Hello Mikes,
I’m probably one of the guys that Andrew mentioned by “several customers”! I’ve just seen your question, so sorry for the delay in my reply!
Briefly said, we currently have a platform involving 2 BB60Cs and a simple (FTDI serial port basically!) device that we operate through a 10m USB3 active cable and a 4-port USB3 hub and we saw no major issues. But in order to get to the current structure, that can be connected to several PCs and shows no significant performance differences, we ended up with a box of useless USB3 hubs!
With two BB60Cs there is a rather small performance regression with latest APIs. At some point in the past it was terrible but Andrew sorted it out! And for 7 BB60Cs you need to consider a pretty powerful CPU.
I will do some tests with even more BB60Cs connected at once to the same PC as I am involved in a project where I need 14 units. Clearly I won’t go that far, as the project doesn’t require them in just one place, but I will certainly do some tests with as many as possible connected to the same PC.
Just as a warning, depending on the motherboard chipset and/or USB hub, you might see periodic errors while streaming, with the end result of missing samples. With similar structures I testes on several platforms and so far I could not find a general rule. But, on the platform where I see it happening, it tends to happen also when only a single BB60C is connected directly to the PC.
Anyway, our “nightmare” is that we need those two BB60Cs to be in sync!
Regards,
Catalin