Newtec M6100 - Page 203

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Features Descriptions M6100 Broadcast Satellite Modulator
Parameter Description
Odd/Even Session
word
This setting allows the user to set the odd or even clear session word.
The entered clear session word is used by the scrambler as the real
encryption key. The key parity defines if the odd or even key will be
used by the scrambler.
Interface used
The clear session words are entered by the user through any interface
(For example: Frontpanel, GUI, CLI, SNMP).
It is not possible to read back the session words by any interface.
Hexadecimal
A session word exists out of 12 digits and is in hexadecimal format.
When entering the session word, enter the most significant digit
(nibble) first (reading from left to right).
For example, 0xA13DBC42908F would be entered in the following
sequence:
A,1,3,D,B,C,4,2,9,0,8,F
The clear session word must be distributed to all parties that are
allowed to descramble the received data.
Key Parity Key Parity Selection on the Modulator
The user on the transmitting site selects whether to use the odd or the
even session word.
Note: When the Key Parity is set to odd, setting the even session word
has no direct impact on the scrambled output and the other way
around. The “new” session word becomes active when the key parity is
switched on the scrambler.
Setting Clear Session Words
Starting Point: The odd session word is used by the scrambler. This is indicated in the
header of the transport stream packet.
• Entering an even session word does not affect the scrambled output.
• The even session word is stored in the device
• Switch Key Parity (to Even)
• The output is now scrambled with the even session word. The header of the transport stream
packet indicates that the even session word is used. The descrambler of the receiver reads out
the header information and decrypts with the correct key..
Entering new session words is limited by the BISS specification to 10 times within a 5
minute period and there must be a minimum of 10 seconds between two changes.
It is also possible to edit the active session word directly (the odd session word in the example here).
It will then be directly used in the scrambling. The new session word has to be entered also on the
descrambler side to allow proper descrambling. As a consequence, editing the active session word