Define data communication.
Data communications is a process of transferring data electronically from one place to another. Data can be transferred by using different medium.
List out different elements of data communication.
The basic elements of data communication are message, sender, receiver, medium and Encoder and Decoder.
Define the term ender in data communication?
Sender is device that sends message. It is also celled source or transmitter. Normally, is used as sender in data communication systems.
Define the term receiver in data communication?
Receiver is a device that sends the data message. It is also called sink. The receiver can be computer, printer, or another computer related device.
Differentiate between sender and receiver.
Sender is a device that sends the data massage. It is also called source. Sender is normally a computer. Receiver is a device that receives message. It can be computer, printer, or another computer related device. The receiver must be capable of accepting the message.
Define the term medium in data communication?
Medium us the physical path that connects sender and receiver. It is used to transmit data. The medium can be a copper wire, a fiber optic cable, microwave etc.
Define the term Encoder and Decoder.
Encoder is a device that converts digital signals in a form that can pass through a transmission medium. Encoder is a device that converts the encoded signals into digital form sender and receiver cannot communicate successfully without encoder and decoder.
What is signal?
Signal is an electromagnetic or light wave that represents data signals are used to transfer data from one device to another through a communication medium.
Define digital signal.
Digital signal is sequence of voltage represented in binary form. Digital signal are in the form of electrical pulses of ON and OFF. There signal are in discrete form. Digital signals are faster and efficient. All data communication between computers is in digital form.
Define analog signal.
Analog signal is a continuous electrical signal in the dorm of wave. The wave is known as carried wave. Sound wave is an example of analog signal.
Write is two characteristics of analog signal.
Two characteristics of an analog wave are frequency and amplitude. The number of times a wave repeats during a specific time interval is known as frequency. The height of wave within a given period of time is known as amplitude.
Differentiate between analog and signal. Which is popular?
Analog signal is continuous electrical signal is the form of wave. Sound wave is an example of analog signal. Digital signal is sequence of voltage represented in binary form digital signals is popular. The provide lower error rates, higher transmission speed and higher quality voice transmission.
How is data represented in computer?
Computer works with binary numbers. Binary number may be 0 or 1. The data inside the computer is represented as electrical pulses. The binary digit 1 indicates the presence of electrical pulse.
Define bit and byte.
A binary digit is called bit. It takes one storage location in memory. A collection of eight nits in called byte. It is used to store single character.
Write different encoding characters used to represent data in computer.
The process of converting data into binary form is known as encoding. Data can be converted into binary form by using different encoding techniques. These are BCD Code, EBCDIC Code, ASCII and. Unicode.
what is ASCII code?
ASCII is the most widely used coding scheme for personal computer. The 7-bit code displayed on computer screens. An 8-bit code can represent 256 characters. The extended 128 unique codes represent graphic symbols.
Why does ASCII code only provide 256 character combinations?
It is an 8-bit code, and 28=256.
What is Unicode?
Unicode is a 16-bit code. It can represent 65636 characters. It has started to replace ASCII code. It can represent the characters of all languages in the world.
Category: Computer & IT