User's Manual

Chapter 5 - Configuration Via Web Interface Device Status
Alvarion BreezeNET B130/B300 GigE 83 Technical User Manual
The Input Signal stripe may itself change the color indicating the quality of the
received signal (EVM). The possible stripe colors are:
 Green - signal quality is good
 Yellow - signal quality is worse but acceptable
 Red - signal quality is bad.
During alignment test the Input Signal stripe may be moving along Cross Fading
scale and increase or decrease in height indicating the changes in the received
signal. When the top of the stripe is changing its location moving from one point
on the background area to the other it commonly leaves pink and blue marks that
indicate measured maximum and minimum levels of the signal at the particular
point. Thus it makes possible to observe the "history" of the signal changes. To
clear the marks use "Clear History" button at the bottom of the page.
Main recommendations when using "Antenna alignment tool":
1 It is recommended to start antenna alignment with searching maximum signal
level on a minimal possible bitrate. Afterwards automatic MINT mechanisms
will set the most appropriate bitrate when "Autobitrate" mode will be enabled.
2 Input signal level should be between 12 and 50. ATPC is recommended to be
enabled.
If signal level it is more than 50 it is recommended to lower amplifier power
(ATPC will do it automatically).
If maximal signal level is less than 12 it is recommended to lower channel
width (for example, from 20MHz to 10MHz).
In some cases signal level that is less than 12 may be enough for radio link
operation. In this case one has to be guided by such parameters as number of
retries and Error Vector Magnitude. If the number of retries is small and EVM
is more than 21 (Input Signal stripe is green) then the radio link, most often,
will be operating properly.
3 Retries value should be zero or as low as possible.
4 The top of an Input Signal stripe should be located in the black area.
5 The signal quality should be good: EVM value should be more than 21, Input
Signal stripe color should be green.