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AT & T Bell Laboratory.

At this time, they are also studying one thing.

--broadband.

AT & T did not pin the hopes on the Xingxing plan. [.. COM]

In addition, AT & T also has its own plan.

There are what they are doing now -developing their own broadband networks.

Catherine has established a broadband network across the United States.

But AT & T has no support from the US government. Although the Pentagon Building is stupid, they will not repeat the investment in the same thing, so AT & T only

Can choose to use their existing technologies to break through the net locks of the Internet.

The power of the Internet has been noticed by many entry. The interests contained in this powerful thing have been noticed by AT & T.

They can't ignore this market.

And in a sense, they have more advantages than Catherine.

Optical fiber needs a dedicated broadband, but the AT & T plan is to use their already telephone lines to access the Internet.

Catherine is indeed aggressive, but AT & T is not completely defensive.

In fact, as long as they want to do, their advantages are greater than Catherine.

For AT & T, for a long time, the telecommunications users have been connected to the city exchange bureau through the user line of the "pairing and copper line" to enter the public exchange communication network.

(PSTN), connected to the other party's phone, enable the two parties to meet each other.

For the tradition, the traditional simulation telephone provides a frequency zone of 300 to 3400Hz. In order to adapt to the use of low -speed data communication to adapt to phone users, AT & T has tried to install the modem

S and highest 56K

S's data signal can communicate with the other party through analog audio band. This is the beginning of their Ji Ge.

Although there is no bandwidth limit one by one, they can't reach that level, but the switch in the communication network is limited.

The modem is transmitted, but the switch does not recognize that it is a data signal from the modem, but just treat it as a voice signal.

At the same time, at this time, AT & T also encountered the dilemma of the Internet in history.

That is, one "last mile".

The original intention of this word refers to the last mileage of a long journey, which is extended to complete the last and critical steps when it is completed (usually this step is full).

Refers to the connection between the computer room switches of communication service providers to the terminal equipment such as user computers. The users involved in the "last mile" refer to users who are in the network terminal status in the network terminal status in the "last mile".

It is not a large commercial user or professional communication company, so the line between connecting service providers and users will not be a single -mode fiber that is commonly used in Bone Qian.com.

The problem of wiring, because each user's room is different, communication service providers, real estate developers and users need to consider how to connect user equipment into the network according to the actual situation, how to migrate to other places, and how to cancel the user

Serve.

In this way, it caused a problem.

So what AT & T is thinking is a transmission mode similar to ADSL, which is part of the "digital" read by Catherine.

In fact, simply using the low -frequency part of the copper line with the traditional telephone line system. Their technological practicality is completely okay, but in that case, AT & T finds that if you do this, the system transmission speed of the system, the system's transmission speed

It is simply the difference.

The technology they use now uses DMT (discrete multi -audio) technology to bring the original phone line 40kHz to the 1.1MHz frequency band 256 frequency width of 4.3125kHz. Among them, the frequency band below 4kHz is in the transmission POTS (

Traditional telephone business), the frequency band of 20kHz to 138kHz is used to transmit signals, from 138kHz to 1.1MHz bands to transmit downward signals. DMT technology can be adjusted according to the line conditions of the line, so as to be sufficient

Land use lines. Generally speaking, the greater the signal -to -noise ratio of the sub -channel, the more bits and the number of bits and the modulated on the channel.

ps, down 8M

PS data transmission rate.

In other words, theoretically, it can provide a maximum of 3.5M without affecting normal telephone communication.

PS's upward speed and maximum 24M

PS's downward speed.

In other words, the download speed is up to 3MB

s.

Although it is the theoretical speed, this speed has been able to put Catherine's broadband down.

Through such DMT technology, AT & T can use the household line to avoid the narrowband switch, and it can become a "digital user line".

AT & T calls it DIGITAL-SU

SC

I

E

-Line, that is, dsl.

DSL technology supports symmetrical and non -symmetrical transmission modes on the user line of traditional telephone networks, which solves the problem of transmission bottlenecks that occur between network service providers and end users.

How to make full use of the existing steel cable resources and achieve high -speed access through copper twisted lines to become AT & T's next research focus.

But when the fake time, their technology will definitely be practical. At that time, Catherine was nothing.

This conclusion has to be a rejoicing news for AT & T.

... Just when AT & T was rejoicing, Catherine also arrived at the Thunder Lab.

Now that I can compare with Bell Labs in this world, only Thunder Lab.

But Catherine did not preach his plan at this time.

In fact, at this time, Catherine at this time, the new plan prepared by the Thunder Labs that was watching with interest here.

One by one is preparing to plan to develop a mechanical UPS power supply.

UPS (Uninte

upti

le-powww.piaotian.com), that is, uninterrupted power.

This is an uninterrupted power supply containing an energy storage device with a inverter as the main component. It is mainly used to provide uninterrupted power supply for single computers, computer network systems or other power electronic equipment.

When the city power input is normal, UPS supplys the city's electrical voltage pressure to the load. At this time, the UPS is an AC city electric stabilizer. At the same time, it also charges the battery in the machine.

At the time, UPS immediately continued to supply 110V AC power to negatively supplies the battery in the machine battery, so that the load maintained normal work and protected the load, and the hardware was not damaged.

Generally speaking, the supercomputer center needs to have a UPS power supply, so as to effectively protect the data of the data.

In the North American Computer Center, a series of UPS power supply is placed. These power supply -type UPS power supplies produced in general are the core of which.

These UPS can ensure that when the power failure occurs, the generator can be started in time to maintain the normal operation of the super computer.

But such a power storage UPS is not perfect.

So at this time, Thunder Lab is thinking about a solution that can perfectly solve things.

Here is now their conclusions of a mechanical battery.

That is the flywheel battery.

Before the use of batteries, the uninterrupted power supply once used flywheels and internal combustion engines to provide electrical energy supply to load. This uninterrupted power supply is called a flywheel or rotating uninterrupted power supply.

, Epolidation of flywheels, diesel engines (or gasoline engines) and generators. In the case of power supply power, the DC electric drive motor provided by the rectifier drives the flying wheel rotation, and the generator is powered by the load.

Keep a balanced, at this time, the uninterrupted power supply has the role of filtering power grid. When the power grid is broken, the flywheel continues to drive the rotor of the generator to rotate, and the diesel engine is started to drive the generator to generate electricity to replace the original power grid to supply power.

And now, this flywheel battery has been brought back again.

This is the new plan of the Thunder Lab ... According to the design of the Thunder Lab, there is a motor in the flywheel battery. When charging, the motor operates in the form of a motor. Driven by the external power supply, the motor drives the flywheel to rotate high -speed, that is, electricity is used to use electricity.

The "charging" of the flywheel battery increases the speed of the flywheel to increase its function; during discharge, the motor operates in the state of the generator. Under the drive of the flywheel, the external output power is completed to complete the conversion of mechanical energy (kinetic energy) to electrical energy.

When the flywheel battery is issued, the speed of the flywheel gradually decreases. The flywheel of the flywheel battery is operating in a vacuum environment, which is extremely high. "The bearing used is a non -contact magnetic bearing. In this way, the friction can be effectively reduced."

The technician really told her.

(Is this it used for the legendary magnetic suspension?) Catherine talked in his heart.

Catherine has also heard of the flywheel battery, but Catherine hasn't used it much.

In fact, Catherine has very little contact with UPS.

But this does not affect Catherine's prospects for this industry. Even if it is used by itself, this is enough.

So Catherine is very satisfied with this plan. "You can rest assured, I support it!"

She said that.

"It is not technical to be said ...