9.3.5 P-DATA-TF PDU Structure
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### 9.3.5 P-DATA-TF PDU Structure

A P-DATA-TF PDU shall be made of a sequence of mandatory fixed length fields followed by a variable length field. Table 9-22 shows the sequence of the mandatory fields.

The variable data field shall contain one or more Presentation-Data-Value Items.

Table 9-22. P-DATA-TF PDU Fields

PDU bytes | Field name | Description of field
--- | --- | ---
1 | PDU-type | 04H
2 | Reserved | This reserved field shall be sent with a value 00H but not tested to this value when received.
3-6 | PDU-length | This PDU-length shall be the number of bytes from the first byte of the following field to the last byte of the variable field. It shall be encoded as an unsigned binary number.
7-xxx | Presentation-data-value Item(s) | This variable data field shall contain one or more Presentation-data-value Items(s). For a complete description of the use of this field see Section 9.3.5.1

#### 9.3.5.1 Presentation Data Value Item Structure

The Presentation Data Value Item shall be made of a sequence of mandatory fixed length fields followed by one variable length field. Table 9-23 shows the sequence of the fields.

The variable field shall consist of one Presentation-Data-Value.

Table 9-23. Presentation-Data-Value Item Fields

Item bytes | Field name | Description of field
--- | --- | ---
1-4 | Item-length | This Item-length shall be the number of bytes from the first byte of the following field to the last byte of the Presentation-data-value field. It shall be encoded as an unsigned binary number.
5 | Presentation-context-ID | Presentation-context-ID values shall be odd integers between 1 and 255, encoded as an unsigned binary number. For a complete description of the use of this field see Section 7.1.1.13.
6-xxx | Presentation-data-value | This Presentation-data-value field shall contain DICOM message information (command and/or data set) with a message control header. For a complete description of the use of this field see Annex E.

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