Archive | August 2013

ANALOG & DIGITAL TRANSMITION

ANALOG TRANSMITION

In analog transmition or signal, the transmition power varies (change) over a continuous range with respect to sound, light and radio waves.

EXAMPLE

Current, voice.

DIGITAL TRANSMITION

A digital signal may assume to be a discrete set of values within a given range.

  EXAMPLE

Computer, Networks.

                                                                           To

Digital ———->analog (Modulation)

                                                                          To

Analog ———>digital (Modulation)

MODEM

 Device which converts both Analog & Digital. Digital to Analog both signal are called Modem.

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DOUPLEX

FULL DOUPLEX

Also called to way communication, the source and the sink can enter change their roles.

HALF DOUPLEX

In which source and destination can’t be able to transmate and receive data simultaneously.

COMPONENTS OF DATA COMMUNICATION

1)                        Transmeter (source)

2)                        Channel (medium/line)

3)                        Receiver (sink)

                  Transmeter                Receive

                  ————>  [Channel] ———->

                    (source)                       (sink)

 

BASIC TERMINOLOGY

1)            Data.

2)            Networking.

3)            Signal.

4)            Transmition.

5)            Protocol.

6)            Data Sequencing.

7)            Data Routing.

8)            Error Control.

9)            Flow Control.

DATA

Collection of fax and figure is called data.

NETWORKING

Networking = Resource sharing.

SIGNAL

Signal carry message or data.

TRANSMITION

Communication of data achive by the processing of signal.

PROTOCOL

Common set of rules and signals that are used by computer for communication over the networking. Example: Ethernet.

DATA SEQUENCING

A long message to be transmated is broken in to smaller packet of fixed size.

DATA ROUTING

The process of finding the most efficient root between source and destination before sending a data.

FLOW CONTROL

Regulates the process of sending data b/w fast sender & vice versa.

ERROR CONTROL

It ensure that data are transmated without any error. 

BASIC ELEMENTS OF COMMUNICATION SYSTEM

1)            Sender.

2)            Communication Medium.

3)            Receiver.

information

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                                               PC1                                         PC2