Chapter 427: Taking bigger steps
Gao Zhendong almost laughed out loud, knowing that we like to touch the eagle sauce to cross the river, but this touch, that was never expected.
Citigroup's International Telephone and Telegraph Company (ITT) was also ambitious when developing program-controlled digital switches. Its European company planned switches in four specifications: ITT1220, 1230, 1240, and 1280.
The capacity ranges from 500 lines to 60,000 lines, covering from long-distance international exchange offices to large local office offices, small local office offices, and rural office offices. It is really a broad layout and comprehensive coverage.
After working on it for more than a year, I found that it was too bad and I thought too much, so I immediately reduced the front line and concentrated on ITT1240.
The reason is that they found that there is no need for so many types. The program-controlled switch architecture adopts a multi-level network, and with different numbers of cabinets, it can cover needs from 60 to 100,000.
It’s so funny that there are only four kinds!
For the Communications Institute, in addition to this reason, the more realistic reason is that this stall cannot be built at all, and it would be too wasteful to forcibly split it into three sets.
Gao Zhendong did not object outright, but asked them a question: "What are your thoughts on large, medium and small."
"Large 6,000~20,000 doors, medium sized 800~6000 doors for large ones and 100~800 doors for small ones.”
Their plans are not as exaggerated as ITT's, mainly because China simply does not dare to think of such a large telephone network now.
"What are their specific structures? What are the differences."
Comrades from the Telephone Research Institute are confident: "Use multi-level network, distributed control, small 800 doors only use second-level network , the medium-sized one uses a three-level network to increase the network depth based on the small one, and the large-sized one increases the network width based on the medium-sized one. The medium-sized and large-sized network units adopt the same structure, and each network unit is controlled by a DJS-60D , to facilitate generalized production, the difference is..."
Speaking of this, looking at the smile on Gao Zhendong's face, he seemed to feel that something was wrong.
Chief Engineer Feng looked at Gao Zhendong's smile and glanced at his comrade.
"Mr. Gao, what do you mean?"
After studying Gao Zhendong's materials, the comrades from the Telephone Research Institute are quite thoughtful. Distributed control can effectively solve the problem of scale expansion of centralized control methods. shortcomings.
When the scale of the centralized control network increases to a certain level, the control center computer must be replaced. With current computer technology, it is inconvenient to expand through clustering and other methods.
Just one question.
Gao Zhen smiled and said: "What I mean is that the three of you are actually the same type, which is a three-level network switch with 100 to 20,000 doors. The difference is the number of units in the third-level network. It’s just different. For modular cabinets, it’s just a matter of addition and subtraction, just like a gun can hold 8 bullets or 30 bullets, but the gun is still the same gun.”
However, when Gao Zhendong said this, the comrade at the Telephone Research Institute blushed a little. In fact, it was not that he did not understand the problem at all, but...
When Gao Zhendong said this, he did not go too far and added: "I see, It’s okay to divide it into three models, but don’t divide it into three stalls. That would be a waste.”
There is a big difference between dividing it into three models and three stalls.
If there are three models, in fact, the researchers can still be managed and divided into the same team. It is just two more models, and the Institute of Communications will look better when reporting results.
“Last year in our office, the whole office worked hard and worked hard to complete the development of XXX large-scale program-controlled switches, YYY medium-sized program-controlled switches, and ZZZ small program-controlled switches in one fell swoop, fully covering all types of cities, towns, and rural telephones across the country. The need for exchange.”
This sounds so nice to say. Gao Zhendong understands this.
As for dividing it into three stalls, that would be a big problem. If nothing else, the management costs would at least double, not to mention other costs, such as testing fees and material costs, which would definitely triple , because the same experiment will be done three times.
Moreover, three groups of people researching the same thing not only dilutes the strength, but also the three groups of people are unlikely to form a joint force. Instead, they will fight with each other, delaying each other and making stumbling blocks more likely to occur.
That’s why Gao Zhendong said that three models are OK, but three stalls are not.
In response to Gao Zhendong’s words, Chief Engineer Feng breathed a sigh of relief. They are divided into three models: large, medium and small. Apart from the inertia caused by not being too accustomed to modularity, it actually means something like this. Several models, good looking, good returns.
Chief Engineer Gao obviously understood their thinking, but he drew a line. Three brands and one team should be used in one place. Three brands and three teams should not be wasted repeatedly.
As for how many models you want to mix and match to announce the good news after the research is successful, that's all casual. In fact, it will not cause any loss or waste. If you have to say it, you may just make three sets of one set of materials. The difference.
As for the Institute of Communications, which has obtained the ideas and basic principles, and the DJS-60D is also a publicly used device, why not just leave Gao Zhendong alone and do it on his own? Wouldn’t that mean he can do whatever he wants?
They are not stupid.
Leaving aside the moral aspects, technology and resources are inseparable, and they are registered with the authorities. If things go too far, they are definitely not the ones who are unlucky.
If we use the darkest psychology and a purely technical perspective to predict, they will start from scratch one day, and the next day, President Gao will be able to recruit another team to do it, and it will be done faster than them.
Just looking at the basic knowledge Gao Zhendong gave them, and the various control signaling, software and hardware structures, and processing procedures derived from it, their heads exploded just thinking about it, and they couldn't find a clue at all for a while. .
You have to have your back against a big tree to enjoy the shade. Mr. Feng smiled and said: "Well, Mr. Gao's suggestion is good. The matter can be divided into three parts, and the power must be used in one place."
Your suggestion, your kindness , we received it and followed it.
As Chief Engineer Feng said this, he was praising him in his heart. He heard that Chief Engineer Gao had been an excellent commander before going to college, and he really lived up to his reputation.
Catch what needs to be done and let go of what can be done, fully taking into account the emotions and actual needs of all parties without destroying the essence of the work.
Sure enough, people who can achieve this level are not simple.
Everyone praised General Engineer Gao for his correct thinking and the atmosphere was extremely harmonious.
Under this situation, comrades from the Telephone Research Institute continued to report their ideas and problems.
"We are ready to adopt it."
The comrades at the telephone office were well prepared. Gao Zhendong listened and nodded. Well, he is indeed professional and has a lot of insight in the general direction.
“We have investigated the situation of remaining reed relays according to your arrangement. Based on the materials you provided, Mr. Gao, we are now inclined to use electronic switches directly instead of relays.”
< br>When Gao Zhendong heard this, he said, good guy, he is indeed engaged in information technology. He has taken big steps, which is too big.
Electronic switches have no metal contacts and have many benefits, such as low power consumption, fast switching speed, long life, small size and light weight.
The most common electronic switch, the photocoupler is one of them.
There is only one problem: at this time, electronic switches are not very reliable. It does not mean that the switch state is unreliable, but it has a great impact on the signal. After being inserted into the switching circuit, it will have a great impact on the signal transmission. Influence.
Relays have ten thousand shortcomings, but their metal contacts are eight blocks better than electronic switches.
In the 1960s, when electronic technology was still underdeveloped and signal processing technology was also lagging behind, given the domestic technical environment, it was a bit of a stretch to jump into electronic switches in one step.
Even if semiconductor technology improves, electronic switches themselves can be used. It is difficult to say how much semiconductor production capacity can be allocated to electronic switches in a short period of time.
How big this step is for the Telephone Research Institute can be seen by comparing it with an example. It was only in 1981 that Gallic Chicken completely stopped purchasing electromechanical switches and used all electronic switches.
Gao Zhendong smiled and said: "Which type of electronic switch do you prefer to use initially?"
Gah~~~~~~ It's stuck.
“I haven’t found a suitable one yet.”
Gao Zhendong knew that we couldn’t use electron tubes. They could also form electronic switches, but they were so unreliable that they were basically The above can be regarded as adding up the shortcomings of relays and transistor electronic switches.
Gao Zhendong smiled and said: "If you don't find a suitable one, then you should use a relay first. It's not good to take too big a step."
I won't say a few words, this is not popular now. .
In fact, there are very few fully electronic switches for air separation, and relays are basically the majority. For air division switching, the high switching speed and long life of electronic switches are not of much use. One call for air division switching only requires a few switches.
However, the program-controlled switches for hours and minutes are all electronic switches. Without these things, there is no way to realize hour and minute exchanges. Hours and minutes or digital exchanges can be switched tens of thousands times per second, let alone the speed of relays. Is it enough? Even if you simply count the number of switches and the lifespan, it won't last more than a few seconds.
Hearing Gao Zhendong’s words, the comrades from the Telephone Research Institute were a little embarrassed, but Mr. Feng didn’t care. This is not even a plan, it can only be said to be a preliminary idea. It is normal for some problems to arise, otherwise What is the leader used for?
It's just that the comrades at the telephone office couldn't even find a suitable model and just stuffed it into the project. This is a problem. I have to talk to them when I get back.
Gao Zhendong said: "The electronic switch is not suitable. Let's go back. Can you talk about the remaining reed relay mentioned just now? How is the situation?"
The comrades at the telephone station are basically The work is still done solidly.
“We haven’t found one ready-made, but based on the principle you mentioned, we are confident that we can make it, at least to achieve the effect of maintaining the state.”
“Well, in that case, Then go down this path. The key is to be miniaturized and meet the requirements of electrical performance and service life. As for maintaining the condition, it’s best to have it. If not, it’s not a big problem. The worst thing is to use a little electricity to solve it.”
Gao Zhendong once again reiterated the key points of relays, but don’t miss the key points again.
(End of this chapter)