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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.
114
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 G l l o o s s s s a a r r y y
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