Airtime - Actual time spent talking on the wireless
phone. Most carriers bill customers based
on how many minutes of airtime they use
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
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.
Coder/Decoder - Compression & Decompression.
Deactivation - The process of rendering a wireless
DTMF - (Dual-Tone Multi 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).
LCD - (Liquid Crystal Display) Commonly used to
refer to the screen display on the wireless
Prepend - The addition of a prefix, such as an area
code, to a phone number.
G G l l o o s s s s a a r r y y