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5.11.2. Scrambling Control Groups (SCG)
This table lists all Scrambling Control Groups used in the device. Programs connected to the same SCG are
scrambled at the same time with the same control word (encryption key). Each SCG can contain one or more
program. Programs are connected to SCGs at page Phase2 (see 5.11.7 on page 58).
Name
: Only used in GUI to easily identify the scrambling groups. Therefore groups should have descriptive
names to enable easy identification at Phase2 when connecting programs to SCGs.
•
Algorithm
(Scrambling algorithm) option values:
# unscrambled (scrambling for this SCG is actually disabled)
#
DVB-CSA-1
#
DVB-CSA-2
#
DVB-CISSA
#
ATIS-IDSA
#
AES-ECB
#
AES-CBC
•
Scrambling Policy
option values:
# All ECMGs
: Programs connected to this SCG are scrambled only if all ECMGs are
connected
# Any ECMG
: Programs connected to this SCG are scrambled as long as at least one
ECMG
is
connected
# Always
: Programs are scrambled always. If all ECMG connections are lost, no one
is
able
to
descramble.
•
Fallback
: (Fallback rule) in case Scrambling Policy (defined above) is not fulfilled. Option values:
# Revert to clear : Stop scrambling. Subscribers will receive programs as unscrambled. Also
non-subscribers
are
able
to
view
the
content.
# Keep last CW : Scrambling is continued using the last CW and the last received ECM.
Subscribers
are
able
to
continue
the
descrambling.
•
Crypto Period (sec)
Min. period in seconds for one control word (encryption key). Also ECM generator
can specify a minimum period it supports and in this case larger of these two values is used.
•
Status
(scrambling status) shown as traffic lights, to provide a quick visual feedback.
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