Alvarion BreezeMAX PRO CPE, Manual

Page: 42 / 75

Chapter 3 - Commissioning
3.2 Aligning the Subscriber Unit Antenna
The LINK QUALITY bar display is located on the bottom panel of the outdoor unit.
LED 1 (WLNK) indicates that the wireless link is active, and is lit when the SU
has completed the Network Entry process. LEDs 2 to 9 indicate the quality of the
received signal. The higher the number of LEDs that are on, the better the quality
of the received signal.
The link quality can be estimated more accurately using the Link Quality Display
option in the SU Installer Monitor program. Refer to Section
4.8.1 for more details
on this option.
This section describes how to align the Subscriber Unit antenna using the LINK
QUALITY bar display or the Start Link Quality Display option of the Monitor
program.
To align the Subscriber Unit antenna:
1
Point the antenna towards the general direction of the Base Station.
2
Verify that the power indication of the unit is on.
3
Verify that at least one LED (LED 2) of the LINK QUALITY bar display is on,
indicating that the unit is synchronized with the AU. If the SU is not
synchronized with the AU, ensure that all parameters are configured properly.
If the unit is still not synchronized 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 Link Quality reading is achieved. If
you encounter prolonged difficulty in achieving the expected link quality, try
to improve the reception quality by placing the antenna at a higher point or in
an alternate location.
NOTE
Ensure that the front of the antenna is always facing the Base Station. However, in certain
conditions, such as when the line of sight to the Base Station is hampered, better reception may be
achieved using a reflected signal. In this case, the antenna is not necessarily directed toward the
Base Station.
5
Secure the unit firmly to the pole.
CAUTION
In some cases, the antenna may need to be tilted to ensure that the level at which the SU receives
transmissions from the AU (and vice versa) is not too high. When all LINK QUALITY LEDS are on,
including LED 10. This indicates that the received signal level is too high (saturation). This must be
avoided, preferably by up-tilting the antenna. As a rule of thumb, if the SU is located at a distance
of less than 300 meters from the AU, it is recommended to up-tilt the antenna by approximately 10
°
to 15
°
.
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