B-12 PN: 10580-00321 Rev. M S331L UG
B-2 Glossary Terms Glossary of Terms
Remote Access
Point : Remote Access Point, also known as relay access
point, is one of a number of secondary access
points in a wireless network that uses Wireless
Distribution System (WDS) to extend its range.
Remote access points connect to a master access
point.
Return Loss : Power loss in a transmission cable due to
mismatch reflection, cable loss, etc.
RF : Radio Frequency (RF) generally refers to wireless
communications with frequencies below 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.
RSSI : Received Signal Strength Indicator (RSSI) is a
measurement of the power present in a radio
signal when received and measured. RSSI is
useful for observing signal strength at a single
frequency over time.
Signal loss : Signal loss is the amount of signal strength that’s
lost in antenna cable, connectors, and free space.
Signal loss is measured in decibels.
Smith Chart : A Smith Chart is a graphical aid for electrical and
electronics characteristics in radio frequency (RF)
circuits. Smith Chart was invented by Phillip
Smith at Bell Laboratories in 1939. The chart can
be used to display multiple parameters, such as
impedance, and admittance.
SOLR/SSLR/SSSR : Short-Open-Line-Reciprocal (SOLR),
Short-Short-Line-Reciprocal SSLR), and
Short-Short-Short-Reciprocal (SSSR) are
calibrations similar to SOLT/SSLT/SSST, but
used when a good Thru is not available. They have
some accuracy degradation due to a less defined
Thru and have disadvantages of the parent
calibration.
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