communication

问题 I have a link between a host and a switch. The link has a bandwidth & a latency. How to calculate the time of 2 packets(with size 1KB) to be transferred from Host A to Switch 1 ? Here's the diagram(I am talking about the first link) Note: I just want to calculate it manually for these values, I want to know the principles/laws of calculating these problems. 回答1: Propagation time = (Frame Serialization Time) + (Link Media Delay) + (Queueing Delay) + (Node Processing Delay - if known) Formulas:

问题 I have two C# programs and I want to send some data back and forth between them. (And check if the data arrived to the other application.) The two programs will always run on the same computer, so no networking capability is required. I've already read some questions with similar topics here, but I'm not entirely sure which is the right method for me. (WCF, Remoting, etc.) What I want to know, is which one is the easier to implement for a beginner in C#? (I don't want it to get too

问题 I am a blackberry developer and do want to code to transmit and receive information between two devices using bluetooth . https://github.com/blackberry/JDE-Samples/tree/master/com/rim/samples/device/bluetooth/bluetoothdemo I referred this program of bluetooth demo which Takes info of bluetooth serial ports available in AppScreen and finds if they are supported or not The SPPScreen java file takes info of bluetooth serial port and connects to serial port whose device id is " Hi there " This

问题 I'm developing an interactive system where two client flash apps will talk to a third server app. The clients will be sending some status information to the server. I think I need two way communication...haven't decided whether the server needs to send back any acknowledgements yet. These will be applications and not .swfs that run in a browser. So far the only method that I see are to make the server an AIR app (b/c AIR has a Server Socket class) and make the clients Flash projectors (b/c

问题 I'm getting following error on emulator.I'm posting codes which is for communicating with paired Bluetooth device.I'm able to connect the Bluetooth device which is non Android,but when I add code for communication (read/write) it gives an error on emulator.Please suggest if anybody knows the solution.I'm new in Android. "Unfortunately, App has stopped " MainActivity.java public class MainActivity extends Activity { Button scanButton,connectButton,sendButton; EditText commands; TextView out;

问题 Is there a way to make a conference call programmatically on the IPhone ? I want to be able to place a call to persons A and B, connecting both, and then dropping myself and let the two parties continue the conversation. Is that possible ? 回答1: Not possible. An app can place a call to a single phone number, via the -openURL: method on UIApplication , but once it does that, it goes into the background and the Phone app takes over. Also, it sounds as if you’re trying to make a prank-calling app

问题 I have a client and a server application that is communicating just fine, there is a TIdCmdTCPServer in the server and a TIdTCPClient in the client. The client has to authenticate in the server, the client asks the server for the newest version information and downloads any updates, and other communications. All this communication with TIdTCPClient.SendCmd() and TIdTCPClient.LastCmdResult.Text.Text. The way it is, the server receives commands and replies, the clients only receives replies,

问题 I have a console application I wrote in C# that polls multiple devices, collects some data, and stores the information on a database. The application runs on our web server, and I was wondering how to invoke a method call from the command console (so I can exec a command from php that will be read by the console application, a shell command would work as well). Anyone got any ideas? I've been floating around 'the google' and have found nothing that will supply my current needs. Also, i'm not

问题 Using Autofac DI container- What is the difference between registering a unit of work in my web application as per request to registering it as PerLifetimeScope? Autofac creates a new scope for each request and by registering the unit of work as PerMatchingScope it will anyways be resolved from the scope created for the request. If I'm mistaken, please correct me, otherwise, what is the difference? Moreover, If I register the UoW as PerLifetimeScope, and have a console application that sends

问题 I have question about BCH Encoding. Is BCH Encoding is the same operation like CRC remainder calculation? M(x) mod G(x) = R(x) and R(x) is my BCH code? 回答1: You are pretty much correct. To be precise, if your generator polynomial is g(x) and your block size is n , then the valid code words are the multiples of g(x) with degree < n . Lets say you have a message m(x) of degree < k , and g(x) has degree n-k : There are different ways you could turn your message into a unique valid code word. m(x