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LINK indicator
Checking the Status of Radio Links
Use a multimeter to measure the RSL (P1) on the RSSI port of the horizontally-polarized ODU at the local end.
Power on the vertically-polarized ODU at the local end. Use a multimeter to measure the RSL on the RSSI port of
the vertically-polarized ODU. Release the holders of the feed boom and turn the feed boom gently until the RSL
reaches the minimum value (P2). The calculated XPD1 (XPD1 = P1 - P2) cannot be lower than 24 dB. Record the
current angle (D1) of the feed boom.
Power off the horizontally-polarized ODUs and power on the vertically-polarized ODUs at both ends of the radio
link. Adjust the azimuth and pitch angle of the antennas by referring to the description in "Aligning Single -
Polarized Antennas". Ensure that the main lobes of the vertically-polarized signals are aligned.
Refer to Steps 3 and 4 to ensure that the calculated XPD2 (XPD2 = P3 - P4) is higher than or equal to 24 dB.
Record the current angle (D2) of the feed boom.
Repeat Steps 1 to 6 to gently adjust the feed boom (ranging from D1 to D2), and ensure that XPD1 and XPD2 are
higher than or equal to 24 dB.
Tighten all the screws on the antennas after the alignment is completed.
Check the status of the LINK indicator on the front panel of the chassis.
If the LINK indicator is on (green), the radio link is functioning properly.
If the LINK indicator is on (red), check whether the configuration data is correct. If the configuration data is
incorrect, configure correct data.
If the LINK indicator blinks yellow at intervals of 300 ms, check whether the antennas are aligned properly. If the
antennas are not aligned properly, realign the antennas.
If the LINK indicator is off, check whether the logical units of the IF unit and the ODU have been added on the
NMS. If yes, check for a fault in the IF jumper, IF cable, or the ODU.
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