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GSM0128IG001
42
Revision Draft – 9/22/08
6.10
Subscriber Identity Module (SIM) Carrier (Pins 48, 52, 54, 55)
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 IIG 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.
6.10.1
SIM Integration for the Enfora Enabler IIG Module
The Enabler IIG default configuration does not include an on-board SIM carrier. Some versions may include
an on-board SIM carrier. Enfora provides a separate product SKU for the Enabler IIG module with the
integrated SIM carrier.