Technical Description; Audio; Overview; Features And Benefits - Motorola AT Commands G24-L Developer's Manual

Improved OEM Features

Technical Description

Figure 1-1, "System Overview," on page 1-5
following links and layers:
Physical layer links:
•
The terminal is connected to the G24-L using a physical RS-232 connection.
•
The G24-L is connected to the GGSN using a GPRS link.
•
The GGSN is connected to the Internet via some sort of physical connection (usually
telephone or cable).
Point-to-point layer links:
•
AT command protocol is used to transfer data between the terminal and the G24-L.
•
After authentication, the G24-L is linked to the GGSN using PPP protocol.
•
The GGSN is connected to its Internet service provider using some protocol.
TCP / UDP layer:
•
The G24-L can transfer data with the WEB using either TCP/IP or UDP/IP protocols.
•
The protocol stacks in the terminal or in the OEM must be managed when using TCP/IP or
UDP/IP protocols. The G24-L software can manage these stacks internally. This enables the
G24-L to relieve the terminal from the job of managing these protocols.
Note:

Audio

Overview

The audio (digital and analog) feature in the G24-L module involves three main issues: path
(routes the current input and output devices), gain (volume management) and algorithm. For
more information, refer to

Features and Benefits

The following algorithm related features are provided:
Sidetone
Sidetone reduces the microphone audio input that is routed to the selected speaker so that the
person speaking can hear himself or herself talking. This creates a slight echo because the speaker
1-8
Currently, the embedded TCP/IP feature may be used only for mobile-initiated
connections. The embedded. TCP/IP feature cannot listen on a port for incoming
connections.
"Audio" on page
G24-L AT Commands Reference Manual
displays the system overview which comprises the
3-155.
April 15, 2008