1695: C1695 ADSL

C1695 ADSL

In the future, a lot of people would complain that when playing games, the internet card wouldn't move, and then they would lose, but if they went back 20 years and looked at the internet of this era, they would feel at ease.

Needless to say, it was just a picture and they needed to wait patiently. They could go out and eat. When they came back, the picture would probably appear.

At the same time, the picture was also quite terrible. It was because the highly compressed picture was very distorted when it was restored.

If it was a highly guaranteed picture, a picture could easily be several trillion. How long would it take to transmit it with a dozen K cat? A few minutes, and this was only theoretical speed, everyone should know. It was known as a 100 trillion broadband, but having the highest speed of 10 trillion was already considered not bad. It was also known as 14. A 4K cat with a 1K speed was already considered not bad. That would take dozens of minutes to transmit a photo. As for the video? You can accept a palm-sized window, and then the picture on it... Move for an hour? Can this be called a video?

There was no need to consider Ren Gong. Ren Gong was not omnipotent. Although he was working on a mobile communication machine, the current mobile communication machine was also in the 2G era.

If one were to use an image to describe it, in the 2G era, he could only look at the empty TXT, which was the text file, in the 3G era. Only then could one look at the empty sky. JPEJ, which was also a picture, could only look at the empty sky in the 4G era. AVI, it was a video.

The equipment in Ren Gong's hands was for the mobile communication system. At the same time, it could also be used to modify the current phone network, such as the programming exchange machine. In short, it was all 2G era's equipment that could only be used to exchange text and data.

Therefore, the chatroom in this era was very popular because everyone could only send text.

(Hua Xiong also missed that era. That era when online literature was involved was the golden era. Now, the Fast Hands Studio had already far exceeded that of online literature.)

If Qin Guan wanted to make videos, it would definitely be a huge leap.

Qin Guan knew that he had made a big joke. 14. 4K cats had always been developing, but their technology was quite slow. It was only in the 1990s that the 56K cat system was gradually developed. It was also not very stable and often disconnected.

What about now?

They were very advanced in computer technology, and they had also started to develop in cybertechnology. There were already operators in China who started to develop this kind of personal network, and the fees were quite high. It was definitely more expensive than mobile phones, and could only be owned by rich people who had just become wealthy.

Then, if he wanted to make a video call with his family, would he not be able to do it?

Of course not. Now, this meant that a major breakthrough in Internet technology was about to happen. This was the broadband cat.

The telephone line was still the same one, but the transmission speed had increased by a hundred times. It directly surpassed the level of a trillion. It was definitely not a problem to make a video call and watch a movie online!

Now, it was only the army that would set up fiber-optic lines on a large scale. As for the civil side, it was still not possible to set up the optical fibers, and it was even more impossible for the optical fibers to enter the account. After all, it required a huge investment in infrastructure, and the domestic telecom industry could not afford it. There were not enough users, and only large companies could access one. As for those small companies, those bosses would definitely be more willing to take a big mobile phone. When they were discussing business, they would put it on display.

"Looks like the development of the computer network still can't be separated from our Han Chip Technology Company." Qin Guan had a smile on his face, but the awkwardness just now had changed. Everyone knew that Qin Guan already had a plan.

"President Qin, are you going to introduce us to a new technology?" Many people gathered around him. They were all familiar faces. For example, the one who begged Xiaojun was now a more mature man.

"Everyone, why is the internet speed so slow now?" Qin Guan finally started to act as the technical king in front of these technical experts. This feeling was floating in the air.

"Because our data is a high-frequency signal, but the telephone line can only transmit low-frequency signals. This way, during the transmission process, the speed can't be increased." Someone immediately responded.

That's right, this was a weakness of ordinary cats. When it was transmitted through the line, it's using an audio signal, the speed of this signal, it can't be high, and it's a simulated signal... So there would be a lot of problems, such as losing the signal and so on. "So, if we want to increase the transmission speed by a large margin, we need to change all of this." Qin Guan said, "I'm here to only provide ideas and realizations. It depends on everyone. "

"President Qin, please speak." As Worker Ni spoke, he took out his notebook and started to record seriously.

"Our telephone lines are twin-winded. This type of telephone line can not only transmit low-frequency frequencies. It can also transmit frequencies higher than 4KHZ. We might as well split the transmission signals of the telephone lines into many frequencies. For example, between 4KHZ and 1.1MHZ, in such a large and wide frequency band, we divide the band into 256 frequencies, which are 4.3125kHZ subband, with a width of 4.3125kHZ. "

The ones on top can also be used. The higher you go, the faster you will be able to use them.

" This way, the previous telephone lines won't have to be abandoned. They can be used to carry more signals. The band below 4KHZ will still be used in the traditional phone business. The other band channels will also be used. Then we can use it to transmit digital signals." Qin Guan said, "Making phone calls and surfing the internet, they don't affect each other. We do our own things. However, we'd better separate the frequencies at the back. "

Qin Guan was quite familiar with ATSL. In Parallel Spacetime, when his home had the internet, he had used this kind of ATSL cat in the first place.

"For example, we use the 138KHZ as the dividing line. The frequency band between 20KHZ and 138KHZ is used to transmit upside-down signals. The frequency band between 138KHZ and 1.1MHZ is used to transmit downward signals."

"Isn't that too much?" someone suddenly asked.

"That's right. Think about it, when personal users go online, do they download a lot or upload a lot?" Qin Guan asked back.

The full name of ATSL was the nonsymmetrical number of user circuits. The download line and upload line were different. After all, most users mainly download. Wouldn't it be better for them to download more smoothly?1

According to the technical data, even if it was the original ATSL technology, it could already reach a very high data transmission rate.

640 kbps from the top and 8MBPs from the bottom. This way, there wouldn't be any delays in watching the movie. At the same time, although the upstream seemed to be very low, compared to the normal 14. For a normal 4KB cat, the speed was also increased by 40 times. Opening a video call was definitely not a problem!

"Our plan is to achieve 8M downstream, 640 KB upload data transmission channel." Qin Guan said, "Is everyone confident?"

After he said that, the scene was dead silent.

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