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DVB Common-Interface (DVB-CI)

Please note that this page is incomplete. More infos will be added as time permits. For now, please refer to

DVB-CI defines an interface between a DVB receiver (TV set, Bluray recorder etc.) and a PC-Card module (Conditional Access Module, CAM). It consists of a transport stream interface and a command interface.

On the transport stream interface, a DVB Transport Stream can be routed through the module and optionally be descrambled. The command interface transfers commands like start descrambling.


DVB-CI was defined by DVB in 1997

Example traffic


The DVB-CI dissector was written by Martin Kaiser ( It is in pre-alpha state. It supports DVB-CI as defined in the DVB-CI specification (EN50221). Fragmentation on link and transport layers is not implemented yet. On the application layer, rm, ap and parts of the ca resource are implemented.

The dissector uses pcap files with datalink type 235. The corresponding format is documented on

Preference Settings

There are no preference settings for DVB-CI itself.

However, DVB-CI uses length fields in ASN.1 BER format in many messages. To dissect these length fields, the DVB-CI dissector uses the existing BER code. To display details of each length field, select Show internal BER encapsulation tokens from the Edit / Preferences / Protocols / BER preferences.

Example capture file

Display Filter

Capture Filter