They regarded themselves as students and Jiang Xinwei as teachers, and often asked Jiang Xinwei for technical problems, and often discussed technical issues with Jiang Xinwei.

Seeing their changes, Jiang Xinwei was even happier. He knew that in time, their scientific research team would definitely be able to successfully snipe at Goldman Sachs in the United States and ETSI in Europe, and would be able to snatch the patents that originally belonged to these companies in their previous life, and apply for them one step ahead of them before those companies developed scientific and technological achievements.

Truly realize Jiang Xinwei's greatest willingness to "take the path of others and let others have no way out".

After communicating with the experts for more than three hours and debating fiercely for three hours, Jiang Xinwei felt comfortable in his heart, but his mouth was also dry, and when he saw that everyone did not ask any more questions, he said goodbye to them and walked out of the scientific research building that had just been put into use and walked towards the administrative building where his office was located.

However, before he could go up the steps, a middle-aged scientific and technological personnel chased after him from behind and shouted: "Mr. Jiang, please wait a minute, please wait a minute......

Jiang Xinwei stopped, turned to look at the visitor, and asked with a smile, "Zhao Gong, is there something wrong with me?"

The name of the person is Zhao Yi, who is the deputy chief engineer in charge of the research and development of program-controlled switches. With the rapid progress of the research and development of program-controlled switches, now Jiang Xinwei, the nominal chief engineer of the project, has become the shopkeeper, almost no longer intervenes, only in the discussion of key technical nodes, he only participates, saying a little about the technology of program-controlled switches in his previous life, and also pointing out the direction of the project, or correcting the problems that have deviated.

And most of the work was handed over to Zhao Yi, and even some technical research was presided over by him, and he retreated into the background. It is precisely because of this that many technical experts, including Zhao Yi, began to grow rapidly and became masters who can take charge of themselves.

Zhao Yi took a breath. said: "Mr. Jiang, we just conducted a test run on the newly assembled switch. ”

Jiang Xinxu sighed and asked, "What is the result?"

Zhao Yi replied: "The loading of the number is very smooth, and we did not encounter any problems when this switch was opened. There are only a few ports where there is some small noise. These noises are so small that they are not felt by the human ear at all, and must be detected with the help of an instrument. ”

Jiang Xinxu nodded and asked, "Then you have found the cause of the noise and have you found a solution?"

Although this kind of small noise that cannot be detected by the human ear will not affect the sales and use of the product, it can only be regarded as a hidden danger of failure, and the designer and producer may not invest too much energy and money to solve them under the premise of considering the cost, because the user may never find its storage, or can tolerate it if it is found. But not addressing them doesn't mean designers should ignore them. Instead, the designer should find out the cause of these small noises and develop a solution.

Because once the equipment with hidden fault hazards is put into use, if it happens to encounter unpredictable reasons such as improper use by users, poor operating environment of the equipment, deterioration of the performance of a certain function board, etc., these hidden dangers are likely to erupt, and small noises suddenly become large noises and loud noises that users cannot tolerate. At this time, the designer of the manufacturer must come up with a plan for the maintenance personnel to implement, and the outbreak of faults must be dealt with in the shortest possible time.

Only in this way will the failure not have a chain reaction. It will not affect the credibility of the enterprise.

Zhao Yi hurriedly said politely: "After analysis, we have found the reason. The functional boards with the new electronic components have been replaced, and the problem has been solved. As long as we purchase those new models of electronic components, we will have no problem with the manufacturer to put forward a new technical parameter requirement, and I believe that the company will also agree to pay attention to this parameter. ”

Jiang Xinwei nodded with satisfaction, and then asked, "The phone can be connected, what are the problems?"

Zhao Yi said embarrassedly: "I don't know why, when we made an outgoing call." The trunk board always has the problem of not releasing the time slot, and after a 2M relay board repeatedly makes more than 20 outbound calls, half of the lines will hang, and the time slot is busy. ”

In communication equipment (including program-controlled switches and optical transmission equipment), the call path occupies time slots. The word time slot is a communication term. It's a bit cumbersome to explain, so let's put it in simple terms. When we pick up the landline phone to make a call, our voice communication guò phone is transmitted to the user function board of the switch, and the digital-to-analog conversion chip in the user function board converts the analog voice signal into a 64K digital voice signal.

In order for this 64K digital voice signal to be transmitted, it must occupy a time slot in the 2M relay line. There are a total of 32 time slots in the 2M trunk line (2M divided by 64K equals 32), and one of the time slots is used for signaling, and one of them is idle for standby, and only 30 time slots can be used for voice transmission.

In the program-controlled switch, a phone path occupies a time slot (in digital mobile phones, a user generally only occupies half a time slot, that is, the voice bandwidth of mobile phone users is only 32K. VoIP phones have a lower voice bandwidth and do not occupy a fixed time slot, so the call quality is slightly worse than that of landlines and mobile phones).

Thirty time slots allow thirty pairs of users to talk. When the user makes a call, the monitoring unit of the program-controlled switch temporarily applies for a time slot for the user, and when the user hangs up after the call, the program-controlled switch should release this time slot for the later user to use.

Once the program-controlled switch hangs one of the time slots due to software or hardware reasons, the 2M relay board will reduce one phone lane, and can only allow 29 pairs of users to talk. Naturally, the more hanging, the fewer lines that can be used to talk, and the lower the utilization rate of the 2M relay board.

When Jiang Xinwei heard this, he was happy. However, instead of showing Xiàn on his face, he asked, "Can't find the reason?"

Zhao Yi said embarrassedly: "I didn't find it." In his heart, he said: If I find the reason, will I still run to you?

Jiang Xinxu said: "Then look for it again, if you can't do it today, you will ...... tomorrow."

Zhao Yi was stunned for a moment, and blurted out: "You don't go?" Obviously, this was a bit abrupt, and he explained, "Mr. Jiang, this problem is very strict, if it is not solved immediately, we can't finalize the program-controlled switch at all, and we can't pass the acceptance of the acceptance team, won't this delay the progress of scientific research?"

Jiang Xinwei asked rhetorically: "This is a small switch, if you encounter a little difficulty, you will find me, if you encounter this kind of similar problem when developing a large switch in the future, will you still look for me?" Then, he said seriously, "I tell you, this problem involves a lot of technology, you don't underestimate it, stop the test first, and spend a little more time and energy to find out the cause." If you solve the problem yourself, then it means that we have made a lot of progress in the development of program-controlled switches this time!"

Zhao Yi looked at Jiang Xinwei in surprise and blurted out, "Mr. Jiang, have you expected this kind of problem?"

Jiang Xinxu smiled and said, "What do you say?" Go for it!"

Zhao Yi responded depressedly, and was about to ask Jiang Xinwei if he could give a hint, but seeing that Jiang Xinwei had already entered the building, he had to turn around and leave, muttering while walking back: "No matter how he looks at it, he knows the reason, how can he expect this to happen?...... Is there really such a big technical gap between me and him in program-controlled switches? When did he acquire so much knowledge?"

The reason why Jiang Xinwei is so confident is not because he is a god and can know the cause and solution of the failure without going to the scene, but because this failure is artificially designed.

He designed this fault because when he was compiling a switch control program, he occasionally remembered that in his previous life, China's most famous private communication equipment company had also encountered this kind of fault when he first developed a program-controlled switch, and this fault troubled the technical staff of this enterprise for a long time, and it took the technicians more than a year to find the cause.

Because the time slot of the switch is constantly hanged, the outbound relay circuit of the guide switch is often busy, and many users are unable to make calls once the traffic is at its peak. In desperation, the company's chief technical officer took an unapproachable approach, that is, in the dead of night when few people were calling, he took extreme measures to temporarily shut down the switch and forcibly remove all the numbers in the trunk board.

Because all the numbers in the relay board are cleared, the time slots that were hung are naturally released, and the relay lines are open again. It's just that those who happen to be on the phone late at night are unlucky and interrupt the call inexplicably.

The post and telecommunications bureau was obviously very disgusted with this practice of the manufacturer, but it was a seller's market at that time, and it was not so easy for the post and telecommunications bureau to buy a program-controlled switch, not to mention that the price of the switch of this private enterprise was advantageous, and the service attitude of the service personnel was also good, and the higher telecommunications department at that time did not have high requirements for communication indicators, and there was no punishment for interrupting telephone communication in the middle of the night, so the leaders of the post and telecommunications bureau had to turn a blind eye and acquiesce to the company's technicians to adopt this method that should not be taken.

In his previous life, Jiang Xinwei heard about it when he was chatting with a friend who had been a technical director in this private enterprise, and he also laughed at them at the time, and did not mean to laugh at them: after all, every enterprise has embarrassing things to happen when it is just starting out, and it has developed all the way. Moreover, their switches have completely solved this problem after upgrading to the new version, and there is nothing to laugh at.

(Ask for recommendation) (To be continued......)