EXPRESS DAS
Installation and Operations Manual
114
EXPRESS DAS Installation and Operations Manual – Version 2.2 November 2013
12.6.2 Validating the Downlink Path
1. Using the signal generator, set the desired Tx frequency and the output power to 0dBm.
2. Using the spectrum analyzer, verify the power level at the end of the cable connecting to the MDBU Tx
port at the BIU.
3. Using the spectrum analyzer, check the levels coming from the Tx monitor test ports at the front of the
MDBU. When the signal source is 0dBm, this value should be -20dBm.
4. Using the spectrum analyzer, check the levels coming from the BIU ODU Tx port.
5. Using the spectrum analyzer, check the levels at the end of the cable connection to the Tx port on the
ODU.
6. In the management software, verify the LD optical power.
7. Using the spectrum analyzer, check the levels coming out of the antenna port at the bottom of the
MRU.
Figure 12.10 – Validating the Downlink Path
Step /
Band
800
850
900
1900
2100
1
0dBm
0dBm
0dBm
0dBm
0dBm
2
0dBm±1dB
0dBm±1dB
0dBm±1dB
0dBm±1dB
0dBm±1dB
3
-20dBm±2dB
-20dBm±2dB
-20dBm±2dB
-20dBm±2dB
-20dBm±2dB
4
-8dBm±2dB
-8dBm±2dB
-8dBm±2dB
-8dBm±2dB
-8dBm±2dB
5
-8dBm±2dB
-8dBm±2dB
-8dBm±2dB
-8dBm±2dB
-8dBm±2dB
6
+7dBm±1.5dB
+7dBm±1.5dB
+7dBm±1.5dB
+7dBm±1.5dB
+7dBm±1.5dB
7
+25dBm±2dB
+26dBm±2dB
+25dBm±2dB
+30dBm±2dB
+30dBm±2dB
Table 12.4 – Recommended Test and Link Budget Values Per Band for Downlink Path
If the measured values for your system match the table above, congratulations! You have successfully
completed the installation and commissioning process. If not, consult the tables below, which explain fault
indicators and suggested remedies.
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