DICOM PS3.8 2020c - Network Communication Support for Message Exchange

9.2 DICOM Upper Layer Protocol for TCP/IP State Machine (Current)
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## 9.2 DICOM Upper Layer Protocol for TCP/IP State Machine

### 9.2.1 Machine States Definition

Table 9-1. No Association

State | Definition
--- | ---
Sta 1 | Idle

Table 9-2. Association Establishment

State | Definition
--- | ---
Sta 2 | Transport connection open (Awaiting A-ASSOCIATE-RQ PDU)
Sta 3 | Awaiting local A-ASSOCIATE response primitive (from local user)
Sta 4 | Awaiting transport connection opening to complete (from local transport service)
Sta 5 | Awaiting A-ASSOCIATE-AC or A-ASSOCIATE-RJ PDU

Table 9-3. Data Transfer

State | Definition
--- | ---
Sta 6 | Association established and ready for data transfer

Table 9-4. Association Release

State | Definition
--- | ---
Sta 7 | Awaiting A-RELEASE-RP PDU
Sta 8 | Awaiting local A-RELEASE response primitive (from local user)
Sta 9 | Release collision requestor side; awaiting A-RELEASE response (from local user)
Sta 10 | Release collision acceptor side; awaiting A-RELEASE-RP PDU
Sta 11 | Release collision requestor side; awaiting A-RELEASE-RP PDU
Sta 12 | Release collision acceptor side; awaiting A-RELEASE response primitive (from local user)

Table 9-5. Waiting for Transport Connection Close

State | Definition
--- | ---
Sta 13 | Awaiting Transport Connection Close Indication (Association no longer exists)

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DICOM PS3.8 2020c - Network Communication Support for Message Exchange