3) Scrambling Control Groups (SCG)
This table lists all scramblers used in the device. Services 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
services. Services are connected to SCGs at page Phase2 (explained more detail below in chapter
#7).
- Name:
Only used in web interface to easily identify the scrambling groups. Therefore groups
should have descriptive names to enable easy identification at Phase2 when connecting services to
SCGs.
- Algorithm:
Scrambling algorithm. Option values:
# disabled
: scrambling for this SCG is actually disabled
# DVB-CSA-1 : CSA with reduced entropy (48 bit keys) – the most typically used.
# DVB-CSA-2 : CSA with full length keys (64 bit keys)
- Scrambling Policy
: Option values:
# All ECMGs
: Services connected to this SCG are scrambled only if all ECMGs are
connected ok
# Any ECMG
: Services connected to this SCG are scrambled as long as at least one
ECMG is connected
# Always
: Services 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 services 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.
- (Min) Crypto Period:
Period in seconds for one control word (encryption key). Also ECM generator
can specify a minimum period it supports and in this case maximum of these two values is used.
- Status:
Scrambling status as traffic lights to provide a quick visual feedback.
