From my experience its always either cable, crimps, leads or surge suppressors.
- Not all outdoor UV shielded Cat5e cables are made equal, also don’t use CCA cable under any circumstances. Rugged UV exterior with inner earth wire with foil shield wrap.
- Recrimp every connection. The smart ethernet function on the ePMP radios can be turned off, and then you’ll really know if your cable holds a stable gig as opposed to the 100meg. Turn that off and you may not sync at all, which is kind what you want to see. With smart ethernet function I was able to keep some AP’s up while I was getting ready to schedule the repair.
- Test the cable between every leg and between legs. For instance, if you have a surge suppressors, test the cable end to end before the surge suppressor, then through the surge suppressor. Bypass the surge suppressor.
- Disable LLDP as sometimes that will conflict with the smart ethernet function. If the cable is good you shouldn’t have this issue, but if its bad that can sometimes cause a 100meg sync, and pd negotiation.
- Remember that 3000L is 24v and the 2000 is 48v which means you’re already looking at using a different power and therefore different equipment or configuration to power one or the other. Changing the 3000L for a 2000 is not an exact comparision. If you’re stepping down to 24v from active poe, that device needs to be gigabit, and loss in amperage can occur, which can affect how the device operates under load. A cable with a thin copper core can cause the drop in amperage too, which means that a 3000 under load might freak out when it goes past 15w draw. Don’t take it for granted that your cables are all the same.
- Use Cat6 shielded RJ45 crimps, even on Cat5e if you’re getting gig sync issues. Some cheap batches or RJ45 crimps are junk with very thin gold coating. If you get a shielded crimps you’re more likely to get an overall better part, but don’t take that for granted either.
I have F300, 3000L and 3000 over 60m all syncing in at a gig. At one point I was getting the same sync issue but the above methodollogy reloved these issues. I have one set of cables at another site lower than that and really battled to get gig sync without perfect Cat6 crimp on both ends.