What is ACM (Adaptable Codification Modulation)

ACM (Adaptable Codification Modulation)
VSATs send signal strength information to the central station. Ideally, this information should be overlaid on the main data stream in a standard return channel such as DVB-RCS. During rain fading conditions, the ModCod used in frames sent to a specific VSAT or group of VSATs is dynamically boosted to avoid signal interruptions. In clear weather, ModCod

ACM (Adaptable Codification Modulation)

ACM (Adaptable Codification Modulation) is a technology that can automatically compensate for the modulation. Adaptable Codification Modulation (ACM) provides a frame-by-frame adaptation of coding and modulation according to the current propagation conditions. Correct the FEC of a link and adjust the changes of this link automatically, without the need for a DONGLE. When the signal type of the satellite changes device already makes the automatic correction. Without connecting to any other device to it for the correction to be made.

Implementation of ACM in SkyEdge II

When operating in ACM mode, the forward data stream contains DVB-S2 frames with different ModCod. Each frame may contain data destined for one or more VSATs with a common ModCod.

The Network Management System (NMS) communicates network management information to the IP encapsulator. By default, data from the NMS is transmitted with the most stable ModCod used on the network.

in addition, ACM assumes the use of a variable actual data rate, which depends on the spectral efficiency of the ModCod used. The DPS provides the external QoS server with information about the actual data rate so that the QoS server can make the correct packet allocation decisions. For the exchange between the DPS and the Allot QoS server, a protocol especially developed for this is used.

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