Chapter 1 – Description & Specifications
Multi-Tech Systems, Inc. MultiModem GSM/GPRS User Guide 9
Benefits/Features in Applications
Short Development Time. The MultiModem GSM/ GPRS can make your existing and next
generation device, machine, or system, communication-ready without requiring any hardware
changes to its design. It actually provides faster time-to-market because it relieves the burden and
expense of obtaining network and RF approvals. This complete, ready-to-deploy wireless modem
allows you to enhance your product while you focus on developing its core features.
Voice Features. The MultiModem GSM/GPRS provides telephony and Dual Tone Multi Frequency
(DTMF) functionality. It also allows for emergency calls as well as echo cancellation and noise
reduction (option), and full rate, enhanced Full Rate and Half Rate (FR/EFR/HR).
Short Message Services. The MultiModem GSM/GPRS offers SMS features such as text and
PDU, point-to-point (MT/MO) and cell broadcast.
Compatible Supplementary Services. The MultiModem GSM/GPRS is compatible with
supplementary services such as call forwarding, call barring, multiparty, call waiting and call hold,
calling line identification, advice of charge, USSD, closed user group and explicit call transfer.
Management Features. The MultiModem GSM/GPRS provides advanced management features
including phone book management, fixed dialing number, and real time clock and alarm
management.
Industry-standard Modem Commands. The MultiModem GSM/GPRS provides industry-standard
AT-style commands for ease of integration into your existing software application.
Industrial Chassis. The MultiModem GSM/GPRS is packaged in a rugged, water resistant,
industrial chassis. The chassis has an RS-232 DE-15 Voice/Data interface connector and a
permanent screw-type power connector. It also has an SMA antenna connector. The chassis can
be side-mounted on a panel or top-mounted on a desktop or other surface. A set of LEDs indicates
the modem’s operational status.
Packet-Switched Data. The MultiModem GSM/GPRS supports GPRS Class 10 packet-switched
cellular data. This enables mobile Internet functionality by allowing interworking between the
existing Internet and the cellular network at speeds up to 85K bps. Any service that is used over
the fixed Internet today – File Transfer Protocol (FTP), web browsing, chat, e-mail, telnet -- is
available over the cellular network, as well. The MultiModem GSM/GPRS supports PBCCH and
coding schemes CS1 to CS4, and is compliant with SMG31bis.
Circuit-Switched Data (CSD). The MultiModem GSM/GPRS also supports GSM circuit-switched
cellular data connections. Circuit-switched data connections support speeds up to 14.4K bps,
Class 1 and Class 2 Group 3 fax, as well as MNP2 V.42bis compression. CSD cellular wireless
connections are ideal for applications that require a quick wireless replacement of an existing point-
to-point analog dial-up connection. They integrate seamlessly with your current application
requiring little infrastructure change.
Internet-Enabled. The MultiModem GSM/GPRS includes an embedded TCP/IP protocol stack to
bring Internet connectivity to any device. Using the embedded Internet protocols and the wirless
connection to an IP network, it sends and receives data over the Internet. It can also serve a single
web page in response to a web browser request.