When connecting HA3969 or HA3969U Master Chassis to expansion JBOD chassis, please follow this connection guidline.
1. On master chassis, any “IN” port is meant to connect to an external slave device, which is the JBOD.
2. On the expansion JBOD Chassis (slave device), “OUT” port is meant to connect to its master. “IN” port is again meant to connect to another slave device which in this case could be another daisy chained slave device.
Full diagram of a maximum cabled configuration is found on page 42 of the HA3969U hardware manual downloadable here. The left shows connections for master chassis with dual sas expansion ports, the right shows connections for master chassis with quad sas expansion ports.