Seen a similar problem at BJC campus. RSSI was strong, but SQE was hovering around 20 dB. 3 buildings were affected by this: EPNEC, MPRB and BJCIH. Remote head-end was at BJCIH. MA 330 was located at BTS 2 Sector 3 along with another MA 330 (for NWT).
Couple of observations here:
All of the RHU outputs were below 10 dBm, and there was NO alarm anywhere.
Since the common element to both of the BUs were the fiber and the MA 330 link, we swapped the fiber jumpers and the fiber strands to a completely new set of fiber. Problem did not clear.
Then we swapped the MA 330s (main and remote). Problem was still persistent.
What resolved the problem?
Input into BU from MA 330 should be close to -20 dBm. However, only way we could bring the SQE up is when we dropped the input to BU from MA 330 to -26 to -27 dBm. Interestingly, none of the BUs went on low DL alarm, but it took care of the problem.
Conclusion:
I feel like this was more of a patch solution to a problem we implemented, and probably did not address the real problem. I still think that the problem is in the MA 330-RB unit. Anyway, it's working well for a few weeks now and we will leave them like that for the time being.
Couple of observations here:
All of the RHU outputs were below 10 dBm, and there was NO alarm anywhere.
Since the common element to both of the BUs were the fiber and the MA 330 link, we swapped the fiber jumpers and the fiber strands to a completely new set of fiber. Problem did not clear.
Then we swapped the MA 330s (main and remote). Problem was still persistent.
What resolved the problem?
Input into BU from MA 330 should be close to -20 dBm. However, only way we could bring the SQE up is when we dropped the input to BU from MA 330 to -26 to -27 dBm. Interestingly, none of the BUs went on low DL alarm, but it took care of the problem.
Conclusion:
I feel like this was more of a patch solution to a problem we implemented, and probably did not address the real problem. I still think that the problem is in the MA 330-RB unit. Anyway, it's working well for a few weeks now and we will leave them like that for the time being.
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