Siemens AC75 Manuel D’Utilisation

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AC75_ATC_V01.002

Page 415 of 569

10/30/06

Confidential / Released

This chapter contains AT commands and responses related to the Remote SIM Access (RSA) feature of AC75.

RSA allows AC75 to access and use a remote SIM card via its serial interface in addition to or instead of the SIM

locally attached via the dedicated lines on the interface connector. 

The necessary protocols and procedures are implemented following the "SIM Access Profile (SAP) Interopera-

bility Specification" 

. As stated there it is possible for a SAP client to use a SIM card in an external device

connected via a wireless link. The external device can either be a mobile phone, a PDA or any other mobile

equipment that may be used as SIM card holder. The SIM Access Profile builds on the interface between the

mobile equipment and the SIM card (refer to the "Specification of the Subscriber Identity Module (GSM 11.11)"

). For further details contact the Wireless Modules Application Engineering Department at Siemens AG. 

Figure 

 illustrates an access scenario via Blue-

tooth: 

Since the AC75 itself - acting as SAP client - does not control the Bluetooth wireless link, the communication with

the remote SIM needs to be routed via an external customer application. The external application establishes

and controls the Bluetooth connection. It maps data received over a serial interface channel to data transferred

over a Bluetooth interface and vice versa. 

Figure 

 illustrates an alternative access scenario via

a serial RS232 interface: Instead of Bluetooth it is possible for an external customer application to use a serial

RS232 interface in mapping data for the remote SIM in an external device. In this case an ASCII coded string

format (Siemens' XSAP) is used instead of the binary SAP data format employed for Bluetooth. 

Figure 15.1: Basic Remote SIM Access Usage Scenario via Bluetooth

Figure 15.2: Basic Remote SIM Access usage scenario via RS232