Computer Science Studies, Data Communications – Short Questions, this is the Part 2.

Explain why Unicode is superior to ASCII code

ASCII code uses 8 bit. It is limited to 256 different characters. Unicode uses 16 bits. It allows over 65,000 codes. It can represent all major languages.

Define transmission modes.

The way in which data is transmitted from one place to another is called data transmission modes. Simplex, half duplex and full duplex are modes of data transmission.

Describe half duplex mode of data transmission.

In simplex mode, data can flow only in one direction. It operates in manner similar to a one- way street. The direction of never changes. A device with simplex mode can either send or receive data. Traditional television broadcast in an example of simple’s mode.

Describe half duplex mode of data transmission.

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In half-duplex mode, data can flow in both directions but nor at the same time. It is transmitted one-way at one time. A device with half-duplex mode can send or receive data but not at the same time. So, the speed of half-duplex mode is slow. Internet surfing us an example of half duplex transmission.

Compare simplex and half duplex mode.

In simplex mode, data can flow only in one direction. Radio and television broadcasting are the examples of this mode. In half-duplex mode, data can flow in both directions but not at the same time.

What is full duplex data transmission mode?

In full-duplex mode, data can travel in both directions simultaneously. Full duplex mode is faster way of data transmission than half duplex. Time is not wasted in changing in the direction of data flow. Telephone conversation is an example of full duplex mode.

what do you know about parallel data transmission?

A method of transmission in which groups of bits are sent at the same time over multiple wires is called parallel transmission. It is usually unidirectional. Each bit is transmitted over a separate line. Data transmission between computer and printer is an example of parallel transmission.

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what is serial data transmission?

A method of transmission in which data is sent one bit at a time is called serial transmission. Telephone lines se this method of data transmission. Each individual bit of information travels along its own communication path.

Differentiate between serial and parallel transmission.

Parallel transmission in faster because all bits are sent at the same time. Setial transmission is slower that parallel transmission because data is sent sequentially one bit at a time. Each individual bit of information travels along its own communication path.

Describe Asynchronous data transmission.

In synchronous mode, saved data is transmitted block by block. Each block nay consists of many characters. It uses a clock to control the timing of bits being sent. Synchronous transmission in much faster than asynchronous because there is no gap between characters.

How does asynchronous transmission take place?

In asynchronous transmission, data is transmitted character by character. It uses a special start signal. A start bit has a value of 0. The value of 0 indicates that a character is about to be transferred. It alerts the receiver and it gets ready to receive the character. It start but has a value1, it indicates that the line is idle.

Compare asynchronous and synchronous transmission.

In asynchronous transmission, data is transmitted one character at a time. The sender and receiver are not synchronized with each other. Synchronous transmission sends a block of characters at a time. It allows sender and receiver to be synchronized with each other synchronous transmission is typically more efficient than asynchronous communications.

Differentiate between bounded $ unbounded communication.

In bounded media, communication device are directly connected via physical media like wire coaxial cable and fiber optics are examples of bounded media. In unbounded signal etc. microwave and satellite are examples of unbounded media.

Name some bounded media.

Some examples of bounded media are wire pairs, coaxial cable and fiber optics.

Name some unbounded communication media.

Some examples of unbounded communication media are microwave system and communication satellite.

What is wire pair?

Wire pair is a communication media made up of copper. Wire pair is usually made up of copper. The pair of wires is twisted it is used for short distance digital data communication. Its speed is 9600 bits per second in a distance of 100 meter.

What is coaxial cable.

Coaxial cable consists of a copper wire core covered by insulating material. The insulated copper wire is covered by copper mesh. It protects the cable from electromagnetic waves. It is used for long-distance telephone lines and local area networks.

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