Coquettish Rebirth

What is the electric cat thing?To put it simply, this thing is to regard the power grid as the existence of network cables.Actually speaking, this is actually using the wire network to convert the digital signal to be transmitted into a high-frequency wave signal transmission. The power cat is a way to interpret the load through the high-frequency change of the AC wave. Such a stuff of signal.In fact, in fact, the network cable, the cable TV and the like are considered weak currents—that is, DC circuits or signal circuits such as audio, video, network, and telephone lines. The voltage of these circuits is generally 36 volts. Below, the main purpose is to transmit signal electricity, while strong electricity is used as power energy.

For example, in general residential areas or Internet cafes, there will be some strong and weak electricity rooms. This strong electricity room is to supply all kinds of electricity needs that ordinary people think, and is responsible for providing lighting, air conditioning, computer power, and so on.As for weak electricity, that is what server is connected to the network cable, telephone line or even cable TV.The principle of such a thing as a power cat is "power line communication". In English, it is power-line-munication, or plc for short.And such a power line communication is not a technology that has only appeared in the past few years—it actually appeared in the 20s.At the beginning, when the wired phone just started to enter the civilian market in Europe and the United States, it faced the problem of high prices for the laying of dedicated telephone lines!

In fact, such a problem has also been encountered after our country opened up the installation of telephones in the homes of ordinary people, which is why the initial telephone installation fee was introduced.Such a move is to enable telecom companies to quickly recover the investment in the early stage of setting up dedicated lines!But in Europe and the United States at the beginning, those companies also realized the huge investment in the construction of dedicated lines, so they wondered whether it is possible to use wires to transmit telephone signals?Can it be done somehow.Put the phone signal on the wire, and then interpret the phone signal in the wire in some way?If this works, then naturally there will be no investment problem in the construction of dedicated telephone lines!

Of course, the results of the research on such a problem back then were full of difficulties, but at least some people have been researching it.By 1991, the American Electronics Industries Association had confirmed three home buses.The power line is one of them, which means that the United States has recognized in principle that the power line can carry signals!Then in 97, Nortel in Canada began to study the technology of digital signal transmission on the power line, and the final research result was that it could transmit signals and voice services at a speed of 1mbps on the power line, but such a transmission range is only in Within a family, that is to say, various signal lines still have to be erected to the door of the family.Subsequently, Siemens in Europe also developed the corresponding technology, but this time it has improved a bit, and can use power lines to transmit various signals in a community.You only need to set up the excuse of the signal line in the community.

Under such a technological advancement, 13 companies including Cisco, Intel, HP, Panasonic and Sharp established the "Home Plug Alliance", which is dedicated to researching this wire transmission signal technology, which is still the US-Japan alliance.Europe has seen companies from the United States and Japan start to cooperate, and they are unwilling to let others go. At the Hannover Information Technology Exhibition in Germany, the German power industry giant rwe Power Company launched a new technology called power grid.But why does it seem that various research and development of these technologies began in the early 90s, but in 2012 the market is still dominated by network cables?This brings us to the disadvantages of power line transmission signals-susceptible to power consumption!After all the power lines themselves transmit.That is to rely on the current in the wire that is originally used as energy for signal transmission, no matter how high-end the design is, no matter how much money is invested.The result is that if there is a large power user on such a circuit, it will cause the transmission of network signals and other things to be unstable!

Then why did Jia Hongjian think of the electric cat again?Because of the power line wiring in modern homes, not all lines are one line!Even if it is an old house, there are several wires going into the meter, okay?In the new house, the switches in the house are divided into many switches, some with lighting circuits, some with kitchen circuits, etc. This shows that the wiring in modern houses is originally divided into several wires for wiring!Because the electricity requirements of different rooms in the family are different.So when developers build houses, the lines for wiring are also different.For example, if it is a kitchen, it may need to supply power to the refrigerator and microwave oven.Refrigerators are okay, but microwave ovens are big consumers of electricity, with more than 1000 watts and 1000 watts at every turn!Not to mention in case there is something like an electric kettle.That thing is also more than [-] watts and two thousand watts!If these things are turned on, the load on the line will directly increase!As for lighting circuits such as the living room and bedroom, as well as ordinary power circuits, it may be connected to a home theater, an electric fan or other small appliances, so of course the power consumption will not be large!

As for the wiring used by the air conditioner in the bedroom and living room, it is different - because the air conditioner consumes a lot of power, if the air conditioner is installed in the old house, it is necessary to install a capacity-increasing meter, and a special line is used to increase the capacity, otherwise the old The old wiring in the house can't bear the power consumption of the air conditioner at all!In the new house, in order to avoid the use of ordinary wires by large electricity consumers such as air conditioners, special sockets are used. All of them are 16a current, and the wires in the general socket run 10a current!In this way, the wiring of the air conditioner and the general electricity and lighting circuits at home are separated again!

So, if our power cat is plugged into a common power line, can it avoid the influence of various large power consumers?Actually it is! In 2012, Jia Hongjian had a taste of the early adopters. He bought two electric cats from overseas and came back to play. He found that if the electric cats were connected to the special socket of the air conditioner through the special 16a extension strip, the air conditioner would be The network signal provided by this power cat is really unstable!But if it is used on ordinary household circuits, it will have little effect!In this way, as long as the network is needed at home, you only need to plug in the power cat, and it will be ok!You can send wifi over, and you can also connect the network cable out. Wouldn’t that be easier than opening a slot on the wall during decoration?

However, although Jia Hongjian is very optimistic about this electric cat, after all, he will not completely pin his hopes on such a product-who knows how consumers do it in their homes?There are more weird consumers in the world, and there are more weird developers. What if the developers are just weird and turn the lines into a pot of porridge?So this still needs something like a "traditional" portable wifi!Portable wifi, which started to appear in 2010, is actually a relatively simple and portable small router.The earliest small routers of this kind were not the size of a USB flash drive, but about the size of a playing card.It comes with a small plug. After plugging it into the socket or the wall and connecting the network cable, it can directly convert the network signal of the network cable into a wifi signal.In fact, things like bridging can also be performed, but it is more troublesome to operate.Later, after improvements by various companies, this thing became a portable wifi the size of a USB drive.

Of course, this kind of portable wifi that appeared on the market in history is not quite what Jia Hongjian wanted—the portable wifi that appeared in history can only be called a portable ap, that is, it converts network signals into It’s just a wifi signal, but because this kind of stuff is made into the size of a USB flash drive, it may need a 3G Internet access sim card or the like, so that the mobile phone Internet signal can be converted into wifi, so that people within a range can use it , or turn the network signal of a computer that has been connected to the network cable into a wireless wifi network signal through such a portable wifi through the usb interface.This kind of thing is easy to use, but it is not the same as Jia Hongjian's needs. Jia Hongjian's needs are more like a small bridge router!

Such a small bridge router does not need to leave the same network cable socket as before to connect the computer to set the things inside the router, but directly connect this small bridge router to the big router, and then it can pass through nfc and so on. The near-field communication chip is used for matching, and the background is directly set up, and the relay bridge is directly used to expand the signal!In this way, wouldn't it be a fool?If the previous router wanted to bridge other routers, it would be a trouble!You need to connect to the second router with a network cable, then enter the internal setting interface of the second router, change this thing and that thing, and pay attention to the ip address. This thing may not be difficult in the hands of someone who understands it. , it may be done in 5 minutes, but in the hands of people who don't know much about computers and the Internet, they may not be able to do it well in a week!

So if we make these things foolish, and then make such a portable router more beautiful, even if it is hung on the power socket on the wall, it will not look ugly or obtrusive, and it will look like something that is very harmonious and matches the room. What a nice little accessory for decoration!And after the application of fools, no matter how novice consumers are, they will always buy near-field communication, right?You don't need him to communicate and set up, just connect the big router and the small router together after power on, how simple is that?Then wherever there is no signal at home, just plug it into the socket on the wall of that house.Then it is not ugly, and it also provides a network signal, and finally it can be used for the smart home layout of Huaxia Hi-Tech, which is great! (To be continued..)