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Chapter 3: Applications
This chapter summarizes how to:
Convert a legacy dial-up M2M system to cellular
Maintain compatibility with dial-up modems
For detailed configuration and advanced operating features see the
section in this guide, and see the
Convert A Legacy Dial-up M2M System To Cellular
Properly configured Modemulators are drop-in cellular replacements for dial-up PSTN modems, which
extends the useful life of legacy M2M software and hardware, while providing the benefits of a transition
from the PSTN to the cellular network.
Modemulators normally operate in a peer-to-peer fashion, with a Modemulator on both ends of a
connection. Alternatively, the Modemulator can operate in single-ended mode for a system that has
remote Modemulators connecting directly with a TCP/IP server. Both types of systems are described
below.
Peer-to-Peer Operation
First, follow the
Getting Started
properly.
System Architecture
A legacy M2M host site (Headquarters, Operations Center, etc.) is the source of data being transferred to
all of the remote sites, or is the destination of data being transferred from all of the remote sites. This
host site has application hardware and software that normally interfaces with a serial dial-up modem used
to transfer the data.
The legacy M2M remote sites are the sources of data being transferred to a host site, or are the
destinations of data being transferred from a host site. Each remote site has application hardware and
software that normally interfaces with a serial dial-up modem used to transfer the data.
The Terminal port of the Modemulator at the host site connects to a serial port of the host application
hardware that would normally connect to a serial dial-up modem, and the Terminal port of the
Modemulator at each remote site connects to a serial port of the remote application hardware that would
normally connect to a serial dial-up modem.
An RF survey of the host and remote sites may be necessary to determine if the installations are
in range of cellular reception from the operator chosen to provide service. Consult a professional
cellular installer for assistance.
Modemulator User Guide
USR3520/USR803520 Gateway User
chapter in this guide to verify that two Modemulators are operating
Page 24 of 113
Modemulator Command Reference
Guide.
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