If we were willing to crack open the X3000 and do some rewiring would it be possible to connect a GPS 1PPS line from the RM520N to an available GPIO input on the MT7981A ?
Could this be added as an integrated feature on future models?
This would let the router act as a PTP grandmaster.
Hi,
Thank you for your suggestion.
We do not officially support GNSS-related features at the moment, but we will collect this kind of feedback and discuss it with the product team.
Regarding your question, we do not recommend opening the device, as doing so would void the warranty.
In addition, without the proper experience, attempting to solder wires between the CPU and the cellular module could potentially damage the hardware.
We also briefly checked the RM520N hardware specifications and could not find a PPS interface/Pin listed — or is this referring to something else?
We are a system integrator and are comfortable with the risks.
Apparently the RM520N does not have an 1PPS output pin.
I had run across some, incorrect, information that it did.
We have gpsd running and it does pull GPS information from the RM520N.
For future products if you get a modem that has a 1PPS and run that it an interrupt-driven GPIO input then your device could function as a PTP grandmaster.
A full PTP solution cost $1000’s so it would add value to the product for this albeit niche area.
If nothing else it would help make up for the lack of a real-time clock and lets the device get a very precise time - more precise than NTP over the Internet - and that can feed the time to the NTP server running on the router thus to the connected network.
Thank you for your suggestion.
We will discuss this with the product team.