User's Manual

Appendix
92
Environmental Protection Agency (EPA):
http://www.epa.gov/radiation/
Occupational Safety and Health Administration’s
(OSHA):
http://www.osha-slc.gov/SLTC/
radiofrequencyradiation/index.html
National Institute for Occupational Safety and
Health (NIOSH):
http://www.cdc.gov/niosh/emfpg.html
World health Organization (WHO):
http://www.who.int/peh-emf/
International Commission on Non-Ionizing
Radiation Protection:
http://www.icnirp.de
National Radiation Protection Board (UK):
http://www.nrpb.org.uk
Updated 4/3/2002: US Food and Drug Administra-
tion http://www.fda.gov/cellphones
93
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.