Functional Description
45
ID: um_tsmux
CP525 cMux User’s Manual Rev. 5.20.12 (3944)
Figure 5.14
Generic
overview
of
EPG regeneration using PMCP.
on-the-fly together with the transport stream processed by the CP525, and transmitted on regular
intervals at the output.
5.13 Scrambling
5.13.1 General
The CP525 offers a feature for scrambling of services and individual components. It also en-
ables insertion of EMMs (Entitlement Management Message) and ECMs (Entitlement Control
Message) into the Transport Stream. Both the scrambler and the EMM insertion is implemented
to comply with the ECMG
<
=
>
SCS and EMMG
<
=
>
MUX interfaces as described in the DVB
SimulCrypt specification
Note:
Scrambling is a licensed feature and is only available if the licence
key is installed. Insertion of ECMs and EMMs is licenced by the Conditional
Access feature, while scrambling with BISS1 is licenced by the BISS key.
5.13.2 Simulcrypt setup
The scrambling consists of two parts; creating connections for exchanging CWs (code words)
for ECMs (see section
), and setting up services for scrambling (see section
).
The CP525 has a total of 31 code word pairs (odd/even) available, i.e. 31 SCGs (Scrambling
Control Groups). These can be used freely and are randomly generated from a physical source.
Currently the CP525 is limited to one ECM per scrambling group.
Each SCG has its own crypto period defining the duration of one control word. This crypto
period is defined by the nominal CP duration parameter and can be changed runtime by the
user to extend/shorten the cycle period.
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