The Science Fiction World of Xueba

In the next two days, Pang Xuelin stayed at Fatty Liu's house, and began to write technical materials based on the relevant papers he had read about Huawei's C\u0026C08 program-controlled switches in the real world.

Two days later, Pang Xuelin took more than ten pages of manuscript paper, left the house with Fatty Liu, Mu Donglai and his daughter, and went straight to the Shenyi Industrial Building in Nanyou Industrial Park.

Warwick is the only building in this building.

As soon as he arrived at the gate of Huawei, a tall man with thick eyebrows and big eyes came out. Pang Xuelin's eyes lit up, and he stopped him: "Hello, is Mr. Ren here?"

The man looked Pang Xuelin up and down, and said, "You are..."

Pang Xuelin pointed to Mu Donglai and said, "This is Professor Mu Donglai from Chang'an Jiaotong University. We are more interested in your company's program-controlled switches. We have a project and hope to have a good chat with Mr. Ren."

The man's eyes lit up, and he suddenly smiled and said, "Come in, Mr. Ren is in the company, and I'll take you to find him."

Today's Warwick is in a state of tight capital chain, and Warwick welcomes any customer who can bring funds to Warwick.

Pang Xuelin nodded with a smile.

Mu Donglai said softly, "Xiao Pang, you know him."

Pang Xuelin smiled and said: "He should be Xu Wenwei. Ren Zhengfei was dug over from Elite. He is one of the main technical leaders of Huawei. Developed."

Pang Xuelin didn't deliberately lower his voice. Xu Wenwei, who was leading the way, couldn't help looking back at Pang Xuelin, but he didn't make a sound.

Pang Xuelin was also observing Huawei's office environment while walking.

Huawei's office is not big, and it is a bit like the Internet companies of later generations. Computers are densely distributed in various workstations, and most people are busy with their own affairs.

Soon, everyone arrived at the door of Ren Zhengfei's office.

Xu Wenwei knocked on the door, and soon, a clear voice came from inside.

"Come in!"

Xu Wenwei pushed the door open and said, "Mr. Ren, there is a customer visiting, who is said to be a professor from Chang'an Jiaotong University."

"Get them in!"

soon,

Pang Xuelin, Mu Donglai, Liu Qi, and Mu Qingqing walked in, and saw a much younger and familiar face behind the desk.

In the real world, because of the Sino-US trade war, Ren Zhengfei, who has always kept a low profile in the media, had to stand up for Huawei.

At the same time, it also shows the demeanor of China's top entrepreneurs to the world.

Pang Xuelin and the real Ren Zhengfei met only once, and that was at the establishment reception of Golden Dragon Group. Ren Zhengfei came over to offer a toast to Pang Xuelin, hoping that Warwick could cooperate with Qiantang Lab in the field of carbon-based chips.

The two lost contact after that.

Now in China Sun World, facing the 49-year-old Ren Zhengfei, the two are destined to have more intersections in the coming time.

Ren Zhengfei got up from the office chair, went straight to Mu Donglai and smiled, "Hello, hello, I'm Ren Zhengfei, may I ask who you are?"

Mu Donglai smiled and said: "Mr. Ren, hello, I am Mu Donglai from Chang'an Jiaotong University, but this time there is someone else who wants to cooperate with you, I am just accompanying you."

"Accompaniment?"

Ren Zhengfei was taken aback for a moment, then turned his gaze to Fatty Liu.

Among the four people who came over, Pang Xuelin and Mu Qingqing had young looks. Although they had good looks, they were automatically ignored by Ren Zhengfei.

On the contrary, Fatty Liu, who has been in the jade business, has more businessman temperament.

Fatty Liu pointed at Pang Xuelin, and said with a smile, "Mr. Ren, don't look at me. I'm also an escort. The one who really wants to cooperate with you is my brother Pang."

Ren Zhengfei turned his gaze to Pang Xuelin, with a look of surprise on his face. Whether it was Mu Donglai or the fat man in front of him, it could be seen from their clothes and temperament that the other party was not an ordinary person.

But he never expected that these two people would just accompany the young man in front of him.

Even Xu Wenwei, who was standing aside, had a hint of surprise on his face.

Pang Xuelin smiled and said: "Mr. Ren, hello, I'm Pang Xuelin from Lancheng University, nice to meet you!"

"Brother Pang, what kind of cooperation do you want?"

Ren Zhengfei quickly restrained his surprised expression and said with a smile.

Pang Xuelin smiled slightly and said, "Mr. Ren, let's sit down and talk."

"Oh, look at my brain, please sit down, please sit down."

Soon, everyone sat down in the reception area of ​​Ren Zhengfei's office, and Xu Wenwei, who was at the side, took up the work of a secretary, serving tea and water for everyone, and finally, he also sat down beside Ren Zhengfei.

Obviously, at this time, Xu Wenwei is already equivalent to Ren Zhengfei's right-hand man, and can be regarded as one of Huawei's internal executives.

"Brother Pang, can you tell me now which product you are interested in?"

Pang Xuelin laughed and said, "Mr. Ren, I am more interested in the C\u0026C08 program-controlled switch you are developing."

Ren Zhengfei was taken aback for a moment, and immediately expressed embarrassment: "Brother Pang, if you come to Huawei to seek cooperation with us on your own initiative today, then I won't talk nonsense with you. Our program-controlled switch is still under development. Some orders have been placed, but the specific delivery time cannot be determined, I guess it will have to wait until next year at the earliest!"

Pang Xuelin shook his head with a smile, and said, "Mr. Ren, the cooperation I'm talking about doesn't mean buying your switches."

"why?"

Pang Xuelin took out his results of the last two days from the folder he carried with him, handed them to Xu Wenwei, and said with a smile: "Mr. Ren, you don't understand technology. Let Mr. Xu appraise this information."

When Xu Wenwei saw the dozen or so bound A4 papers, he couldn't help being slightly taken aback when he saw the words on them.

"Design scheme of two thousand program-controlled switches and software algorithm design of ten thousand switches"

Xu Wenwei is one of the leading figures in Huawei's early research and development.

In 1991, Ren Zhengfei was shifting the company's business from agency switches to R\u0026D switches. In the process of R\u0026D, Huawei found that if the general-purpose chips used by everyone were used, the products would fall into the ocean of price wars.

If you want to get rid of your competitors, you can only develop your own chips.

At that time, Huawei was developing the user switch HJD48 (analog switch), and Zheng Baoyong, Huawei's "No. 2 Chief", was in charge of the development of the entire system. After Xu Wenwei came, he established a device room, engaged in printed circuit board (PCB) design and chip design.

The chip developed by Xu Wenwei is an ASIC chip for switches.

During the research and development process, Xu Wenwei first designed his own circuit on the PAL16 programmable device, and then conducted actual verification. After passing the verification, he entrusted Xiangjiang company to design an ASIC chip, and then handed it over to Texas Instruments for tape-out production.

This cost is expensive, and the one-time project cost will be tens of thousands of dollars.

In the early 1990s, there were foreign exchange controls, and foreign exchange quotas were very scarce.

At that time, it can be said that Ren Zhengfei really gritted his teeth and supported Xu Wenwei's research and development.

This is a very complicated process, and it is not easy and successful for many experienced semiconductor design talents to design on programmable circuits.

But Xu Wenwei's level is really not covered. The process with a low success rate was a one-time success. It took less than a year for Xu Wenwei to come to Huawei, and Huawei has its own chip, which will be used for the next C\u0026C08 program control. The research and development of the switch laid the foundation.

Even so, in the past year or so, the C\u0026C08 program-controlled switchboard has encountered many problems, and the delivery time originally agreed with Yiwu in May this year had to be delayed until October.

It has now entered June, and there are still many problems that have not been solved for C\u0026C08 program-controlled switches.

During this time, Ren Zhengfei's hair turned gray.

In history, it was the joining of another genius that brought Warwick's C\u0026C08 program-controlled switchboard project back to life.

This is Li Yinan.

Li Yinan, born in Hunan in 1970, was admitted to the junior class of Huazhong University of Science and Technology at the age of 15.

In June 1993, Li Yinan joined Warwick after graduating with a master's degree. He was promoted to Huawei engineer in two days, chief engineer in half a month, deputy general manager of the Central Research Department in half a year, and chief engineer/central research in two years. At the age of 27, he became the vice president of Warwick Corporation.

It is this talented young man who has made Warwick's C\u0026C08 project.

In the next few years, Huawei continued to improve on the basis of the C\u0026C08 program-controlled switch, and then developed the Wanmen program-controlled switch based on it again, and sold this series of products all over the world, bringing Huawei a revenue of hundreds of billions of RMB. , which became the cornerstone of Warwick's rise in the first stage.

But now, Li Yinan hasn't come yet.

Pang Xuelin was able to make a time difference and hand over the design of the complete version of the C\u0026C08 program-controlled switch to Ren Zhengfei.

The office fell silent, only the sound of Xu Wenwei turning pages.

The more he looked, the more dignified the expression on Xu Wenwei's face became.

From being careless at the beginning, then gradually becoming shocked, and then completely dignified.

After about half an hour, Xu Wenwei took a deep breath and put the document in hand on the coffee table.

"Xiao Xu, how are you doing?"

Xu Wenwei said: "Brother Pang, who designed this technical document?"

Xu Wenwei didn't believe that this was the work of Pang Xuelin. The design was so mature and the design concept was ingenious.

Only those big cows who work for top communication companies such as Alcatel and Ericsson can design such excellent products.

Pang Xuelin smiled slightly, pointed to himself and said, "It's far away in the sky, but it's close in front of us."

"You mean yourself?"

Xu Wenwei showed disbelief on his face.

Even Ren Zhengfei was shocked.

Just now when Xu Wenwei asked Pang Xuelin who wrote this document, Ren Zhengfei realized that this technical document was unusual.

But he never expected that this information was written by the young man who looked like a high school student in front of him.

Pang Xuelin smiled and said, "Why, don't you believe me?"

Xu Wenwei said: "Brother Pang, may I ask which university did you graduate from?"

Pang Xuelin laughed and said, "To be exact, I haven't formally entered university yet, but my master is Chen Wenyuan, a professor in the Mathematics Department of Lanzhou University, and my second master is Xu Baiqing, the principal of Lanzhou University..."

Xu Wenwei and Ren Zhengfei couldn't help but looked at each other, not knowing whether what Pang Xuelin said was true or not.

At this time, Mu Donglai laughed, took out a work card from his arms, and said with a smile: "Mr. Ren, Mr. Xu, this is my work card from Chang'an Jiaotong University. If you don't believe me, you can call my school to verify it." Now, I can prove what Xiao Pang said."

At this moment, Mu Qingqing and Fatty Liu also said, "We can also prove it."

Mu Qingqing immediately added: "Mr. Ren, Brother Pang is amazing. He even invented a brand new audio-visual player CVD some time ago. The price is much cheaper than the LD laser player on the market. Ordinary CDs can Play, the reason why Pang Pang asked you Huawei to cooperate, on the one hand, is because he knows that you have encountered difficulties in the research and development of program-controlled switches, and on the other hand, he also hopes to cooperate with you to obtain original funds for the production of CVD."

Xu Wenwei and Ren Zhengfei looked at each other, Xu Wenwei smiled wryly and said, "Brother Pang, it's not that we don't believe it, this... this is really unbelievable."

After pondering for a moment, Xu Wenwei said: "Brother Pang, since you said you designed this, can you tell me about your design philosophy?"

Pang Xuelin laughed and said, "Okay, then I'll start with the principle of program-controlled switches."

"An important application of program-controlled digital switches is communication systems, which are generally used in dispatch centers and communication stations at all levels in communication systems. The hardware of program-controlled switching systems can be divided into two systems: voice system and central control system. Voice channel The system is composed of switching network and peripheral circuits. The peripheral circuits include user circuits, repeaters, scanners, network drivers and voice channel equipment interfaces. The functions of the central control system include two aspects: one is to call On the other hand, it manages, monitors and maintains the daily operation of the entire switch.”

"Next, let's start with the basic principle of the user module. The user module is the interface between the user's telephone set and the switching network in the digital program-controlled switching system. Its functions can be summarized into seven functions of BORSCHT, specifically: B (Battery feeding) Feed; O (Overvoltage) overvoltage protection; R (Ringing control) ringing control; S () monitoring; C (CODEC\u0026filters) coding and filtering; H (Hybrid circuit) 2-4 wire hybrid circuit; T (Test) test."

"In digital telephone communication, people's voice is an analog signal, so the analog signal must be converted into a digital signal by A/D conversion at the sending end and then sent to the transmission device, and then the digital signal is converted by D/A conversion at the receiving end. The signal is restored to an analog signal. Digital signals can be generated using a variety of modulation methods. Commonly used is pulse code modulation, namely PCM (Pulse Code).

"Time-division multiplexing is a way of transmitting the pulse sequences of several discrete signals in one channel, through grouping, compression, and cyclic sorting, into multiple signals that do not overlap each other in time. Time-division communication is also called Time-division communication is the main method of digital telephone multiplex communication, so PCM communication is often called time-division multiplex communication."

"From the process of converting the voice analog signal into a digital signal, in order to ensure that the receiving end can restore the discrete digital signal to a continuous analog signal, the sampling frequency needs to be 8000 Hz, that is, sampling once every 125 microseconds. A period of time, this period of time is called a time slot. The more the number of channels, the smaller the time slot of each channel. Our country adopts the PCM30/32 system recommended by CCITT as the primary group of the standardized time division multiplex transmission system."

"The task of the telephone switching system is to establish a temporary channel (connection) for voice signals between various subscriber lines, between subscriber lines and trunk lines, or between trunk lines and trunk lines. This work is finally completed by the switching network. In the current In the program-controlled switching system, the switching network can be divided into two types: space-division switching network and time-division switching network.

...

Pang Xuelin's tone was unhurried, and he explained the principle of the program-controlled switch. After explaining the principle, he continued: "This is the basic principle of the program-controlled switch. Next, I will explain my design plan based on the basic principle."

"The program-controlled switch I designed mainly includes a central management/communication module (AM/CM), a service processing module (SPM), a shared resource module (SRM), and is physically integrated with the AM/CM. "

"The central switching network () completes the service switching function, and its capacity can be superimposed and configured in units of 16k×16k time slots according to the actual situation, up to 128k×128k time slot switching. The service line interface module (LIM) mainly completes business data and Composite/decomposition of communication signaling data and system transmission line drive interface function, so that AM/CM can be connected with various network equipment. LIM also provides voice channel and signaling between service processing module (SPM) and shared resource module (SRM) interface, so that the service processing module (SPM) and the shared resource module (SRM) can be embedded in the AM/CM. The back management module (BAM) completes the operation and maintenance of the AM/CM and the connected users and the fault centralized alarm, and has Data management, providing network interfaces for terminals, realizing remote/centralized maintenance functions..."

"The synchronous timing module (CKM) ensures that the system is synchronized with the upper-level network, and provides the synchronous timing reference used by each module in the system. The central processing module (CPM) completes the storage and processing of the system's global data, and is responsible for the AM/CM. The board is managed. The service processing module (SPM) completes the processing of signaling and services. The shared resource module (SRM) provides various necessary resources required for service processing, including signal tones, dual-tone receivers, and multi-frequency mutual control transceivers device, caller ID display, conference phone, etc..."

Time passed by every minute and every second, and before I knew it, more than two hours had passed.

Xu Wenwei nodded frequently while listening, and wrote down some of what Pang Xuelin said with a pen from time to time.

The expression on Ren Zhengfei's face also changed from being shocked at the beginning, to gradually becoming appreciative, and finally, his face was already full of smiles.

Liu Qi and Mu Donglai couldn't understand at all, Liu Qi yawned from time to time, everything Pang Xuelin said was like a heavenly book to him.

Mu Donglai was interested in it. Although he didn't understand much, he could tell from the expressions on the faces of Ren Zhengfei and Xu Wenwei that Pang Xuelin was conquering each other step by step, just like he conquered himself and Fatty Liu back then.

On the other hand, Mu Qingqing stared at Pang Xuelin without blinking her chin.

His eyes slowly filled with admiration and admiration.

In her eyes, Pang Xuelin at this time is the most handsome.

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