Hello Jesse,
1: To use the cnPulse for sync source for ePMP, please configure GPS sync in CMM5 mode. It will pull the sync using the ethernet.
Configuration >>> Radio >>> Synchronization Source
2: For TDD sync between the PMP 450 and ePMP, please use the co-location calculator tool available at: https://support.cambiumnetworks.com/file/6d27290a842cd6ad1160927174ede302a0851be2
Note: Use the same timing inputs and radio config. The tool’s output will indicate “OK” if it’s good to go.
Please share if you have any further queries or inputs.