Alvarion BreezeMAX PRO 5000 CPE, Руководство по эксплуатации продукта

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Chapter 3 - Commissioning Aligning the PRO CPE’s External Antenna
BreezeMAX PRO 5000 CPE 39 Product Manual
3.4 Aligning the PRO CPE’s External
Antenna
In order to achieve better link quality in units with external antenna, use the
following steps to align the external antenna rather than the CPE itself.
1
Verify that the the unit is synchronized with a Base Station and ensure that all
parameters are configured properly. If the unit is still not synchronized with a
Base Station, improve the quality of the link by changing the direction of the
antenna or by placing the antenna at a higher or in an alternate location.
2
Rotate (and/or tilt if applicable) the ODU/antenna until the maximum link
quality (SNR and RSSI) 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.
3
Secure the ODU/antenna firmly to the pole.
To align the external antenna:
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.
CAUTION
In some cases, the antenna may need to be tilted to ensure that the level at which the CPE receives
transmissions from the BTS (and vice versa) is not too high. When the RSSI reading is higher than
-20 dBm, 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 CPE is located at a distance of less than 300 meters
from the BTS, it is recommended to up-tilt the antenna by approximately 10° to 15°.