Chapter 1: Features; Introduction; Overview Of Main Features - US Robotics USR3520 User Manual

Chapter 1: Features

Introduction

The USRobotics Courier Modemulator allows a legacy M2M system to be conveniently converted to cellular
without upgrading or replacing application software. The Modemulator accepts and responds to analog
modem commands and sends result codes that mimic a PSTN connection, which allows drop-in
compatibility with legacy application software.

Overview of Main Features

The following features and capabilities assure an easy transition from dial-up to cellular M2M.
Cellular Gateway Engine
The Modemulator is embedded into a full-featured cellular gateway, and connects to cellular networks
using the gateway resources.
Operating Modes
The Modemulator operates in two distinct modes, which are selected by a MODE switch on the front of the
device.
 Modemulator mode
 Gateway mode
Modemulator Mode
In Modemulator mode, the Modemulator's command line user interface emulates the behavior of a serial
dial-up modem connecting over the PSTN.
 Modem AT command set
 Originate or answer calls
 PSTN response codes
 Translate up to 7200 phone numbers into IP addresses
Cellular Gateway Mode
When in cellular gateway mode, the Modemulator configures the base unit to operate as a full-featured
cellular gateway. Some of the key gateway features are:
 Interoperability with most cellular networks
 GPS receiver
 One 10/100 Mbps RJ45 Ethernet port
 One DB9 RS-232 DCE serial port
 IPsec VPN
 Firewall
 Graphical User Interface
Modemulator User Guide
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