Gsm/Gprs Modes Of Operation; Enabling The Transmission Modes For The Gsm/Gprs Services; Voice Communication; Circuit-Switched Data - Enfora Enabler III-G Integration Manual

Enfora Enabler III-G
Modem Integration Guide

7. GSM/GPRS Modes of Operation

GSM/GPRS supports many optional services and modes. The Enfora Enabler III-G 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 III-G module has full voice capabilities, provided the necessary connections have
been made for the speaker and microphone pins on the 100-pin I/O connector. The Enfora Enabler-
III-G AT Command Set Reference - GSM0308PB001MAN 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 III-G 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 III-G 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 III-G module can be configured to switch automatically to Non-Transparent mode. This
capability depends on the settings in the AT+CBST command.
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