FEATURES :
► Based on 89C51 family based processor.
► 40×2 LCD for Display interface and Keyboard entry through IBM PC Keyboard.
► Uses Q2403A Wismo Quick Modules to interface it with microcontroller.
► It has hardware block for doing various experiments.
► Mic input with conditioning circuit.
► Audio output on Headset.
► Keyboard matrix (5×4) for scanning the key codes.
► With LCD of 40×2.
► SIM socket.
► Buzzer.
► Understanding of various functions with the use of AT commands.
► Various SIM signals like Card Read, Card Clock, Card Presence, Card Data are available for debugging.
► With buzzer provides for incoming call.
► External antenna for capturing the incoming signal.
► Various examples using AT commands are given for Phone dialing, SMS Read, Write, Phone book, ADC,
General purpose I/O lines, Keyboard interface to Modem are given.
► Modem can operate through PC as well as standalone system directly
► In-built power supply
GSM Parameters :
► Multiple Access Method -TDMA / FDMA
► Uplink frequencies (MHz) -933-960 (basic GSM)
► Downlink frequencies (MHz) -890-915 (basic GSM)
► Duplexing -FDD
► Channel spacing, KHz -200
► Modulation -GMSK
► Portable TX power, maximum / average (mW) -1000 / 125
► Power control, handset and BSS -Yes
► Speech coding and rate (kbps) -RPE-LTP / 13
► Speech Channels per RF channel: -8
► Channel rate (kbps) -270.833
► Channel coding -Rate 1/2 convolution
► Frame duration (ms) -4.615