Robustel M1000 User Guide - Manual (Page 58)

Robustel GoRugged M1000 User Guide
RT_UG_M1000 _v.2.0.0
20.12.2013 57 / 83
Confidential
4.5 GPRS Connection (Only Available under Normal Mode)
4.5.1 Overview
GPRS is a packet-switched technology, which means that multiple users share the same transmission channel. In
addition, GPRS transmits only when there is outgoing data. This means that the available bandwidth can be
dedicated solely to data communication when needed. In general, a GPRS network can be viewed as a special IP
network that offers IP connectivity to IP terminals. Devices such as PCs, embedded computers, and PLCs that are
PPP-enabled can be easily connected to the IP network and the Internet.
The modem provides multi-slot Class 10, which means that there are 4 Rx timeslots plus 1 Tx timeslot, or 3 Rx
timeslots plus 2 Tx timeslot. The CS-1 to CS-4 Coding Schemes must be supported by the provider. GPRS offers no
guaranteed data rates or bandwidth. The value assigned by the provider (coding scheme and timeslots) can change
dynamically during a connection.
In general, for the 1 Tx + 4 Rx combination, the Tx throughput is around 8-12 Kbps when the Rx throughput is
around 32-48 Kbps.
For the 2 Tx + 3 Rx combination, the Tx throughput is around 16-24 Kbps when the Rx throughput is around 24-36
Kbps.
4.5.2 Windows GPRS Access
The modem can use Windows DUN (Dial-up Networking) to provide the Internet access through the GPRS mobile
network. Instructions are described in the following chapters.
Note: The specific steps may vary depending on your version of Windows and your Windows settings.
Set Modem Baud Rate to 19200 bps under Normal Mode
1. Select 19200 bps, and then click “Change Baudrate to”;
2. Exit the Modem Configurator.
Note: Please make sure your COM port connecting to the modem is free and do not be used by any software or
application (e.g. Modem Configurator).