המעבדה למערכות ספרתיות מהירות High speed digital systems laboratory הטכניון - מכון טכנולוגי לישראל הפקולטה להנדסת חשמל Technion - Israel institute of technology department of Electrical Engineering Characterization Presentation Performed by: Carmel Yuval, Mishael Avihoo Instructor: Orbach Mony Cooperated with: Qualcomm Israel Fax for cellular phone

המעבדה למערכות ספרתיות מהירות High speed digital systems laboratory Project Goal Transmit fax page from a fax machine to a computer and receive a fax page from a computer to a fax machine.

המעבדה למערכות ספרתיות מהירות High speed digital systems laboratory Abstract Converting analog fax transmission to a digital signal Decoding and interpreting the digital signal Determine the fax call state from the digital signal using state machine, negotiating accordingly with the computer Transmitting an image information to the computer using AT- Commands Repeating the process for the case of the computer initiating the fax call

המעבדה למערכות ספרתיות מהירות High speed digital systems laboratory Block Diagram Fax Computer SLIC Control/feedback DSP

המעבדה למערכות ספרתיות מהירות High speed digital systems laboratory System Input (Fax) The system input is an analog phone line signal The source of the signal is a fax machine The analog signal bandwidth is 2000Hz ( Hz)

המעבדה למערכות ספרתיות מהירות High speed digital systems laboratory System Output (Computer) The system output is an analog serial data The data rate is 9600/14400bps (TBD) The data will contain AT-Commands and image data (Bytes) The computer emulates cellular network modem server, using simple fax software

המעבדה למערכות ספרתיות מהירות High speed digital systems laboratory SLIC S ubscriber Line Interface Circuit Detects the line state (On hook, etc.), sets line state (line tone, etc.) Decodes/creates DTMF signals (dial tones) Converts analog signal to PCM (Pulse Code Modulation), and converts PCM to analog signal Communicates with DSP on serial multichannel 2.048MHz link

המעבדה למערכות ספרתיות מהירות High speed digital systems laboratory DSP Digital Signal Processor Decodes/encodes PCM data Change state at state machine according PCM data or AT- Commands Decodes/encodes image data from PCM data Sends/receives AT-Commands to/from remote server

המעבדה למערכות ספרתיות מהירות High speed digital systems laboratory Feedback (Control Computer) Monitors SLIC activity Reports line state and DTMF data to the DSP Control SLIC according to the DSP commands

המעבדה למערכות ספרתיות מהירות High speed digital systems laboratory Rates and Bandwidth PlaceRate / Frequency Input Hz Output9600/14400bps PCM interface2.048MHz DSP clock20MHz

המעבדה למערכות ספרתיות מהירות High speed digital systems laboratory Time Table WeekGoal Setup Integration Hello World PCM Decode/Encode Compile Old Program Start Porting End Porting Tests