==== 3.6.1 Concurrent Operations Over Multiple Interfaces ====

A Java Card technology compliant proximity contactless card operates in the ACTIVE state and processes commands defined in the **//ISO 14443 Specification//** Parts 1-4. 

The Supervisory block (S-block) DESELECT command results in the proximity card entering the HALT state. 

A loss of RF field results in the proximity card entering the POWER OFF state. 

On a card which is concurrently operating over both the contacted as well as the contactless I/O interfaces, prior to entering the HALT state or POWER OFF state, the Java Card RE must ensure the following: 

 

  *The transaction in progress in the currently selected applet instance executing on a logical channel on the contactless I/O interface, if any, when the S-block DESELECT command is received, or when the loss of RF field occurs, is aborted.    

  *Each applet instance that was active on a logical channel over the contactless I/O interface when the S-block DESELECT command is received, or when the loss of RF field occurs, becomes implicitly deselected. In this case the **deselect** method is not called.    

  *All the logical channels open on the contactless I/O interface are implicitly closed.    

  *Transient data associated with each applet instance that was active on a logical channel over the contactless I/O interface and that does not have an applet instance from the same package active on any logical channel over the contacted I/O interface when the S-block DESELECT command is received, or when the loss of RF field occurs, is reset to the default value.    

Note - To establish a card session over both contacted and contactless interfaces concurrently, the CAD must initiate the contacted session first. A power loss or card reset on the contacted interface results in a card tear and card reset event even if a contactless session is in progress. An RF signal loss on the contactless interface must not affect an ongoing contacted session. 

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