings.

FRACTURE EMS: A broken bone.

FREQUENCY TECH: The number of complete cycles per unit of time. When the unit of time is one second, the measurement unit is Hertz Hz (cycles per second)

Frequency Coordinator TECH: An individual or organization that keeps records and makes recommendations for radio frequency assignment, ie. APCO, ASHTO, SIRSA, IMSA, NABER.

FREQUENCY DIVISION MULTIPLEX (FDM) TECH: A term usually associated with microwave communications. FDM basically takes a channel and subdivides it into two or more sub-channels. Some systems have 100+ different sub-channels active.

FUGITIVE LE: A person who is wanted for a felony in another state.

FUGITIVE FROM JUSTICE WARRANT LE: A warrant that is issued by a court for a person failing to appear for an extradition hearing in response to a warrant in another state.

GAIN TECH: A term used to reference amplification or loss in an electronic circuit. Gain is usually measured in decibels (dB).

GENERATOR TECH: A method of generating electricity when no commercial power is available. IE: blackouts, remote sites. Common fuels: gas, diesel, propane, LPG. Capacity is measured is kilowatts per hour

GI EMS: Gastro Intestinal, having to do with the entire digestive tract. GI Bleed (perforated ulcer).

GIGAHERTZ - Ghz TECH: A unit of frequency measurement in 1,000,000,000 cycles per second.

GLITCH TECH: An unexplained malfunction. SEE: ARTESIAN

GOA (Gone On Arrival)

GRAND MAL EMS: Literally "large bad" or "large ill" refers to seizures, denoting gereralized convulsive seizure.

GROUND TO AIR NET ICS: A radio network for tactical communications between ground units and airborne suppression and rescue units. Tactical Nets may also be used for this purpose.

HALF-DUPLEX TECH: A term normally used in relation to VHF and UHF operation, half-duplex operation means you are receiving and transmitting on different frequencies. Only one party may transmit at a time.

HALON FIRE: A colorless, odorless gas. It is used to extinguish fires in materials and equipment which might be damaged or destroyed by other fire fighting agents. It works by absorbing the oxygen.


HARMONICS TECH: Multiple of a frequency. If 100 Mhz is the fundamental frequency then 200 Mhz is the 2nd harmonic, 300 Mhz is the third, 400 Mhz is the fourth, this continues to the Nth degree

Hazardous Materials Reference Manual HAZMAT: An orange paperback book published by the US Dept of Transportation that lists and cross references different materials, their hazards, clean-up precautions and DOT placard number.

HAZMAT FIRE: Hazardous Materials, those materials, liquids or gases that can be dangerous to life or property on contact, by inhalation, contamination or explosion.

HAZMAT FILE - NLETS HAZMAT: Available through NLETS & the National Sheriffs Assn. A computer data base to run UNN's for identification, precautions and hazards. SEE ACCESS MANUAL-NLETS SECTION 6.18

HBD (Has Been Drinking)

HEAR EMS: Hospital Emergency Administrative Radio. 155.340 Mhz. A statewide common frequency for ambulance to hospital and hospital to hospital communications.

HELIAX CABLE TECH: a feed line with a central conductor surrounded by plastic, foam or gaseous insulation, which is covered by a hard shielding conductor and the entire cable is covered with vinyl insulation.

HEMATOMA EMS: A swelling or mass of blood confined to an organ, tissue or space, resulting from a break in a blood vessel.

HEMORRHAGE EMS: Abnormal internal or external discharge of blood.

HERTZ - Hz TECH: A unit of frequency measurement in cycles per second

HF (HIGH FREQUENCY) TECH: 3 - 30 Mhz. This frequency band is used for international shortwave, CB, Operation Secure.

HIGH BAND TECH: Frequency range of 150 - 174 Mhz also called VHF band

HIGH UHF BAND TECH: Frequency range of 460 - 461 Mhz and 465 - 466 Mhz. The first group of frequencies are for base station, repeater and mobile direct transmission. The second set are mobile to repeater.

HUMERUS EMS: Upper bone of the arm from the elbow to the shoulder.

HYPERTENSION EMS: High blood pressure.

HYPERTHERMIA EMS: A result of prolonged heat exposure.

HYPOGLYCEMIA EMS: Deficiency of sugar in the blood.

HYPOTENSION EMS: Low blood pressure.

HYPOTHERMIA EMS: Having a body temperature below normal.

HYPOXIA EMS: Low oxygen content in the blood.

I C ICS: Incident Commander, the highest ranking officer in charge of a fire incident.

ICS (INCIDENT COMMAND SYSTEM) ICS: A pre-planned system of assigning duties of command and responsibility. IE: Combat/Suppression, Communications, Medical/Triage, Finance, Transportation, Public Information...

IECIC (Inland Empire Cooperative Interference Committee) TECH: A group of communications technicians from Eastern Washington with the same goals as the WWCIC. SEE: WWCIC


INCH AND A HALF FIRE: Standard size fire hose attack line

INCIDENT COMMAND SYSTEM (ICS) ICS: A pre-planned system of assigning duties of command and responsibility. IE: Combat/Suppression, Communications, Medical/Triage, Finance, Transportation, Public Information...

INSULIN EMS: A hormone secreted by the pancreas which aids the body in the metabolism of sugar. (Deficiency of insulin results in diabetes; overdose of insulin results in insulin shock.

IPECAC EMS: A dried root of a shrub found in South America, used to induce vomiting.

INTERMOD TECH: INTERMODULATION. The mixing of different frequencies with their products and harmonics causing interference. Mixing may occur in antennas, transmitters, receivers, cyclones fences, pop cans or any piece of ungrounded metal that is in close proximity to high RF radiation .

INVERTER TECH: A device that transforms D.C. "battery" power into A.C. power so it can be used by A.C. equipment when no power is available from the local utility or "clean" power is needed.

IONOSPHERE TECH: A region in the atmosphere about 100 to 250 miles above the earth. The ionosphere is made up of charged particles, or ions.

ISDN (Integrated Services Digital Network) TECH: A new super high quality telephone network designed for high speed computer and video communications using digital signaling.

KILOHERTZ - Khz TECH: A unit of frequency measurement in 1,000 cycles per second.

KNOX BOX FIRE: A locked box that is located on a property usually at a main door or gate containing keys to the property. The fire department has the master key.

LACERATION EMS: A wound or irregular tear in the skin.

LAND MOBILE TECH: Refers to several bands of frequencies: 30-50, 150-174, 450-470.

LARYNX EMS: The enlarged upper end of the trachea below the root of the tongue.

LCD (LIQUID CRYSTAL DISPLAY) TECH: The type of display used on most modern digital watches

LEASED LINE TECH: A communication line for voice and/or data rented from a communications carrier.

LED (LIGHT EMITTING DIODE) TECH: A low voltage device that gives off light as electrons pass through it. They are manufactured in many colors and are used extensively in electronics as clock displays and status markers.

LERN LE: Law Enforcement Radio Network. 155.370 Mhz. A statewide common radio frequency available for inter-agency communications. For mobile use only. Monitored by WSP and administered by WASPC.

LIFEGUARD EMS: The international codeword for aircraft on rescue and medical evacuation missions. A FAA air traffic controller being advised of a lifeguard mission will divert all other traffic away.

LOC EMS: Level of consciousness.

LOGGING RECORDER DISP: A large reel to reel tape recorder that will have multiple recording channels. Used for recording time, date, telephone and radio traffic. Most tapes last 24 hours each.

LOW BAND TECH: Frequency range of 30 - 54 Mhz also called low VHF

LOW UHF BAND TECH: Frequency range of 453 - 454 Mhz and 458 - 459 Mhz. The first group of frequencies are for base station, repeater and mobile direct transmission. The second set are mobile to repeater.


LPG FIRE: liquefied petroleum gas

MARS LE: Mutual Aid Radio System, King County, WA. A series of cross-banded repeaters, satellite receivers and comparators that allow VHF, Low UHF and High UHF radios to communicate.

MANDIBLE EMS: The lower jawbone.

MAST (Military Aid to Safety and Traffic) DISP: A function of the U.S. Army Aviation Unit across the country. They provide helicopter evacuation of injured or sick persons in need of long distance transportation to a medical facility.

MAST PANTS-Military Anti-Shock Trousers EMS: Developed by the military, they are a pneumatic pant that provides pressure in the lower extremities to force blood into the main body cavities. Used on patients with low blood pressure.

MCI EMS: Multiple Casualty Incident or Mass Casualty Incident.

MEDCOM EMS: 10 Channel pairs from 462.950 to 463.175 467.950 to 468.175 Channels 1 - 8 are for EMS provider to hospital/doctor communications. Channels 9 & 10 are for EMS dispatch.

MEGAHERTZ - Mhz TECH: A unit of frequency measurement in 1,000,000 cycles per second.

MENINGITIS EMS: An inflammation of the membranes of the spinal cord or brain.

MICROWAVE TECH: Radio frequencies from 1 - 300 Ghz. It is used for point to point communications.

MICROWAVE (oven) DISP: The oven in the comm center pantry. It uses concentrated radio energy to create friction within food products thus raising its temperature. Also a good source of RFI.

MISDEMEAOR LE: Any crime which is punishable by incarceration in a city or county jail that does not amount to a felony. Incarceration may not exceed one year per count.

MOBILE DATA TERMINAL TECH: A computer terminal mounted in a vehicle that is linked via radio to a stationary computer usually associated with a CAD system. Allows inquiry to databases and to exchange electronic mail.

MODEM TECH: A device that allows computers to communicate over telephone circuits.

MONITOR DISP: Listening to a channel before transmitting to prevent co-channel interference. If receiver is CTCSS equipped, the CTCSS should be disabled to hear others on the channel.

MONITOR TECH: Also known as PL disable it may be a button, switch, paddle or foot switch, it allows the operator to monitor the received frequency without CTCSS thus hearing any traffic on the channel.


MULTIPLEX TECH: A term usually associated with microwave (frequency division multiplex) and computer (time division multiplex) communications. SEE: FREQUENCY DIVISION MULTIPLEX. SEE: TIME DIVISION MULTIPLEX.

MUSHROOMING FIRE: Extension of fire on upper floors due to pent-up heat which reaches to upper parts of the building through unprotected openings and which spreads the fire laterally unless it is ventilated.

MUX (MULTIPLEX CHANNEL) TECH: Usually applies to microwave communications. Each system is composed of a baseband and is broken up into individual MUX channels

MYOCARDIAL INFARCTION (MI) EMS: The damaging or death on an area of the heart muscle from a reduction in the blood supply to that location.

NAVY (Never Again Volunteer Yourself) DISP: How to avoid hearing that train whistle..IE: being railroaded into taking an assignment.

NCIC LE: National Crime Information Center, maintains database of wanted and missing persons, stolen vehicles, articles, criminal histories; operated by the FBI, Washington D.C.

NCIC III - NCIC Interstate Identification Index LE: A nationwide database of criminal histories.

NCO LE: (NO CONTACT ORDER) An order issued by a court in either civil or criminal proceedings prohibits the respondent from having or making contact with the petitioner. SEE ALSO: DVPA.

NLEC LE: National Law Enforcement Communications System. 155.475 Mhz. A nationwide common emergency radio channel for law enforcement. Monitored by most state police agencies.

NLETS LE:National Law Enforcement Telecommunications System, Inc. provides interstate teletype and computer network switch, located in Phoenix, Arizona

NOAA (National Oceanic and Atmospheric Administration) DISP: A division of the U.S Dept of Commerce, NOAA studies oceanographic resources also responds to hazardous material spills in salt water areas (206) 526-6317

NON-VOLATILE MEMORY TECH: Memory storage that is not lost when equipment is powered down.

NTSB (National Transportation Safety Board) DISP: The guys from Washington D.C. that investigate aircraft and rail accidents.

OCCLUSION EMS: The closure of a passage.

OD EMS: Overdose.

OES (Office of Emergency Services) DISP: The office or department in a city, town or county that coordinates disaster planning and resources.

OFFSET TECH: The difference between a repeater's input and output frequencies. On UHF the offset is 5 Mhz. The repeater's receive frequency is 5 Mhz above its transmit frequency.

OMNI DIRECTIONAL TECH: Used in reference to antennas that radiate equally in all directions in the horizontal plane

OPERATION SECURE DISP: This is a nation wide communications network operating on the HF bands. All state EOCs have these radios. The system is managed by FEMA.

ORI DISP: Abbreviation for originating or issuing agency

ORP (Office of Radiation Protection) HAZMAT: A division of the State Dept of Social and Health Services that monitors radiation levels from X-ray machines and man made problems.

OSCCR ICS: On Scene Command & Coordination Radio. 156.135 Mhz. To provide a two-way radio frequency for "on-scene" command and coordination during a multi-agency response environment in Washington.

OUT BY OCCUPANT FIRE: Fire has been extinguished by the occupants of the property, prior to the arrival of the fire department.

OUT ON ARRIVAL FIRE: A fire found to have been extinguished prior to the arrival of the fire department.

P W FIRE: pressurized water fire extinguisher also known as a pump can

PALPATION EMS: Examination by touch; feeling for irregularities, determining blood pressure by feeling for a pulse (normally used in a noisy environment).

PALPITATION EMS: Rapid, violent or throbbing pulsation, as an abnormally rapid throbbing or fluttering of the heart.

PARALYSIS EMS: Temporary suspension or permanent loss of function, loss of sensation or voluntary motion.

PAROLE LE: A subject after being convicted and sentenced for a felony, serves time in prison. The subject is released prior to the total sentence time. Violating offenders may be returned to custody.

PERICARDIAL SAC EMS: The fibrous membrane covering the heart.

PERITONITIS EMS: Inflammation of the lining of the abdomen. May be caused by perforated GI tract, appendix etc..

PETITIONER LE: In a civil litigation the person or entity bringing suit. In No Contact, Restraining and Protection Orders, the petitioner is the person who was the victim of an assault.

PETIT MAL EMS: Literally "little illness". Mild form of epileptic attack, may involve loss of consciousness, bout does not involve convulsions.


PLACARD HAZMAT: A diamond shape sign mounted on trains and trucks as a warning of materials carried. Most signs include a graphic drawing of product or its results. Below the drawing is the UN#

PLACARD - CORROSIVE MATERIALS HAZMAT: A diamond shape sign WHITE over BLACK in color with a picture of two test tubes, one pouring a liquid on a smoking hand, the other pouring a liquid on to a piece of burned metal

PLACARD - ETIOLOGIC AGENT HAZMAT: A diamond shape sign RED & WHITE in color with a picture of a three semi-circles interconnected with a central circle. This cargo is infectious biological material.

PLACARD - EXPLOSIVES (A) (B) (C) HAZMAT: A diamond shape sign ORANGE in color with a picture of an explosion.

PLACARD - FLAMMABLE GAS HAZMAT: A diamond shape sign RED in color with a picture of a burning flame. Tank may be under extreme pressure.

PLACARD - FLAMMABLE LIQUID HAZMAT: A diamond shape sign RED in color with a picture of a burning flame.

PLACARD - FLAMMABLE SOLID HAZMAT: A diamond shape sign with RED & WHITE STRIPES a picture of a burning flame.

PLACARD - NON-FLAMMABLE GAS HAZMAT: A diamond shape sign GREEN in color with a picture of compressed gas tank horizontal. Note: Contents may be under extreme pressure.

PLACARD - ORGANIC PEROXIDE HAZMAT: A diamond shape sign YELLOW in color with a picture of a burning ball and flame.

PLACARD - OXIDIZER HAZMAT: A diamond shape sign YELLOW in color with a picture of a burning ball and flame.

PLACARD - POISONOUS MATERIAL HAZMAT: A diamond shape sign WHITE in color with a picture of a skull & crossbones.

PLACARD - RADIOACTIVE MATERIALS HAZMAT: A diamond shape sign WHITE in color with a picture of three red half triangles pointing toward a central circle. May have 1, 2 or 3 red bars to indicated hazard level

POLARIZATION TECH: The relationship of electromagnetic waves emitted from an antenna to the horizon. Vertical is perpendicular to the horizon, and is used in land mobile communications. Horizontal is parallel to the horizon, and is used in shortwave/worldwide communications. Circular is neither horizontal or perpendicular and is used for deep space communications.

POMPIER LADDER FIRE: A scaling ladder having a single spar or beam with rungs protruding on either side and a long curved hook which is placed over window sills when used in climbing.

POV - Privately Owned Vehicle

POWER SURGE TECH: A rapid rise in voltage in a line. May be several thousand volts in several nano seconds. Common causes: Line switching by PUD, lightening, large motors (elevators), car vs pole accidents.

PRE-CONNECT FIRE: Fire hoses that are carried connected to the pump eliminating the delay at the fire scene. Common pre-connected attack lines are 1 1/2, 1 3/ 4, 2 1/2 inch hoses. Three 50'sections give 150'reach

PRIVATE LINE (PL) TECH: A trade name of Motorola C & E Inc. SEE: CTCSS.

PROBATION LE: A subject after being convicted and sentenced for a crime, has the jail or prison time suspended for the probation period. If conditions are violated the offender may be returned to custody.

PROM - PROGRAMMABLE READ-ONLY MEMORY TECH: These memories are fuse programmable (burned in). PROMs are non-volatile and programming process is irreversible.

PSAP DISP: Public Safety Answering Point. The location where 9-1-1 calls are received and dispatched.

PSI FIRE: Pressure measured in pounds per square inch

PSTN TECH: Public Switched Telephone Network. All public phone systems

PTT TECH: Push-To-Talk , usually refers to the transmit button or bar on a radio

PUMP CAN FIRE: pressurized water fire extinguisher also known as P W

PUNCH DOWN BLOCKS TECH: Usually found in telephone equipment rooms, they provide termination for 25 pairs of telephone lines for distribution inside a building.

PURPLE K FIRE: A potassium-based dry chemical fire extinguishing agent most effective for class B fires

QUAD FIRE: A quadruple combination fire fighting apparatus carrying water, hose, pump and ladders.

QUINT FIRE: A combination fire fighting apparatus carrying water, hose, pump and ladders and having an aerial ladder.

RADIAX TECH: Similar in construction to heliax with the addition of slots in the hard shield. These slots allow the cable to radiate along it entire length. Used for in building and tunnel antennas.

RADIUS EMS: The outer and larger bone of the forearm, on the side of the thumb.

RCW Revised Code of Washington. The codified laws of the State of Washington.

REACT DISP: Radio Emergency Action & Coordination Team. A nationwide group of volunteers that monitor the citizen band radio channel 9 for emergency communications from motorists in need of assistance.

RECEIVE MULTICOUPLER TECH: A device used to connect several receivers to one antenna and feedline. May also include receiver pre-amplifiers.

RECEIVER TECH: An electronic device capable of receiving electromagnetic transmissions on a specific frequency and converting the transmissions into intelligible sounds or usable data.

REKINDLE FIRE: An instance where fire department is called back to a location where fire has been extinguished because of reignition due to latent heat, sparks or embers. A professional disgrace!

REPEATER TECH: A radio station that receives a signal and retransmits it for greater range. Usually mounted on a high elevation.

REPEATER DISABLE TECH: A control on some dispatch consoles that allows the dispatcher to disable the repeater to prevent rebroadcast of the mobiles transmissions. Also known as repeater knockdown.

RESPONDENT LE: In a civil litigation the person or entity being sued. In No Contact, Restraining and Protection Orders, the respondent is the person who has committed the assault.

RFI TECH: Radio Frequency Interference. Interference to an electronic device.

RISER FIRE: A water main that supplies fire suppression sprinklers on a property. May also include valves, drains, alarm monitoring devices, pressure gauges.

ROM - READ ONLY MEMORY TECH: A factory program that is non-volatile and the programming process is irreversible.

RUN CARD FIRE: A card or computer entry showing fire company assignment for a given alarm response by location. A pre-planned equipment response.

SATELLITE RECEIVER TECH: Usually used in conjunction with repeaters. Two or more satellite receivers and a comparator allows the repeater to hear signals from areas of poor reception.

SCAN TECH: A function associated with a radio that allows the receiver to monitor two or more channels at a time. Each channel is checked sequentially for traffic and stop if the channel is busy.

SCAN TELEPHONE NETWORK TECH: A telephone system used by governmental agencies in the State of Washington for reduced tolls on long distance calls. Managed by the State Dept of Telecommunications, Olympia, WA.

SCBA FIRE: Self Contained Breathing Apparatus. Compressed air breathed by firefighters in hazardous atmospheres. Brand names: MSA, Scott, Survive Air.

SECODE SIGNALING TECH: A type of signaling used in old IMTS phones and by the HEAR System. It uses a rotary dial head to encode dial pulses. Standard tone frequencies are 2805 hz and 1500 hz.

SELECTIVITY TECH: Refers to the ability of a receiver to reject unwanted adjacent channel interference. Measured in dB.

SENSITIVITY TECH: Refers to the ability of a receiver to hear signals. Normally measured in micro volts (uV) (.35 uV is average).

SIMPLEX TECH: A term normally used in relation to VHF and UHF operation, simplex operation means you are receiving and transmitting on the same frequency. ALSO CALLED DIRECT

SIMPLEX REPEATER TECH: A device that records a received message and when the message is complete, keys up the transmitter and replays the message. Recording media may be tape or digital storage devices.

SIMULCAST TECH: The transmitting of the same information, on the same frequency at the same time, from multiple sights. Requires high stability occilators and delay lines for phase correction.

SKIP TECH: A phenomenon that causes radio signals to bounce off the ionosphere and return to earth hundreds or thousands of miles away. More common on Low Band and HF communications.


SNORKEL FIRE: A folding-arm type of hoist used to raise and lower the platform on certain elevating platform apparatus. Sometimes called an articulated boom or cherry picker

SOB EMS: Short Of Breath

SOFT SUCTION FIRE: A method of connecting a pumper truck to a hydrant using a short length of large diameter hose. There actually is no suction, the hydrant provides water under pressure via the steamer port.

SOLAR POWER TECH: A method of generating electricity from sun light. Used in remote sites to charge batteries and operate communications equipment

SPRINKLER FIRE: Equipment for fire control and extinguishment whereby water is piped to specially designed orifices or sprinkler heads distributed throughout a property. Temperature operated.

STANDPIPE FIRE: A permanent pipe installed in a building with inlets on the street level and outlets on each floor and for the exclusive use of the fire department. Has 2 1/2 inch hose connections.


STATION LICENSE TECH: The authorization issued by the Federal Communications Commission to operate a radio station. Assigns frequency(s), call sign, and area of operation.

STEAMER PORT FIRE: The largest connection on a fire hydrant, it can deliver several thousand gallons per minute depending on pressure to the soft suction input of a pumper truck.

STOMA EMS: A permanent surgical opening. The stoma is used to by-pass the natural opening in the body. Stomas may be found in the neck for breathing (tracheostomy)or in the abdomen for the excretion of urine (urostomy) or fecal body waste (colostomy).

SUPPORT NET ICS: A radio network for non-tactical communications such as requests for resources and logistic support.

SYNCOPE EMS: Fainting - a syncopal episode

SYSTOLE EMS: The contraction portion of the heart beat (systolic pressure, maximum blood pressure), the upper term in a blood pressure: asystole, faulty contraction of the heart.

TACHYCARDIA EMS: Abnormal rapidity of the heart.

TACTICAL NETS ICS: The radio network of the combat/suppression/rescue units. Multiple networks are possible. Local channels are normally used.

TAPPED FIRE FIRE: All visible fire has been extinguished. SEE ALSO: UNDER CONTROL.

TELEMETRY EMS: Transmission of medical information by radio or telephone ie: EKG transmission from medic unit to hospital.

TELEMETRY TECH: Remote operation and/or monitoring of equipment by telephone or radio.

TENSION PNEUMOTHORAX EMS: A condition that develops when air is continually pumped into the chest cavity outside of the lungs and is unable to escape; it is associated with compression of the lung and heart.

THERMOELECTRIC TECH: A method of generating electricity at remote sites. Current is generated by heating and cooling coils of wire to induce an electrical current. Propane or LPG are the most common fuels

THORAX EMS: The chest.

TIA EMS: Transient Ischemic Attack. Usually a temporary condition in the brain with symptoms similar to a stroke or CVA.

TIBIA EMS: The inner and larger of the two bones which extend from the knee to the ankle.

TIME DIVISION MULTIPLEX (TDM) TECH: A term usually associated with computer and digital communications. In TDM a given channel is shared in time. Different signals must alternate or take their turn, one at a time.


TRACHEA EMS: The wind pipe.

TRACHEOSTOMY EMS: An opening in the trachea made by an operation for use as an airway.

TRAIN CONSIST HAZMAT: A list of cargo carried by a train from front to rear. Copies kept by engineer and conductor. In train yard kept by yard master.

TRANSCEIVER TECH: An electronic device made up of both a receiver and a transmitter.

TRANSMIT MULTICOUPLER TECH: A device used to connect several transmitters to one antenna and feedline.

TRANSMITTER TECH: An electronic device that takes information (data,sound,video) and transmits the information as an electromagnetic wave on a specific frequency.

TRAUMA EMS: An injury inflicted, usually more or less suddenly, by some physical agent.

TRIAGE EMS: From the French language to sort. Used by EMS to set priorities in providing care to multiple patients.


TRUNKING TECH: A computer controlled method of assigning a calling unit to a clear channel. Units are assigned groups instead of specific frequencies. If one unit transmits all others in the group also switch.

TTD DISP: TeleType for the Deaf.

TWO AND A HALF INCH FIRE: Standard size fire hose attack line

TWO-TONE TECH: A method of signaling. Used primarily in pagers

UHF-T BAND TECH: Frequency range of 470 - 512 Mhz. The "T" stands for television. This band is channels 14 - 20 on the UHF TV band. Special authorization from the FCC is required here.

ULCER EMS: A lesion on the surface of the skin or membrane, usually accompanied by inflammation.

ULNA EMS: The inner and smaller bone of the forearm, on the opposite side from the thumb.

UNDER CONTROL FIRE: A fire sufficiently surrounded and quenched so it no longer threatens destruction of additional property and has reached a phase where overhauling can begin. SEE ALSO: TAPPED FIRE

UNIFIED COMMAND STRUCTURE ICS: All agencies have a jurisdictional responsibility at a multi-jurisdictional incident to contribute to overall objectives, strategies, planning, operations and use of resources.

UNN (UNITED NATIONS NUMBER) HAZMAT: The UNN is printed on DOT placards to warn of dangerous products. UNN is assigned to a specific product and may be cross-referenced in the DOT book.

UPS (Uninterruptable Power Supply) TECH: A device designed to provide a piece of equipment or facility continuous "clean" electric power even when the power goes out. Made up of an inverter, battery bank and battery charger.

UP LINK TECH: The signal transmitted by mobiles or control stations to a repeater, in UHF frequencies it is usually 5 Mhz higher in frequency of the frequency pair.

UPS (Uninterruptible power system) TECH: A battery-powered device for maintaining power to critical equipment if the AC power fails.

USM (United States Marshall) LE: The warrants officers of the U.S Federal Court System. They serve all warrants issued by the Federal Courts and also transport federal prisoners. Police officers of U.S. Territories.

VENTILATION FIRE: The opening of a structure to allow the escape of smoke and hot gasses. Vertical: opening the roof. Horizontal/Cross: opening doors and windows.

VERTEBRA EMS: Any of the bones of the spinal column.

VHF BAND TECH: Frequency range of 150 - 174 Mhz also called high band

VOLATILE MEMORY TECH: Memory storage that is lost when equipment is powered down.

VOLTS TECH: A unit of measure used to describe the force or potential of an electrical current.


VOX TECH: Voice Operated Relay, circuitry that activates the transmitter when the operator speaks into the microphone.

WATER FLOW ALARM FIRE: A type of alarm usually monitored by an alarm company, it indicates that a sprinkler system has been activated.

WATER GONG FIRE: An externally mounted alarm operated by water pressure flowing in a sprinkler system.

WATTS TECH: A unit of measurement for electrical power generated, dissipate or consumed. Calculated by multiplying volts time amps.

WAVE GUIDE TECH: Usually refers to type of antenna line used in microwave. Rigid Wave Guide is made out of hollow metal piping, it may be round, oval, square or rectangular. Size is frequency dependant.

WAYBILL HAZMAT: A list of cargo carried by an individual train car or truck. Copies kept by conductor on a train, by driver on trucks.

WOLFSBURG TECH: A brand of radio equipment used extensively in EMS aircraft. The Wolfsburg radios are operator programmable to come up on any standard land mobile frequency or aircraft frequency.

YAGI TECH: Used in reference to directional antennas used for point-to-point communications