H.4 Networking
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## H.4 Networking

### H.4.1 Implementation Model

#### H.4.1.1 Application Data Flow

The division of EXAMPLE-MEDICATION-SYSTEM-GATEWAY into the separate DICOM Application Entities represents their independent logical functionality.

By default all of the defined Application Entities have different AE Titles. However, EXAMPLE-MEDICATION-SYSTEM-GATEWAY can be configured so that the PHARMACY-SCP AE and MAR-SCP AE share the same Application Entity Title.

Figure H.4.2-1. Example-Medication-System-Gateway DICOM Data Flow Diagram

#### H.4.1.2 Functional Definition of AEs

##### H.4.1.2.1 Functional Definition of PHARMACY-SCP Application Entity

The PHARMACY-SCP AE handles incoming external queries for pharmacy (drug and contrast agent) product data, and also handles requests for approval of administration of pharmacy product. The PHARMACY-SCP AE handles queries by translating the standard DICOM queries to the non-standard interface of the Pharmacy Information System and the Patient Registration System.

The PHARMACY-SCP AE waits for another application to connect at the presentation address configured for its Application Entity Title. PHARMACY-SCP AE will accept Associations with Presentation Contexts for SOP Classes of the DICOM Substance Administration Information Service Class, and Verification Service Class. It will handle query requests on these Presentation Contexts and respond with values corresponding to the information provided by the Pharmacy Information System.

##### H.4.1.2.2 Functional Definition of MAR-SCP Application Entity

The MAR-SCP AE receives incoming DICOM notifications of drug or contrast agent administration, and adds them to the Medication Administration Record System database.

The MAR-SCP AE waits for another application to connect at the presentation address configured for its Application Entity Title. The MAR-SCP AE will accept Associations with Presentation Contexts for SOP Classes of the Substance Administration Logging and Verification SOP Classes. Any drug or contrast agent administration images notifications received on such Presentation Contexts will be added to the Medication Administration Record System database.

#### H.4.1.3 Sequencing of Real-World Activities

There are no sequencing constraints across the EXAMPLE-MEDICATION-SYSTEM-GATEWAY Application Entities. Each query or notification is handled independently.

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