December 31, 2007 AT Commands Reference Manual 1-1
Chapter 1: Product Features
Connectivity Interface
The user can establish two types of connections in order to establish an AT command session with
the G24:
• RS232 connection
• USB connection
The user can use either RS232 or USB connections, but not both simultaneously.
GPRS Operation
Overview
The GPRS allows the service subscriber to send and receive data in an end-to-end packet-transfer
mode, without utilizing network resources in circuit-switched mode.
Features and Benefits
GPRS enables the cost-effective and efficient use of network resources for packet mode data
applications:
• Always connected.
• No setup time before data transmission.
• Cost change based on current data communication (not time based).
Technical Description (GPRS – Class B Operation)
The G24 is attached to both GPRS and other GSM services, but can only operate one set of
services at a time (GPRS or CSD).
The G24 can activate a GPRS context and at the same time be alerted for an incoming CSD call.
This functionality is available on the G24 single serial line by either of two procedure options:
Option 1:
1. While in GPRS, listen to the RI signal (RS232) for an incoming CSD call ring.
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