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“You view services such as aol. Then you ve probably heard of the infamous dial dial up sound. You know the one you know why does it sound that way and how come every time you connect to the internet. It mostly sounds the same well today.
We re going to be analyzing the sound respect to bram to see exactly what s going on it turns out that all those sounds have a key role during the process or a handshake now keep in mind that this specific track. We re going to be analyzing is not you recorded by me. It s something that i ve found online even though i do have windows 95 vmware running like a pewter. I can t actually connect the modem to it because it s a laptop now without further ado.
Let s go and analyze the track first off let s hear. The track in full you now first let s start with this club this right here is a dial tone. If you don t know what a dial tone. Is is just something that the phone does to ensure that s ready to make a call.
But keep in mind. This is not a phone doing. This is the modem now next up is this now modems and services. Usually do is call an actual number in fact i put a cool arewell number searching thing in the description.
What s weird about this number. Though is that it s 12 digits long suggesting that might be from china or finland. Or something like that now here s where the real handshake begins now we re going to be analyzing these four beeps..
It s important to note that this signal is coming from the other end of the line. Or the answering modem basically the modem on the other end is trying to initiate. What s known as a modem protocol. Standard using one of these standards means that both the calling and the receiving modems can talk in a language that they understand most commonly the vhb standard once the receiving loading requests switch into a standard.
Then it will emit this tone. Now the receiving modem wants the callin modem to list this standard. That s capable of doing. Which there are a whole bunch of and they can all vary in speed this tone is the calling modem accepting the request this tone is the calling modem trying to switch into information transfer mode.
Which is a fancier version of data transferring except with user related information. If you forgot what these tones. Sounded like then let s play them over one more time also i ll use little modem icons to signify whether the signal is coming from the calling modem or the receiving modem. Now.
We know that the modems are ready to transfer information more kind of information. What we re about to see next up release three thingies. All of this is the data in question. All.
This binary is being translated to a process called frequency. Shift keying this bit right here is coming from the calling modem includes some of its most basic modulation protocol standards. Which is more often than not the eight bia this bit also includes information on whether or not it can signify acknowledgement with your problem..
We can and some other information that somehow we needed this right here is coming from the receiving modem. It s suggesting which modem protocol standard to start out with not necessarily keep all the way through after all there are other much faster standards. This final bit right here is coming from the calling modem and does nothing else. Except to say.
Okay. I agree now let s listen to this part one more time. And again. I ll put the little icons up there next up is this part this tone is emitted by the receiving modem.
This tone. Disables echo suppression. Because if echo suppression was enabled it could corrupt data. But what is echo suppression well let me explain if you talk into your phone.
There s a chance that you might be able to hear yourself on the other end which can get pretty annoying. So that s why phone companies have echo suppression. So that won t happen as much now that s good for people when they talk on the phone. But bad for modems because as i mentioned before it could corrupt data being transmitted over the phone lines.
So that s why we have dis tone this bit is emitted by the caller modem is just the same thing played over six times. The calling modem is giving some other information. But mainly two things first it lists all as possible standards and second in list this type of connection to the public switched telephone network..
Which could be either a landline cellular or even a satellite just name a few this last. Bit is amended by the receiving modem and is repeated three times. It too is also listing as standards and type of connection to the network. Now let s move on to the probing segment in order to understand this let me explain carrier waves carrier waves are modulated wave forms that carry information.
The carrier frequency is the center frequency of that carrier wave all this is coming from both the calling and the receiving modems and it s basically them trying to settle on a carrier frequency this part also defines the modulation rate. Which is very similar to the bit rate as in they both defined the bits per second. So basically how fast can we do all these ones and zeros now one of these tones will actually a whole bunch of tones. But one of these tones comes from the calling modem and the other comes from the receiving modem.
These layers of tone are probing signals used to measure the actual telephone lines. That is if the connection is over a landline or not this tone is emitted by the calling modem and is a list of achievable bit rates and modulation rates. This part is coming from the answering modem is the answering modem deciding on a final bit rate as well as a final modulation rate. If there are any issues for this processor.
All stated throughout this part so they can be compromised later. Now. Let s listen to this part. One more time next is this part and of all this data.
Some of it has to do with the final final decision of the bitrate. Most of it however is just random data. This one s coming from the receiving modem and this one s coming from the callin modem..
They have to learn how each of them sound. Nor. The setup a full duplex transmission mode. Which will allow them to talk at the same time now this one you can t usually hear over normal circumstances.
But we re going to play it anyway this right here is the sound of victory means. That yeah you did it everything you did so far successful. This is a minute by both the calling and the receiving mode because they did it they can talk at the same time now. This is your data.
This is what you came to the internet for whether it be text or text now before i end the video. Let s recap everything dial tone. Then dialing a number when question is switching to a modulation method and then accepting figuring out which standard to start out with the sampling. Echo.
Suppressors and then listening modem standards. Deciding bit rates and measuring phone lines. Sending a whole bunch of random data in order to set up before duplex and lastly signifying that the connections been accepted and receiving all the texture memory reading thanks for watching if you wanna. See some of my sources check the description good day ” .
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