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TC63_ATC_V00.490

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In general, the ME can operate either as SAP server or as SAP client. A brief description of the configuration is

given below. 
• SAP Server

The SIM Access Server has direct (galvanic) access to a SIM. It acts as a SIM card reader, which assists the

client in accessing and controlling the SIM via the serial link. Typical examples of a server are SIM card reader

or cellular phones which are integrated in a car environment.

After SAP client activation (see (1) in Figure 

) the ME starts sending the

SAP message CONNECTION_REQ. However, the client will still use its local SIM card until a server

responds and the parameter negotiation with subsequent ATR access has been accomplished successfully.

Figure 15.2: SIM usage states of SAP server