Synchronization source– Synchronization mode supports two types of timing sources: the timing signal provided by a Cambium Network’s Cluster Management Module (CMM) or by the AP’s own on-board GPS receiver. Both these sources require GPS Synchronization capable AP hardware and will allow APs to receive a stable timing signal to synchronize their own Tx/Rx cycles.
There is a third option for the Synchronization source, namely “internal”. This “Internal” Synchronization source option is NOT an actual synchronized timing source and when selected, it just provides timing from an internal unsynchronized source. “Internal” is NOT to be used in GPS Synchronized deployments but could be used with single PMP AP installations. The “Internal” timing source is also used when the Flexible DL/UL ratio option is selected.