| 摘要 |
The invention provides a Common Interface, Cl, host (10) comprising a Universal Serial Bus, USB, controller (30) for connecting to a USB device (31) of a Common Interface Conditional Access Module, CICAM, (20) the USB controller being configured to use
- a first logical pipe (33) for transferring control information between the CICAM and the Cl host; and
- a second logical pipe (35) for transmitting to the CICAM a first CA encrypted signal.
- a third logical pipe (37) for receiving a first CA decrypted signal, corresponding to the first CA encrypted signal, from the CICAM,
wherein USB isochronous pipes are used as the second logical pipe (35) and the third logical pipe (37) when the first CA encrypted signal originates from a DVB broadcast and USB bulk pipes are used as the second logical pipe (35) and the third logical pipe (37) when the first CA encrypted signal originates from an Internet source. |
