Jupiter Fusion Catalyst 4000 - Figure 2. Default Display Numbering, 3 X 3 Array; Figure 3. Typical Fusion Catalyst 4000 Rear Chassis

3—Hardware Setup
10 Fusion Catalyst 4000 Getting Started Guide
4. Connect the display cables to the proper graphics output
connectors on the rear of the system. Display devices in a wall
are numbered top left to bottom right counting across to the
right and moving down.
Figure 2 - Default Display Numbering, 3 x 3 Array
Figure 3 - Typical Fusion Catalyst 4000 Rear Chassis