Is the cnpulse compatable with the N500 900 radio? If so is this the best way to sync multiple AP on the same tower?
Yes, you can use cnPulse to sync two cnReach AP’s. Pinouts are in the user guide.
If you have just two radios to sync and they are fairly isolated you can just set one radio to generate the sync signal and wire it to a second AP to sync both radios.
Using cnPulse and a GPS 1PPS signal syncs an entire field area network in the case of multiple towers that can ‘hear’ each other.