The hardware universe is missing a note I found in other documentation:
FAS2240 Supported configurations
The FAS2240 is supported for FC only in single-node configurations using the X1150A-R6 FC adapter. FAS2240 single-node FC configurations cannot be joined to other nodes in a cluster. To join the single node to a cluster, you must remove the FC adapter and replace it with the 10-Gb Ethernet adapter required for the cluster interconnect. iSCSI is supported for both single-node and multi-node clusters.
So you can't use the DS14 series FC shelves with cDOT, as you have to have at least (1) 10Gbps port per node for cDOT.