Scalability
When connecting multiple hubs together, you can scale the number of downstream ports available. Using the expansion port(s), multiple hubs can be daisy-chained to provide additional ports.
The maximum number of PowerPad15S hubs that can be connected to a single host is dependent on the USB specification limits for hub depth, endpoints, and memory. Please refer to the Hub Endpoint Information in the Hub Specifications for specific limits.
Up to 43 hubs can be connected using a single host connection.