Brocade Communications Systems DCX Backbone Hardware Installation Manual page 124

Removal and replacement of the inter-chassis link (ICL) cables
FIGURE 48 3-way ICL cable connections
1. Chassis 1
2. Core switch blades
3. Chassis 2
4. Chassis 3
5. ICL connector (ICL 1)
6. ICL connector (ICL 0)
For Fabric OS 6.4.0 and later, you can use three DCX chassis is an ICL configuration if the third chassis is in an immediately
adjacent rack.
NOTE
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Brocade DCX Backbone Hardware Installation Guide
53-1000685-24