PTP 800 Link Bounce

Products PTP
1

I've got a PTP800 link on the 11Ghz band at about 3 miles that has ben stable for the past 5 years.

Now the link is bouncing (link loss while it shifts QAM settings). Both ends were set to 256QAM.

Now, to get the link to stop bouncing I need to set one end to limit at 128QAM or the other link at 64QAM.

If I configure Unit A to 256QAM and Unit B to 128QAM, both units settle on 128QAM.

If I configure Unit A to 64QAM and Unit B to 256QAM, that is what I get.

If I configure Unit A to 128QAM and Unit B to 256QAM, It starts bouncing and is unuseable.

I suspect there is an issue with Unit B, but I have no idea where to look or how to resolve.

Any Ideas?

2

Is there an Alarm in the home page of the radios? When you click on it, does it indicate an error? I suggest to look at the diagnostic plots for Vector Error, Receive Power and Link Loss. This will give you an idea of the RF conditions. In 5 years things can change like an increase presence of RF interference, path obstructions, etc. Also look at the detailed counters to see packet drop count on RF and Ethernet.

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