Chapter 1 – Description & Specification
Benefits/Features in Applications
Short Development Time. The MultiModem GRPS Wireless Modem 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 GRPS 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 GRPS Wireless Modem offers SMS features such as
text and PDU, point-to-point (MT/MO) and cell broadcast.
Compatible Supplementary Services. The MultiModem GRPS Wireless Modem 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 GRPS Wireless Modem provides advanced
management features including phone book management, fixed dialing number, and real time clock
and alarm management.
Industry-standard Modem Commands. The MultiModem GRPS Wireless Modem provides
industry-standard AT-style commands for ease of integration into your existing software application.
Industrial Chassis. The MultiModem GRPS Wireless Modem 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 GRPS Wireless Modem 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 GRPS supports PBCCH and
coding schemes CS1 to CS4, and is compliant with SMG31bis.
Circuit-Switched Data (CSD). The MultiModem GRPS Wireless Modem 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 GRPS Wireless Modem 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.
Multi-Tech Systems, Inc. MultiModem® GPRS User Guide
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