Daisy chain (information technology)

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Daisy chain (information technology)

Daisy chain is a term used in information technology.

term is also used in computer software

Computer software

Computer software, or just software is a general term used to describe a collection of computer programs, Algorithm and Software documentation that perform some tasks on a computer system....
. Daisy chain installation

Installation (computer programs)

Installation of a computer program is the act and the effect of putting the program in a computer system so that it can be execution .Most programs are supplied in a condensed form intended for sale and distribution....
is a "smart" installation, whereby an installation can happen piecemeal, as all the components of the package

Software package (installation)

A software package refers to computer software packaged in an archive format to be installed by a package management system or a self-sufficient Installation ....
are connected to each other. If there is a disconnect during a web

World Wide Web

The World Wide Web is a very large set of interlinked hypertext documents accessed via the Internet. With a Web browser, one can view Web pages that may contain writing, s, videos, and other multimedia and navigate between them using hyperlinks....
-based installation the software need not be downloaded from scratch, but rather restarted from where it stopped.

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Encyclopedia

Daisy chain is a term used in information technology.

Computer software

The term is also used in computer software

Computer software

Installation (computer programs)

Software package (installation)

World Wide Web

Google Pack

Google Pack is a software package that allows users to discover, install, and maintain a number of application programs. It was announced at the 2006 Consumer Electronics Show, on January 6....
.

Computer hardware

The term is also used when connecting multiple hardware using the same communication protocol to a shared communication bus. For example when you connect multiple hardware having UART ports which communicate via RS-232

RS-232

In telecommunications, RS-232 is a standard for serial communications binary data signals connecting between a DTE and a DCE . It is commonly used in computer serial ports....
protocol to the same physical bus, you are making a daisy chain. This means that you wire all RX signals together and all TX signals together and so on. Then a predefined logic would allow only one of them to seize the bus in a given time. This way you say that your devices are daisy chained. Some other situations or protocols which use daisy chains are SCSI

SCSI

Small Computer System Interface, or SCSI , is a set of standards for physically connecting and transferring data between computers and peripheral devices....
and Firewire

FireWire

The IEEE 1394 interface is a serial communications interface standard for high-speed communications and isochronous real-time data transfer, frequently used by personal computers, as well as in digital audio, digital video, automotive, and aeronautics applications....
devices.

Network topology

See Network topology#Daisy chains

Network topology

Network topology is the study of the arrangement or mapping of the elements of a Computer networking, especially the physical and logical interconnections between nodes....
. SCSI does not implement daisy chain

System access

The term is also used in the context of the Session-

Session layer

The Session Layer is Layer 5 of the seven-layer OSI model of networking.The Session Layer provides the mechanism for opening, closing and managing a Session between end-user application processes, i.e....
, Application-

Application layer

Application Layer is a term used in categorizing protocols and methods in architectural models of computer networking. Both, the OSI model and the Internet Protocol Suite contain an application layer....
or Presentation Layer

Presentation layer

The Presentation Layer is the sixth layer of the seven-layer OSI model of computer networking.The Presentation Layer is responsible for the delivery and formatting of information to the application layer for further processing or display....
when a computer system is not being accessed directly but rather by deliberately hopping via other systems first. In the easiest example, a telnet

TELNET

Telnet is a network protocol used on the Internet or Local Area Network connections. It was developed in 1969 beginning with RFC 15 and standardized as Internet Engineering Task Force STD 8, one of the first Internet standards....
or SSH

Secure Shell

Secure Shell or SSH is a network protocol that allows data to be exchanged using a secure channel between two networked devices. Used primarily on Linux and Unix based systems to access shell accounts, SSH was designed as a replacement for TELNET and other Computer security remote Shell s, which send information, notably passwords, in...
connection is established from the first machine to the shell

Shell (computing)

In computing, a shell is a piece of software that provides an Interface for users. Typically, the term refers to an operating system shell which provides access to the services of a kernel ....
on a second machine, and then from the second machine to the shell on a third machine. Another typical example is the "terminal session inside a terminal session" using RDP

Remote Desktop Protocol

Remote Desktop Protocol is a multi-channel protocol that allows a user to connect to a networked computer. Clients exist for most versions of Windows , Linux/Unix, Mac OS X and other modern operating systems....
. There are many reasons to create such types of daisy chains, such as to connect to a system on a non-routed network via one or more gateway systems, keeping sessions alive on a main computer while not being connected to this main computer at all times, to save bandwidth or when on an unstable network by first connecting to a better connected machine, or even in an attempt to cover one's tracks while engaged in cybercrime

CyberCrime

CyberCrime was an innovative, weekly United States television program on TechTV that focused on the dangers facing computer users. Filmed in San Francisco, California, the show was hosted by Alex Wellen and Jennifer London....
.