Category:ATSC USB Devices: Difference between revisions

lsusb -t

Wrong

With this setup you will have bandwidth problems with no appropriate warning whatsoever on any log file. Except that video will look horrible.

/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ohci_hcd/8p, 12M     <-- USB1.1,  slow, don't us
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci_hcd/8p, 480M    <-- one bus
    |__ Port 2: Dev 2, If 0, Class=vend., Driver=dvb_usb_ttusb2, 480M <--  1st DVB device, shares bandwidth
    |__ Port 4: Dev 2, If 0, Class=vend., Driver=dvb_usb_ttusb2, 480M <--  2nd DVB device, shares bandwidth

OK

You can solve the above situation by adding a PCI-Express to USB3.0 card:

/:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 5000M
/:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 480M    <-- one bus
    |__ Port 2: Dev 2, If 0, Class=vend., Driver=dvb_usb_ttusb2, 480M <--  one DVB device
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ohci_hcd/8p, 12M     <-- USB1.1,  slow, don't use
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci_hcd/8p, 480M    <-- one bus
    |__ Port 4: Dev 2, If 0, Class=vend., Driver=dvb_usb_ttusb2, 480M <--  one DVB device

Rule: One device per bus