Rebirth of the Tech Madman

In the field of network operations in the telecommunications industry, monopolies are more common. Take the United States as an example. AT&T, the American Telephone and Telegraph Company, occupies 80% of the US telephone market.

　　 In the previous life in 1984, AT&T was forced to spin-off due to an antitrust lawsuit by the US Department of Justice.

　　 There is a saying that before AT&T was split, IBM was the second largest company in the United States. After AT&T was split into seven companies, IBM's ranking became eighth.

　　 From this we can see how far the monopoly phenomenon had reached at that time.

　　 And the equipment manufacturing field in the telecommunications industry is also full of tycoons, with the shadow of state capital to varying degrees.

　　 Of course, latecomers are not without the opportunity to join them, because the world's telecommunications industry is ushering in a new round of technological upgrading.

　　 The Public Switched Telephone Network, or PSTN, can be called the largest network in the world, and its establishment can be counted from Bell's invention of the telephone in 1876.

　　 Among the two major components of PSTN, the transmission system is mainly composed of transmission equipment and cables.

　　 The current transmission equipment technology is mainly carrier multiplexing, and the cable is mainly copper wire, but the corresponding latest technology, Synchronous Digital Hierarchy, namely SDH and optical fiber, is gradually beginning to take off.

　　 PSTN is another major component of the switching system, and the equipment used is mainly a telephone exchange.

　　 With the advancement of electronic technology, telephone exchanges have undergone magnetism, step-by-step systems, and crossbar systems, and have developed into the current program-controlled exchange stage.

　　 In 1970, France opened the world's first program-controlled digital telephone exchange, which adopted time division multiplexing technology and large-scale integrated circuits.

After 　　, other countries have vigorously developed and followed up quickly.

　　 The 1980s in the past life was the period when program-controlled digital telephone exchanges became popular in the world.

　　 In the PSTN, the switch that the user connects through a direct connection is called an end office.

At present, analog signals are mainly used for transmission between users and end offices, and digital signals are used to connect users and end offices. The integrated service digital network work, or ISDN, has emerged. For example, Deutsche Post decided to change Germany in 1979. All local calls are digitized.

　　 In the original time and space, after the 1990s, in European countries represented by Germany and Japan in Asia, ISDN became popular on a large scale. However, in the United States, because of poor market promotion and low price advantages, ISDN became a tasteless one.

　　 As for Longguo, although the telecommunications industry is developing rapidly, it takes a process after all.

　　 Therefore, when ISDN was common in European and American countries, Longguo introduced this technology and began to install central office equipment in a few pilot cities.

　　 At this time, the digital subscriber line DigitalSubscriberLine or DSL technology, and the asymmetric digital subscriber line AsymmetricDigitalSubscriberLine or ADSL technology has matured and been promoted to the market.

　　 So invisible, Longguo avoided the ISDN pit and entered the era of ADSL directly.

　　 At the beginning of the design of the telephone system, it was mainly used to transmit voice calls. For economic reasons, the designed transmission frequency range was 300Hz to 3.4KHz.

　　The copper cable from the end office to the user can actually provide a higher bandwidth, ranging from at least the lowest frequency to 200-800KHz, depending on the quality of the circuit and the complexity of the equipment.

　　Different from ISDN with a fully digital connection, DSL uses additional frequency bands higher than 3.4KHz on the telephone line to transmit data, so that it can provide various additional data services in addition to basic call functions like ISDN.

The concept of DSL can be traced back to Bell Labs in 1988. At that time, an engineer devised a method to load digital signals into unused frequency bands of telephone lines. Data communication is provided on the telephone line.

　　 However, Bell's management is not enthusiastic about this technology, because if the user installs two lines, it will bring more profits.

　　 In the late 1990s, cable television companies began to use the two-way coaxial cable in their own cable television network to provide broadband Internet access, and Bell just woke up like a dream.

　　 After realizing that most users would absolutely give up installing two phone lines to access the Internet, Bell finally moved out the DSL technology they had been discussing for 10 years to compete for cable TV network companies’ broadband market share.

　　 For a long time, DSL technology and Cable Modem, C.M., have become major competitors in the broadband access service market for home users in Europe and North America.

　　 As a rebirth, the development trend of the telecommunications industry in the next few decades is naturally within Tang Huan's grasp.

　　Although the barriers to entry in this field are very high, the rapid technological advancement also means changes in rules. In the future, cable companies will use their own networks to challenge the status of traditional telecommunications companies to provide Internet access services. There are countless examples of this.

　　 The breakthrough that Tang Huan thought of was that point in the huge PSTN-program-controlled digital telephone exchanges, especially private branch exchanges, or PBXs, dedicated to serving specific enterprises or institutions.

The main task of a PBX is to complete the telephone exchange between extensions in the system and with the PSTN. The most obvious advantage is to reduce telephone charges by processing the internal line conversion of the system, and it can also increase some service functions that the telephone company does not provide, such as smart search. Line, user call, dial extension, etc.

　　 In the PBX structure, the single-chip microcomputer used for data processing and control is Tang Huan's housekeeping skills. As for other technical R&D engineers, there are a lot of companies available for digging.

　　 Besides, didn’t Huawei start from being a switch? Tang Huan has too much experience to learn from.

　　 On the other hand, the most practical way to connect a personal computer to the PSTN at present should be a modem.

　　 As early as 1962, AT&T released the first commercialized modem Bell103.

　　 By 1978, American Dennis Hayes and his partner Dale Heatherington successfully sketched out the prototype of the smart modem on the dining table. In the same year, 29-year-old Hayes founded Hess Computer Products in Atlanta.

　　 Dennis Hayes loves Chinese culture. Not only did he take the Chinese name He Danyi for himself, he also married a Chinese Ningbo native as his wife.

　　 He Danyi’s company successfully developed HayesSmartModem, or Hayes Smart Modem, in 1981. This product belongs to the real standard smart modem and is a major advancement.

Before the advent of smart modems, in order to establish a connection, almost all old-fashioned modems needed to manually dial the other party's number on the phone, and then put the handset in the oupler that came with the modem, which was a voice coupler, one with two rubber cups. Composed of equipment used to convert between sound signals and electrical signals.

　　With a smart modem, in addition to not requiring a voice coupler, more importantly, you can directly connect the smart modem to a standard telephone line or socket, and then the computer can automatically complete the function of connecting to the phone and dialing the number.

　　 It can be said that this change greatly simplifies the installation and use of the electronic bulletin board system or BBS.

In the original time and space, although Hayes was finally abandoned by the market, it relied on its own advantages in first-mover technology and occupied a dominant position in the modem field for a long time. The AT command set it proposed has almost become an industry standard. Smart modems of other brands will specifically state Hayes-Compatable on the package that is compatible with the Hayes standard.

　　 Regarding this refined industry, Tang Huan did not pay special attention at first. He planned to wait for the basic R&D of Fangyuan's second-generation computer to be finalized, and then purchase it from Heshi as needed.

　　 But in order to develop a fax server, the smart modem was carried and a prototype was made. If it is not fully used, it would be a pity.

　　 And if users can use Fangyuan computers and smart modems while also allowing network operators to use telephone switches developed in accordance with their own design goals, maybe the early dial-up Internet access methods in the past will emerge more smoothly.

The only thing worth worrying about is that the research and development and operation of telephone exchanges must be very expensive in the early stage. Under the principle of isolating non-related industries that I have formulated, I don’t know whether the incubator of Zheru American Inc. can rely solely on its own ability to attract money. Take up this task.

　　 "You said, our newly developed digital fax machine, is it attractive to a rich man like the Hong Kong Police Force?" Tang Huan asked Zhou Wei, who was next to him, turning his head.

"Only in terms of functions, it has great advantages, but I don't know what kind of strategy is in pricing." Zhou Wei?j muttered, "but you can follow Feng Xingjun's routine, first pull it on our ship, and then take another step. Squeeze out profits step by step."

"Your cooperation is becoming more and more tacit." Tang Huan shook his head and laughed. "In this case, I have to work hard to control the cost of the product. It just so happens that I am going to Japan to see if Sharp can produce a batch of OEM. Now Japanese companies have the highest enthusiasm to move closer to us."

　　 Everyone has been discussing the problem of digital processing of fingerprints until the end of get off work, and the technical solutions are finally finalized one by one.

　　 Tang Huan took a deep breath, returned to his office, raised his neck and drank the tea in the cup.

After 　　, Tang Huan began to write the research and development plan of the program-controlled digital telephone exchange. It was not until his stomach groaned that he remembered that he had not eaten dinner yet.

　　Secretaries, bodyguards, a lot of them, but nobody cared about whether he was starving or not. Tang Huan complained and picked up the phone, forgetting that he himself had made an agreement not to disturb his work easily.

　　 Tang Huan wanted someone to prepare dinner for himself, but he remembered Zhao Yazhi who had been mixing oil with his own honey these days, so he called the apartment over.

Soon, the phone was connected, and Zhao Yazhi’s gentle voice came ~www.wuxiahere.com~ Tang Huan was refreshed and asked: "Has the apartment been furnished yet? I haven't eaten dinner yet, I can come to you. Can I solve it there?"

　　 "Then come here." Zhao Yazhi smiled and agreed.

　　 "There is a door." Tang Huan was overjoyed. It seems that no matter the body or the spirit, he can have a full meal again.

　　 The high-end apartment that Tang Huan gave to Zhao Yazhi is located near the broadcast channel where TVB is located. He quickly rushed over.

　　 "Let's cook noodles and eat, it's fast and convenient." Zhao Yazhi leaned out of the kitchen and said to Tang Huan who was changing shoes at the door.

　　 "Okay." Tang Huan agreed, and went into the living room to look at the decoration. It was very elegant and gave him a homely feeling. When he came, the heat in his heart could not help but slowly cool down, and his heart became warm.

　　 "My personality is really complicated." Tang Huan muttered to himself, sat down on the sofa comfortably, and asked casually: "Azhi, I'm going to Japan. You can take a trip by the way."

"No, I still had the ideal of traveling around as a flight attendant, but now it's gone." Zhao Yazhi refused directly and made a grimace. "Besides, I'm afraid you will be foolish, and I will call you every day. The ground is not working."

　　 "Hey, it doesn't give you face so much, it seems you have to use it." Tang Huan stood up, with a threatening look on his face, and forced him to pass.

　　 "Don't make trouble, I'm cooking the noodles. If it's battered, I won't have to eat it." Zhao Yazhi laughed and quickly dodged.

"Eat you first, then noodles." Tang Huan snorted and grabbed Zhao Yazhi's slender waist. There was a whining sound from the kitchen~www.wuxiahere.com~Welcome to visit and read. , The latest, fastest and hottest serial works are all at ~www.wuxiahere.com~. ;