1. Communication Systems I

2. How can information flow from point A to point B?

3. Morse Code Can you spell your name? See http://morsecode.scphillips.com/jtranslator.html for a live demohttp://morsecode.scphillips.com/jtranslator.html

4. Semaphores

5. http://www.globalsecurity.org Semaphore as a Signaling Tool

7. Semaphore as a Communication Tool http://www.wikipedia.org

8. ROGER

9. Nuclear Disarmamenthttp://www.viewimages.com Semaphore in Pop Culture

10. Fountain of Bits

11. Analog Signal Encoding

12. Modem Maximum Data Rate Modem 56Kbps

13. ADSL Maximum Rate? ADSL

14. Why is ADSL much faster? 256 Channels of 4 kHz each

15. How fast is ADSL? ADSL = 256 x 4 kHz x 8 bits = 8 Mbps ADSL2= 12 Mbps ADSL2+= 25 Mbps *ADSL2+ expands channel frequency from 1.1 to 2.2 MHz

16. Serial vs Parallel Transmission Image © Quatec

17. Example of Serial Comm? Example of Parallel Comm?

18. Which Mode is More Common? Cost. Less cables. Smaller size. Simplicity. Keeping bits aligned in a high- speed parallel line requires more complex electronics. Serial Why?

19. The Need for Speed USB 1.0 (12 Mbps) USB 2.0 (480 Mbps) USB 3.0 (4.8 Gbps) Firewire 400 (400 Mbps) Firewire 800 (800 Mbps) SATA (1.5/3.0 Gbps) RS-232 (115.2 Kbps)

20. Synchronous vs Asynchronous A B A B Synchronous uses a clock line Asynchronous relies on a common clock on each side

21. RS-232 (Serial Communication) Baud Rate Data bits Start bit / Stop bits Parity

22. RS-232 Pulses Letter “V” ASCII = 86 (0101 0110 2 ) 9600 bps, 8-N-1 Layout: Start Bit, Data Bits, Parity, Stop Bits * Note: Rs-232 logic pulses are inverted

23. RS-232 Pulses Letter “Y” ASCII = 89 (0101 1001 2 ) 9600 bps, 8-Odd-1 Layout: Start Bit, Data Bits, Parity, Stop Bits * Note: Rs-232 logic pulses are inverted

24. How about ASCII 0? Layout: Start Bit, Data Bits, Parity, Stop Bits The data transmission is unbalanced. Can cause transmission errors. 9600 bps, 8-N-1

25. Manchester Encoding (IEEE 802.3) Bit 1 = Low to High Bit 0 = High to Low

26. Example Image: Wikipedia

27. Data = 0 Manchester Code

28. Encode the following transmissions using the Manchester standard Letter “V” ASCII = 86 (0101 0110 2 ) Letter “Y” ASCII = 89 (0101 1001 2 )