Xircom An Intel Company GEM3501 User Manual
Core Engine GSM/GPRS Modem Developer Guide Preliminary Draft: 7/6/2001
36
Part Number: 07100026, Revision: 002
Confidential
© 2001 Xircom, Inc., an Intel company All rights reserved.
All trademarks and copyrights are the property of Xircom, Inc., an Intel company
All trademarks and copyrights are the property of Xircom, Inc., an Intel company
9
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The GSM SIM can support optional features or services. Most GSM operators typically
configure the SIM to send/receive voice calls and to receive SMS; however, some may
require an additional tariff to enable the SIM to send SMS. The transmission of data and
fax are also additional services that may require tariffs and additional provisioning. Each
of these services has two separate modes that must be enabled to allow the service:
configure the SIM to send/receive voice calls and to receive SMS; however, some may
require an additional tariff to enable the SIM to send SMS. The transmission of data and
fax are also additional services that may require tariffs and additional provisioning. Each
of these services has two separate modes that must be enabled to allow the service:
!
Mobile-originated (MO): allows making a service request (such as, making a call or
sending an SMS)
sending an SMS)
!
Mobile-terminated (MT): allows receiving a service request (such as, receiving a
phone call or an SMS)
phone call or an SMS)
It is imperative for the Core Engine modem that the SIM be configured for the optional
services that are required for the application.
services that are required for the application.
9.1 GSM Services Supported by the Core Engine modem
The Core Engine modem supports three (3) GSM services (modes of operation) that must
be enabled by the operator:
be enabled by the operator:
!
Voice calls (MO and MT): requires a telephone number
!
SMS (MO and MT): uses the telephone number for Voice
!
Circuit-switched data calls (MO and MT): requires a telephone number
The GSM SIM can have multiple telephone numbers: one number for voice calls and SMS
and one number for data calls.
and one number for data calls.
9.2 Selecting the Modes of Operation
When provisioning the SIM for the Core Engine modem, enable the following modes of
operation:
operation:
!
Voice calls: configure the SIM for both MO and MT service (to send and receive)
!
SMS: configure the SIM either for MT alone (to receive) or for both MO and MT (to
send and receive)
send and receive)
!
Data: configure the SIM either for MO alone (to send) or for both MO and MT (to send
and receive)
and receive)
Voice
SMS
Data
Function
MO/MT
MT
MO
Voice calls, receive SMS, make data calls
MO/MT
MT/MO
MO
Voice calls, receive/send SMS, make data calls
MO/MT
MT/MO
MO/MT
Voice calls, receive/send SMS, make/receive data calls
(requires an additional data telephone number)