pynetdicom.pdu.A_ASSOCIATE_AC

class pynetdicom.pdu.A_ASSOCIATE_AC

An A-ASSOCIATE-AC PDU.

An A-ASSOCIATE-AC PDU is sent by an association acceptor to indicate that association negotiation has been successful.

application_context_name

The ‘Application Context Item’s Application Context Name field value (if available).

Type

pydicom.uid.UID

called_ae_title

The requestor’s Called AE Title field value, which is the destination DICOM application name as a 16-byte value. The value is not guaranteed to be the actual title and shall not be tested.

Type

bytes

calling_ae_title

The requestor’s Calling AE Title field value, which is the source DICOM application name as a 16-byte value. The value is not guaranteed to be the actual title and shall not be tested.

Type

bytes

pdu_length

The number of bytes from the first byte following the PDU Length field to the last byte of the PDU.

Type

int

pdu_type

The PDU Type field value (0x02).

Type

int

presentation_context

The Presentation Context Item(s).

Type

list of pdu_items.PresentationContextItemAC

protocol_version

The Protocol Version field value (default 0x01).

Type

int

user_information

The User Information Item (if available).

Type

pdu_items.UserInformationItem

variable_items

A list containing the A-ASSOCIATE-AC’s ‘Variable Items’. Contains one Application Context item, one or more Presentation Context items and one User Information item. The order of the items is not guaranteed.

Type

list

Notes

An A-ASSOCIATE-AC PDU requires the following parameters:

• PDU type (1, fixed value, 0x02)

• PDU length (1)

• Protocol version (1, default value, 0x01)

• Variable items (1)

  • Application Context Item (1)

    • Item type (1, fixed value, 0x10)

    • Item length (1)

    • Application Context Name (1, fixed in an application)

  • Presentation Context Item(s) (1 or more)

    • Item type (1, fixed value, 0x21)

    • Item length (1)

    • Context ID (1)

    • Result/reason (1)

    • Transfer Syntax Sub-items (1)

      • Item type (1, fixed, 0x40)

      • Item length (1)

      • Transfer syntax name(s) (1)

  • User Information Item (1)

    • Item type (1, fixed, 0x50)

    • Item length (1)

    • User data Sub-items (2 or more)

      • Maximum Length Received Sub-item (1)

      • Implementation Class UID Sub-item (1)

      • Optional User Data Sub-items (0 or more)

Encoding

When encoded, an A-ASSOCIATE-AC PDU has the following structure, taken from Table 9-17 1 (offsets shown with Python indexing). PDUs are always encoded using Big Endian 2.

Offset	Length	Description
0	1	PDU type
1	1	Reserved
2	4	PDU length
6	2	Protocol version
8	2	Reserved
10	16	Reserved^
26	16	Reserved^
42	32	Reserved
74	Variable	Variable items

^ The reserved fields shall be sent with a value identical to the value received in the A-ASSOCIATE-RQ but their values shall not be tested.

References

1

DICOM Standard, Part 8, Section 9.3.3

2

DICOM Standard, Part 8, Section 9.3.1

__init__()

Initialise a new A-ASSOCIATE-AC PDU.

Methods

__init__()	Initialise a new A-ASSOCIATE-AC PDU.
decode(bytestream)	Decode bytestream and use the result to set the field values of the PDU.
encode()	Return the encoded PDU as bytes.
from_primitive(primitive)	Setup the current PDU using an A-ASSOCIATE (accept) primitive.
to_primitive()	Return an A-ASSOCIATE (accept) primitive from the current PDU.

Attributes

application_context_name	Return the Application Context Name, if available.
called_ae_title	Return the value sent in the Called AE Title reserved space.
calling_ae_title	Return the value sent in the Calling AE Title reserved space.
pdu_length	Return the PDU Length field value as an int.
pdu_type	Return the PDU Type field value an int.
presentation_context	Return a list of the Presentation Context Items.
user_information	Return the User Information Item, if available.