Computer Networking

Transport Layer

Types of Data Transmission

In digital devices, there are two methods to transmit data

1. Serial transmission: It sends one data-bit at a time over a single channel.

2. Parallel transmission: It can sends multiple data-bits at a time over multiple channels.

In serial data transfer, there are two basic types of data transmissions

1. Synchronous Data Transmissions

2. Asynchronous Data Transmissions

1.  Asynchronous Transmission

Asynchronous Transmission

  • In asynchronous transmission mode, the data transmitted character by character.
  • Irregular gaps between the characters
  • It is Less efficient and slower than the synchronous transmission.
  • It uses start (0) and stop (1) bits. Stop bit (1) is transmitted at the end of each character which tells that character is transmitted.
  • Asynchronous transmission also known as half-duplex.

2. Synchronous Transmission

Synchronous Data Transmission

  • In synchronous transmission mode, the data transmitted block by block.
  • Each block consists of many characters.
  • It uses the clock to control the timing of bits.
  • It is faster than asynchronous because No gap between the characters.
  • For example, computer to printer communication.
  • Synchronous transmission mode also known as Full-duplex.



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