Kajoo wrote

Network is usually stable for 3-5 days, but then some of the Repeaters will lost its configuration and go back to factory default causing some cameras to stop showing images.

Sounds like a hardware fault. How much are "some of the repeaters"? All three? One? Two?

Did you ground the CPEs properly? What's the cable length from PoE adapter to the CPE? How long did the CPEs run w/o problems? Is the main power stable?

The system doesn't have connectivit y to the internet, so packages are only sent to local IP addresses. Packages are formed with 4KBytes in a single UDP message (4 per second).

The maximum transmission unit (MTU) for Ethernet frames is 1500 minus frame headers. UDP datagrams exceeding MTU will be fragmented, but if a frame fails, the whole datagram will be dropped. So, UDP datagrams should not exceed the MTU of an Ethernet frame to avoid dropping whole datagrams if transmission of an Ethernet frame fails.

But this has nothing to do with a CPE resetting and restoring factory defaults by itself.

I've been using CPE210 for a while and they are very reliable, but with images it became a real nightmare.

The nightmare could be caused by using three CPEs in repeater mode. I would avoid repeater mode on directional links and rather use client mode to connect to the AP.

Kajoo wrote

I didn't ground the cpe and the power is not stable at all.

Grounding is an essential requirement for outdoor APs to avoid potential damages to its components, no matter what brands of devices you use.

An unstable power supply could lead to a reboot, but I never had a factory reset of a CPE b/c of power outages - except when settings were not saved, but I assume you saved settings after applying, didn't you?

I've selected CPE because it is whether proof.

Yes, it is weather-proof if properly grounded (see the installation guide, page 7).

What other router would you suggest to use for outdoor coverage?

I use CPE/WBS only, so have no practical experience with other brands. But i know from another company specialized in CCTV installations, that they moved from UBNT gear to TP-Link gear b/c of the long-term stability of the CPEs. Therefore I'm somewhat surprised to learn about CPEs restoring factory defaults, but could imagine that lightning probably did damage critical components due to no grounding.

lobodil wrote

Others brands take ground throught power cord, and it`s enough.

That's possible with CPEs, too. Just RTFM, it's even included in printed form with every CPE:







This cable would fit perfectly:

Kajoo wrote

Let me try to understand the feedback around proper ground. My router is installed outside a house in the wall to provide better outdoor coverage for multiple devices. If I don't ground it, then cpe will be subject to always reset itself to factory default.

Improper grounding will expose the electronic to atmospheric ESD during storms and lightning which indeed can lead to such a malfunction. If (in a certain sense) you are "lucky", then it will brick the CPE completely and you notice it, if you're not noticing it that it was damaged by a lightning storm, it can behave in all possible weird ways and you won't be able to discover the exact cause of possible malfunctions. ESD needs not necessarily lead to destruction of the flash chip directly, but to other components which could prevent to properly read or write the flash chip's content.

I would love to understand why a portion of the flash memory would corrupt and what triggers this.Reset button on the power adapter will put 24V in the pin 3. Would it mean that some kind of capacitance is adding voltage to pin 3 for enough time until the hardware takes the decision to reset?

No, on pin 1 (Transmit +). An unstable power supply/changing voltage levels could probably trigger a RESET depending on the circuit design and various other points such as changing GND reference level etc. Using a standard 24V PoE adapter with + on pins 4,5 and - on pins 7,8 can probably help to avoid that.

Great that it works. But keep in mind that exceeding EIRP regulatory limits for your country is illegal and may result in a penalty being imposed on you.