Siemens TC63 - Manual (Page 374)

TC63 AT Command Set s
TC63_ATC_V00.490 Page 374 of 501 5/24/05
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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 15.2 , SIM usage states of SAP server ) 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