Communication Systems I. How can information flow from point A to point B?

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Presentation transcript:

Communication Systems I

How can information flow from point A to point B?

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

Semaphores

Semaphore as a Signaling Tool

Semaphore as a Communication Tool

ROGER

Nuclear Disarmamenthttp:// Semaphore in Pop Culture

Fountain of Bits

Analog Signal Encoding

Modem Maximum Data Rate Modem 56Kbps

ADSL Maximum Rate? ADSL

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

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

Serial vs Parallel Transmission Image © Quatec

Example of Serial Comm? Example of Parallel Comm?

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?

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)

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

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

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

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

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

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

Example Image: Wikipedia

Data = 0 Manchester Code

Encode the following transmissions using the Manchester standard Letter “V” ASCII = 86 ( ) Letter “Y” ASCII = 89 ( )

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