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Appendix - Generic Stream Encapsulation MDM6000 Satellite Modem
18.1 GSE Header
The GSE packet header is dynamic and provides different options. The minimum length of a header
is two bytes, comprising three flag fields, and a 12-bit payload length field.
The table below shows all possible fields.
Bit Offset 0 1 2-3 4-7 8-15 16-23 24-37
0 Start End Label Type GSE Length Fragment ID Total
Length
32 Total Length Protocol Type Label
(3
Byte)
64 Label (3 Byte) Label (6 Byte)
96 Label (6 Byte) ULE Extension Headers (Optional)
… ULE Extension Headers (Optional) Data
… Data
GSE Label Type
The "Label Type" bits of the GSE header carries the values of the Label Bit Field. A receiver must
interpret the label bits to see whether the PDU carries a label used for filtering purposes. When the
label is present and it does not match with the label known in the receiver, the GSE packet is
discarded.
The following possibilities are available in the GSE Encapsulator
GSE Label Type Description
No Label Broadcast mode, all receivers must process the incoming GSE
packets.
Three Bytes The receiver must perform filtering on the incoming GSE packets.
The GSE labels between the Tx site and Rx site, must match
otherwise the GSE packets are discarded.
Six Bytes Length The receiver must perform filtering on the incoming GSE packets.
The GSE labels between the Tx site and Rx site must match
otherwise the GSE packets are discarded.
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