"Distribution box?"
The old principal was stunned for a moment, then raised his hand and pointed outside the gymnasium:
"As for the distribution box..."
"We install them uniformly on the exterior walls..."
Without saying a word, Sakaki Makoto immediately walked out the door.
A few people were left behind to guard the scene, and Megure Jusan and others quickly followed.
They are very curious about what Makoto Sakaki wants to do...
Is this case related to the distribution box?
The group hurried to the outer wall of the gymnasium, and under the guidance of the old principal, they found a metal box hanging on the wall.
At this moment, the box that should have been locked was opened by force.
The iron lock fell to the ground, and the gap on it was smooth and neat, as if it had been cut off by someone using a pair of scissors or something like that.
"this...."
Megure Jusan was shocked:
"Who did this?"
"Prisoner."
Holding a cigarette in his mouth, Sakaki Makoto said expressionlessly:
"I just discovered that the smoke alarm used in the gymnasium is a wired network type, right, Mr. Uematsu?"
"Um."
The old principal nodded:
"That's right."
"Brother Sakaki Makoto, what does this have to do with the case?"
Confused, Megure Jusan didn't understand why Sakaki Makoto suddenly turned his attention to the alarm.
"It's a big deal..."
With a light sigh, Sakaki Makoto opened the cover of the distribution box and saw that several circuits inside had been completely disconnected.
As expected...
Rubbing his brows, Sakaki Makoto explained:
"The smoke alarm used by Teitan Elementary School is very advanced. It uses the NITTAN-CCA-ASW remote networking system. Once a fire occurs, it can trigger functions such as water spraying and buzzing while giving an alarm."
"but..."
"The school uses ADSL network."
"What the hell?"
Everyone was dumbfounded. They had no idea what Sakaki Makoto was talking about. It was as obscure and difficult to understand as reading a wordless book.
Megure Jusan opened his mouth and asked:
"Can you explain it in more detail?"
"....Can."
Sakaki Cheng reached out his hand, picked up a broken wire in the distribution box, and said:
"As a new technology, the ADSL network uses frequency division multiplexing technology to divide ordinary telephone lines into three relatively independent channels: telephone, upstream network, and downstream network, to avoid mutual interference."
"That is to say, devices using ADSL technology can divide multiple lines, connect multiple devices, and finally transmit data through an ADSL terminal - a 'modem'."
"ah....."
Megure Jusan pondered for a while:
"so what?"
grass!
Sakaki Makoto was speechless.
He explained it so thoroughly, yet Megure Jusan still didn't understand?
Will you use electronic devices...oh.
Megure Jusan...
He seems to know nothing about electronic equipment.
This is a good explanation...
Time waits for no one, Sakaki Makoto doesn't want to waste so much time, so he can only simplify his words:
"When a fire breaks out, the smoke alarm in the gymnasium sends out a signal, and the signal will pass through this telephone line in my hand, first into the ADSL terminal in the school, and then be transmitted to the fire department to tell them that a fire has occurred somewhere."
"At this time, the fire department will call the school to ask if there is a fire and then decide whether to send police or not."
"It's like a local area network. Once the telephone line outside the stadium is cut off, it will be completely isolated. Even if the smoke alarm can work normally, the signal cannot be transmitted!"
Scratching his head, Megure Jusan gave two dry laughs, feeling a little embarrassed.
Seeing his expression, Sakaki Makoto immediately realized that he didn't understand at all.
but...
Sato Miwako understood:
"I see... But why not just pass the signal to the fire department instead of going through all that trouble?"
“Because the line length exceeds 1.5km, the fire department uses an ADSL telephone line real-time monitoring feedback system.”
Inspector Yumio took two steps forward and looked at Sakaki Makoto admiringly:
"Mr. Sakaki, have you worked in the fire department before?"
"....No."
"Then how do you know this knowledge?"
“Isn’t this common sense…”
Spreading his hands, Sakaki Makoto was also helpless!
Ordinary people may not need to know so much, but as a police officer...
If you don’t even have this little knowledge, how can you deal with difficult prisoners?
You know, prisoners are also constantly learning and improving!
There are more and more high-IQ crimes. If you can't keep up with your opponent's pace, you will be pinned to the ground.
If you want to catch up later, there is a necessary prerequisite - speed!
That's right, as long as you attack faster and react quicker than your opponent, you can complete a series of complex operations such as snatching a knife with your bare hands and dodging bullets.
The eyes need to be clear and the hands need to be steady, accurate and quick!
This is Sakaki Makoto's secret to dodging bullets, and also his secret to always being successful in solving cases.
"Even if the prisoner cut off the phone line, the sprinkler buzzer system didn't trigger!"
Megure Thirteen said blankly:
"What is the purpose of the prisoner doing this?"
"As I said earlier, the smoke alarm will transmit a signal to the terminal."
Sakaki Makoto said calmly:
"For places like schools with multiple buildings, the lines are usually connected to the fire alarm controller for unified processing planning."
"The CCA-ASW smoke alarm system used by Teitan Primary School is an intelligent temperature-sensing detector that can monitor indoor temperature in real time, transmit the data it collects to the local area network host, receive information sent back by the host, and independently determine whether to activate the sprinkler buzzer and report a fire alarm."
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