cwdm multiplexer

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Summary FFmpeg Video Audio Codec 0 Basic Learning Method--turn

(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

Java NIO Learning

, 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

Java Network IO Programming Summary (BIO, NIO, AIO all with full instance code)

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

An analysis of the event processing framework of Libevent

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

"Face Test" Netty related

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

Muduo Network Programming Example (vii) "string and transform" connection server and its automation test

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

Optical switching/Optical route casting All-Optical Network

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

Voice compression and IP online voice (VoIP) technology

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

Intelligent Ethernet Switching Technology

DWDM/CWDM interface to work with optical transmission. The performance was constantly improved. It supports RPR networking technology, MPLS, and fast Spanning Tree Protocol, the integrated data, voice, and video services that can be managed and Intelligently Based on the IP platform will be gradually implemented, qoS, security, content distribution, MPLS, and other business features and solutions support will be the ultimate direction of Ethernet dev

Technical basis of the access network: view the construction and development of the Internet

through Multi-Service Access Platform-that is, using MSAP (Multi-Service Access Platform) product Series and integrated network management platform to achieve four types of integration: Business integration: In addition to meeting the access needs of user voice, video, industry applications, OA, Internet, and other businesses, it can also provide channels for the increasing 3G businesses, helps achieve rapid deployment of 3G networks; Technology Convergence: MSAP provides PCM, PDH, SDH, Etherne

How to select proper optical fiber for the data center

"Water peaks", the entire band from 1, 260nm to 1, 620nm can be used, and through the use of economical and practical coarse Wavelength Division Multiplexing (CWDM) technology, data transmission rate can be expanded in the future and other services can be provided. When the data center needs to be quickly configured or reconfigured, The SYSTIMAXInstaPATCHPlus system is undoubtedly the best choice. It has the features of high density, factory connecti

Java IO------------------BIO (synchronous blocking), NIO1.0 (multiplexed), NIO2.0 (AIO, non-blocking)

multiple status bits that can be identified by selectorBuffer (buffer):A buffer is an area of memory (an array) that is wrapped in NiO as a buffer object. Buffer provides methods to access the memory.In bio, data is stored in a stream, and in NiO, the data is stored in a buffer.In addition to the Boolean other Java seven basic types have the corresponding buffer class. Most commonly used is the BytebufferSelector (multiplexer): Responsible for pollin

Turn: How the Linux daemon starts

any input, even if it is running in the foreground. REDIRECT standard output and standard error to file nohup.out . In other words, the nohup command actually separates the child process from the session it is in.Note that the nohup command does not automatically turn the process into a "background task", so you must add a symbol.Seven, screen command and Tmux commandAnother idea is to use the terminal multiplexer (Terminal

Java Network IO Programming Summary

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 FileChannel: For file operations The Serversocketchannel and socketchannel that are involved in the following code are subclasses of Selectablechannel.2.4. Multiplexer SelectorSelector is the basis for Java NIO programming.Sel

Netty Learning Notes (i)

is that when a connection is created, it does not need to correspond to a thread, this connection will be registered on the multiplexer, so all the connections need only one thread can be done, when the multiplexer in this thread polling, found the connection on the request to open a thread to handle, That is, a request for a threading pattern.In the process of NIO, when a request comes in, open the thread

The implementation principle of JAVA NiO selector __java

Java NiO Core Class library Multiplexer selector is based on epoll multiplexing technology implementation Compared to select, poll system calls, Epoll has the following advantages: 1. The socket descriptor (FD) that supports one process opens is unrestricted and limited to the maximum number of file handles for the operating system.The biggest flaw in select is that there is a limit to the amount of FD opened by a single process, set by Fd_setsize, an

Progress of optoelectronic devices in automatic switched optical networks

optical receiving devices. The receiver with a rate of 10gbit/s has been applied, and the 100GBIT/S device has a laboratory sample. Optical amplifiers mainly include fiber amplifiers and semiconductor optical amplifiers (SOA), in which erbium-doped fiber amplifier (EDFA) has been widely used in practical projects, the current research hotspot is bandwidth over 80nm UWB EDFA and distributed Raman fiber amplifiers. Due to its small size, gain width and amplification, switch and other functions, S

Proactor and reactor in Aces

Proactor and reactor in Aces Ace_select_reactor is the default reactor implementation that is used by all platforms except Windows and will eventually wait with the Select () system function on those systems. Ace_wfmo_reactor on Windows is the default reactor implementation. The implementation does not use the Select () multiplexer, but instead uses the WaitForMultipleObjects (). When using Ace_wfmo_reactor, some tradeoffs are needed: Ace_wfmo_reac

The bio, NIO, Apr mode settings for Tomcat on Linux servers

notifies the reader to read and write, continue to read and write, continuously looping until read-write is completed.Java support for bio, NIO, AIO:Java BIO: Synchronization and blocking, the server implementation mode for a connection to a thread, that is, the client has a connection request when the server needs to start a thread to process, if the connection does not do anything will cause unnecessary thread overhead, of course, can be improved through the thread pool mechanism.Java NIO: Sy

How to start the Linux daemon

. Turn off standard input. The process is no longer able to receive any input, even if it is running in the foreground. REDIRECT standard output and standard error to file nohup.out . In other words, the nohup command actually separates the child process from the session it is in.Note that the nohup command does not automatically turn the process into a "background task", so you must add a symbol.Seven, screen command and Tmux commandAnother idea is to use the terminal

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