Glossary of Terms D-2 Glossary of Terms
S412E UG PN: 10580-00318 Rev. P D-9
OTA : Over The Air (OTA): OTA refers generally to any transfer of information
or signal that takes place in a wireless environment, rather than using
a wired connection. OTA is usually used in connection with a standard
defining the provisioning of mobile devices and applications, such as
downloading or uploading content or software, and commonly used in
conjunction with the Short Messaging Service (SMS). SMS OTA
Messages contain information that is used to configure the settings of a
WAP browser in a mobile phone (refer to SMS and WAP).
P25 : An set of open interface communication standards.
PTC : Positive Train Control (PTC) is a system that provides railway safety
for trains and workers. The American Railway Engineering and
Maintenance-of-Way Association (AREMA) organization describes PTC
as having the following primary characteristics: 1] train separation for
collision avoidance, [2] enforcement of line speeds, [3] temporary speed
restrictions, and safety of wayside rail workers. Ing PTC, movement
authority and train location (via GPS) are available by utilizing wireless
technologies.
SINAD : Signal-to-Noise And Distortion (ratio) (SINAD)
TETRA : Terrestrial Trunked Radio (TETRA) (new name)
TFT : Thin-Film Transistor/Thin-Film Technology (TFT)
TMA : A Tower Mounted Amplifier (TMA) amplifies signals from an antenna
to reduce the noise figure of a base transceiver station (BTS). This helps
to improve the overall sensitivity of the BTS. A TMA is a low-noise
amplifier (LNA) that is usually mounted as close as practical to the
antenna in Base Transceiver Stations or in mobile masts. When using a
TMA, the antenna is able to receive weaker signals.
TTL : Transistor-Transistor Logic (TTL)
VSWR : Voltage Standing Wave Ratio (VSWR)
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