IPhone4S

IPhone4S is an updated version of iPhone4 (" 4S" is" for Steve" another view is the English abbreviation of "Speed" ). In October 4, 2011 by Apple 's new CEO Tim Cook in the 2011 autumn apple products conference.

On October 14th in 7 countries ( the United States, Canada, Australia, France, Germany, Japan, UK) listed. In October 28th 22 other countries and regions released. At the end of 12 of 70 countries in the global market, the list is not clear!

When can you buy iPhone4S? October 4th in the above 7 countries listed are basically a version of the. According to the iPhone4 experience, likely in Canada, Australia, England the three countries will have no lock version, but the news is not clear! It is understood, because the white version of the iPhone 4 white shell in the use of flash will affect the camera performance, and this problem in a previously has been unable to solve, so repeatedly postponed the launch of iPhone 4 white. Now, through the use of a new paint, this problem can be solved, so iPhone 4S can publish.

On October 5th, 10 a.m. local time on October 4th ( Beijing time on October 5th at 1 a.m. in the United States California headquarters ) apple press conference, Apple 's new CEO Tim Cook first hosted major product launches, officially launched a new generation of iPhone -- iPhone 4S. IPhone 4S will also have black and white colors for two years a contract price of $199, 16G 32G 64G, $299, $399. October 14th will be officially on sale.

Compared with iPhone4, iPhone 4S in appearance without much change, antenna design has changed. IPhone 4S in the iPhone4 based on the configuration has been upgraded, with A5 dual-core processor and dual core of the show, CPU speed is about two times iPhone4, graphics performance is 7 times iPhone4. IPhone 4S battery capacity. The mobile phone in the 3G network communication time can reach 8 hours, access time to reach 6 hours, watching 10 hours of video, listen to 40 hours of music.

IPhone 4S HSDPA support network, download speeds of up to 14.4Mbps, iPhone 4 with GSM and CDMA two versions, iPhone 4S supports both GSM and CDMA. Also is can directly cut good telecommunications card inserted into the card slot, can be a normal search to signal.

In addition, iPhone 4S is equipped with a 8000000 pixel back-illuminated camera, light through rate increased 73%, maximum aperture of F2.4, it can take 3264 x 2448 pixels of the image, combined with iOS on camera function camera effects can be enhanced, and the general card machine is comparable, and after iPhone4 has been Flickr 's most popular photo equipment. In addition iPhone 4S camera also supports 1080p HD video recording, and has the picture stabilizing system and real-time noise suppression function.

IPhone 4S with Apple's new iOS5 operating system, support for iCloud cloud services, the biggest feature is the voice control, voice system based on Siri, the iPhone 4S will become more intelligent speech recognition device, and iPhone 4S through voice control weather, SMS, map search function.

Other features include a new iOS5 notification center, iMessage instant communication function of newspapers and magazines, Newsstand, Reminders reminders, optimized Twitter, through the optimization of photo and photo editing features, upgrade the Safari browser, without the need to connect computer activation, through the optimization function of the message, the more powerful Game Center, powerful notification center.

With the release of iPhone 4S, the old iPhone also undertake the price is adjusted, the iPhone 4 8G version of a contract price of $99, while iPhone 3GS 8G edition contracted price is zero.

Prior to apple to the media issued the invitation theme for" Lets talk iPhone" ( about iPhone ), means that a new generation of iPhone will be at the conference to launch, including Calendar, Clock, Maps and Phone icon hints at this conference possible launch of new products and services

Gigabit Switch

Many people looking for more rapid LAN connection technology, using Gigabit Ethernet or faster million trillion technology. This change is not just happened in the campus network backbone, also occur in every closet, enterprise IT management staff hope for every desktop users 10 times in the previous network connection.

Gigabit switch.

Selection for many reasons, understanding is the selection of the foundation. You understand the Gigabit Ethernet switch? In this period the switch magazine, we choose such a proposition, hoping to take you into the Gigabit switches have a look inside, how it works, how to form, why to have so different, and so on. With the settlement of these problems, the product of your choice will be more strong.

Gigabit switch type

Equipment manufacturers in the design of the switch, usually through different settings to meet customer demand, these requirements are typically include the following:

1 can be stacked to obtain full scalability;

2 can pass through the machine frame structure is obtained by elastic backbone expansion capability;

3 and the server can equipment integration, to achieve the calculation and network integration;

4 small and medium enterprises will require a fixed port or may work independently switch; 5 not for the IT Department small company, blame management equipment will be more popular.

There are some other requirements, such as reducing the design, production and assembly cost. Many of these demands are contradictory, but they are also real. To satisfy their way through different types of switches product to achieve, and the continuous progress of the semiconductor technology makes the switch design and manufacturing has entered the high modularization and integration phase, to design different types of switches and provides technical convenience. Here, we show different types of switches by its design principle and system structure, to help you decide what kind of switch is you really need.

Stackable switch

These switches are often used to connect users to the high speed campus network backbone. Usually, some of them are called high-speed" user" port, and has strong expansibility. When data from these ports collect, from high speed data interchange road passes out, in order to achieve and the center server, IP PBX and other equipment data exchange. Stackable switches are usually placed in the closet or in the engine room, it can be adapted to the growth of network. If a new user to join the network, the administrator simply in the original equipment placed above a new device, and then through an external " stacked" interface all the switches connect. In fact, this is your own and the development of a new, larger switches, can be conveniently and the original switch managed together, just a capacity increased.

There is a high speed stacking stackable switch port is the basic characteristic of.

Machine frame type switch

This type of switch used in the high performance network backbone layer. The system has a lot of slots, can be used to insert a lot of redundant network interface card, includes a system bus, power supply, security module. The whole system can be set to high redundancy system, in uncontrolled disaster or failure can still provide the available network services. Performance is a machine frame type equipment important indicators, but more important is the system of high reliability and high availability. Its failure rate is usually required in the average annual overhaul time of less than 5 minutes.

If the figure 2 stackable switches on the stacking port connected with a larger exchange capacity switching array chip switch backplane, and redundant power supply and management module design, constitute a core of the machine frame type switch. High speed switching array chip structure as shown in figure 3.

Independent ( fixed port ) switch

This is the most common switch, it for growth-oriented enterprises to provide cheap network solutions. The system has a fixed interface ( not expanded ), when the growth of enterprises need to expand the switch port number, a network administrator must buy some switches.

In general, the switch structure and a general computer very similar. The switch has its own CPU, memory, external memory FLASH ( functionally similar computer hard disk ), start memory (similar to the computer's BIOS ) as well as the importance of the exchange chip and a network interface chip ( similar to a computer network card ).

General computer is different, network interface chip after receiving the data, most of it through the exchange chip implementation of storing and forwarding operation, not the system through the CPU, the above mentioned independent ( fixed port ) switches and unmanaged switch is one such structure. The difference is, the independent ( fixed port ) switch just in port extended slightly lost in more advanced switches, but depending on the design, the system can be used in very advanced CPU and large amounts of memory. Such a multilayer switch can be used by system CPU to handle such as routing, network security strategy, the realization of advanced network applications. Many switches use the common CPU, certainly not our common Intel, but like the Motorola MPC8245 or MIPS RISC chip.

BCM5464

It is a 4 port Gigabit transceiver with integrated electrical signals, copper / fiber medium interface. This is what we called a network interface chip, it needs and fiber optic or copper physical layer device ( PHY ) to work together, constitute the original signal receiving interface ethernet. Then, it upward and a 12 port Gigabit Ethernet exchange chip connection, three BCM5464 passed to 12 Gigabit signals in exchange chip BCM5691 completion of the exchange, the exchange chip, will establish corresponding MAC learning mechanism and the mapping table, and then through the corresponding BCM5464 forwarded to destination port.

Can not be managed switches, because demand is more simple, so the design can use less memory and less energy consumption, lower cost of CPU, common ARM kernel CPU. This simple design is just to start system, simple control instructions to download exchange chip, unable to complete the high-level exchange.

Three kinds of instruments to create man sexy

Not because the men's beauty by muscular man impress excitedly talking about this topic, just as the TV play is often said, a broad mind to ladies are always hard to resist, so, who to take pectoral muscle exercise fitness center is the popular.

Barbell -- pectoral muscle thickness

Want to increase the muscle mass, barbell exercise is the most important, the most basic exercises. Total senior instructor to coach suggested the beginner will barbell exercises in the first step, because the barbell exercise action is relatively small, so must be from different angles ( up and down-ramping ), using different grip stimuli across the chest muscles. Relatively simple safety practice is flat barbell bench press, can effectively exercise the chest, increasing the thickness of. To lie on the bench stool, feet naturally placed on the ground, then adjust the body of front and rear position, make eyes at the bench frame just below the barbell. Grip a bit wider than the shoulder, from the bench press shelf barbell barbell, slow down, until the upper arm and parallel to the ground. Repeat the exercise three or four groups, each group or 12-15 European push action, specific depending on personal physical conditions. After skilled, can do decline bench press, focus on training of the chest muscles, strengthen the operation difficulty slightly.

Dumbbell -- chest width

Dumbbell exercise barbell exercises more than the balance and coordination to control weight, the larger movements, therefore can be fully stretched muscles, have broad mind. The usual training movement in two, flat dumbbell bench press and flat dumbbell flyes. The former is lying in the training stool, his hands holding a dumbbell. Stretched arms, the dumbbells, palm relative, slow down until the upper arm dumbbell in parallel with the ground, and then boost the dumbbell to return to the starting position, so to repeat. The so-called dumbbell flying bird is lying in the training stool, his hands holding a dumbbell lift, palm relative, open arms, along a circular trajectory to the sides of the body slow down dumbbells, until the upper arm and parallel to the ground, then backtrack. The two group of sports should pay attention to in the process of pushing, ensure that the vertical push dumbbell, not deviation. To the coach reminded of beginners the best please people aside protection, avoid incoordination when injury to muscle. Dumbbell exercises there is a benefit, is can be performed to coach suggested whenever and wherever possible, usually at home can also be a mirror to practice, and can correct action, one can appreciate their own results.

Chest clip machine -- pectoral muscle separation degree

This equipment is designed for practising pectoral muscle separating degree, and the other at home exercise chest muscle than methods, this instrument effect with very strong specific aim. In practice, the back must be close to the backrest, when forced by the elbow forced. As a result of hip, back to back, so only the chest muscles can use energetically. In this exercise equipment, the effect of 95% of the pectoralis major muscle, and the exercises on other parts of the body will not cause any harm.

To complete the task of the breast is important, but not greedy of rash, pay attention to each training time control in about 45 minutes, adhere to a week into a gym, with a balanced diet, probably two months can be achieved.

TV out

TV out is a video card with output signal to a television related interface. TV output interface is currently mainly used to have three kinds. Using a VGA interface, VGA interface is the most cards have the interface type, but this requires TV with VGA interface can be achieved. Another is the composite video interface. Composite video interface uses RCA interface, RCA interface is currently the most widely used television equipment interface, almost every TV provides the interface, for video input. The last one is the most widely used, the output effect better S terminal interface.

At present, ordinary household display size does not exceed 19 inches, compared to the TV display screen size is much smaller, especially in the movie, play game, larger screen can give a strong visual enjoyment. While the larger displays the price of an ordinary user can bear, the display image is output to the television, it has become a good choice. TV output interface is currently mainly used to have three kinds. Using a VGA interface, VGA interface is the most cards have the interface type, but this requires TV with VGA interface can be achieved, with this interface is relatively less television, at the same time is a few more expensive products, popularity rate is not high. This method is generally not used, nor the people used to sense the video output. Another is the composite video interface. Composite video interface uses RCA interface, RCA interface is currently the most widely used television equipment interface, almost every TV provides the interface, for video input. Although the AV interface to realize the separation of transmission of audio and video, which avoided because the audio / video mixing interference caused the deterioration of the image quality, but because the AV interface transmission is still a luminance / chrominance ( Y / C ) mixed with the video signals, still need to display the luma / chroma separation and chroma decoder to imaging, the first hybrid separation process will result in loss of color signal, the chrominance signal and the luminance signal is also a great chance to interfere with each other, thus affecting the final output image quality. Using the AV interface to output the video card output effect is not very ideal, but it is on TV with interface, thus the interface by the user's favorite. At present, the output interface card products less, most provide output effect better S terminal interface. The last one is the most widely used, the output effect better S terminal interface.