I did get one for the isp1122a (that is actually how I found it) and it has the same shape and the same number of pins and it does seem to connect to the two usb ports with DM1 DP1 DM2 DP2 with DP0 DM0 being upstream so I should guess that DM3, DP3 are connected to the brightness, but what I am not sure of is can you plug downstream port 1 D− connection (analog) staight to a hubs data - port and ect. with the rest of the connections. The ports on the back all seem to have about 22ohms of resistants to the chip so I do not know if that is important.