Here is the bit from the manual about aligning the CPE using the alignment meter. Please let me know what is missing and why RSSI is needed in addition.
- Patrick >From section 3.2, page 49 (of 277) of the VL System Manual, July 2006 Aligning the Subscriber Unit Antenna The SNR bar display is located on the bottom panel of the outdoor 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. NOTE 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. 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°. To guarantee a safety margin from the saturation level (received signal of -40 dBm at the antenna port), the SNR should not be higher than 50 dB. The orange LED of the SNR bar indicates that the SNR is higher than 50 dB. Patrick Leary AVP WISP Markets Alvarion, Inc. o: 650.314.2628 c: 760.580.0080 Vonage: 650.641.1243 ************************************************************************************ This footnote confirms that this email message has been scanned by PineApp Mail-SeCure for the presence of malicious code, vandals & computer viruses. ************************************************************************************ -- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
