2.2.8.1.1.1.1 Share Control Header (TS_SHARECONTROLHEADER)

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The TS_SHARECONTROLHEADER header is a T.128 header ([T128] section 8.3) that MUST be present in the following PDUs.

A definitive list of all Data PDUs is given in section 2.2.8.1.1.1.2 in the description of the pduType2 field.


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totalLength

pduType

pduSource

totalLength (2 bytes): A 16-bit unsigned integer. The total length of the packet in bytes (the length includes the size of the Share Control Header). If the totalLength field equals 0x8000, then the Share Control Header and any data that follows MAY be interpreted as a T.128 FlowPDU as described in [T128] section 8.5 (the ASN.1 structure definition is detailed in [T128] section 9.1) and MUST be ignored.

pduType (2 bytes): A 16-bit unsigned integer. It contains the PDU type and protocol version information. The format of the pduType field is described by the following bitmask diagram.


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type

PDUVersion

type (4 bits): A 4-bit unsigned integer that specifies the PDU type.

Value (4 bits)

Meaning

PDUTYPE_DEMANDACTIVEPDU

0x1

Demand Active PDU (section 2.2.1.13.1).

PDUTYPE_CONFIRMACTIVEPDU

0x3

Confirm Active PDU (section 2.2.1.13.2).

PDUTYPE_DEACTIVATEALLPDU

0x6

Deactivate All PDU (section 2.2.3.1).

PDUTYPE_DATAPDU

0x7

Data PDU (actual type is revealed by the pduType2 field in the Share Data Header (section 2.2.8.1.1.1.2) structure).

PDUTYPE_SERVER_REDIR_PKT

0xA

Enhanced Security Server Redirection PDU (section 2.2.13.3.1).

PDUVersion (12 bits): A 12-bit unsigned integer that specifies the PDU version.

pduSource (2 bytes): A 16-bit unsigned integer. The channel ID that is the transmission source of the PDU.