VSAT - Facilitating Communication in Remote Places

VSAT (Very Small Aperture Terminal) is a technology that is used for effective communication in remote areas using Satellites and components located on ground. This article lucidly covers the details on the uses of VSAT and how the signals are transmitted.

Aspirants would find this article very helpful while preparing for the IAS Exam.

VSAT – 2 Main Components

A VSAT has 2 main components, which are given below

  1. A transceiver placed outdoors in direct line of sight to the satellite, and 
  2. Interfacing of the transceiver and the users communication device will be done through a device placed indoors.

VSAT – How the Signals are Sent and Received

  1. A satellite transponder will receive or send signals to the transceiver located on earth.
  2. There will be a hub station located on earth which will send or receive signals from satellites.
  3. Satellite will help in connecting all the users via the hub station.
  4. Hence for any communication to work, the signal will go from one user to the hub, which will be transmitted to the satellite, which will in turn be transmitted to the intended user.

VSAT – Functions and its Uses

  1. VSAT is a technology that represents another option for Internet connectivity in extremely remote areas and distant field locations because there are very limited choices for telecommunications and Internet connectivity. 
  2. It is used for communication at seas, and in distant locations such as on oil rigs and utility services.  
  3. VSAT terminals are used by Armed forces located in remote mountainous regions or by the Navy while operating in seas.
  4. Can be used for disaster relief operations, as well as industrial applications, or even for communication while carrying out scientific studies in remote locations like Antarctica or in Oceans.

VSAT – Transmission of Data

VSAT is used to transmit narrow band or broadband data.Examples of narrow band data transmitted through VSAT are listed below.

  1. point-of-sale transactions using credit cards, 
  2. Polling or Radio Frequency Identification (RFID) data, or 
  3. SCADA

Examples of broadband data transmitted through VSAT are listed below.

  1. Provision of satellite Internet access to remote locations, 
  2. Voice over Internet Protocol (VoIP) 
  3. Video 


The above details would help candidates prepare for UPSC 2020.

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