An XDAB master NION will always receive the audio clock from its CobraNet module, regardless of whether that module is a Conductor or a performer.
If the CobraNet clock source is external to the cluster (i.e. the XDAB master is a performer and the Conductor is external to the cluster), it will still work fine.
If the clock source is internal to the cluster (i.e. the CobraNet Conductor is within the VLAN within the cluster), then the XDAB master and the CobraNet Conductor must be the same.
Notes:
In the example above, the clock source is the CobraNet Conductor (clock path 1). This Conductor NION must also be the XDAB master. Clock 1 will be transmitted by XDAB to the other devices in the cluster and also to the other cluster on the network via CobraNet.