Data Transmission

Data Transmission

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Transmission of Data:

  • The transfer of data in the form of bits from one device to another can be described.
  • Some type of medium, for example, fiber optics, etc. is necessary to transmit data.
  • The data can be transmitted from the machine to the printer over a short distance or long distances, for example calling abroad by telephone.
  • For data transmission three key considerations must be considered:

 

  1. The path for data transfer (one or two way).
  2. Form of transmitting i.e. not one-time bits to pass.
  3. Form of syncing.

 

Types of Data Transmission:

There are two types of data transmission:

  1. Serial
  2. Parallel

 

Serial Data Transmission:

  • In serial communication systems, there is a single wire over which data bits are transferred one by one.
  • It is known as serial transmission because bits need to be organized before they are sent over the channel.
  • This way the receiver can receive and arrange data in order and consider it to be errorless.

Serial Data Transmission

  • This data processing is often used where long-distance connectivity is required.
  • In serial communication systems, data transfer speed is slower than in parallel communication systems.
  • There is no problem with synchronization when transmitting serial data.

 

Example:

An example of serial data transmission is the transfer of bits from the computer to the modem for transmission over the phone.

 

Parallel Data Transmission:

  • Multiple wires in the concurrent transmission networks are transmitted continuously via these parallel wires.
  • This data transmission method is the best practical application over shorter distances.
  • The bit can be skewed when a long-distance synchronization issue is used.
  • Used for internal communications usually in computer networks.
  • It is faster than serial data transmission.
Also Checkout:  Networks and Communications

Parallel Data Transmission

Example:

An example of parallel data transmission is a ribbon wire that is used to transfer data from the computer to the printer.

Modes of Data Transmission:

There are three modes of data transmission:

  1. Simplex
  2. Duplex
  3. Half-Duplex

 

Simplex Data Transmission:

In this mode, data is transmitted in one direction only i.e. sender to receiver.

Example:

Transfer of data from computer to printer.

Simplex Data Transmission

Duplex Data Transmission:

In this mode, data is transmitted in both directions simultaneously.

Example:

Broadband phone connection.

Duplex Data Transmission

Half-Duplex Data Transmission:

In this mode, data is transmitted in both directions but not simultaneously i.e. not at the same time.

Example:

A phone conversation.

Half-Duplex Data Transmission

 

Error Detection & Correction in Data Transmission:

  • The techniques used for data processing are known as error detection while the transmission of data, sound, and other impairments happen.
  • Error identification allows efficient channel data distribution.
  • It, therefore, decreases the risk of undetected error, i.e. the shift of inappropriate frames.
  • An algorithm of some kind is added to the error detecting code normally transmitted on the channel by the data before transmission of the data.
  • The receiver uses the same algorithm, produces the submitted data’s error code, and then compares it to the end-of-sending Error Code.
  • If all codes are similar then the obtained data is error-free.
  • The submitted information shall otherwise be deemed inaccurate and the applicant shall then take action.

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