Internet Protocol

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En provenance du cours de University of California San Diego

Internet of Things: Communication Technologies

152 notes

University of California San Diego

Internet of Things: Communication Technologies

152 notes

Cours 4 sur 6 dans Specialization Internet of Things

Have you wondered how “Things” talk to each other and the cloud? Do you understand the alternatives for conveying latency-sensitive real time data versus reliable signaling data? Building on the skills from the Sensing and Actuation course, we will explore protocols to exchange information between processors. In this course, you will learn how VoIP systems like Skype work and implement your own app for voice calls and text messages. You will start by using the Session Initiation Protocol (SIP) for session management. Next, you will learn how voice codecs such as Adaptive Multi Rate (AMR) are used in 3G networks and use them for voice traffic in your app. Learning Goals: After completing this course, you will be able to: 1. Implement session initiation, management and termination on your DragonBoard™ 410c using SIP. 2. Discover other users and exchange device capabilities. 3. Compare and contrast narrowband and wideband codecs and experience the voice quality differences between them. 4. Implement and demonstrate VoIP calls using the DragonBoard 410c.

À partir de la leçon

Terminology/Cheat Sheet (Beginner)

In this course, you will see a lot of new words and acronyms you might not be familiar with. If you feel comfortable with your knowledge of tech terminology, feel free to skip these lessons since they will not affect the overall integrity of the course. If you see something that you want to know a little more about, feel free to watch the video to gain insight on some basic concepts. We do expect you to know the majority of this material before going into the next module, we would recommend going through the lessons as a quick brush up.

Introduction to Lesson 21:04

Software Stack4:27

Internet Protocol4:18

Packet-switched Network3:51

A look back at Lesson 22:41

Rencontrer les enseignants

Ganz Chockalingam
Principal Engineer
Qualcomm Institute of Calit2, UC, San Diego
Harinath Garudadri
Associate Research Scientist
Qualcomm Institute of Calit2, UC, San Diego

In this video we're going to go a little bit more in depth about the Internet

protocol and kind of talk to you about packets or data grams.

Same thing.

>> Right.

>> So, let's take a look at kind of what the Internet protocol is.

Now, a lot of this information up there is just pulled from Wikipedia.

Feel free to go search Internet protocol in your search engine and

go to the Wikipedia page.

You'll find a lot of this stuff up there,

this is kind of just a condensed form of it.

But yeah, so if you want to take a look at the screen here,

you can see just kind of the basic points of what Internet protocol is.

And what is it?

Well, it's the principal communications protocol for the Internet Protocol Suite.

And there's that terminology.

>> Right, that we mentioned before.

>> You remember, it's the same thing.

We're just saying that- >> It's a way for

computers just to talk to each other.

>> Yeah, that being said, the Internet protocol is kind of what's used,

like he said, to take a computer, a device, right?

That's hooked into a network and then have that device or

that network hooked into other networks.

So that's kinda basically what the Internet is.

It is just a bunch of networks connected to each other working over this

Internet protocol, right?

So I think that's how it first started.

>> Yeah, it's just a way to standardize all the messages and sending,

receiving, cuz if you have different ways to encode it,

it would be very difficult to understand everything.

>> Yeah, it's universal, right?

They had to come up with version for this, but this is how it started.

You call I think a single network, the intranet, right?

So you could have a university that functions on their own intranet, and

that's a private version of the Internet and then they take their network and

they hook it up to the Internet where all these other intranets or

networks are hooked into and you get, and they're all working under the same

protocol basically to send and receive their packets of information.

>> Right. Right. And then you get a giant web of everything.

>> Yeah.

So we're gonna be working with the same protocol using our

VoIP- >> Right.

>> Software. >> [LAUGH]

>> Right.

>> Or our void per application.

>> Right.

Great, so as you can see there, we talked about this in the last lesson, but

right now you have two different versions to choose from for the Internet protocols.

You have IVP or IPv4 and IPv6, what happened to one, two, three and five?

>> [LAUGH] >> Who knows.

>> Who knows, yeah. No, this is the most prominent one so

you'll basically see those floating around these modules and on the Internet.

All right so, the datagram construction kinda talking a little

bit more in depth about Internet protocol or packet, right?

You can see on I guess the second level from the bottom,

you have IP header and IP data.

So I'm gonna kinda shrink this.

We're gonna talk a little bit more about it.

IP header and IP data, every packet or datagram has a header and

a payload, so essentially a header telling it where it needs to go.

[COUGH] And then a payload which is data, information it wants to send.

Going a little bit more in depth on this particular packet as a whole, if

you look at the very top the application side, well this is the application layer,

this is where kind of, the interaction is happening, so to say.

Then you have the transport layer where it gets all of this stuff ready to

be transported, ends up at the IP layer and,

or the Internet layer where it sets the addresses,

gets it all rounded up and throws it out, and then the hardware level.

So that would be the link to the hardware level.

There's not much more to really go into this, but

I mean this is a very high level explanation.

There's a lot more to do with the Internet protocol.

We will run into it again I think later on,

module four or something >> Right.

Huh. >> When we start to build the application.

But until then, it should be enough, otherwise feel

free to go search the Internet and- >> Look up-

>> Internet protocol.

Yeah, internet protocol.

>> Diagrams.

>> Yeah, have some fun with it.

It's definitely a lot of information to absorb.

But there you go.

We'll see you in the next video.

And yeah.

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