Glossary of Terms
H-8 PN: 10580-00305 Rev. L MS20xxC UG
OSLT : OSLT or Open Short Load Thru calibration method for coaxial line
types. Calibrations standards with known reflection coefficients are
used to calculate the correction factors. Refer to Calibration. Compare
this with SSLT or Offset Short 1, Offset Short 2, Load, Thru calibration
method for waveguide line types.
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).
Return Loss : Return Loss is a measurement (in dB) of reflected energy caused by
impedance mismatch. May also be referred to as S11. Although S11
values are expressed as negative numbers, Return Loss values are
expressed as positive numbers because by definition the ìLossî
expression implies a negative sign. The higher the value, the better the
impedance match (think of a large negative number being less than a
smaller negative number). 40 dB is nearly ideal. Only 0.01 % of the total
transmitted power is reflected if the Return Loss measurement value is
40 dB. A measured value of 0 dB would be a complete reflection, or
stated another way, 100 % of the transmitted power is reflected back.
Return Loss is typically a pass/fail measurement.
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.
SCPI : Standard Commands for Programmable Instruments (SCPI)
SOLT : SOLT or Short Open Load Thru calibration method for coaxial line
types with simple and redundant standards. It is not band-limited. It
requires well-defined standards. It has lower accuracy at higher
frequencies. Calibrations standards with known reflection coefficients
are used to calculate the correction factors. Refer to Calibration.
Compare this with SSLT or Offset Short 1, Offset Short 2, Load, Thru
calibration method for waveguide line types.
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