coaxial multiplexer

trough again in charge of the way, that is, the ceiling inside the trough, and then go to the pipeline information export way;3) Ground-line groove mode, suitable for large bay and after partition.17, the fiber optic cable need to turn, the radius of curvature requirements? What about the coaxial coarse cable? Coaxial thin cable?The radius of curvature of optical cable cannot be less than 30cm.The radius o

. Laying optical fiber cables should not be twisted;B. The bending radius of the optical fiber cable must be greater than 30;C. Protection steel pipes should be added to the exposed parts of optical fiber cables, and steel pipes should be firmly fixed on the walls;D. PVC should be added when the optical fiber is worn in the underground pipeline;E. Indoor cabling of optical cables should be installed in cable Trough;F. The optical fiber laying should have a margin for expansion and contraction, a

Network Interconnection device lecture Network Interconnection device Overview When connecting a computer to a computer or workstation to a server, in addition to using the connection media, you also need some intermediary devices. What are the main intermediary devices? What role does it play? This is a concern in network design and implementation. We divide commonly used connection devices into the following types: I. network transmission media interconnection Device When a network line is con

(that's, run) application programs such as a Web browser program, and e-mail client program, or an E-mai L Server program.In this book, host = End system.Hosts is somnetimes further divided into the categories: clients and servers. Note, do not assume that the server is not a terminal or host, although they provide services (search engines, mailboxes, etc.), but for the internet, they are not different from other terminals, are running the application. Servers has a large data center on th

SC type, whether in the 100base-fx, or in the 1000BASE-FX network. SC interface Core in the connector, as shown in Fig. 3, is a 100BASE-FX network SC Fiber Interface module, the right image of a 4 sc fiber optic interface of the fiber switch. There are also 2 SC fibre interfaces in the switches shown in Figure 2. 　　 　 Figure Three 　　 From Figure 2 and Figure 3, the SC interface appearance of the switch shows that it is very similar to the RJ-45 interface, but the SC interface appears to be

-fx, or in the 1000BASE-FX network. SC interface Core in the connector, as shown in Fig. 3, is a 100BASE-FX network SC Fiber Interface module, the right image of a 4 sc fiber optic interface of the fiber switch. There are also 2 SC fibre interfaces in the switches shown in Figure 2.Figure Three From Figure 2 and Figure 3, the SC interface appearance of the switch shows that it is very similar to the RJ-45 interface, but the SC interface appears to be more flat and the gap is shallow. Mainly look

by efficient use of fiber and copper wire.The CATV is one of the representatives. In order to send TV programs, the coaxial line made of copper wire will be connected with CATV television station. Recently, Internet connections have started and applications have been made to local telephones, with more speed, more channels, and two-way communication. The coaxial axis is difficult to transmit high frequenc

method, will read to the content write to the buffer to save. Cases:Bytebuffer buffer = bytebuffer.allocate (n); Buffer.clear (); // resets the position to 0, sets the limit to capacity, and makes the buffer writable FileChannel New FileInputStream ("filename"//read from file channel writes to buffer3. Non-blocking IOThe Java.nio.channels package contains channel-related classes, which represent an I/O channel to a hardware device, file, network socket, and so on, and the channel is a bidi

I have had a Mercedes diagnostic machineMB STAR C3For a while and I decided to try and make it work, but every time I try to communicate with the car I get a error MESSAG E saying:Fault (1.1) -1.501.9504Initialization of diagnosis Multiplexer failed. Possible causes:the link between the diagnosis multiplexer and the diagnostic socket is interrupted. The link between the diagnosis

(image stretch, pixel format conversion)The Swscale class Library can convert the format of pixel data while stretching the size of the image.Example of use of Libswscale: The simplest example of FFmpeg-based Libswscale (YUV to RGB)In addition, this example comes with a program to generate a test picture: The simplest example attachment for FFmpeg-based libswscale: Test picture Generation toolProcessing of the 8.FFMPEG package format is done using FFmpeg for encapsulation format, mainly through

, poll, and Epoll are essentially synchronous I/O, first block a waiting socket, and block to copy data from the kernel to the user's memory.The differences between select, poll, and Epoll, such as the following table:1.10. Two I/O multiplexing modes: Reactor and ProactorIn both modes the event multiplexer feedback to the program information is not the same:The 1.Reactor mode shows that you can read and write (send and receive) operations.The 2.Proact

ChannelsWe read and write to the data through the channel, it is like a water pipe, is a channel. The channel differs from the flow where the channel is bidirectional and can be used for read, write, and simultaneous reading and writing operations.The channels of the underlying operating system are generally full-duplex, so full-duplex channel streams can better map the underlying operating system's APIs.There are two major types of channel: Selectablechannel: User network read/write

type, and its structure is this: struct Eventop { const char *name; void * (*init) (struct event_base *); Initializes Int (*add) (void *, struct event *); Register Event Int (*del) (void *, struct event *); Delete event int (*dispatch) (struct event_base *, void *, struct timeval *); Event distribution void (*dealloc) (struct event_base *, void *); Log off, Release resources /* Set if we need to reinitialize the event base /int need_reinit; Setting whether to reinitia

the difference between 1.BIO, NiO and AIO. BIO: A connection to a thread, the client has a connection request, the server side needs to start a thread to process. The thread overhead is large. Pseudo-Asynchronous IO: Put the request connection into the thread pool, one-to-many, but the thread is still a valuable resource. NIO: One thread is requested, but the connection requests sent by the client are registered to the multiplexer, and

This article describes how to test a network service program with internal logic by using test harness. The code for this article is shown in Http://code.google.com/p/muduo/source/browse/trunk/examples/multiplexer Download Address: http://muduo.googlecode.com/files/muduo-0.2.0-alpha.tar.gz SHA1 checksum: 75a09a82f96b583004876e95105c679e64c95715 Cloud Wind in his blog mentioned the game to connect the server's functional requirements (search "practi

exchange speed, reduce costs and improve reliability. In an ideal all-optical network, all functions of signal exchange, route selection, transmission and recovery are all in the form of light. At present, all optical network is not the whole network optical, but refers to the optical information flow in the transmission and exchange process in the form of light, with the circuit method to achieve the control part. From the current situation and development trend of optical electronic componen

In the fully transparent networking scheme using IP network or leased line to realize voice switch, in addition to adopting the most advanced signaling system, the built-in voice compression platform and its IP network voice are integrated in the switching system. VOIP Technology and Gateway technology are the key to achieve high quality voice communication. The built-in speech compression technology provides a new set of solutions for the connections between nodes, and can reduce the communic

-based package format processing: AV Splitter (demuxer)AV multiplexer (muxer): The simplest ffmpeg-based package format processing: AV multiplexer (muxer)9.FFmpeg Streaming Media applicationsThe use of ffmpeg for streaming media applications, mainly the transmission and reception of streaming media.Articles directly using the Ffmpeg.exe command line tool:ffmpeg command to send streaming media (udp,rtp,rtmp)

information from the hard diskFor example, through the read command , called an IO operation , an io is completed , an io is not completed , blocking keyboard io, disk io is complete ,This process is also unable to respond, because the keyboard IO is not finished , still blocking , the process is still asleep , this time what to do ?This requires I/O multiplexing.Execution processAfter the process in the call io , not directly call io function , in the system kernel , a new system call , The

stretching the size of the image.Example of use of Libswscale: The simplest example of FFmpeg-based Libswscale (YUV to RGB)In addition, this example comes with a program to generate a test picture: The simplest example attachment for FFmpeg-based libswscale: Test picture Generation toolProcessing of the 8.FFMPEG package format is done using FFmpeg for encapsulation format, mainly through Avformat. There are 3 examples of processing of encapsulation formats:Encapsulated Format Converter: The sim