Week #13: (4/18-22) Ethernet and Networking Concepts

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Week #13: (4/18-22) Ethernet and Networking Concepts

Post by rjagodowski »

NOTE: The evening section of this course will work on constructing their soldering kits this week (4/19). The Day classes will follow the usual schedule.

We'll begin the lecture finishing up discussion of the Electromagnetic Compatibility handout from Week #11 with emphasis on shielding techniques. The we will begin and spend the next couple of weeks discussing Ethernet concepts. Ethernet is the prevailing networking technology used to allow computers & peripherals to share resources and access.

From Wisc-Online:

A Presentation of Bandwidth

Bandwidth Capacity Techniques

How Ethernet Works

Data Flow on the Internet


IP Addressing & Subnetting

Wireless Hardware (NOTE: Bluetooth IS NOT infrared, as this presentation suggests. It is a PAN (Personal Area Network), however.) For some additional background about the Electro-Magnetic Spectrum, check out this link. And this document probably has more on antenna design than you want to know:
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Cisco Industrial Networking (for IT Techs) and Cisco Industrial Networking (for Control Systems Techs.


Wireless Sensor Networks in Industrial Automation Here is the link to the complete Factory Automation Text with pdf download here: Here's a pdf on Wireless Sensor Networks for Industrial Process Monitoring and Control: Wikipedia on M2M

50 Sensor Applications for a Smarter World

Most wireless data systems use a form of "Spread Spectrum" (SS) communications. This of wide band communication scheme. This is a crude example, but thing of the FM radio band. You want to tune into WAQY, you adjust the tuner to 102.1 MHz and there it is. All of the time. FM commercial radio stations always transmit at the same frequency. That makes them easy to find. However, it also is not necessarily an efficient use of the total spectrum space of the FM band (roughly 88 MHz to 108 MHz, 20 MHz bandwidth). Each radio station must be separated by at least 200 kHz from an adjacent station to minimize interference. Spread Spectrum communication would have our WAQY transmitted distribute (spread) it's content over the entire 20 MHz FM spectrum. There are different ways of implementing this, but using our radio example, one way would be to use Frequency Hopping where WAQY would transmit at 102.1 MHz for a short period of time, then switch to 93.1 MHZ,a then 94.7 MHz, then 106.9 MHz, etc. Obviously, this would require the receiver (your radio) to tune into the same frequencies at the same times. It sounds complicated, but this tends to have numerous advantages principally in the way in which it fully utilizes the spectrum space (bandwidth), can support multiple users simultaneously, and noise immunity. These types of signals also offer a high level of security against "eaves-dropping" and a high resistance to jamming.

An Introduction to Spread Spectrum Communications.

QAM Comparison from Radio-Electronics.com

QAM from National Instruments.

QAM Tutorial (Pay special attention to Figures 3 & 4.
QAM Tutorial.pdf
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Way too mathematical for our discussions, but some good simulated QAM signals using Matlab: Matlab QAM Simulation.
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