That's right, after patting my head for a long time, how can there be no radio experts in the place where the radar is made, and I still think hard about these technical problems.

"Say, if you have any questions to ask, I will personally counsel you. The old director said triumphantly.

In the end, there is a specialization in the art industry, and the carrier problem that has been troubled for a long time has been easily solved by the old director, and it is easy to understand according to the old director's words.

Ordinary telephone lines transmit analog sound signals, and in order for two computers to be connected by telephone lines, the data must be converted into sound, which requires the use of modems.

Whether it is an analog signal or a digital signal we emit, it is low-frequency, the professional term is called baseband signal, and some of the disadvantages of this thing are that it occupies a lot of bandwidth resources, and one person can only watch it when it is used, and it cannot be transmitted over long distances.

In order to solve this problem, it is common practice to use a modem (as the saying goes, cats) to convert low-frequency baseband signals into high-frequency signals, which is especially suitable for the transmission of digital signals.

To put it bluntly, modulation and demodulation is to compress and transmit the signal, anyway, that's how the old director understands it, and the five bodies that have been thrown to the ground for a long time are still old and spicy.

The old director figured out the key to it, and immediately drew the structure of the modem on paper, and refined it step by step, until the various parts came out, and it took more than four hours in total, until he was stunned for a long time, and he couldn't make a sound.

It turns out that the legendary cow man does exist, I thought to myself for a long time.

Bill Joe, the author of BSD, claimed to have developed a UNIX operating system in three days, and he could write BSD's network code by listening to others read the TCP/IP protocol.

Now that I have seen the performance of the old director, the shock in my heart can be imagined, and it has been an eye-opener for a long time.

In the end, the old director finally put down the pen with satisfaction, as if he had completed a Chinese painting, and clapped his hands and said: "It's done, you see how this is, there is probably nothing wrong with it, just make a sample and try it." ”

After looking at it for a long time, I didn't find anything wrong, so I gave a thumbs up and praised: "You are so old, you can ...... in such a short time That's where the effort comes in. ”

"Haha, it's average, I'm old, and my brain isn't as good as it used to be. The old director's face flushed red, obviously very useful for long-term sycophants, "Happy today, let's have a drink." ”

After looking at it for a long time, I always felt that something was wrong, but I couldn't say it, and the time was not early, so I put my mind at ease and went to eat.

Due to the urgency of time, basically everyone works overtime in the night office, of course, there is no overtime pay, everyone is voluntary.

The genius pen designed by the old director himself was also quickly made into a model, with a huge volume and a large number of integrated circuits, which reminded me of the cabinet for a long time.

Although it doesn't look good, it's okay to make it, and it actually passed by connecting it with a telephone line.

The test was conducted on the 0521 microcomputer, which had been developed for a long time, and was connected to the modem using a parallel port on the motherboard.

I changed my operating system overnight, wrote drivers for the modem, and wrote them very freely, as if I had returned to the past, and the voice of God sounded in my ears - "If you are a man, you have to write your own driver", which is a good feeling.

The long-term efficiency of the rampage is extremely high, and the program is completed in one night, and the model is tested together.

The old director and a group of people all stood behind and watched, and there seemed to be some in military uniforms, but he didn't pay attention for a long time, because his attention was all on the machine.

After starting the connection program for a long time, I began to wait anxiously, and time seemed to slow down all of a sudden, making people breathless.

The modem didn't emit a screeching dial tone, because it wasn't a phone after all, and it was only designed as a network connector for a long time.

After waiting for a while, a signal finally appeared on the screen that the connection was successful, and he logged in to another computer smoothly for a long time, and he let go and breathed a sigh of relief.

Everyone seemed to have seen it for a long time, and they all came closer to watch, but they couldn't understand anything, and they were too embarrassed to disturb, and they were so anxious that their hearts itched.

The old director was still angry, and asked directly: "What's the matter, have you succeeded?" ”

"I don't know, it's just just connected now, and I still have to do some testing. ”

"Oh. The old director said happily, "That's not a big problem, it's good." ”

As soon as everyone heard the old director's comments, they all said "oh", and their hearts were settled, and the old director said that there was no big problem, so there would be no big problem.

I ran a test program for a long time and tested the packet drop rate, which is not bad, at least the packet drop rate of this 5-meter line is less than 1%, and the data is okay.

One test program after another was run, and basically no problems were found, and the following is a long stability test.

So he stood up for a long time and announced: "As long as there is no problem after 24 hours, it will be considered a success." ”

Hearing this, everyone couldn't help but let out a burst of cheers. The old director also exhaled, patted Changjiu's shoulder and said, "You are also tired these days, go and rest first, here we are watching." ”

Chang smiled bitterly: "It's just that the connection between the two machines is successful, what is there to be happy about, if more than a dozen machines ......"

After talking about this for a long time, I suddenly realized in my heart, and finally knew why I always felt wrong these days, it turned out to be this.

The transmission between the two machines is relatively simple, and the LAN standards are similar, but the key is that the problem of interconnection between multiple machines is difficult to solve, which has led to a variety of standards.

This involves the topology of network design, the early network is the use of bus structure, that is, a line to the end, as long as a user's line is broken the entire network will stop B, the fault location is particularly difficult to check, so the network is still very underdeveloped before 83 years.

The situation was not improved until AT&T proposed a new structure.

AT&T, which specializes in telephony, proposed that the LAN use a star structure similar to telephone wiring, where each user uses a separate line to interconnect with a central hub and communicate with other computers through the hub.

This is a significant improvement that is easy to install, configure, manage, and troubleshoot at a lower cost. As a result, structured cabling was born, which immediately captured the entire market and the bus LAN disappeared.

In that regard, there is no need to use a bus structure for a long time, and there is no need to use technology that is bound to be outdated, but if you use a star structure, you need to design a hub.

After thinking about it for a long time, I told the old director what I thought, hoping to get some help from him.

The old director didn't take this seriously, just smiled and said: "This is no problem, good boy, you go to rest first, let's find a way to solve it ourselves, there is no big problem, isn't it just a machine to send a signal to the hub you said, and then the hub is forwarded to other computers." ”

The old director thought for a while: "What kind of hub do you want, just change the 0521 microcomputer and use it as a transponder." Hehe, you kid always complicate things. ”

After hearing this for a long time, I only felt that my eyes suddenly brightened, and I secretly scolded that I was a pig, why was I so stupid, just thinking about how to use special equipment to solve it, but I didn't expect the old director to KO with a word.

It seems that there are also software in memory to achieve various network functions, but it is a server host, but I change my thinking, and I feel as if my brain is also ossified for a long time, and the wisdom of working people is infinite.

Looking at the face of the old director for a long time, I couldn't help but feel very cute, and I couldn't wait to pounce on it and kiss it, so talented, which is a hub, this is the idea of the switch.

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