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VX3400 79
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.
SID is used by mobile phones to
recognize when they are in their home
system and can be used for billing
purposes as a unique identification of
the serving system.
SMS Short Message Service is a service
available on most digital mobile phones
to send messages between phones or
other devices. Messages are routed a
Short Message Service Center (SMSC),
which attempts to send the message
and, if unsuccessful, possibly retry at a
later time. Message delays or message
loss is possible, especially when
sending between networks. Users can
request delivery confirmation reports.
TTY Teletypewriter. An electromechanical
typewriter that either transmits or
receives messages coded in electrical
signals. A phone with TTY support is
able to translate typed characters to
voice or translate voice into characters
to display on the TTY.
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