Appendix D

Glossary

CTIA - Cellular Telecommunications Industry Association. An organization which represents wireless carriers and manufacturers.

3-watt booster - For portable phones used in a car kit, raises the transmission power from 0.6 watts to 3 watts, improving reception in fringe areas.

A/B select - enables the user to select either A- or B- side carrier when roaming.

Alphanumeric memory - The ability to store names with telephone numbers.

AMPS - Analog Mobile Phone Service, the standard for cellular service in North America.

Call restriction - User feature that limits phone use.

Call timer - Tracks duration, saves last call time, and may tally total air time.

Call-in absence indicator - Indicates in the phone's display if a call was missed.

Car Phone - A cellular telephone that is permanently installed and integrated into the wiring of a motor vehicle. May be either a hands-free or a hand-held model. Also called a mobile phone.

Car-Mounting kit - Provides a cradle for portable phone in the car. It may connect to car battery and external antenna.

CDMA - Code Division Multiple Access, the second type of digital cellular system to be deployed in the United States (See TDMA).

Data interface - A way to connect either a modem with an RJ-11 jack or a PC Card modem to a cellular telephone for data and fax transmission.

DTMF - Dual-tone multifrequency, refers to the generic name for the touch-tone sounds required for communicating with machines (banking, voice mail, etc.)

Dual-mode - All digital phones work both on digital and analog systems, so they are called dual-mode.

Electronic lock - Prevents phone use; requires user to enter a personal code to unlock the phone.

FARS - Fatal Analysis Sampling System. A census of fatal accidents which result from highway crashes. Sponsored by NHTSA.

GSM - Global System for Mobile Communication. A network which generally covers a fairly broad geographic area and which offers customized travel, financial, reference and commercial information to smart-phone subscribers.

Hand held telephone - a portable model that must be held to the ear and mouth for use. May be transportable, mobile or pocket size. Generally used to describe small, lightweight units.

Hands free telephone - a model that can be used while mounted in a vehicle or placed in a bracket. May use a remote speaker or microphone to improve performance.

LCD - Liquid crystal display, the most common type of cellular telephone display. LCDs are common in watches, computers and small TVS.

LED - Light emitting diode, a small, colored light bulb used typically as an indicator light.

Li-ion - Lithium-ion, state-of-the-art battery material.

Memory effect - The loss of capacity in a nickel-cadmium battery caused by charging the battery before completely discharging it.

Mobile phone - A cellular telephone that is permanently installed and integrated into the wiring of a motor vehicle. May be either hands free or hand held models. Also called a car phone.

NAM - Numerical assignment module, the place where a phone stores its phone number. Having more than one NAM enables users to sign up with more than one carrier to cut down on roaming charges.

NAMPS - An advanced type of analog cellular service that offers some of the same features as a pager.

NASS - National Accident Sampling System. A highway crash data collection system based upon 24 Primary Sampling Units randomly selected from the 48 contiguous states.

NHTSA - National Highway Traffic Safety Administration, U.S. Department of Transportation

NiCd - Nickel-cadmium, a low-quality battery material.

NiMH - Nickel-metal hydride, a medium quality battery material.

Packet radio - A method of transmitting and receiving voice, video or other information and data which can be expressed in digital form, i.e. a series of ones and zeros, in a series of blocks or "data packets" using radio frequency communications equipment.

Pocket phone - A small. lightweight cellular telephone with an integrated battery pack.

Repeater - This refers to communications equipment which receives weak incoming signals and amplifies and retransmits or "repeats" the received incoming signal so that signal reception can be accomplished at greater distances. In a vehicle such a system might be used to improve communications when low power handheld cellular telephones are used. Future vehicles might incorporate a capability that would allow hand-held units to plug into the vehicle to achieve greater power and use of an external antenna.

Roaming - Using a cellular telephone outside the user's home system. Roaming usually incurs extra charges.

Signal strength indicator - Displays strength of radio signal, telling the user if conditions are good for calling.

Soft key - A key located below the display and linked to the bottom section of the display. It performs whatever function is listed on the display.

Standby time - Maximum time that a cellular telephone operating on battery power can be left on to receive calls.

System ID select - Restricts use to a fixed number of cellular systems identified by a five-digit system ID.

Talk time - Maximum time that a phone can transmit on a single battery charge.

TDMA - Time Division Multiple Access, the type of digital cellular system most widely implemented in North America.

Transportable Telephone - Wireless telephone with an external battery pack, usually weights several pounds. Transmission power at least 3 watts. Generally packaged in a carrying case.

An Investigation of the Safety Implications of Wireless Communications in Vehicles Appendix D: Glossary