User's Manual

Chapter 4 - Link Configuration Link Diagnostic Tools
Alvarion BreezeNET B130/B300 GigE 53 Technical User Manual
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 if autobitrate mode will be enabled.
2 Current incoming signal level in "amp/max" columns (see "ltest" command
output) must be between 12 and 40.
When it is more than 40 it is recommended to lower amplifier power.
If maximal signal level is less than 12 it is recommended to lower bitrate or
channel width (for example, from 20MHz to 10MHz on the both sides of the
radio link).
In some cases signal level that is less then 12 may be enough for radio link
operation. In this case one has to be guided by such parameters as number of
retries, number of undelivered packets and number of undelivered acks. If the
number of undelivered packets and the number of undelivered acks is null,
the number of retries is small and all these parameters are constant in time
then the radio link, most often, will be operating properly.
3 Number of retries value in "rt%" columns must be as close to zero as possible.
4 Number of undelivered packets value in "up%" columns must be zero; if this
value is not zero then the radio link couldn't be exploit.
5 Number of undelivered acks value in "ua%" columns must be zero; if this value
is not zero then the radio link couldn't be exploit.
ALL described parameters must be observed in the both (Local and Remote)
sections of the "ltest" command output.
Alignment mode:
The difference of this mode from the standard one is that "ant.amps" column is
used instead of "amp/max". "Ant.amps" column indicates signal levels for each of
two antennas of a device divided by ":" correspondingly.
To start Ltest in this mode:
Ltest output in alignment mode:
ltest rf5.0 <Mac-address> -align [L,R]