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Features Descriptions M6100 Broadcast Satellite Modulator
12.11.1.2 Raw Mode
In this mode the payload of all packets is scrambled except for the PID<0x1F. In this mode it is
possible to overwrite the default 0x1F value in order to define the range of unscrambled PIDs (from
0x00 to a user-given value). Use the following parameters to define this range, Min RAW
Unscrambled PID and Max Raw Unscrambled PID.
The scrambling starts immediately as this mode does not perform a check if a valid PAT is available
in the TS.
Furthermore, this mode scrambles all PMTs (if any) and it does not insert a CAT in the transport
stream.
This encryption mode guarantees SFN (Single Frequency Networks) integrity.
It can also be used to encrypt proprietary MPEG streams.
12.11.2 Key Management System
12.11.2.1 Odd/Even key
The BISS specification is based on the use of two scrambling keys: the odd key and the even key.
One key is the active one, use to scramble the packets, while the other key is the future key to use.
This allows to enter in devices the next key to use in advance and later activate at the chosen
moment.
On the scrambling side (the modulator), the operator defines which key shall be used. On the
descrambling side, the devices automatically detect which key to use.
Note that only the Even key should be used for BISS for interoperability with 3rd party
receivers.
12.11.2.2 Key Management System Structure
The following figure details the structure of the BISS Key management system that is implemented.
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