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.”

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Presentation transcript:

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.” Where must the bottleneck be? Welch Hall ERC SAC

Welch Hall ERC SAC 100 mb/s1 gb/s

How does my link differ from those between the buildings on our campus and between the campus and the Internet? mb/s My house Why is it even slower from my home?

S/R Copper vs. fiber optic cable

Questions CPU, memory and network utilization ?

Watch a little and vary image quality.

Which looks better? Which requires a faster communication link? Why? Which requires a faster CPU? Why?

What is this?

Which image is made of more dots? Which image has smaller dots?

Baseline – only the operating system is running

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

Buffer bits in memory for smooth audio and video output Storage Output Memory What else is in memory while the video is playing? 10011

Memory Operating system Video player program

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

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?

Questions about embedded computers ?

Some input/output devices people use What about input/output devices computers use?

What are its input/output devices for interaction with people? There a computer embedded in your microwave oven

What are its input/output devices for interaction with devices? Keypad Display Buzzer

Switch to start cooking unit Switch to turn light on/off Switch to start rotation Internal timer Cooking power level adjustment Temperature sensor Does the oven have memory? Is there a program in its memory? What does it do?

Simplified microwave oven program When the user hits start 1.Read the cooking time 2.Start the oven 3.Start the dish rotating 4.Turn the light on 5.When the cooking time has elapsed 1.Stop the oven 2.Stop the rotating dish 3.Turn the light off 4.Sound the buzzer 5.Stop Do you ever change the program in your microwave oven? Maybe use it as a word processor or play games on it?

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.

Questions about the Internet of smart things ?

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?”

Connect your TV to the Internet of things How does the Chromecast connect to the Internet and your tablet, phone or PC?

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

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

Why is local streaming more demanding on the local device?

Streaming from the Internet: Streaming from the local phone, tablet or PC: