We have 3 GHz 450i APs with no NTP server configured that somehow know the date and time. Do they get it via Cambium Sync? From the router?
Other seemingly identical APs at different sites have started giving us red error messages about the time not matching the CBRS proxy. If we configure an NTP server (and reboot the AP) the error goes away.
But how were they previously getting the time? And why do APs at other sites with seemingly identical setups get the time?
Hi Ken, are you by chance using cnMaestro or cnPulse with these devices? Our radios can learn time from NTP, GPS (either onboard for some models or external GPS device like cnPulse), cnMaestro, or manually setting time on the configuration page.
Once the device knows time, we will attempt to maintain it and store it across reboots, which should keep it at least relatively close to reality until it can get properly updated while running from the other methods above.
Also, to note, the SM’s will learn time from the AP at registration.
If you would like, you can send me an engineering capture from two devices, one with time and wone without, via DM and I’ll take a look.
Thanks Aaron. Since they are CBRS APs, they all use cnMaestro. AFAIK 450i does not have internal GPS. These are getting Cambium Sync from a Packetflux Powerinjector + Sync (like a small version of Rackinjector).
Could this be some kind of race condition if there’s a power outage, like the AP powers up and tries to contact cnMaestro but the licensed link feeding the site isn’t up yet?
Good point on CBRS requiring cnMaestro, I had overlooked that connection.
I’ll have to check internally on this and maybe reach out offline. In meantime, can you capture engineering.cgi captures and send them to me via DM? It could be that the time got lost somehow and it is starting out at default again where the others have been able to keep a good enough time if they have had to reboot.