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About Node.js
As an asynchronous event driven JavaScript runtime, Node is designed to build scalable network applications. In the following “hello world” example, many connections can be handled concurrently. Upon each connection the callback is fired, but if there is no work to be done Node is sleeping.
This is in contrast to today's more common concurrency model where OS threads are employed. Thread-based networking is relatively inefficient and very difficult to use. Furthermore, users of Node are free from worries of dead-locking the process, since there are no locks. Almost no function in Node directly performs I/O, so the process never blocks. Because nothing blocks, scalable systems are very reasonable to develop in Node.
# HelloWorld.js
const http = require('http');
const hostname = '127.0.0.1';
const port = 3000;
const server = http.createServer((req, res) => {
res.statusCode = 200;
res.setHeader('Content-Type', 'text/plain');
res.end('Hello World\n');
});
server.listen(port, hostname, () => {
console.log(`Server running at http://${hostname}:${port}/`);
});
PROPOSED STANDARD
Errata Exist
Network Working Group A. Vainshtein, Ed.
Request for Comments: 4553 Axerra Networks
Category: Standards Track YJ. Stein, Ed.
RAD Data Communications
June 2006
Structure-Agnostic Time Division Multiplexing (TDM)
over Packet (SAToP)
Abstract
This document describes a pseudowire encapsulation for Time Division
Multiplexing (TDM) bit-streams (T1, E1, T3, E3) that disregards any
structure that may be imposed on these streams, in particular the
structure imposed by the standard TDM framing.
INFORMATIONAL
Network Working Group A. Vainshtein, Ed.
Request for Comments: 5086 I. Sasson
Category: Informational Axerra Networks
E. Metz
KPN
T. Frost
Zarlink Semiconductor
P. Pate
Overture Networks
December 2007
Structure-Aware Time Division Multiplexed (TDM) Circuit Emulation
Service over Packet Switched Network (CESoPSN)
Abstract
This document describes a method for encapsulating structured (NxDS0)
Time Division Multiplexed (TDM) signals as pseudowires over packet-
switching networks (PSNs). In this regard, it complements similar
work for structure-agnostic emulation of TDM bit-streams (see RFC
4553).
- RS422/RS232 combinatie - E1 - 4-wire E+M
