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Glossary
Airtime
- Actual time spent talking on the
wireless phone. Most carriers bill customers based
on how many minutes of airtime they use each
month.
Antenna
- A device for transmitting or receiving
signals. The size and shape of antennas is
determined, in part, by the frequency of the signal
they receive. Wireless phones and the base
station must have antennas.
Base station
- The fixed radio transmitter/
receiver that maintains communications with
mobile radio telephones within a given area.
(Typically called a cell or cell site)
CDMA
- (Code Division Multiple Access) A spread-
spectrum approach to digital transmission. With
CDMA, each conversion is digitized and then
tagged with a code. The mobile phone deciphers
only a particular code to pick the right
conversation off the air. The transmitted signal is
just above noise level across the available
bandwidth.
Channel
- Communications signals transmit along
paths called channels.
Codec
- Compression & Decompression.
Deactivation
- The process of rendering a
wireless phone inactive.
DTMF
- (Dual-tone Multi-Frequency) You send
DTMF signals when you enter numbers by
pressing the digit keys.
Glossary
101
EVRC
- (Enhanced Variable Rate Codec) EVRC is a
new global standard for compressing and
decompressing voice signals. EVRC uses a lower
bit rate (the number of bits sent per second) than
existing CDMA vocoders, while providing
significant improvements in voice quality. This
technology enables your phone to provide superb
voice quality while benefiting from the ability to
process more cellular voice calls using less
bandwidth than the voice codecs in CDMA
networks today.
Frequency
- A measure based on time, as one or
more waves per second, in an electrical or light
wave information signal. A signal’s frequency is
stated in cycles-per-second or Hertz (Hz).
Hands-free
- A feature that permits a driver to
use a wireless phone without lifting or holding the
handset - an important safety feature for
automobiles, tractors and most other motorized
vehicles.
LCD
- (Liquid Crystal Display) Commonly used to
refer to the screen display on the wireless phone.
LED
- (Light Emitting Diode) Commonly used to
refer to a small light on the wireless phone or on
the Desktop Charger. The LED lights on the phone
to indicate an incoming call. The lights on the
charger indicate that battery charging is taking
place.
Prepend
- The addition of a prefix, such as an
area code, to a phone number.
RF
- Radio Frequency
Roaming
- The ability to use a wireless phone to
make and receive calls in places outside of the
home service area.