PSTN Full Form and Meaning

The question asks for the full form of the acronym PSTN. Let's break down what PSTN stands for and why the correct option is the right choice.

Understanding PSTN

PSTN is a globally interconnected network of public telephone networks that was the primary means of communication before the rise of mobile and internet-based services. It uses circuit switching technology to establish dedicated connections for voice calls.

Analyzing the Acronym PSTN

The acronym PSTN stands for:

• Public: This signifies that the network is operated by government or private organizations for public use.
• Switched: This refers to the use of switching centers that connect different telephone lines to establish a communication path.
• Telephone: This indicates the primary purpose of the network – voice communication via telephones.
• Network: This refers to the interconnected system of infrastructure, lines, and equipment used for communication.

Evaluating the Options

Let's look at why the other options are incorrect:

• Public Service for Technical Networks: While PSTN is a public service, this option does not accurately reflect its primary function related to telephones.
• Public Satellite Television Network: PSTN is related to telephony, not satellite television broadcasting.
• Public Safety Trademark Network: This option is completely unrelated to the purpose and meaning of PSTN.

Therefore, the only accurate expansion of the PSTN acronym is Public Switched Telephone Network.