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G l o s s a r y
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.
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DTMF - (Dual-tone Modulated Frequency ) You send
DTMF signals when you enter numbers by
pressing the digit keys.
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.
G l o s s a r y
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