The U8S managed-USB OEM module can be used to create systems with large numbers of downstream USB ports far in excess of the 8 ports already provided.
Connecting multiple U8S OEM modules together is slightly more difficult than performing the same task with U16S OEM modules. This is due to the U8S having a separate ‘control port’ for monitoring and control of the 8 downstream USB ports. What this means is that there are 2 USB cables between each U8S OEM module rather than 1.
The PDF below outlines how to connect multiple U8S OEM modules together in a ‘daisy-chain’.