Information About DVB VOD
Overview of DVB VOD
This feature enables the operator to scramble the video sessions on the chassis. It involves the configuration to establish a connection with the Entitlement Control Message Generator (ECMG) and the Event Information Scheduler (EIS).
The two primary modes of scrambling are: session based scrambling and tier-based scrambling. The basic difference between the two modes is that the manner in which the Entitlement Control Messages (ECM) are requested from the ECMG. For session based scrambling, a control word (CW) is generated once every Crypto Period (CP) and the ECM is requested for each session. For tier-based scrambling, the control word is generated once every CP and the ECM generated by the ECMG for the CW is used by all the sessions in the chassis.
Session based Scrambling Setup
The connection with the external EIS Server is established via the Virtual Port Group in the Supervisor. The connection with the external ECMG server is established via the linecard.
The fail-to-clear-duration feature is supported on DVB sessions and DualCrypt encryption modes. Based on the session encryption, the following two features are supported on the Cisco cBR Series Converged Broadband Routers.
Fail-to-Clear Duration for DVB Session-based Encryption
This feature is used along with DVB or DualCrypt encryption with external Event Information Scheduler (EIS) configuration.
When encryption for a session fails in Cisco cBR-8, this feature enables the operator to control the configured DVB-encrypted sessions to function without encryption for a
configured duration. If the encryption still fails, the DVB session is marked as
Fail-to-black after the fail-to-clear duration timeout.
Fail-to-Clear for DVB Tier-based Encryption
This feature is used along with Tier-based configuration. When encryption for a session fails in Cisco cBR-8, this feature enables the operator to control the configured DVB-encrypted sessions to function without encryption.
If fail-to-clear is configured, tier-based configuration is enabled, and then if the encryption fails, the DVB session's
Encrypt Status is marked as
clear. The status changes to
Encrypted when the encryption starts.
This feature is not enabled by default.
Tier based Scrambling Setup
The connection with the external ECMG server is established via the Virtual Port Group in the Supervisor.
Restrictions for DVB
This feature is applicable only for remapped table based sessions.
Fail-to-clear-duration feature is applicable only to session-based scrambling for DVB CAS encryption.
Fail-to-clear feature is applicable only to DVB tier-based scrambling sessions.