scada protocols

user; A call is initiated by a SIP user and terminated by a PSTN user. A call is initiated by a PSTN user and terminated by a SIP user. SIP-T provides two methods for intercommunication between SIP and ISUP, namely encapsulation and ing, which are defined by RFC3204 and RFC3398 respectively. However, the SIP-T only focuses on the intercommunication of basic calls, while the supplementary business is basically not involved. 2. ITU-T protocols for SIP-

"not" widely used, and HTTP 1.0 being widely used.In addition, it is said that the IETF will release the HTTP 2.0 standard next year. I'll wait and see.2. The relationship between HTTP and TCPSimply put, the TCP protocol is the cornerstone of the HTTP protocol--http protocol needs to rely on the TCP protocol to transfer data.In the network layering model, TCP is called the Transport Layer protocol, and HTTP is called the application-layer protocol.There are many common application-layer

structObjc_method_list *class_methods objc2_unavailable;//class method List structObjc_protocol_list *protocols objc2_unavailable;//list of protocols implemented by classification} This structure mainly contains the instance and class methods of the classification definition, where the Instance_methods list is a subset of the method list in Objc_class, and the Class_methods list is a subset of the me

Recently made a terminal 5.0 platform, which uses a number of serialized protocols, such as XML,JSON,PROTOBUF, some places to use the feeling pretty good, some places use some inappropriate, and found that many open source is widely used in the serialization protocol, this is a basic prerequisite skills, so I would like to summarize, for the future architecture set The choice to do bedding;What is a serialization protocol? the serialization protocol i

Open Source License AgreementLicense is a license to the software that gives you the right to get the code, what you can do with other people's work, and what kind of actions are prohibited.Types of Open Source agreementsThere are many open source agreements that exist today, and there are currently more than 60 kinds of http://www.opensource.org/licenses/alphabetical approved by open source Initiative organization. Our common open source agreements such as BSD, GPL, lgpl,mit, etc. are all OSI-a

-------------------- Delegation mode-categories, protocols, and blocks Delegate. What is a delegate? XXX is a common form of entrusting people to do things. From here we can know that the entrusting is done by both parties. The delegation in OC is often used together with the protocol. The definition of delegation is the design pattern that one class specifies another class to process certain tasks. These days I have learned about classes,

Author: gnuhpcSource: http://www.cnblogs.com/gnuhpc/ From: http://www.sinoprise.com/read.php? Tid-662-page-e-fpage-1.html (unfortunately this link has not been opened), I basically did not change, just some typographical and finishing.References: http://www.fsf.org/licensing/licenses/There are many open-source protocols today, and there are currently 58 open-source protocols approved by the Open Source Init

. RTCP itself does not provide data encryption or identity authentication. Srtcp can be used for such purposes.SRTP srtcp references Rfc3711 Secure real-time transmission protocol (secure real-time transport protocol or SRTP) is a protocol defined based on the real-time transport protocol or RTP, the aim is to provide encryption, message authentication, integrity assurance and replay protection for data in real-time transmission protocols in unicast

Starting from this article, we will introduce some Bluetooth profiles and protocol as an entry-level reader. For details, refer: Bluetooth SIG Bluetooth Wiki The instructions on how to use Bluetooth devices are handed over to the above-mentioned websites. This site is committed to clarifying the technical specifications of protocols and profiles. First, the architecture of the Bluetooth protocol layer is described in this document. Host and Control

Common mail service protocols: POP3, IMAP, EXCHANGE, and imapexchange Some time ago I did mailbox client development, involving protocol support issues. By the way, I learned several major protocols: Generally, before setting up a mailbox on a mobile client, you 'd better know which protocol is supported by your mailbox. The common protocols include the following

This section briefly introduces the internal structure of TCP/IP and lays the foundation for discussing Internet-related security issues. TCP/IP protocol groups are popular in part because they can be used on a variety of channels and underlying protocols (such as T1 and X.25, Ethernet, and RS-232 serial interfaces. Specifically, TCP/IP is a set of protocols, including TCP and IP, UDP (User datainprotocol),

Comparison of five open source protocols (Bsd,apache,gpl,lgpl,mit). When a series of giants such as Adobe, Microsoft and Sun begin to show their preference for "open source", the era of "open source" is coming! There are many open source protocols available today, and there are currently 58 (http://www.opensource.org/licenses/alphabetical) of open source agreements approved by the Open Source Initiative o

that some commands are sequential, but most commands do not have this requirement. 3,RTSP can be said that the basic reuse of the design idea of HTTP, from the request and response message composition can be clearly seen. But it also borrowed from the relevant good ideas in FTP. such as the separation of data and control, RTSP data transmission is by RTP/RTCP and other protocols to achieve. In HTTP, the request response pattern is based on the CS mod

First, Web applications　　A Web application is an application that can be accessed through the web;The biggest benefit of the program is that the user has easy access to the application, and the user needs only a browser and no additional software to install.There are two modes of application: C/S,/b.1, c/S is a client/server-side program, which means that such programs generally run independently.2, b/S is browser-side/server-side applications, such applications generally with the help of Google

The HTTP protocol defines eight methods or "actions" to indicate different ways to manipulate the resources specified by the Request-uri.The details are as follows:OPTIONS: Returns the HTTP request method that the server supports for a specific resource. You can also test the functionality of your server with a request to send a ' * ' to the Web server.HEAD: Ask the server for a response that is consistent with the GET request, except that the response body will not be returned. This method allo

Send () methodProperty: ReadyState: A state indicating whether the request was successfulServer snooping and requestsConstruction and testing of the environment1: Download XAMPP Integration Server database and PHP Server Software//self-Baidu download2:dreamwear establish a site and establish a local server selection Php/mysql PHP files need to be placed under the htpdos/folder in the XAMPP installati

Ipx/spx Two network protocols are proposed by NetWare company primarily for LAN and network games where the IPX protocol has the full name of the routing function Internetwork Packet Exchange (Internetwork Packet Exchange), the IPX protocol is the most low-level network protocol with Novell NetWare, which is mainly used to control the addressing and routing of packets between LAN or LAN, only responsible for the transmission of packets in the LAN, do

Simple Network Management Protocol (Snmp:simple Network Management Protocol). The Simple Network Management Protocol is the SNMP protocol that we often refer to as a set of network management protocols defined by the Internet Engineering Task Force (ietf:internet Engineering task Force). The protocol is based on the Simple Gateway Monitoring Protocol (Sgmp:simple Gateway Monitor Protocol). With SNMP, a management workstation can remotely manage all ne

HTTP is only responsible for transmitting the data in the past, not the data is XML, HTML, pictures, text files or anything else. and the SOAP protocol defines how to make an object into XML text, how to call it in a remote way, and how to confuse it.Two kinds of protocols are said:HTTP is the Post Office Protocol, they specify how you want your envelopes to be written, how many stamps to paste, etc...Soap is the agreement between you and the person w

When using X and S locks to lock data objects, some rules need to be agreed, such as when to apply for an X lock or S lock, hold the lock time, and when to release. Called these rules for the blockade agreement (locking Protocol). The different rules governing the blockade form a variety of blockade agreements. Different blocking protocols provide certain guarantee for the correct dispatch of concurrent operation to different extent. 一、一级 Blockade Pr