The slow-path Graphics Update PDU is used to transmit graphics updates from server to client.
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tpktHeader
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x224Data
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mcsSDin (variable)
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securityHeader (variable)
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slowPathGraphicsUpdates (variable)
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tpktHeader (4 bytes): A TPKT Header, as specified in [T123] section 8.
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x224Data (3 bytes): An X.224 Class 0 Data TPDU, as specified in [X224] section 13.7.
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mcsSDin (variable): Variable-length PER-encoded MCS Domain PDU which encapsulates an MCS Send Data Indication structure, as specified in [T125] (the ASN.1 structure definitions are given in [T125] section 7, parts 7 and 10). The userData field of the MCS Send Data Indication contains a Security Header and the Slow Path Graphics Update (section 2.2.9.1.1.3.1).
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securityHeader (variable): Optional security header. If the Encryption Level (sections 5.3.2 and 2.2.1.4.3) selected by the server is greater than ENCRYPTION_LEVEL_NONE (0) and the Encryption Method (sections 5.3.2 and 2.2.1.4.3) selected by the server is greater than ENCRYPTION_METHOD_NONE (0) then this field will contain one of the following headers:
If the Encryption Level (sections 5.3.2 and 2.2.1.4.3) selected by the server is ENCRYPTION_LEVEL_NONE (0) and the Encryption Method (sections 5.3.2 and 2.2.1.4.3) selected by the server is ENCRYPTION_METHOD_NONE (0), then this header is not included in the PDU.
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slowPathGraphicsUpdates (variable): A variable-length array of slow-path graphics updates (see 2.2.9.1.1.3.1) to be processed by the client.