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Appendix - Generic Stream Encapsulation MDM6000 Satellite Modem
18 Appendix - Generic Stream Encapsulation
Generic Stream Encapsulation (GSE) is used in applications where bandwidth efficiency is
important, such as IP backbone or IP trunking applications over satellite.
GSE carries "native" IP content with a significant reduction in overhead compared to other
Encapsulation protocols such as MPE.
IP datagram's, Ethernet Frames, or other network layer packets, which are scheduled for
transmission, are encapsulated in one or more GSE Packets (we refer to the following figure.). The
encapsulation process delineates the start and end of each network-layer PDU (Protocol Data Unit).
It adds control information such as the network protocol type and address label, and provides an
overall integrity check when needed.
GSE guarantees that no fragmentation at the IP layer occurs. Fragmentation (if any) needed to
adapt to the DVB broadcast bearer's baseband frames is performed entirely within the GSE layer
and thus hidden from the IP layer. The reassembly process is robust against loss of baseband
frames.
The characteristics of this encapsulation mode are:
• Only supported with DVB-S2, DVB-S2X or S2 Extensions modulation;
• Possible multi-stream operation (up to 32 streams, each tagged with a separate ISI);
• Full support of VCM and FlexACM.
Refer to the DVB standard: ETSI TS 102 606 for detailed information on the Generic
Stream Encapsulation Protocol.
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