Super Weapon Swap System

In future generations, many people will complain that when playing games, the network speed card doesn't move, and they lose. However, if they go back 20 years and look at the network of this era, they should be at ease.

Needless to say, the game is just a picture. You need to wait patiently. You can go out for dinner. When you come back, it is estimated that the picture will come out.

At the same time, the picture is also quite bad, because highly compressed pictures have great distortion when restored.

If it is a highly guaranteed picture, a picture is often a few megabytes. How long does it take to transmit it with a cat of more than ten K? For several minutes, this is only the theoretical speed. Everyone should know that for the so-called 100 megabit broadband, it's good to have a maximum speed of 10 megabits. For the so-called 14.4k cat, it's good to have a speed of 1K. It takes dozens of minutes to transmit a photo. As for video? Can you accept a palm sized window and move the picture on it for an hour? Can this be called a video?

There's no need to consider employment. Employment is not omnipotent. Although he is engaged in mobile communication switches, now, mobile communication switches are also in the 2G era.

If you use an image metaphor, in the 2G era, you can only see the sky. TXT, that is, text files. In the 3G era, you can see the sky. JPEJ, that is, pictures. In 4G, you can see the sky. Avi, that is, video.

The equipment in the hands of Ren Gong is supplied to the mobile communication system. At the same time, it can also be used to transform the current telephone network, such as program-controlled exchange. In short, it is only able to exchange text data in the 2G era.

Therefore, chat rooms in this era are very popular, because everyone can only send text.

(Kwai hung tiktok also missed that era. In that era, Internet literature was the golden age. Now, the fast hand shaking has gone far beyond the Internet literature.)

Qin Guan wants to make videos. That's definitely the great leap forward.

Qin Guan knew that he had made a big joke. The 14.4k cat has been developing all the time, but the technology is quite slow. It was not until the 1990s that he gradually developed the 56K CAT system. It is not very stable and often disconnected.

And now?

We are very developed in computer technology and have begun to make great strides in network technology. Domestic operators have begun to engage in this kind of personal network. The charge is quite high. It is definitely more expensive than mobile phones, which can be owned by rich people who have just become rich.

So, if you want to have a video call with your family, can't you?

Of course not. Now, in this case, it also means that our major breakthrough in network technology is coming. This is broadband cat.

The telephone line is still that telephone line. However, the transmission speed has increased by hundreds of times, and it has directly stepped into the megabyte level. It is absolutely no problem to use it for video calls and online movies!

Now, laying optical fibers on a large scale is something the army will do. In terms of civil use, it is still impossible to lay optical fiber, and it is even more impossible to enter the home. After all, this requires huge investment in infrastructure, but the domestic telecommunications industry still can't afford it. There are not enough users. Only large enterprises can access one. As for various small enterprises, those bosses must be more willing to take a large mobile phone, Deliberately put it out when talking about business.

"It seems that the development of computer network is still inseparable from our Hanshin technology company." Qin Guan smiled and changed from the embarrassment just now. Everyone knows that Qin Guan has a plan now.

"Mr. Qin, are you going to introduce new black technology to us?" many people gathered around. Familiar faces, such as Qiu Xiaojun, now look more mature and have become a mature man.

"People say that the Internet speed is slow now. What's the reason?" Qin Guan finally began to act as the technology emperor in front of this group of technical experts. This feeling is floating.

"Because our data is a high-frequency signal, but the telephone line can only transmit low-frequency signals, so it is impossible to improve the speed in the process of transmission." someone immediately responded.

Yes, this is a weakness of ordinary cats. When they transmit on the line, they still use audio signals. The rate of this signal can't be high. Moreover, it is still analog signals, so there will be many problems, such as signal loss and so on. "Therefore, if we want to greatly improve the transmission speed, we need to change all this." Qin Guan said: "here, I only provide ideas, and the specific implementation depends on everyone."

"Mr. Qin, please speak." as Ni Gong said, he began to take out his notebook and record it carefully.

"Our telephone line is twisted pair. This kind of telephone line can not only transmit low frequency, that is, the frequency band below 4kHz, but also transmit higher frequency. We simply divide the transmission signal of the telephone line into many frequency bands. For example, from 4kHz to 1.1mhz, such a huge and wide frequency band is divided into 256 subbands with a bandwidth of 4.3125khz."

The above can also be used. The higher you go, the faster it will be.

"In this way, the previous telephone lines do not have to be abandoned and can carry more signals. The frequency bands below 4kHz are still used for traditional telephone services, and other frequency bands can be used to transmit digital signals." Qin Guan said: "making phone calls and surfing the Internet do not affect each other. However, we'd better distinguish the latter frequency bands."

Qin Guan is quite familiar with ADSL. In that parallel time and space, when his home had a network, he initially used this kind of Telecom ADSL cat.

"For example, we take 138khz as the dividing line. The frequency band from 20kHz to 138khz is used to transmit uplink signals, and the frequency band from 138khz to 1.1mhz is used to transmit downlink signals."

"It's too much for this down line?" someone asked immediately.

"Yes, let's think about it. When individual users surf the Internet, do they download more or upload more?" Qin Guan asked.

ADSL, the full name is asymmetric digital subscriber line. Downlink and uplink are different. After all, most users mainly download, so that they can download more smoothly. Isn't that better?

According to the technical data, even the initial ADSL technology can reach a very high data transmission rate.

Uplink 640kbps and downlink 8mbps. In this way, there will be no delay in watching movies. At the same time, although the uplink looks very low, compared with the ordinary 14.4kb cat, the speed has also increased by 40 times. It is absolutely no problem to open a video call!

"Our plan is to realize the downlink 8m and uplink 640kb data transmission channels." Qin Guan said, "do you have confidence?"

With that, the scene was silent.