260-668080-001 Rev 002 March 2013 29
Eclipse Edge User Manual
• RSL Measurement Guidelines
Using RSL Data
As Portal is accessed via PC connection to the IDU, a separate means of
communication such as two-way radio or cell phone is required between the Portal
operator and the person at the antenna.
To align using RSL:
1. Monitor RSL in the Portal performance screen.
2. Set antenna alignment for maximum RSL.
3. Repeat for the far end of the link.
4. Compare measured RSLs with the expected RSLs from the link installation
datapack. Measurement accuracies are:
± 2 dB for levels -40 to -70 dBm, over a temperature range of 0 to +35
o
C.
± 4 dB for levels -25 to -85 dBm, over a -33 to +55
o
C range. Applies where levels
and/or temperatures are beyond those specified for ± 2 dB.
Using the RSSI Voltage at the ODUspe
A voltmeter, such as a multimeter, is used to measure RSSI voltage at the BNC
connector on the ODUspe. A suitable BNC to banana-plug connecting cable is
available as an optional ODUspe accessory.
To align an antenna using RSSI:
1. Connect the voltmeter to the BNC connector. Center pin is positive. Use a low
voltage range for best resolution, nominally 2.5 Vdc FSD.
2. Set antenna alignment for a minimum voltmeter reading.
3. Repeat for the far end of the link.
4. Check and record the peak voltage at each end. The RSSI voltage provides a direct
relationship with RSL. An RSSI of 0.25 Vdc ≡ -10 dBm RSL, and each additional
0.25 Vdc RSSI increase thereafter corresponds to a 10 dBm decrease in RSL, as
follows:
5. Compare actual RSLs to the expected RSLs from the link installation datapack.
Refer to RSL Measurement Guidelines.
6. Replace the BNC weatherproofing cap.
Failure to replace the RSSI BNC weatherproof cap may result in
damage to the ODU.
Units Measurement
BNC (Vdc)
0.25 0.5 0.75 1.0 1.25 1.5 1.75 2.0 2.25 2.5
RSL (dBm)
-10 -20 -30 -40 -50 -60 -70 -80 -90 -100
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