S820E UG PN: 10580-00343 Rev. H C-11
Glossary C-2 Glossary Terms
OBW : Occupied Bandwidth (OBW) is a measure of the
bandwidth containing 99% of the total integrated power
of the transmitted spectrum, centered on the assigned
channel frequency. Interference to other channels or to
other systems can occur if OBW is too large.
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).
RF : Radio Frequency (RF) is the frequency of radio sine
waves. RF generally refers to wireless communications
within a frequency range of 3 kHz to 300 GHz.
Formally, according to the Article 2 of the Radio Law,
radio frequency is below 3,000 GHz. Radio frequencies
can be used for communications between a mobile
telephone and an antenna mast.
VSWR : Voltage Standing Wave Ratio (VSWR). VSWR is
another method to measure reflected energy caused by
impedance mismatch. It is expressed as a ratio of X:1.
VSWR measures the voltage peaks and valleys. A ratio
of 1:1 would be a perfect match. A typical cable and
antenna system would be around 1.43:1 (VSWR) or 15
dB Return Loss. The Site Master can measure either
Return Loss or VSWR. Some carriers require that
Return Loss is measured in VSWR. This is typically a
pass/fail measurement.
Watt : Watt (w) is a unit of measure for power.
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