Thursday, October 14, 2010

Where VoIP save money?


VoIP to save money, which everyone knows. Now and save money as long as the things it did not doubt its prevalence. But the key is, VoIP is where to save money in the end. In the IT industry, we are accustomed to some "senior" term - the deployment of VoIP in the total cost of ownership (TCO) How?

Sonus Networks has recently done a very interesting thing, in order to specifically show the cost-effectiveness advantages of VoIP, the company has a 60,000-port voice packet switch with 100,000 ports multiplexing (TDM) circuit switches for TCO detailed appraisal.

1 100 000-port TDM switch has 60,000 access ports and 40,000 IMT port, price of 6.5 to 15 million U.S. dollars. A 60 000-port voice packet switch is also able to provide 60,000 access ports, and ports are not limited to IMT, the price is only 3 to 4.5 million U.S. dollars. Look international network connectivity, many manufacturers this feature TDM switches to form an independent platform, its price is twice the local switch platform, the price per port of about 175-200 U.S. dollars, while the voice packet switch just the same platform can also support local and international IP information transmission.

On average, a 100,000-port TDM switch with peripheral equipment, the cost of its electrical equipment and installation cost of about from 900,000 to 1,600,000 U.S. dollars, the initial voice packet switch input electrical equipment and recurrent expenditure on electricity than the TDM equipment can save 80-90%. In addition, the voice packet switch can also be significant savings in office space.

TCO There are many potential cost factors, including peripheral equipment, reliability and service life of the switch, VoIP systems have a considerable advantage. And deployment time is relatively short, the operational needs of field staff with a more streamlined team also estimated that VoIP switching solutions in the field operating expenditure savings of 80%.

Carefully calculate, from beginning to end, VoIP is really a lot of places to save money. In my view, the domestic users, there is a link can improve the TCO, it is the best use. VoIP platform offers many value-added feature, if the user can take advantages of these features, then your investment even more cost-effective VoIP has.






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Sunday, October 10, 2010

Sober.P worm rampant total 5.4 percent of total e-mail


According to anti-virus firm Sophos, said the spread of the Internet over the past number of Sober.P worm.

Sophos said, Sober.P worm accounts for its monitoring of e-mail over the weekend total of 5.4%, 84% of virus attacks. Sophos arrived at last Friday when these two figures were 4.65% and 77%. P> Sophos senior technology consultant Graham Cluley said, It is strange that we receive more than the previous report Sober.P worm. Sober.P increase the number of worms, the situation is worse than last week. We do not know how many users were infected with Sober.P worm, an infected user is sending a large number of infected messages.

Cluley said that the second most popular e-mail virus is Netsky.P, which accounted for 0.3% of virus attacks; the third most prevalent virus was Zafi.D, all the virus attacks only 0.08% . He said the virus in the past were all famous, but it pales in comparison with the Sober worm was.

Last week, Sophos said, Sober.P worm can shut down the infected computer, Symantec anti-virus software and firewall in Windows XP. Sober.P disguised written in English and German e-mail attachments, the e-mail using free World Cup tickets lure users to click on the attachment.

After the user clicks the attachment, Sober.P itself will be sent to the infected computer from the collection of e-mail address.






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Thursday, September 23, 2010

Year season: how to make cash "flow up"



Went to the New Year season of collection, and unlike previous years, the global economic crisis, wind burst Jinsi a while, making this year the winter, whether manufacturers or channel, everyone's nerves are stretched too especially tense, industrialists, from Alibaba , Huawei, Lenovo, China Vanke these well-known companies, are busy "misappropriating" even "Guo Zihao" the China Ocean, hoarding in the hands of 360 million in cash, for small and medium enterprises, the end of the year for cash flow The "looting" the intensity is conceivable; and channels, but also its own channels, "the words Scriptures" measures - no purchase, raw materials are now the fall anyway, you do not cut prices, sooner or later there is another price reduction I just put the cash in hand for the trip.

One side is the factory to "Tuen food," the other side is channel would not "cross grain", the makers of the seemingly irreconcilable contradictions, you really did not solve the road?

The key cash flow is a "flow" character, as long as the cash can flow up, manufacturers and channels can actually make profits on; the key is how to break the current stalemate between the parties predicament, so that channel, "obediently" the cash to you? Consider three strategies "crack tips":

Break one of the secrets: a large fortune quietly muffled

In 2008, some manufacturers can be said that from the end of the first to have complained to the channel of water, in the first half told the channel, its upstream raw material has gone up by so many; in the second half told Channel: We have entered the number of how much expensive raw materials, now must be slowly digested and so on. These words may be said is true, but in the channel to listen to a completely different flavor: the former is simply to say "sorry, we have to price increases," and the latter said, "Sorry, I have to wait digest Stock price cuts after "Therefore, such" grievances "Even if the channel is not listening to surface attack, it is actually anything in the fire, and manufacturers of communication envisaged effects difference between the cry. In fact, the manufacturers the best solution is to channel the Church, "quietly, muffled large fortune."

How to understand what this mean? Just mentioned, the factory kept the prices of raw materials to their state to the channel said, is a very sensible approach, especially in the current price-cutting cycle, the channel that your raw material prices once a can fallen by a thousand months, he dared to purchase strange! the channel if you do not know the situation on the factory price cuts made correspondingly, will not so strong concerns at the time of purchase, will not so much .

Some people might say: Now a variety of pricing information are transparent, how can I cover up is maintained? To remember: We do not want you to cover up, but you go to church sources, the end users learn to "quietly" as consumers and manufacturers and channels of thinking are very different in fact, manufacturers and channels of thought is the focus of "benefit" of cargo hold in the hand is to replace the lost cash, so for the price of an extra little sign of trouble care; and consumers to buy things back to "use" to realize the value the product itself, except for real estate investment goods such as addition, they are basically not interested, nor so many efforts to study the production of each costs rise and fall, in other words, consumers have a "price sensitive" one of the lowest group.

One example: in the first half newsprint prices soaring, the domestic retail prices up more than newspapers, with an average increase of 40% - 100%, while the second half of market downturn, nearly 20% price cut newsprint, Beijing, Shanghai, Tianjin and other places recycling old newspapers from the September price is 2 yuan per kilogram in November slumped to about 0.4 yuan to 0.5 yuan / kg, but to date there is no domestic newspapers announced that 2009 will be a price cut, why? because the newspaper In the "muffled fortune," they will not tell readers have cut prices at all, in fact, even know, most readers simply will not care. In this way, the newspaper will not consider price cuts.

Therefore, the current channels, there is no need to give birth to so many concerns, because your end users will not like you did the factory owners, fixing authorities merely to ask lower prices. As manufacturers, should explain this reason in layman's language to the channel: Since today is still able to a relatively high price of the goods sold to customers, why should they waited in vain for lower prices, lost their profit margin? If the channel can provide us to his idea to think about this issue, they will behave in purchasing a more positive side, manufacturers at the time of year is also a guarantee of cash flow.

Crack tips for two: the main push middle and low product

Year repatriating their capital, are you going to push what the main channel of delivery? If the answer is "the main push in the high-end products", my answer is: you will die miserable.

"Product upgrades" is a cliche, the problem is that such ideas are not always correct.

This year's "11" period, Taobao's transaction volume nearly 300 million yuan per day, up 200% over last year; stark contrast: Beijing, Shanghai, sales of traditional department stores in 10 After the sharp decline in the month, some 30% decline. The two sets of data indicate? Help consumers are now more inclined to buy "bargains", who originally manufacturers the product structure in the table out of the list of middle and low product, it may be now, or even straw in 2009!

There is no doubt that middle and low product will once again usher in their golden age, the recent period, selling prices of around 2,000 yuan in the 32-inch LCD TV is one of the most typical example. Manufacturers want the channels to purchase at this stage, must be popular in the middle and low product should mainly be able to speed up the repayment of funds, the "panic" to more cash;

From the channel perspective, it should seize the opportunity at this time, using high frequency, small quantities of purchase method of making real profits; some agents indulge in "Chibidaigou" and other price cuts, in fact, even if few more months until the price cuts, you still could have lost by several rounds of purchase - sales and their profits, so this method is not advisable. What we need is tangible real income, rather than the elusive and the "paper gain."

Crack the secret of three: a bold attack contrarian investment

Stocks of the master know that the key to winning stock market contrarian thinking, according to Buffett's famous quote, "When the people fear greed, greedy when others fear", only win. This statement can also apply to our new channel development: a time like this, you still dare to investment? Most people the answer must be negative. That being the case, few companies dare to attack at this time, there may be successfully "seized" large sums of cash income.

At present, many industry downturn, the dealer groups, is "the people wanted change," the occasion, financial turmoil, unemployment "returnees" part of the high-income groups, there are business needs, the State Council issued on September 28 subsolar "On the promotion of entrepreneurship to improve employment guidance work", has just concluded Central Economic Work Conference which takes capital growth, promote employment as the focus for next year can be said that Cishi to start Xiangmu investment, Duiyu manufacturers who, is occupied the weather, geography, and, as long as the proper strategy, it seems ridiculous not a truth?

In the current investment under such circumstances, the success of cross-industry select agents more likely, because in fact present in all sectors there is a "Fortress Besieged" effect, always feel that to do other industries, the day be better than yourself. Therefore more willing to cross to select the manufacturer of investment projects. Petrochemical industry at present is to conduct high-profile investment of Lung Poon lubricants, for example, the development of new clients, from the pharmaceutical, cosmetic, and household appliance industries the agency to account for a large proportion of these new agents to join providers, channel structure for the enterprise has brought new blood, new thinking, if we can successfully grow, manufacturers will be an important response to economic downturn next year, "magic weapon" and, of course, its success to support the premise that early manufacturers and training must be in place .

"Fight for the cash" is undoubtedly the major manufacturers end of the year-end loudest slogan, but the final analysis, the channel Ye Hao, consumers might, in fact, should the interests of our community of manufacturers, there is no need to regard as "enemies." To acquire the above three tips, manufacturers and channels can be in the bargain, the small fraction of "gunpowder", and the more sort of "join hands" and "partner feeling."







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Wednesday, July 28, 2010

Cheap difference between switch and hub



Some users have recently seen a message that the article to buy according to our networking products, businesses that have switches and hubs, switches more expensive, cheaper hubs, then the two products because they do not know what difference, it is feared by business fraud, they can not make a decision.

For this problem, we will for everyone from the technical and practical aspects on analysis of the low-end switches (in the high-end switches for large-scale professional networking) and the hub of the differences:

Start with the technical analysis:

We now use the methods of work adopted Ethernet is CSMA / CD (Carrier Sense Multiple Access / Collision Detection), the sender, it sends a data message for each, the first monitor on the network, when it detects line just free, they immediately send data, or to continue testing until the line is idle and then send. For the receiver, the received signal first to confirm, if it is issued to own the reception, otherwise ignore. Thus, the data transmission network exists to share and exchange these two concepts - shared management of the network is a non-working state to ease the disorder, each client will be possible to seize the communication channel, so a few clients the time to seize the channel with the formation of network congestion on the situation, when the data and the number of users exceeds a certain limit, they will cause the network performance of a deep recession. The switching network is to avoid the lack of shared networks, the role of the exchange of technology transfer is based on the packet destination address, independently of each packet sent to destination port from the port to avoid collision with other ports, increase the actual throughput of the network.

Shared Ethernet, the main problems is that all users share the bandwidth, the actual available bandwidth for each user with the network reduced the number of users increases. This is because when information is busy, the number of users may be linked into the "race" a channel and a channel at a time occupied only allow one user, so a lot of regular monitoring of wait state is a result, the signal transmission produce jitter, stagnation or distortion, seriously affected the performance of the network. Switched Ethernet, the switch supplies the user-specific information for each channel, unless both the source port information while trying to send to the same destination port, or each individual source port and destination port for communication between not occur simultaneously conflict.

Therefore, the hub is a shared work with the state of the equipment, since it is relatively easy to implement, so the prices are cheaper hubs, of course, deficiencies in speed will be difficult to avoid; while the switch is using switched technology, equipment, technical content higher than the hub, of course, also more expensive the price, but the switch can overcome the shortcomings of network congestion.

To sum up so to speak:

All ports on the hub of a shared channel contention bandwidth, so as to increase the number of network nodes, data traffic increases, the available bandwidth per node will be reduced. Hub in the form of transfer data by radio to all its ports to transmit data.

All ports on the switch are exclusive channel bandwidth to each port to ensure fast and efficient data transfer. Switch is to provide users with exclusive, point to point connection, the packets are only sent to the destination port, and will not send to all ports.

Hub is a shared device, itself can not identify the destination address, of that same period of a host to a web host to send data O'clock b Packets Yi hub Wei structure of the network in Guangbofangshi Chuan Shu, You each terminal by Taiwan Verify header information to determine whether the address to receive the same time the network can only transmit a data frame of the communication. This means shared bandwidth.

Switch based on mac address recognition, to complete the package forwarding data-enabled devices. Switches can learn mac address on the internal address table, the data frame through the origin and the recipient of the switching path between the interim, the data from the source address to destination address.

After reading the above, we should understand why some businesses will directly tell you "faster switches, hubs slow" (the argument is easy to understand it).

Let us go from the application of:

As the hub can not overcome a large amount of data and multi-user when the plug issue, so it can not connect too many clients at the same time we typically see in the market, many dozens of pieces of the hub are five of the ( previous 16 Internet cafe hub is also very popular, but now have been replaced by a switch), and only 10M; the switch 5 or 8 have (24 in all, but home prices are more expensive and really nothing necessary ), 10/100M speed are basically adaptive.

So after you see the article inside another switch or hub that can be used, then the best choice switch it, although a little expensive, but it is really easy to use than many of the hub.







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Wednesday, July 21, 2010

JPA entities of state and API



Entity object has the following four states, these states occur by calling the EntityManager interface method of migration:

New state: the newly created entity object, yet have persistent primary key, and a persistence context does not associate. Controlled state: already have a persistent primary key and and the persistence context to establish a link; free State: have a persistent primary key, but not yet, and persistence context to establish contacts; delete state: has a persistent primary key has been, and persistence context to establish contacts However, arrangements have been deleted from the database.

The API EntityManager

Here are some of the main interface EntityManager methods:

void persist (Object entity)

By calling the EntityManager's persist () method, the new entity instance will be converted to control. This means that when the persist () method where the transaction commits, the entity data will be saved to the database. If the entity has been persistent, then the call to persist () operation does not occur anything. If an entity has been removed calls persist () operation to remove into another state entity controlled state. If the implementation of free-like entities persist () operation will throw IllegalArgumentException.

In an entity called persist () operation will be broadcast to the associated entities and entities on the implementation of the corresponding cascade persistence operations;

void remove (Object entity)

By calling remove () method to remove a controlled entity. If the entity declared as a cascading delete (cascade = REMOVE or cascade = ALL), was associated entities will be deleted. In a new state of the entity called remove () operation will be ignored. If the free entity called remove () operation throws IllegalArgumentException, related to the transaction will be rolled back. If the entity has been removed to perform remove () operation will be ignored;

void flush ()

The controlled state of the entity data synchronization to the database;

T merge (T entity)

A free state of the entity persistence to the database, and converted into a controlled state of the entity;

T find (Class entityClass, Object primaryKey)

To the primary key query entity objects, entityClass is the entity class, primaryKey is the primary key value, such as the following code to query entities Topic:

Topic t = em.find (Topic.class, 1);

Query createQuery (String qlString)

According to JPA's query to create a query object Query, such as the following code:



Query q = em.createQuery ("" SELECT t FROM Topic tWHERE t.topicTitle LIKE: topicTitle ")"); Query createNativeQuery (String sqlString) using a local database SQL statements to create a Query object, Query by getResultList () Method of implementation of the query, returns a List result set, each row of data corresponds to a Vector.
Query

JPA represents a query interface, using javax.persistence.Query instance, Query instance from the EntityManager query by specifying the building. This interface has many methods to perform data query interface:

Object getSingleResult (): implementation of the SELECT query and returns a result;

List getResultList (): implementation of the SELECT query and return multiple results;

Query setParameter (int position, Object value): binding by position number parameter in the parameter query, if the query using the command parameter, you can use Query setParameter (String name, Object value) method of binding named parameters;

Query setMaxResults (int maxResult): Set the maximum number of results returned;

int executeUpdate (): If the query is to add, delete, or change the statement, by the method of implementation of the update operation.







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Monday, July 5, 2010

Youtube to QuickTime Utility

Hot popluar youtube video Converter + download + player tool. With YouTube tool you can also convert downloaded YouTube videos to a format compatible with your favorite portable device; including - iPod Video, iPod Touch, iPod Nano, iPhone, Zune, PSP, as well as video capable MP3 players, video capable mobile phones, and Pocket PC, And finally... YouTube tool's embedded player will allow you to watch all your favorite YouTube videos off-line. So now you can enjoy any .flv and .swf videos anytime!
Easily Convert all popular video formats. Provides the highest speed to download YouTube video. Support unlimited simultaneous downloading tasks. Supports auto-name your downloaded video title as the YoutTube page shows. Offers you the most convenient task management and the easiest control capability. About Conversion Features. - is the most powerful YouTube assistant on the planet.



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Friday, June 25, 2010

Youtube to MOV Guide

Hot popluar youtube video Converter + download + player tool. With YouTube tool you can also convert downloaded YouTube videos to a format compatible with your favorite portable device; including - iPod Video, iPod Touch, iPod Nano, iPhone, Zune, PSP, as well as video capable MP3 players, video capable mobile phones, and Pocket PC, And finally... YouTube tool's embedded player will allow you to watch all your favorite YouTube videos off-line. So now you can enjoy any .flv and .swf videos anytime!
Supports YouTube video or any .flv and .swf file as input file. Supports not only YouTube video, but also various video formats as input file, including avi, DivX, XviD, rm, rmvb, MOV, MPEG, WMV. Supports a wide variety of output file format., including avi, DivX, XviD, rm, rmvb, MOV, MPEG, WMV. Provides various profiles, these profiles can meet the needs of most people. - is the most powerful YouTube assistant on the planet.



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