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Из курса от партнера University of California San Diego

Internet of Things: Communication Technologies

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University of California San Diego

Internet of Things: Communication Technologies

155 оценки

Курс 4 из 6 — 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.

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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 10:37

Frequent Terminology2:38

A look back at Lesson 10:46

Познакомьтесь с преподавателями

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

As Randy mentioned in our introduction, this is the first video and

as always we start off with the acronyms of things you're gonna see for

the rest of this course.

Now, the more you put into this particular section the less

your gonna have to put in later.

Cuz all of these terms and acronyms that we're gonna talk about,

obviously they're gonna be.

>> Yeah, they come up multiple times.

>> Come up all the time.

You don't wanna have to go reference it.

And if you do have to reference it,

then might as well reference your cheat sheet, right?

>> Right. >> So we're gonna have you make one of

those, just like all the other courses.

Starting off right here, what is VoIP?

VoIP, an acronym, Voice over Internet Protocol.

Now Internet Protocol also on the slides here that you can see is basically

a set of rules that's used to transfer data over what we would call the Internet,

intranet, or any sort of network that functions under the Internet Protocol.

On this list you see a lot of other cool little acronyms,

things that you're gonna see throughout the remainder of this course.

But some ones that we'd like to point out, cuz this list is very long.

PSTN, public switched telephone network, now that's a way for us

to kind of communicate with the old-school telephony networks with VoIP network.

So it's kind of the gateway to kind of- >> So it connects them all.

>> Yeah, connects everything in there.

So that's the gateway that connects VoIP with old school circuit switch networks.

We have SIP, we're gonna go really in depth in that in the next module.

You'll get to see a lot about that, just basically session initiation protocol.

And then the ATA, which also we're gonna go into as well, which is just a form or

a little device that you can hook into your traditional telephone to give it

a analog to digital converter to send your packets over the internet.

>> Right.

>> Right, so here we go.

>> So next- >> Some more-

>> Yeah, we have a lot of,

there are tons of different kinds of protocols.

So we got a couple here listed.

RTP, so that's Real-Time Transport Protocol, where basically the goal is to

try to get real-time data because sometimes you're sending data,

you might have a delay to make sure everything gets sent.

And that might be really annoying cuz you want it instantly, right?

>> [LAUGH] >> So there you go, real time.

But then there's UDP and TCP.

And they're sort of opposites of each other, where the user datagram,

without setting up any kind of channels, it just sends the data right away.

And then TCP, where it just makes a connection beforehand.

So you lose less data, but it's a bit slower.

>> Yeah in a later module you'll see a datagram.

I know we threw that out there but you'll see it in a nice datagram.

We'll show you how it works and stuff.

>> Right.

>> Some other cool acronyms here that you might see us mention or

you might see on the, on the- >> Following modules.

>> In the following modules right here.

Just kinda take a look at it, take some time.

Some interesting ones we think transport layer security.

You'll notice every time you kind of connect to the internet or do something

like that you might have to choose what kind of security you'd like to set for it.

>> Yeah, a certain kind of encryption pattern, or

something like that to make sure that someone can't just steal your data.

>> Yeah exactly. So, you can always go search the Internet,

find out a little bit more.

Go to Wikipedia about it.

Pause it, pause the slide right there.

Go back, pause it and take a look at it.

Next one, something really interesting, one at least I'll talk about the IPvX.

The X is actually just a variable for the version number so

you have the Internet protocol version x.

>> Right. >> Right, so the first actual kind of

prominent version of the IP or the Internet Protocol was the version 4.

Right now, I think the successor is version 6.

But yeah, again, go search Internet Protocol on the Internet,

you'll get the Wiki page.

You can read up a lot more about that.

Maybe search IPv4 or IPv6.

You can probably read up a lot more about the different versions of

the Internet protocol.

Just the rules that were created and we kind of abide by.

Yeah, so GUI, ICE.

You've seen GUI in other of our courses.

GTK, XML, XML's a type of data that's sent.

So there we go.

That was our- >> That was our-

>> Our set of acronyms.

>> Our beefy acronym slides.

>> Make sure you go back, put those on your cheat sheet,

things you might wanna reference.

>> Right, so we'll see you next time.

>> Great.

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