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A. Simulcrypt Intro
1. Definitions
DVB Simulcrypt defines a system architecture that allows different Conditional Access Systems (CAS) to cooperate with head-end
equipment from different vendors.
A Simulcrypt system provides CAS specific management and control, for use with a generic service scrambling mechanism in the head-ends
The basic Simulcrypt system consists of a single CAS server connected to a single head-end, e.g. a TDX single-unit or multi-unit system.
Multiple head-ends may be connected to the same CAS server(s), distinguished by the IP addresses of the head-ends.
This makes no difference to the scenario seen from the head-end.
2. Architecture
The Simulcrypt architecture splits the CA functionality in two major parts:
•
CAS server part handles the CAS specific management and control flow to distribute access rights to entitled receivers. These
parts are private to each CAS vendor and comprise heavy encryption of keys and control words to be distributed in public
messages but decoded by entitled receivers only. CAS servers communicate with head-ends via the Simulcrypt protocol over
TCP/IP connections. The message format is standardized, but much of the message content is private to the CA system
•
Head-end part performs the actual scrambling of service content and inserts the CA message flows into transport streams in a
standardized way.
3. Simulcrypt in the TDX
From a high level user perspective, the Simulcrypt feature comes with Digital Backend modules (QAM, COFDM and/or IP OUT) and is made
available via the licensing system. It is managed via the Service tool and connects to CAS servers over TCP/IP through the management port.
To enable Simulcrypt scrambling, the user must:
•
Install one or more output modules with Simulcrypt option
•
Install proper license for Simulcrypt in the TDX
•
Configure CAS ID and address information per TDX system
•
Connect and configure a CAS server
To enable a Simulcrypt scrambled service, the user must:
•
Select a scrambler, ie. a Simulcrypt enabled backend module
•
Configure CAS parameters for scrambling the service
•
Map the scrambled service to outputs via the TDX pool
The CAS server and scrambler related configuration is similar to the
existing configuration of CI scrambler modules.
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User manual
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