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Features Descriptions M6100 Broadcast Satellite Modulator
12.11.3 Deleting Keys
The command Clear Keys is implemented to reset the Injected Id and the Encrypted session words.
The command writes the value 0 into these parameters.
For security reasons it is advised to enter new scrambling keys as soon as possible!
12.11.4 Seamless Key (Session Word) Change
The BISS key management system is designed to allow the change of a session word (odd/even)
during a transmission without interrupting the stream. The scrambler adds information into the
header to indicate whether the odd or even parity session word is used.
The demodulators/receivers can detect which key (odd or even key) is currently in use. When the
modulator switches from one key to another, the demodulator/receiver automatically detects the
change and switches to the other key in a synchronous way. This way, the demodulator always uses
the proper session word to descramble the transport streams. No interruption or glitch appears at
the output of the demodulator/receiver.
By changing the unused session word on the modulator, it is possible to switch again the key in the
network.
12.11.5 Scrambling Monitoring Parameters
Here you get an overview of the current scrambling state and when the session word was last
changed:
• Scrambling State: Continuously reads out whether the TS is scrambled or not. It is possible that
scrambling is enabled but that due to PAT, PMT alarms and/or when a CA descriptor already
exist, the scrambling is not allowed (in this case the parameter scrambling suppression is
enabled). For more information on scrambling suppression refer to StandardMode.onpage192
• Session word Changed: This parameter informs when the session word was changed for the
last time. Each time a new session word is entered, the timestamp is written to this parameter. It
helps the user to identify the user if the session word stored in the configuration is the right one
or not.
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