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Glossary
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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.
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.
EVDO Evolution Data Only or Evolution Data
Optimized (abbreviated as EVDO, EV-DO,
EvDO, 1xEV-DO or 1xEvDO) provides fast
wireless broadband access (3G) anywhere,
without needing a WiFi hotspot.
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.
SSL Secure Sockets Layer Protocol used to
encrypt data sent over the air.
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.