Newtec Proprietary
Confidentiality: Unrestricted
R3.2_v1.0
203/387
Feature Descriptions
MDM9000 Satellite Modem
16.7 FlexACM®
In a satellite link operated with Newtec's FlexACM® technology, the modulator and demodulator
parts must exchange signaling information with each other in order to control dynamically the
modulation parameters in function of the instantaneous receive conditions in the demodulator. This
signaling consists of short messages in IP format. The average bit rate of this communication is very
low (only a few hundred bits per second).
The ACM forward signaling is transmitted over the satellite link (RF). The return signaling can be
transmitted over any communication channel between the modulator and demodulator, being a
satellite link or a terrestrial link.
Since there is by definition always a satellite link between the modulator and demodulator, the
communication from the modulator to the demodulator is in most cases transmitted in the satellite
signal itself. It is possible to send this signaling message in the same stream as the IP payload, or to
isolate it from the payload in another DVB-S2 or S2 Extensions stream (multi stream configuration).
For the FlexACM communication between the demodulator and the modulator, the implementation
depends on the topology of the network. For two-way DVB-S2 transmissions, the FlexACM
signaling can be transmitted in the DVB-S2 or S2 Extension return link, mixed with the IP payload or
in a separate DVB-S2 or S2-Extension stream. The FlexACM signaling can also be transmitted in
any other type of satellite return channel (for example VSAT) or terrestrial link (ADSL, GPRS,
etc…).
Enable ACM in the Encapsulator. Refer to the following sections:
• BBFEncapsulationChannelsonpage239
• TSEncapsulationPIDsonpage249
To Next Page
Loading...
