Advantech L-Band Satellite Modulator, Installation And Operation Manual

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Web GUI Monitoring & Control
4.8.5
BISS-E
The transport stream is encrypted by a calculated session word. This session word is generated
from an injected ID and an Encrypted session word. This is fundamentally more secure as both
the Injected ID and Encrypted session words are required for decryption and each receiver
could have a unique Encrypted session word. The Injected ID is a 14 digit Hex value and the
Encrypted Session Word (ESW) is a 16 digit hex value. If the key or the ID is not present then the
last entered values will be used.
4.8.6
Odd/Even-1
This mode is not part of the BISS standard but has been successfully interoperated with other
manufacturers who have similar variants. Each MPEG packet has a field in the header which
indicates if it is in the clear, encrypted using an ODD key or encrypted using an even key. While
BISS only uses the one key, this mode allows two independent keys. The advantage of this mode
is that it allows keys to be programmed offline while using the other key for decryption. Both the
odd and the even session word will require a 12 digit hex value. The even key is the same key as
that used for BISS-1.
4.8.7
Odd/Even-E
Odd/Even-E also uses the odd and even keys in the same way as Odd/Even-1 mode but each
key is encrypted using the same Injected Id. The Injected Id will require a 14 digit hex value and
the ESWs will both require 16 digit hex values. The even key is the same key as used for BISS-E.
Figure 4.22: Odd/Even-E Selected
4.8.8
User-1
This enables a specific user mode where specific PIDs are decrypted. The SI information is not
altered so this mode is not BISS compliant. The actual PIDs to be decrypted are specified only on
the command line. A 12 digit hex value is required for the session word. The even key is the same
key as used for BISS-1.
This mode is used to guarantee that the decrypted transport stream will match the original.
SBM75e Series Modulator Installation and Operation Manual
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