In the next two days, Pang Xuelin stayed at Liu Fatzi's house and began to write technical materials based on the relevant papers he had read in the real world about Huawei C&C08 program-controlled switches.

Two days later, Pang Xuelin took more than a dozen pages of manuscript paper, went out of the house with Liu Fatzi and Mu Donglai's father and daughter, and went straight to the Shenyi Industrial Building in Nanyou Industrial Park.

Warwick is the only one in this building.

As soon as he came to the door of Warwick, a tall man with thick eyebrows and big eyes walked out of it, Pang Xuelin's eyes lit up, and he stopped the other party: "Hello, may I ask if you are Mr. Ren?" ”

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 of Chang'an Jiaotong University, we are more interested in your company's program-controlled switch, and we hope to have a good chat with Mr. Ren on a project." ”

The man's eyes lit up, and a smile suddenly appeared: "Please come in, Mr. Ren is in the company, and I will take you to him." ”

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

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 dug it from Yilida, and is one of the main persons in charge of Huawei technology, and the first ASIC chip designed by Huawei with his own EDA came out, which was developed by him." ”

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

As Pang Xuelin walked, he was also observing Warwick's office environment.

Warwick's office is not big, and it is a bit like the Internet companies of later generations, with computers densely distributed in various workstations, and most people are buried in their own business.

Soon, everyone came to the door of Ren Zhengfei's office.

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

"Please come in!"

Xu Wenwei pushed the door in and said, "Mr. Ren, a customer has come to visit, saying that it is a professor from Chang'an Jiaotong University. ”

"Invite them in!"

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

In the real world, because of the Sino-US trade war, Ren Zhengfei, who has always been low-key in the media, had to stand up for Warwick.

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

Pang Xuelin and Ren Zhengfei in reality have only met once, that is, at the cocktail party established by Jinlong Group, Ren Zhengfei came over to toast Pang Xuelin with a glass of wine, hoping that Huawei Company can cooperate with Qiantang Laboratory in the field of carbon-based chips.

Since then, the two have had little contact.

Now in China's Sun World, facing Ren Zhengfei, who is only forty-nine years old, the two are destined to have more intersections in the next time.

Ren Zhengfei got up from the office chair, walked straight to Mu Donglai and said with a smile: "Hello, hello, I'm Ren Zhengfei, may I ask who you are?" ”

Mu Donglai said with a smile: "Mr. Ren, hello, I am Mu Donglai from Chang'an Jiaotong University, but there are other people who want to cooperate with you this time, I am just accompanying guests." ”

"Escort?"

Ren Zhengfei was slightly stunned and turned his gaze to Liu Fatzi.

Among the four people who came over, Pang Xuelin and Mu Qingqing looked young, although they were very good-looking, they were automatically ignored by Ren Zhengfei.

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

Liu Fatzi pointed at Pang Xuelin and said with a smile: "Mr. Ren, don't look at me, I am also a guest, and it is my brother Pang who really wants to cooperate with you." ”

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

But he never thought that these two people were only accompanying the young man in front of him.

Even Xu Wenwei, who was standing on the side, showed a hint of surprise on his face.

Pang Xuelin smiled and said: "Mr. Ren, hello, I am Pang Xuelin from Lancheng University, I am very happy to meet you!" ”

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

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

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

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

Soon, everyone sat down in the reception area of Ren Zhengfei's office, and Xu Wenwei on the side did the work of a secretary, helping everyone serve tea and water, and finally, he also sat down next to Ren Zhengfei.

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

"Brother Pang, now I can tell me, which of our products are you interested in, right?"

Pang Xuelin laughed and said, "Mr. Ren, I am more interested in the C&C08 program-controlled switch you are developing. ”

Ren Zhengfei was slightly stunned, and suddenly said with an embarrassed face: "Brother Pang, today you can take the initiative to come to Huawei to find us to cooperate, then I won't talk nonsense with you, our program-controlled switch is still under development, although there are already some orders, but the specific delivery time is not determined, I estimate that we 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 am talking about is not to buy your switch. ”

"Why is that?"

Pang Xuelin took out his achievements in the last two days from the folder he carried, handed them to Xu Wenwei on the side, and said with a smile: "Mr. Ren, you don't understand technology, let Mr. Xu identify this information." ”

Xu Wenwei turned out the dozen or so bound A4 papers, and when he saw the text on them, he couldn't help but be slightly stunned.

Design Scheme of 2,000-door Program-controlled Switch and Software Algorithm Design of 10,000-door Switch

Xu Wenwei is one of the leaders of Warwick's early research and development.

In 1991, Ren Zhengfei was shifting the company's switch from a proxy switch to a R&D switch, and in the process of research and development, Huawei found that if the general-purpose chip used by everyone was used, the product would fall into a sea 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, the "second leader" of Warwick, was responsible for the development of the entire system. After Xu Wenwei came, he established a device room and engaged in printed circuit board (PCB) design and chip design.

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

In the R&D process, Xu Wenwei first designed his own circuit on the PAL16 programmable device, and then carried out actual verification, and then commissioned the company in Heung Kong to design the ASIC chip, and then handed it over to Texas Instruments for tape-out production.

This is a lot of money, and the one-time project cost is tens of thousands of dollars.

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

At that time, Ren Zhengfei could be said to have really gritted his teeth and supported Xu Wenwei in research and development.

This is a very complex process, and designing on programmable circuits is not something that can be achieved simply for many experienced semiconductor designers.

But Xu Wenwei's level is really not covered, the original success rate is not high, the process is directly a success, Xu Wenwei came to Huawei in less than a year, so that Huawei has its own chip, for the next C&C08 program-controlled switch research and development laid the foundation.

Nevertheless, in the past year or so, C&C08 program-controlled switch has encountered a lot of problems, and the original delivery time agreed with Yiwu in May this year had to be delayed to October.

Now that it has entered June, the C&C08 program-controlled switch still has many problems that have not been solved.

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

In history, it was the addition of another genius that brought Warwick's C&C08 program-controlled switch project back to life.

This is Li Yinan.

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

In June 1993, Li Yinan joined Huawei after graduating with a master's degree, and 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, chief engineer of Huawei Company and president of the Central Research Department in two years, and vice president of Huawei Company at the age of 27.

It was this talented teenager who made Warwick's C&C08 project a success.

In the following years, Huawei continued to improve on the basis of C&C08 program-controlled switches, and once again developed 10,000-door program-controlled switches, and sold this series of products to all over the world, bringing hundreds of billions of RMB revenue to Huawei, and achieving the cornerstone of the first stage of Warwick's rise.

But now, Li Yinan hasn't come yet.

Pang Xuelin could just make a time difference and hand over the design scheme of the complete version of the C&C08 program-controlled switch to Ren Zhengfei's hands.

The office was silent, except for the sound of Xu Wenwei turning the pages.

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

From the carelessness at the beginning, it gradually became shocking, and then later, it was completely dignified.

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

"Xiao Xu, how is it?"

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

Xu Wenwei doesn't believe that this is Pang Xuelin's handwriting, this design plan is mature, the design concept is ingenious, and there are many places that make people amazed.

Only those 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, "Far away in the sky, close in front of you." ”

"You're talking about yourself?"

Xu Wenwei's face showed disbelief.

Even Ren Zhengfei was shocked.

Just now Xu Wenwei asked Pang Xuelin whose handwriting this information was, and Ren Zhengfei realized that this technical information was not ordinary.

But he never expected that this information would be the handwriting of the young man in front of him who looked like a high school student.

Pang Xuelin smiled: "What, don't you believe it?" ”

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

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

Xu Wenwei and Ren Zhengfei couldn't help but look at each other, and they didn't know whether what Pang Xuelin said was true or false.

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

At this time, Mu Qingqing and Liu Fatzi also spoke: "We can also prove it." ”

Mu Qingqing then added: "Mr. Ren, Brother Pangda is amazing, some time ago he also made a new audio-visual player CVD, the price is much cheaper than the LD laser player on the market, ordinary discs can be played, the reason why Brother Pangda is looking for you Warwick cooperation, on the one hand, because he knows that you have encountered difficulties in the research and development of program-controlled switches, 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 glanced at each other, Xu Wenwei smiled bitterly: "Brother Pang, it's not that we don't believe it, this is ...... It's a little incredible. ”

After a moment of silence, Xu Wenwei said: "Brother Pang, since you said that you designed it, can you tell us about your design concept?" ”

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

"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 the program-controlled switching system can be divided into two systems: the telephone system and the central control system. The telephone system consists of a switching network and peripheral circuits. The peripheral circuit includes several parts, such as user circuit, repeater, scanner, network driver and telephone equipment interface. The function of the central control system consists of two aspects: on the one hand, it handles calls, and on the other hand, it manages, monitors, and maintains the daily operation of the entire switch. ”

Let's start with the fundamentals of user modules. The user module is the interface of the switching network between the user's telephone and the digital program-controlled switching system. Its functions can be summarized into seven functions of BORSCHT, specifically: B (Battery feeding) feeding; O (Overvoltage protection) R (Ringing control) ringing control; S (supervision) surveillance; C (CODEC&filters) decoding and filtering; H (Hybrid circuit) 2-4 wire hybrid circuit; T (Test) test. ”

"In digital telephone communication, people's voices are analog signals, so at the sending end, the analog signal will be converted into a digital signal through A/D conversion and then sent to the transmission equipment, and then the digital signal will be restored to an analog signal by the D/A conversion at the receiving end. Digital signals can be produced using a variety of modulation methods. Pulse Code Modulation (PCM) is commonly used. ”

"Time division multiplexing is a way to transmit several discrete signal pulse trains in a channel through grouping, compression, and cyclic sequencing to become multiple signals that do not overlap each other in time. Time division communication, also known as time division communication, is the main method of digital telephone multiplexing, so PCM communication is often called time division multiplexing. ”

"From the process of converting the voice analog signal into a digital signal, it can be seen that in order to ensure that the receiver can restore the discrete digital signal into a continuous analog signal, the sampling frequency needs to be 8000 Hz, that is, every 125 microseconds, each channel occupies a period of time, this time is called the time slot. The higher the number of channels, the smaller the time slot of each lane. In China, the PCM30/32 system recommended by CCITT is used as the primary group of standardized time division multiplexing system. ”

"The task of a telephone switching system is to establish temporary channels (continuations) of voice signals between subscriber lines, between subscriber lines and trunks, or between trunks and trunks. This work is finalized by the exchange network. In the current program-controlled switching system, the switching network can be divided into two types: air division switching network and time division switching network. ”

……

Pang Xuelin's tone was not slow, and he told the principle of the program-controlled switch, and after talking about the principle, he continued: "This is the basic principle of the program-controlled switch, and then I will explain my design plan according to the basic principle." ”

"In this program-controlled switch I designed, it mainly includes the central management/communication module (AM/CM), and the service processing module (SPM), shared resources, and modules (SRM) are physically integrated with AM/CM."

"The Central Switched Network (CNET) completes the service switching function, and its capacity can be superimposed in units of 16k × 16k time slots according to the actual situation, and the maximum can be 128k × 128k time slot switching. The service line interface module (LIM) mainly completes the composite/decomposition of business data and communication signaling data and the system transmission line driver interface function, so that AM/CM can be connected to various network devices. The LIM also provides a voice and signaling interface between the Service Processing Module (SPM) and the Shared Resource Module (SRM), enabling the Service Processing Module (SPM) and the Shared Resource Module (SRM) to be embedded in the AM/CM. The post-management module (BAM) completes the operation and maintenance of AM/CM and connected users, and provides centralized fault alarms, and has the functions of data management, providing network interfaces for terminals, and realizing remote/centralized maintenance......"

"The Synchronous Timing Module (CKM) ensures that the system is synchronized with the upper level network and provides the synchronization timing benchmark used by each module within the system. The central processing module (CPM) stores and processes global data in the system and is responsible for managing the boards in AM/CM. The Service Processing Module (SPM) completes the processing of signaling and services. The Shared Resource Module (SRM) provides all kinds of necessary resources required for business processing, including signal tone, two-tone receiver, multi-frequency intercontrol transceiver, caller ID display, conference phone, etc.......

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

While listening, Xu Wenwei nodded frequently, and from time to time used a pen to record some of what Pang Xuelin said.

The expression on Ren Zhengfei's face also changed from shock at the beginning, and then gradually became appreciative, and then later, his face was already full of smiles.

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

Mu Donglai was very interested, although he didn't understand it very well, but from the expressions on Ren Zhengfei and Xu Wenwei's faces, he could already see that Pang Xuelin was conquering the other party step by step, just like conquering himself and Liu Fatzi at the beginning.

It was Mu Qingqing, with her chin pinched, staring at Pang Xuelin without blinking.

The eyes are slowly full of worship and love.

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