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Glossary of Terms
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Glossary of Terms
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 lightwave information signal. A sig-
nal’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 hold-
ing 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 illuminates on the
phone to indicate an incoming call. The LED
illuminates on the charger to indicate that bat-
tery charging is taking place.
NAM - (Number Assignment Module) North American
cellular systems use a NAM which consists of
customer information (such as phone number,
system identifier, etc.).
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 an RF anten-
na is determined, in part, by the frequency
of the signals used.
Base Station - The fixed radio transmitter/receiver
that maintains communications with
mobile radio telephones within a given
area. (Typically called 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 on the network.
DTMF - (Dual-Tone Multi-Frequency) You send DTMF
signals when you enter numbers by pressing
the digit keys.
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