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Page 1: Questions about communication link and speed ?. Why was Internet access slower from SAC than from ERC? Packets from both reach the Internet in two “hops.”

Questions about communication link and speed

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Page 2: Questions about communication link and speed ?. Why was Internet access slower from SAC than from ERC? Packets from both reach the Internet in two “hops.”

Why was Internet access slower from SAC than from ERC? Packets from both reach the Internet in two “hops.” Where must the bottleneck be?

WelchHall

ERCSAC

Page 3: Questions about communication link and speed ?. Why was Internet access slower from SAC than from ERC? Packets from both reach the Internet in two “hops.”

WelchHall

ERCSAC100 mb/s 1 gb/s

1 gb/s

Page 4: Questions about communication link and speed ?. Why was Internet access slower from SAC than from ERC? Packets from both reach the Internet in two “hops.”

How does my link differ from those between the buildings on our campus and between the campus and the Internet?

15-20 mb/sMy house

Why is it even slower from my home?

Page 5: Questions about communication link and speed ?. Why was Internet access slower from SAC than from ERC? Packets from both reach the Internet in two “hops.”

S/R S/RCopper vs. fiber optic cable

Page 6: Questions about communication link and speed ?. Why was Internet access slower from SAC than from ERC? Packets from both reach the Internet in two “hops.”

Questions CPU, memory and network utilization

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Page 7: Questions about communication link and speed ?. Why was Internet access slower from SAC than from ERC? Packets from both reach the Internet in two “hops.”

http://bit.ly/14xEeUs

Watch a little and vary image quality.

Page 8: Questions about communication link and speed ?. Why was Internet access slower from SAC than from ERC? Packets from both reach the Internet in two “hops.”

Which looks better?

Which requires a faster communication link? Why?

Which requires a faster CPU? Why?

Page 9: Questions about communication link and speed ?. Why was Internet access slower from SAC than from ERC? Packets from both reach the Internet in two “hops.”

What is this?

Page 10: Questions about communication link and speed ?. Why was Internet access slower from SAC than from ERC? Packets from both reach the Internet in two “hops.”

Which image is made of more dots?

Which image has smaller dots?

Page 11: Questions about communication link and speed ?. Why was Internet access slower from SAC than from ERC? Packets from both reach the Internet in two “hops.”

Baseline – only the operating system is running

Page 12: Questions about communication link and speed ?. Why was Internet access slower from SAC than from ERC? Packets from both reach the Internet in two “hops.”

Viewing low resolution video

Why did memory utilization increase when the video was playing?Why did CPU load increase when the video was playing?

Page 13: Questions about communication link and speed ?. Why was Internet access slower from SAC than from ERC? Packets from both reach the Internet in two “hops.”

10110

11101

101001101010010101010010101101110101001010101010100101010101010100101010010101010100100101010101001010101

Buffer bits in memory for smooth audio and video output

StorageOutput

Memory

What else is in memory while the video is playing?

10011

Page 14: Questions about communication link and speed ?. Why was Internet access slower from SAC than from ERC? Packets from both reach the Internet in two “hops.”

101001101010010101010010101101110101001010101010100101010101010100101010010101010100100101010101001010101

Memory

Operating system

Video player program

Page 15: Questions about communication link and speed ?. Why was Internet access slower from SAC than from ERC? Packets from both reach the Internet in two “hops.”

Viewing high resolution

Why did memory utilization increase when the resolution increased?Why did CPU load increase when the resolution increased?

Page 16: Questions about communication link and speed ?. Why was Internet access slower from SAC than from ERC? Packets from both reach the Internet in two “hops.”

Increased quality from 144p to 1080p

Network utilization

Why did network utilization increase when the resolution increased?Why does network utilization vary rather than remain constant?

Page 17: Questions about communication link and speed ?. Why was Internet access slower from SAC than from ERC? Packets from both reach the Internet in two “hops.”

Questions about embedded computers

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Page 18: Questions about communication link and speed ?. Why was Internet access slower from SAC than from ERC? Packets from both reach the Internet in two “hops.”

Some input/output devices people use

What about input/output devices computers use?

Page 19: Questions about communication link and speed ?. Why was Internet access slower from SAC than from ERC? Packets from both reach the Internet in two “hops.”

What are its input/output devices for interaction with people?

There a computer embedded in your microwave oven

Page 20: Questions about communication link and speed ?. Why was Internet access slower from SAC than from ERC? Packets from both reach the Internet in two “hops.”

What are its input/output devices for interaction with devices?

KeypadDisplayBuzzer

Page 21: Questions about communication link and speed ?. Why was Internet access slower from SAC than from ERC? Packets from both reach the Internet in two “hops.”

Switch to start cooking unitSwitch to turn light on/offSwitch to start rotationInternal timerCooking power level adjustmentTemperature sensor

Does the oven have memory?Is there a program in its memory? What does it do?

Page 22: Questions about communication link and speed ?. Why was Internet access slower from SAC than from ERC? Packets from both reach the Internet in two “hops.”

Simplified microwave oven program

When the user hits start1. Read the cooking time2. Start the oven3. Start the dish rotating4. Turn the light on5. When the cooking time has elapsed

1. Stop the oven2. Stop the rotating dish3. Turn the light off4. Sound the buzzer5. Stop

Do you ever change the program in your microwave oven? Maybe use it as a word processor or play games on it?

Page 23: Questions about communication link and speed ?. Why was Internet access slower from SAC than from ERC? Packets from both reach the Internet in two “hops.”

No

It comes from the factory with the cooking control program in memory.

Since you never change the program, it is in a special kind of memory called read-only memory

Since you never change the program, the oven does not need a storage device.

Page 24: Questions about communication link and speed ?. Why was Internet access slower from SAC than from ERC? Packets from both reach the Internet in two “hops.”

Questions about the Internet of smart things

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Page 25: Questions about communication link and speed ?. Why was Internet access slower from SAC than from ERC? Packets from both reach the Internet in two “hops.”

This is a “dumb” TV set and it is not connected to the Internet

Can I connect it to the Internet and make it “smart?”

Page 26: Questions about communication link and speed ?. Why was Internet access slower from SAC than from ERC? Packets from both reach the Internet in two “hops.”

Connect your TV to the Internet of things

How does the Chromecast connect to the Internet and your tablet, phone or PC?

Page 27: Questions about communication link and speed ?. Why was Internet access slower from SAC than from ERC? Packets from both reach the Internet in two “hops.”

What would be the communication path for streaming video from your tablet, phone or PC to the TV set?

Page 28: Questions about communication link and speed ?. Why was Internet access slower from SAC than from ERC? Packets from both reach the Internet in two “hops.”

What is the data path for a video being streamed from the Internet?

Page 29: Questions about communication link and speed ?. Why was Internet access slower from SAC than from ERC? Packets from both reach the Internet in two “hops.”

Why is local streaming more demanding on the local device?

Page 30: Questions about communication link and speed ?. Why was Internet access slower from SAC than from ERC? Packets from both reach the Internet in two “hops.”

Streaming from the Internet:

Streaming from the local phone, tablet or PC: