Product Info

Infinet Wireless: Technical Documentation – InfiMAN Evolution
Operation & Administration – 88
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39 Figure - Alignment test - graphical indicator
The main indicator is the Input Signal stripe.
The height of the Input Signal stripe is measured in dB by the Input Signal Level scale. The higher the stripe is, the
stronger the signal is.
The stripe may change its position along the Cross Fading scale, showing how much influence the corresponding
device antenna has (for example: how much vertically and horizontally polarized signals influence each other).
Higher the value of the stripe according to the Cross Fading scale (the farther stripe is from the 0 dB value), less the
influence antennas have on each other.
The top of the Input Signal stripe can be located in black (Good signal) or red (Bad signal) background areas or
somewhere in between them. This means the signal is good, bad or average correspondingly. When aligning the
antenna, it is recommended to try achieving the stripe top to be located in the black area.
At the bottom of the Input Signal stripe may appear a special red sub-stripe. This sub-stripe indicates the presence
of the packet retries and the percentage of the total number of transmitted packets.
During the alignment test, the Input Signal stripe may change its position along the Cross Fading scale and increase
or decrease in height, indicating the changes in the received signal. When the top of the stripe changes its location,
moving from one point on the background area to another, it leaves pink and blue marks behind, indicating the
maximum and minimum measured levels of the signal at a particular point. Thus, it makes possible to observe the
“history” of the signal changes.
You can clear the marks by clicking the «Clear History» button at the bottom of the page.
The text indicators are:
"RSSI" - indicates the power level of the received radio signal (measured in dBm), optimal parameter
value-60 ... -40.
"CINR" - input signal level to noise + interference (measured in dB) indicator, >=28.
"Crosstalk" -indicateshow much vertically and horizontally polarized signals influence each other, >20.
"Error Vector Magnitude (EVM)" - indicator of the measured input signal quality (it should be as high as
possible in absolute value, the recommended level is not less than 21 dB. Some old firmware had EVM value
positive, but most the firmware has negative value, so for the troubleshooting, evaluate the absolute EVM
value), > 21 in absolute value.
"Tx bitrate" - displays the current bitrate for the remote and local units (measured in Kbps).
Main recommendations when using the “Antenna Alignment" tool:
It is recommended to start antenna alignment with searching the maximum signal level on a minimal
possible bitrate. Afterwards, automatic MINT mechanisms will set the most appropriate bitrate when
“Autobitrate” mode is enabled.
Input signal level (CINR) should be between 12 dB and 50 dB.
If signal level is more than 50 dB, it is recommended to lower the amplifier power.
If maximal signal level is less than 12, it is recommended to lower the channel width (for example: from 20
MHz to 10 MHz).