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When several RAVENNA devices are present on the same network, one is elected as PTP Master, and the other ones as PTP Slave.
Only the PTP Master is able to lock to an external reference (i.e. Wordclock, Video reference,...)
If the PTP Master device fails, one of the Slave device will be elected to Master, but by default will be on its internal clock.
The PTP priorities has to be configured on the devices, to have it set on the external clock in the case it becomes Master.

Setup example :

- Horus 1 master with sync on Video Ref.
- Horus 2 slave, needs to fallback as master with sync on Video Ref.

1. On each Horus, select Video in the I/O & Sync Page.
   On the PTP Master, the Horus will be synchronized on Video, the PTP slave will show Video sync red :
   
   
   
   
2. Open the advanced pages of the slave device, and go in the PTP tab.
   
   
3. Tick the "Manual" box and set "Priority 1" to 130 (Default value 127).
   The other PTP Parameters should not be modified.
   
   
   If the Master PTP device fails, the Slave device will turn to Master.
   This change does require several seconds, and during that time, the audio might be degraded.
   
   
   When the previous PTP Master comes back, it will turn to Master, which may also require several seconds.