♥Communication And Network♥

Modulation

In electronics, modulation is the process of varying one or more properties of a high-frequency periodic waveform, called the carrier signal, with a modulating signal which typically contains information to be transmitted . On the other hand, the purpose of modulation is usually to enable the carrier signal to transport the information in the modulation signal to some destination . Besides that , in telecommunications , modulation is the process of conveying a message signal , for instance a digital bit stream or an analog audio signal  inside another signal that can be physically transmitted . Modulation of a sine waveform is used to transform a baseband message signal into a passband signal , for instance low-frequency audio signal into a radio-frequency signal (RF signal).

 

Demodulation

The use of demodulation data or "enveloping" is an excellent complement to narrow band spectral analysis in detecting faults in rolling element bearing and gearboxes . This article describles what demodulation is from a qualitative viewpoint , and how it is used in practice . It also purposely avoids using highly technical terms so that it can be understood by those without a technical background . 

 

Bandwidth

Bandwidth is the John A Hartford Foundation's one-stop , online source for communications tools and information . The site is designed to help grantees and other professionals enhance , strengthen and ass visual impact to a variety of publications , presentations and communications about aging and health .

TCP/IP

The Internet Protocol  Suite is the set of communications protocols used for the Internet and other similar networks . It is commonly also known as TCP/IP named from two of the most important protocols in it : the Transmission Control Protocol (TCP) and the Internet Protocol (IP) , which were the first two networking protocols defined in this standard . The Internet Protocol Suite consists of four abstraction layers . From the lowest to the highest layer , these are the Link Layer , the Internet Layer , the Transport Layer , and the Application Layer . The layers define the operational scope or reach of the protocols in each layer , reflected loosely in the layer names . Each layer has functionality that solves a set of problems relevant in its scope . 

 

Node 

In communication networks , a node is a connection point , either a redistribution point or a communication endpoint as some terminal equipment . The definition of a node depends on the network and protocol layer referred to . A physical network node is an  active electronic device that is attached to a network and is capable of sending , receiving or forwarding information over a communications channel . A passive distribution point as a distribution frame or patch panel is  is consequently not a node .  

 

Client

A client is an application or system that accesses a remote service on another computer system , known as a server , by way of a network . The term was first applied to devices that were not capable of running their own stand-alone programs , but could interact with remote computers via a network . These dumb terminals were clients of the time-sharing mainframe computer .  

Server

In computer networking , a server is a program that operates as a socket listener . The term server is also often generalized to describe a host that is deployed to execute one or more such programs . A server computer is a computer or series of computer , that link computers or electronic devices together . They often provide essential services across a network , either to private users inside a large organization or to public users via the internet .

 

Networking Operating Systems 

Networking operating system typically are used to run computers that act as servers . They provide the capabilities required for network operation . Network operating systems are also designed for client computers and provide functions so the distinction between network operating systems and stand alone operating systems is not always obvious . 

Networking Administrator

A networking Administrator is a person responsible for the maintenance of computer hardware and software that comprises a computer network . This normally includes deploying , configuring , maintaining and monitoring active network equipment .