Feature Spec
Modem Emulation
Digi device servers and terminal servers replace modems with Ethernet
Overview
Digi’s modem emulation technology enables a networked Digi
device server or terminal server to act as a modem to send and
receive data over an IP network instead of a PSTN (Public
Switched Telephone Network). This means that equipment that
was designed only for modem access can now communicate
transparently to its corresponding software application across
the Ethernet.
Without modem emulation
Legacy
Application
Application
Server
Serial
Serial
About Modem Emulation
Modem emulation allows a user to easily configure a networked
Digi device server or terminal server as a modem. The Digi
product emulates modem responses to a serial device in the field
and seamlessly sends and receives data over an Ethernet
network. Embedded, pre-designed devices can treat the Digi
device like a modem, but allow it to “dial up” an IP address
instead of a phone number. A key benefit is the ability to retain
legacy software applications and devices without reprogramming
devices in the field. Modem emulation also promotes cost
savings by utilizing an IP network instead of a PSTN.
Set-up is easy. First, the serial device in the field, which normally
dials a phone number, is configured to dial the IP address of the
host it needs to contact. Next, the Digi device server or
terminal server is configured for modem emulation using the
setup wizard. Now, the serial device thinks it is talking to a
modem, when in fact the Digi device accepts the call and
converts it into a TCP/IP connection.
Modem emulation can be used to replace the modem at both
ends of the connection or on just one end using IP sockets.
Common serial devices used with modem emulation include
tank gauges, gaming equipment, credit card machines, card
swipe readers, traffic control equipment, vending machines,
Intelligent Electronic Devices (IEDs), and remote controllers.
Modem
“ATDT 1-211-555-1234”
Modem
• Application dials a phone number, uses
modems to talk over PSTN
With Digi’s modem emulation
172.16.20.201
“ATDT 172.16.20.201”
WAN, VPN,
IP Network
Ethernet
Serial
Serial
PortServer
®
TS
172.16.20.205
PortServer
®
TS
Legacy
Device
Application
Server
• Phone number replaced with IP address of host
• Digi device server or terminal server dials up IP
address to communicate over Ethernet
Features/Benefits
Configure Digi device server
or terminal server to act
as a modem
Allows modem-based legacy
devices and software to
communicate over TCP/IP
•
Products with Modem
Emulation Feature
•
•
•
•
•
•
•
Digi One
®
SP
Digi One IA
PortServer
®
TS 8/16
PortServer TS MEI
PortServer TS H
PortServer TS M
PortServer TS W
Save money using IP networking
instead of PSTN
Faster, more cost-effective
data transfer
•
www.digi.com
© 2004-2009 Digi International Inc.
Digi, Digi International, the Digi logo, the Making Wireless M2M Easy logo, PortServer and Digi One are trademarks or registered
trademarks of Digi International, Inc. in the United States and other countries worldwide. All other trademarks are the property of
their respective owners.
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