The letters PSTN stand for public switched telephone network. It is a global telephony system comprised of the public telephone
networks. PSTN is a circuit-switched system. When it is used to make a call,
a communication channel is established between two points. Copper wires
carry analog data (the voices) over the channel for real-time conversations.
The switched network is associated with the Internet in that PSTN can
provide Internet service providers with infrastructure support. Telephone
service that utilises traditional telephone
and is supported by the public switched telephone network may
also be called plain old telephone service (POTS). IP telephone systems use the Internet
as the communication medium, while PSTN uses direct line connections.

Difference Between PSTN and VoIP Telephony

Voice over Internet Protocol (VoIP) is an alternative to traditional
PSTN service. The main difference between VoIP and PSTN is
that Internet telephony networks employ digital technologies. VoIP is based
on packet switching, while PSTN systems utilise circuit switching. With
VoIP, the voice reaches a destination point through the transmission of
individual network packets over the Internet.

PSTN Circuit-switching Technology

When PSTN circuit-switching technology is utilised
in communications, a circuit will be dedicated to the entire transmission
(phone call). Circuit-switching systems are beneficial for real-time voice
transmissions, such as during the phone communications. The PSTN connects
sections of wiring to offer a direct line for every voice call. Newer
digitally based telephone networks have been introduced which offer voice,
video and data services. Comms Express can assist with PSTN connection
modules that feature PSTN master sockets.

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