The USB spec calls for a bulk capacitor of no less than 120uF on each downstream port. I have a total of 7 ports on my USB Hub, 6 of them are connectors where you can attach USB devices, however there is one internal device: FTDI's FT232R VCOM IC. This device is always attached and I'm wondering if I still need the bulk capacitance.
Based on what I've read of USB design guidelines the bulk capacitance is there for when you attach a device you don't cause too much droop on other ports.
FT232RL and RS232 Transceiver: