Data communication
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Data Communication index
Data
Communications is the movements of encoded information from one to
another point by means of
Electro-optical transmission systems,
which are often refer to data communication networks ( F.Jerry &S.E.Tom,
1978 ). In data communications systems, information are generally call
data or a message ( H.Trevor, 1979 ).
By establishing networks,
data communication, which facilitate more efficient use of central
computers, collect
data from remote points ( terminals ) and transmit it to a central
point equipped with a computer or another
terminal, or to perform the reverse process, or some combination of
the two ( H.Trevor,1979 ).
In most cases, a data communications
network usually involves computers with one or more terminals
connected by communications lines, which
carry the messages between the computer and its associated terminals,
or between terminals. In this communications and networks definition,
terminals can be define as any one of a
number devices such as teleprinters and
other keyboard devices, line printers, punch-card readers, visual display
terminals, and even computers. Although, the communications lines may
come from special-purpose data networks,
generally they are telephone lines.
Protocols used on networks
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Protocols are established ways of transferring information. For example, when two people wish to communicate each others, they use established protocols. This will make sure that both of them know how the information they present will be received. In a similar way protocols enable computers to share information. If the two computers do not have common protocols they cannot communicate. All network services are described by protocols. Protocols give the formulas for passing messages, specify the details of message formats, and describe how to handle error conditions. The network uses TCP/IP protocols and has additional standards for the interchange of news, mail and a variety of other services. Application packages on the Internet allow email, ftp and remote login. These applications have their own protocols built on the basic TCP/IP protocols that define the Internet.
IP protocol is the protocol that defines the basic unit of data transfer and the exact format of all data as it passes across the Internet. IP includes a set of rules that specify how packets should be processed and how errors should be handled. IP is the "native protocol" of Unix machines.
TCP
protocol is specifies the format of the data and acknowledgements
that two computers exchange to achieve a reliable transfer, as well as
procedures the computers use to ensure that the data arrives correctly.
TCP can be used with a
variety of packet delivery systems and
is not just restricted to working with the Internet IP protocols.
Conclusion
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In conclusion, communication
are one of our most important activities in our life. We almost use it
in our everyday lifestyle. As communicating are part of our lifestyle,
scientist time by time keep inventing new technologies for us to communicate
with each other easier around the world. And Protocol
is one of the technologies used in communications around the world. They
used ip protocol for communicating or tranfering data across the internet,
and tcp protocol for tranfering data between two computers or more. Without
this, we can not communicate through computer to another computer around
the world.
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