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102 VX5300
Glossary
Acronyms and Abbreviations
DTMF Dual-Tone Multi Frequency (or “touch-
tone”) is a method used to communicate
keys pressed on the phone. Pressing a
key generates two simultaneous tones,
one for the row and one for the column
to determine which key was pressed.
EMS Enhanced Messaging Service is an
extension to SMS for cellular phones
available on specific networks. An EMS
enabled phone can send and receive
messages with special text formatting
(such as bold or italic), animations,
pictures, icons, sound effects, and
special ring tones. EMS messages sent
to non-EMS devices will be displayed as
SMS transmissions.
ERI Enhanced Roaming Indicator is a feature
to indicate whether a mobile phone is on
its home system, a partner network, or a
roaming network. Many phones indicate
home vs. roaming as an icon, but ERI
capable phones can clearly indicate
third “partner network” status.
GPS Global Positioning System is a system of
satellites, computers, and receivers able
to determine the latitude and longitude
of a specific receiver on Earth. Position
is calculated using time and distance.
IS 2000 Type of digital signaling. It's the second
generation of CDMA digital cellular, an
extension of IS-95. Differences between
signaling types have to do with pilot
signal and links to provide more traffic
channels, and control protocols.
NAM Number Assignment Module is how the
phone stores the phone number and its
electronic serial number. A multiple
NAM phone can register with multiple
service providers and be set to
automatically switch between
programmed phone numbers for service
provider areas.
SID System Identification is a number
transmitted by base stations to identify a
wireless system which conforms to a
TIA cellular or PCS standard.