Hi All, We're experiencing a very weird and very intermittent issue with an AirFiber 5x Link.
For the past few weeks, we experience a one way drop in modulation - all the way down to 1/4x (QPSK). This occurs at random times of the day or night, lasting between 5 minutes to 2 hours, and then fixes itself. It occurs randomly from one to three times in a 24 hour window on average, and doesn't seem related to traffic load. The link has been in and operational for the best part of 2 years with no problems whatsoever. The path is 14.2KM (~9mi), 600mm dishes (45deg offset ones) operating on a 30MHz channel and holds 64QAM. We've tried moving channels but that hasn't helped. The signal on both chains (1 and 0) at both ends doesn't change at all during the event (between -60 and -58 across all). There is no environmental changes during these events (such as rain, etc). I've spent hours reading the ubiquiti forums, and I'm still at a loss as to what could cause the issue. We are operating on old firmware, and I did see one post mention that the duty cycle was incorrect in a firmware revision (we run at 50/50) but that seems very anecdotal. Our only option at this stage is to replace the units. I'm guessing it'll need to be both ends, as we don't know if its RX on one unit or TX on the other. I just thought I'd check in on the off chance anyone may have a suggestion before we go climbing... Cheers, Mark
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