User's Manual

Menus and Parameters
Operation and Administration
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4.2.5.3 Link Quality (SU only)
The Link Quality submenu enables viewing continuously updated information on
the quality of the wireless link. The Link quality submenu includes the following
options:
4.2.5.3.1 Continuous Average SNR Display
The Continuous Average SNR Display option displays continuously updated
information regarding the average quality of the received signal, using Signal to
Noise Ratio (SNR) measurements.
Click the Esc key to abort the test.
4.2.5.3.2 Continuous UpLink Quality Indicator Display
The Continuous UpLink Quality Indicator Display option displays continuously
updated information regarding the average quality of the wireless link to the AU,
using the dynamically updated average modulation level measurements. The Link
Quality Indicator (LQI) calculation is performed using the formula:
LQI = (0.9 x ”Previous LQI”) + (0.1 x ”Last Successful Modulation Level”).
Each successful transmit will be included in this average, by using the
modulation level in which the frame was successfully transmitted as the “Last
Successful Modulation Level”.
In order to receive quick and reliable LQI measurements, there should be
sufficient traffic between the SU and the AU. It is recommended to have traffic of
at least 100 packets per second. The traffic can be generated either by an
external utility (FTP session, ping generator, etc.) or by the Ping Test option in the
Site Survey menu with the appropriate settings (see section 4.2.5.2
).
NOTE
If Limited Test is indicated next to the LQI results, it means that the results may not indicate the true
quality, as not all modulation levels from 1 to 8 are available. The limitation may be due to the HW
of the unit (HW Revision A), or the applicable parameters in the country code, or the configurable
Maximum Modulation Level parameter.
Click the Esc key to abort the test.
4.2.5.4 MAC Address Database
4.2.5.4.1 MAC Address Database in AU
The MAC Address Database option in the AU displays information regarding the
Subscriber Units associated with the AU, as well as bridging (forwarding)
information. When DRAP is supported, it enables viewing details on the active
Gateways in the sector. The following options are available: