Chapter 1: Product Features
December 31, 2007 AT Commands Reference Manual 1-5
TCP/UDP IP Connection
Overview
The network capabilities are achieved by using different layers of connections. Every layer of
connections provides basic connections to the layer above it. The higher the layer is, the more
capabilities it can provide.
Figure 1-1: System Overview
The three layers of connections are:
• Physical links
• Point-to-point links
• TCP/UDP links
TCP/IP
When establishing the TCP/IP connection the G24 can only be the "initiator". The TCP/IP feature
enables the G24 to be a wireless end point for a TCP/IP socket.
Note: The TCP protocol use the value TTL (Time to live) = 64.
Creating TCP/IP Connections
Connection from the G24 to the Web
The following occurs when creating a TCP/IP connection from the G24 to the Web:
1. The G24 connects to the GPRS network and receives an IP address (using the +MIPCALL
command).
World Wide
Web
GSM/
Gateway
G24
Ter m ina l
RS232
PPP Connection
GPRS
Signaling
GPRS
TCP/UDP IP
Connection
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