User's Manual

98
Copyright © 2004-2012 by InfiNet Wireless
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, 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 exploited.
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. If this value is
constantly not less then 50 then most probably «distance» parameter is
set with a wrong value. If radio link distance is more than 20 km then
«long» mode must be enabled.
ALL described parameters must be observed in the both (Local and Remote)
sections of the «ltest» command output.
Alignment mode (for Xm-series only):
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 devce divided by “:” correspondingly.
To start Ltest in this mode:
lt rf5.0 <Mac-adress> -align [L,R]
Ltest output in alignment mode:
Bandwidth mode (Bandwidth meter):
Bandwidth meter is used to test the following radio link characteristics:
throughput in kilobits per second, packets per second, number of retries and
errors.
Use the following «
ltest » command options for testing: