Filter
Top Products
Enfora Enabler II-G Assisted GPS
Modem Integration Guide
7. GSM/GPRS Modes of Operation
GSM/GPRS supports many optional services and modes. The Enfora Enabler II-G A-GPS module
supports the following GSM/GPRS services:
• Circuit-switched data
• Short-Message Services (SMS)
• Class B GPRS Functionality
• Voice communication
7.1. Enabling the Transmission Modes for the GSM/GPRS Services
Each of the GSM/GPRS services has two modes that can be enabled separately:
• Mobile-originated (MO): allows the making of a service request (such as, making a telephone call
or sending an SMS)
• Mobile-terminated (MT): allows receiving a service request (such as receiving a telephone call or
an SMS)
Note: Contact your local GSM operator to ensure that the services and modes have been
provisioned for the SIM.
7.2. Voice Communication
The Enfora Enabler II-G A-GPS module has full voice capabilities, provided the necessary
connections have been made for the speaker and microphone pins on the 60-pin I/O connector. The
Enfora Enabler-IIG AT Command Set Reference - GSM0107PB001MAN has the entire list of
commands that can be used to control the voice functionality. The quick start guide in this manual
provides a basic command set that can be used to initialize and test the voice functionality.
The Enfora Enabler II-G A-GPS module supports three vocoder compression algorithms for voice
communication: Full-Rate (FR), Enhanced Full-Rate (EFR), and Half-rate (HR).
7.3. Circuit-Switched Data
In this mode, the Enfora Enabler II-G A-GPS module supports both of the connection modes of
transmission that are provided by GSM:
• Non-Transparent mode delivers a constantly low error rate but with a non-guaranteed throughput
or delay. The Non-Transparent service provides a performance that is closest to using a modem
over a fixed Public Switched Telephone Network (PSTN) line.
Note: All GSM service providers may not support transparent mode. In those cases, the Enfora
Enabler II-G A-GPS module can be configured to switch automatically to Non-Transparent mode.
This capability depends on the settings in the AT+CBST command.
MLG0208PB001 40 Version1.01 – 10/3/2006