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Chapter 3 - Commissioning
BreezeACCESS VL System Manual
76
3.3 Aligning the Subscriber Unit Antenna
NOTE
This antenna alignment process described in this section is applicable to both the SU-A-ODU and
the SU-I antenna, unless stated otherwise.
The SNR bar display is located on the bottom panel of the SU-A-ODU/front panel
of the SU-I indoor unit. The ten LEDs indicate the quality of the received signal.
The higher the number of green LEDs indicating On, the higher the quality of the
received signal. This section describes how to align the Subscriber Unit antenna
using the SNR bar display.
NOTE
Antenna alignment using the SNR bar display is possible only after the Subscriber Unit is
associated with an Access Unit. The associated Access Unit must be operational and the basic
Subscriber Unit parameters must be correctly configured. Otherwise, the unit will not be able to
synchronize with the Access Unit. As the SNR measurement is performed on received frames, its
results are meaningless unless the Subscriber Unit is associated with an Access Unit.
To align the Subscriber Unit antenna:
1 Align the antenna by pointing it in the general direction of the Base Station.
2 Verify that the power indication of the unit (
/ )is On.
3 Verify that the W-LINK LED (
/ ) of the ODU is On, indicating that the unit
is associated with an Access Unit. If the W-LINK LED is Off, check that the
ESSID and Frequency parameters are correctly configured. If the SU is still
not associated with the AU, increase the transmit power level to its maximum
value. If the unit is still not associated with the AU, improve the quality of the
link by changing the direction of the antenna or by placing the antenna at a
higher or alternate location.
4 Rotate the antenna until the maximum SNR reading is achieved, where at
least 1 green LED is on. If you encounter prolonged difficulty in illuminating
the minimum required number of green LEDs, try to improve the reception
quality by placing the antenna at a higher point or in an alternate location.
5 Ensure that the front of the antenna is always facing the Base Station.
However, in certain conditions, such as when the line of site to the Base
Station is hampered, better reception may be achieved using a reflected
signal. In this case, the antenna is not always directed toward the Base
Station.
6 Secure the unit firmly to the pole (SU-A-ODU)/fasten the rotation screws (SU-
I antenna).