Computer Communication

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Presentation transcript:

Computer Communication Dr. Yinong Chen

A Connected World Source: Intel Embedded Research and Education Summit 2013

Communication and Networking Host A Host B Application Presentation Session Transport Network Physical Data Link Application Presentation Session Transport Network Physical Data Link CS CSE CE EE TCP IP Open System Interconnection (OSI) 7-layer reference model 18 September 2018

Physical Layer, e.g., RS-232, X.25 Physical layer is concerned with processing signals and transmitting raw bits over a communication channel, wired or wireless Issues to be considered: Signal processing frequency selection carrier frequency signal detection modulation / demodulation Analog Telephone Switches RS232C RS499 line Modem 18 September 2018

Signal Processing and Transmission Information is transmitted via varying voltage, current, or frequency in sine or cosine functions. Fourier Function Series: Any periodic function g(t) with period T can be constructed by a number (possibly infinite) of sine and cosine functions. 18 September 2018

Representing Digital Signal in Analog The bigger the n, the faster the computer need to be. 18 September 2018

Modem: Modulation and Demodulation Noise control Analog and digital conversion: voice, photo, video Data compression Modem Analog Telephone Switches RS232C RS499 line Modem 18 September 2018

Conversion from Analog to Digital Signals Measure the height of the amplitude Sender 4 8 15 19 23 24 24 19 13 7 3 0 1 2 4 7 10 12 14 14 13 11 9 6 5 1 0 1 2 5 7 9 11 13 15 15 14 13 10 8 6 5 7 8 11 12 11 Receiver 18 September 2018

NXT Brick Main processor: 32-bit ARM7 microcontroller, with 256 Kbytes FLASH, 64 Kbytes RAM Second processor: 8-bit AVR microcontroller, with 4 Kbytes FLASH, 512 Byte RAM Bluetooth wireless communication USB full speed port (12 Mbit/s) Four input ports, 6-wire cable digital platform Three output ports, 6-wire cable digital platform 100 x 64 pixel LCD graphical display Loudspeaker - 8 kHz sound quality. Sound channel with 8-bit resolution and 2-16 KHz sample rate. 18 September 2018

Bluetooth Wi-Fi 802.11n Wireless Protocol Stack Data Rate Range 120kb – 723 kb 30ft – 300ft Wi-Fi 802.11a 1 - 11Mb 50ft - 150ft Wi-Fi 802.11b 1 - 54Mb 100ft - 300ft Wi-Fi 802.11g 120ft - 350ft Wi-Fi 802.11n 6.5 – 600 Mb IrDA (Infra-red) 9.6kb - 115kb < 6ft 18 September 2018

Establish Communication It sends an invitation to NXT to connect. 18 September 2018

Add the NXT to your Connection On the invitation, your Brick will beep. Push the orange button to accept the invitation; 18 September 2018

Use the passkey and accept on NXT 18 September 2018