SHAPING THE FUTURE OF SATELLITE COMMUNICATIONS
9.1.2.3 When is In-band Return Signalling Used
This is used when the remote side of a FlexACM link does not have additional
switches, routers or VLANs that allow providing feedback towards the ACM
controller. For example:
• Only a modem is present at the ACM client site;
(The satellite link provider only delivers the modem.);
• A connection to the LAN is prohibited
(military environment);
• Only the satellite link is available to provide feedback to the ACM controller;
• The management networks (M&C LANs) on each side of the satellite link are
owned by different companies and cannot be linked;
• Customers that do not allow any additional traffic to be added to their own
traffic;
• Customers/network owners that do not allow any mix of signaling and payload
traffic.
9.1.2.4 Possible Routing Options
The following options are possible:
• In a modulator (EL170 or EL178): to transmit ACM signaling from the on-board
FlexACM controller to a remote FlexACM client;
• In a modem (EL470 or EL478): to transmit ACM signaling from the on-board
FlexACM client to a remote FlexACM controller;
• In a modem (EL470 or EL478): to receive ACM signaling from a remote
FlexACM controller and route it to an on-board FlexACM client;
• In a demodulator (EL970 or EL978): to receive ACM signaling from a remote
FlexACM controller and route it to an on-board FlexACM client.
These routing options can be chosen and configured independently from each
other, and can be combined with out-of-band and/or off-satellite routing options (for
example in-band forward signaling and terrestrial return).
It is also possible to program the equipment to transmit in-band ACM signaling on
separated DVB-S2 streams (separated ISI in multi-stream mode), so there is no
mixing at all between signaling traffic and payload traffic. This needs to be
configured by the user as by default the payload and the signaling are sent in the
same stream.
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