capacity, and modularization. The Quidway S8500 series has the following eight features.
1. advanced architecture
Quidway S8500 series products adopt a fully distributed architecture design. They use powerful ASIC chips for high-speed route searches and use Crossbar Technology for High-Speed Packet Exchange, this greatly improves the forwarding performance and scalability of the core route switch. The interface board connects multiple high-speed buses to the Crossbar exchange network on the two
technology through PSTN dialing; asynchronous connection uses communication cables to connect the RS-232 interface of poser with the asynchronous interface of Quidway router technology. The uplink part connected to the front-end server supports asynchronous connection and TCP/IP communication. Asynchronous connection uses communication cables to connect the asynchronous interface of Quidway router technology with the RS-232 interface of the front-end machine; TCP/IP communication means that the
PSTN dialing; asynchronous connection uses communication cables to connect the RS-232 interface of poser with the asynchronous interface of Quidway router technology. The uplink part connected to the front-end server supports asynchronous connection and TCP/IP communication. Asynchronous connection uses communication cables to connect the asynchronous interface of Quidway router technology with the RS-232 interface of the front-end machine; TCP/IP communication means that the Quidway router tec
public impedance between them, and its impedance coupling is restrained. The local decoupling capacitor is installed between the power terminal and the ground terminal of each integration piece, and is as close as possible to the Integration piece.
The decoupling capacitor between the Board refers to the capacitance between the power supply plane and the ground plane. It is the main source of decoupling current at high frequencies. The Inter-board capacitor can be increased by adding the area b
conditions and methods, therefore, both parties will clearly define the following items:
1. Test Data Source and format
2. Test conditions, such as voltage, current, insulation and connectivity
3. device production method and selection
4. Test chapter
5. Patch specifications
In the PCB Manufacturing Process, there are three phases that must be tested:
1. inner layer after Etching
2. After the outer line is Etching
3. Finished Products
Each stage usually has 2 ~ 3 tests of 100%, filtering out ba
Fence rails
Burch, kolstad, and schrijvers
Farmer John is trying to erect a fence und part of his field. he has decided on the shape of the fence and has even already installed the posts, but he's having a problem with the rails. the local lumber store has dropped off boards of varying lengths; Farmer John must create as much of the rails he needs from the supplied boards.
Of course, Farmer John can cut
thick, as long as the time is extended, suitable for bonding boards. the chances of e-gold potion waste are smaller than that of gold. however, the electric Fund requires full-board conduction, and is not suitable for very small lines. gold is usually very thin (less than 0.2 microns), the purity of gold is low. work fluid can only be discarded to a certain extent
The circuit board of a gold board has the following features:
1. the scalability of the
can see the essence through the floating cloud. dm9000 is a network device and should naturally have a structure related to this network device. How can we define it? You don't have to worry about it, because the Linux kernel has already been defined for us and can be used directly. It is struct net_device, so we know that although it is also a network card, however, they may be connected to different boards, such as Samsung
As long as you do business, you will earn money.
Note:1. I had this idea mainly because I recently sold several circuit boards and made several hundred yuan of quick money. I found that the money was too easy. I just chatted with people online, although I was not chatting with others, but they gave me money.
2. the major significance of doing business is to boldly open your pockets so that money can flow in easily. The truth is that if you don't tell
For embedded learning, we often have to deal with uboot and kernel,Source insightThat is, I think it is a very good source code viewing tool. For Viewing uboot and kernel source code, it has a very good indexing method and a very convenient shortcut key operation method. It is best to build a project to manage a huge source code tree. However, when you search for a keyword, many related files will appear, and different CPUs and boards will have files
); the essence of Motorola's PowerPC series PCB design
4); the essence of Intel's PC motherboard PCB design
5); Experience in PCB design for PC boards, industrial computer boards, and telecommunications equipment boards;
6) PCB design specifications and work processes of well-known communication companies in China;
7) requirements on the production and processing
Will you start the system? "If I ask you such a question, it will surely lead to a lot of bad eggs. But now I want to ask, "Do you know how many boot methods are available? "Certainly not many people can answer the question completely. In addition to power supply, you can press the power switch on the host panel to start the instance. There are also eight ways to start the instance. If you don't believe it, follow the objective s845e motherboard used by the author to test it!First: timed boot is
", next, select the "interrupt request" item in the list above, and then press the "change settings" button to bring up the "Edit interrupt request" window, where the interrupt is changed to an idle interrupt number. 1 {8fh * ey5' @ fxz. r5f n03. how to prevent interruption conflicts
(S | + f x! Vvxdo0 (1) install the board in a specific order
E + a8g E (a "mkbb) M0 do not install all boards in the system once. At first, only the minimum configurat
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Review conclusion
There is no contradiction between any of the above requirements and other requirements, that is to meet demand consistency requirements.
testable (testable): Each requirement can be tested by designing test cases or other validation methods.
Testability Review FormReviewer: car
Enhanced version 3041
Because the lawn cannot be covered by wooden boards, you need to deal with it more.
Since the wooden boards can only be placed horizontally or vertically, the first time the numbers of boards that can be placed horizontally and are not consecutive, and the second time the numbers of boards
Ubuntu8.10 will be released in 2008.10.31. I have been using Ubuntu 8.04 for three months. In fact, I am not very satisfied, but I just got used to it and don't want to change anything. Before the release of the new version, let me talk about the problem of Ubuntu8.04 and make a comparison later. 1. For some SATA interface boards? Hard disk? Poor support. Hard Disk cannot be found at the beginning of the installation. Some
, the development Board is more suitable for testing the program than the Fu machine, especially for the underlying Linux programs such as Linux drivers. Of course, the General Development Board can not be as beautiful and small as the Fu machine (although some large-screen fu machine does not look small, but still very pleasing to the eye), the Development Board of many circuits are exposed, looks like an integrated circuit board. There are many types and kinds of development
generates a game board to scroll down on top of the game area and push the number of its black part into the Locarr
function Drawboard () {
var temarr=generaterand ();//This applies a temporary location array, in order to prevent the position between the two game boards conflict.
Locarr=temarr.concat (Locarr);//connect the temporary array to the global location array
var board=document.createelement (' div ');
Board.setattribute (' id
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