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Enfora Enabler II-G Assisted GPS
Modem Integration Guide
6.7. Subscriber Identity Module (SIM) Carrier
The SIM, an integral part of any GSM terminal device, is a “smart card” that is programmed with
subscriber information:
• The user information consists of an International Mobile Subscriber Identity (IMSI) number,
which is registered with the GSM provider, and an encryption Ki (pronounced "key"). This
information consists of a microprocessor and memory installed on a plastic card.
Note: The SIM is not provided with the Enfora Enabler II-G A-GPS module. The SIM must be
obtained from the GSM service provider and must be provisioned by the operator for data and/or voice.
Always take care to protect the SIM: the GSM terminal will not operate without the SIM installed.
The SIM provides the IMSI for authentication. To gain access to the GSM network, the network must
recognize the IMSI number, and the terminal must be able to properly decrypt the data sent by the
network. The SIM also serves as a buffer for SMS messages, storing the message for transmission until
a radio link is available and buffering received messages until retrieved.
6.7.1. SIM Integration for the Enfora Enabler II-G A-GPS Module
The Enabler II-G A-GPS module default configuration does not include an on-board SIM carrier.
Enfora provides a separate product SKU for the Enabler II-G A-GPS module with the integrated
SIM carrier.
6.7.2. Using a Remote SIM with the Enfora Enabler II-G A-GPS Module
The Enabler II-G A-GPS module default configuration does not include an on-board SIM carrier.
If the module is going to be integrated using a remote SIM, the following guidelines are provided:
• To utilize a remote SIM, the integrator must provide a suitable SIM connector on the
Application.
•
The maximum distance from the Enabler II-G A-GPS module to the remote SIM
connector must not exceed 25.4 cm (10 inches).
Remote SIM Power Parameter/Conditions MIN TYP MAX UNIT
V
DD
Remote SIM Supply Voltage
3 V Mode
2.7 3.3 Vdc
I
DD
Remote SIM Supply Current –
3V Modes
10 mA
Remote SIM Line Description
SIM_VDD
Remote SIM power supply
SIM_RST
Remote SIM reset
SIM_CLK
Remote SIM clock
SIM_I/O
Remote SIM serial data interface
MLG0208PB001 38 Version1.01 – 10/3/2006