Category:DVB-C 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.

<pre>

/: 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

</pre>

=== OK ===

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

<pre>

/: 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

</pre>

'''''Rule''': One device per bus''