Here are some more information for Gprs Modem:

EDGE USB MODEM WHPC-04

Features:

>>| WORLDWIDE WIRELESS FOR THE WORLD WIDE WEB*
EDGE USB Modem WHPC-04 is a quad-band wide area wireless modem supporting all the different frequencies used by EDGE and GSM/GPRS networks worldwide. Users around the globe can enjoy the freedom to have access to critical information wherever they are located on both EDGE and GSM/GPRS networks.

>>| HIGH-SPEED PERFORMANCE
At data rates up to three times the speed of GPRS, EDGE USB Modem provides users with ease of use to transfer large files, download graphic heavy information, send/receive SMS messages and receive large amounts of data quickly, to stay connected during their busy day. With EDGE USB Modem, users can stay connected on EDGE networks at average speeds between 100-130 kbps*, supporting speeds up to 236.8 kbps.

>>| SIMPLE INSTALLATION AND USE?
EDGE USB Modem seamlessly integrates into Windows? notebook or PC. The easy-to-use software helps you install, configure and manage your modem easily and with low power consumption for extended battery life, the modem provides users with superior product performance.

 WORLDWIDE USE WITH QUAD-BAND OPERATION
CAPABLE OF WIRELESS DATA SPEEDS UP TO 236.8 KBPS
LOW POWER CONSUMPTION EXTENDS BATTERY LIFE
DIAL-UP NETWORKING (DUN) MODES
RECEIVE SMS MESSAGES OR VOICE CALLS
ACCESSING E-MAIL AND BROWSING THE WEB

SIM CARD FUNCTIONALITY

 >>| QUAD-BAND EDGE/GPRS:
GSM 850 MHz band Transmit, Receive: 824-849MHz, 869-894MHz?
Output Power: 500 mW (+27 dBm) /2W (+33 dBm)

GSM 900 MHz band Transmit, Receive: 880-915MHz, 925-960MHz
Output Power: 500 mW (+27 dBm) /2W (+33 dBm)

DCS 1800 MHz band Transmit, Receive: 1710-1785MHz, 1805-1880MHz
Output Power: 400 mW (+26 dBm) /1000 mW (+30 dBm)

PCS 1900 MHz band Transmit, Receive: 1850-1910MHz, 1930-1990MHz
Output Power: 400 mW (+26 dBm) /1000 mW (+30 dBm)

>>|OPERATING SYSTEMS SUPPORT:
Windows 2000, NT,XP, Vista

>>| ADDITIONAL CONNECTIVITY SUPPORT*:
EDGE, GPRS, and GSM Circuit Switched Data
Support for Multiple APNs
SMS (send and receive)
Dial-up networking

Voice and fax support

>>| ENVIRONMENTAL:
Operating Temperature: -20 to +60 celsius degree
Storage Temperature: -30 to +85 celsius degree
Vibration (non-operating): 15g peak, 10 Hz to 2 kHz

Humidity: 95% (non-condensing)

About the Author

Block diagram for GSM/GPRS modem.?

Can someone please point me to a direction where i can find block diagrams on GPRS/GSM modulators+demodulators(MODEMS). I need to gather some information on the GSM physical layer, line coding, modulation, BER etc.
thanks, your help is very much appreciated.

Certain aspects of a digital baseband transmitter with digital RF/IF support in GSM/GPRS/EDGE compliant devices may comprise receiving digitized data within a chip. A control signal may be generated within the chip indicating whether the received digitized data is to be processed by an IF processing interface or a digital RF processing interface. The baseband processor has the capability to work together with different kinds of RF chips on the market and since this design is implemented on a single module, most of the circuits are shared which reduces the die size significantly
i am doing msc in mobile communication from greenwich university,i am copying some pdf files and u can see the block diagram if u got ur required ur info from this give me the ten points ok other wise tell me in brief ,i can help u .ok
http://www.comsysmobile.com/images/EDGEware%20DS.pdf
http://solution.eccn.com/pdf/Shiping_063214d.pdf

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