End of PSTN lines: Where do things stand?

Since 2018, Orange, France Telecom's line manager, has stopped offering new PSTN lines. The incumbent plans to close them from 2023 until 2030, proceeding by geographical areas.

In 2019, Orange closed digital lines, including digital voice (T0 or T2), leading to the gradual abandonment of digital technologies.

Between 2023 and 2026, the gradual shutdown of PSTN lines forces many businesses to migrate to modern technologies, for example VoIP and other Internet solutions.

In 2030, the transition will be completed with the definitive closure of PSTN lines. This will favour communications via IP and Internet networks. This transition will enable telecommunications infrastructures to be modernised, marking the end of traditional PSTN lines.

15 November 2018 = Closure of analogue lines
15 November 2019 = Commercial closure of digitised lines (digital voice also known as T0 or T2)
... 2023 = Gradual shutdown of PSTN lines
2023 ... 2030 = Final and gradual end via plates (switch from PSTN to IP)

*Orange



The end of PSTN lines marks an evolution in communications technologies.

It has to be said that switching from old telephone lines means changing the code and structures. This makes it possible to follow the new rules of communication with the Internet and IP networks.



Source* : Fédération Française des Télécoms

The Switched Telephone Network (PSTN) is coming to an end for a number of reasons:

• The PSTN has become obsolete : Modern communications are generally based on packet switching, such as Voice over IP (VoIP). 5G, offering clear advantages in terms of flexibility, quality and speed. The old PSTN lines were limited in terms of data transfer speed.
   

• The use of the copper network: Several factors are converging to gradually reduce the use of the copper network over the coming decades, in particular new technologies. These new technologies, such as fibre optics, digital networks and communications solutions are based on IP (Internet Protocol) means of communication.

  In addition, the increase in the number of antennas for wireless communications will be decisive. The rollout of fibre optics has accelerated the obsolescence of PSTN lines, encouraging the transition to more modern communications technologies. In addition, the growth of devices using M2M chips is contributing to a reduction in the use of the copper network. These devices are adapted to modern communication technologies.
   

• The cost : Maintaining the PSTN is becoming increasingly expensive for telecoms operators. What's more, as the PSTN is no longer marketed or manufactured anywhere in the world, repairs are becoming virtually impossible.
   
• The incompatibility of the T socket : Although the PSTN is coming to an end, the copper wire and the T socket will not disappear. However, it will no longer be possible to plug in a telephone directly. The phone will have to be connected to an internet box plugged into a wall socket.
   
• Services: Consumers and businesses are demanding more versatile services. Such as text messaging, video conferencing and social network communication. The PSTN simply cannot meet these needs.
   
• The recommendations:Governments and the'ARCEP, (Aauthorité de Régulation des Communications Électroniques et des Postes), are encouraging the transition to digital networks to improve efficiency and security. As the old PSTN networks were obsolete, this decision was taken to meet current needs.

France is not the only country affected by the end of PSTN lines. This end is already in effect in Switzerland. In the UK, since 2020, it has no longer been possible to obtain new lines. In the United States, despite network management being more complex because it is decentralised to the level of each state, the end began in 2020.

PSTN stands for Rnetwork Ttelephone Ccommuted.

PSTN is the historic analogue technology that provided voice communications between two distant users.

Once a must for fixed telephone calls, the Switched Telephone Network (PSTN), is now a relic of the past. As communications technologies advance, the obsolescence of PSTN lines is becoming increasingly irreversible.



In fact, almost all French households used the famous "T" socket, which was used to connect telephones, ADSL filters, modems, faxes, etc.

The technological upgrade to IP is essential for telephony services. The transition to IP technology improves telephony services over long distances, supporting the France Très Haut Débit plan.

To wit, upgrading public service websites is part of the France Très Haut Débit plan.

The authorities are encouraging the migration of PSTN lines, to IP technology, These ensure the continuity of online public services with reliable connectivity throughout the territory.

Analogue network line technology consists of a pair of wires that form a loop.

To explain very simply, it works in 3 stages:

1. Answering a call: as soon as you pick up your phone, the loop closes
2. During the call: The membrane of the handset vibrates causing a coil to vibrate. This creates an electrical current.
3. Electrical signal: The voice is transformed into an electrical signal. This is when the telephone switches (equipment) come into play. This equipment transfers the voice onto the PSTN network.

Today, PSTN lines work differently.

With Internet-based digital technologies, these new lines use the transmission of packets of data. Put more simply, information is chopped up into small pieces (packets) and sent over the network in a more flexible way.

In this way, it allows bandwidth to be shared securely between several users. This makes communication faster, more reliable and better adapted. Because these technologies are more versatile, they also allow voice, data and video services over a single line.

BEFORE

Here is the architecture of the PSTN network

APRÈS

Here is the architecture of the current network.

The PSTN was for a long time the traditional circuit-switched network on which fixed lines were based. However, rapid technological change has made this network obsolete. It has led to the need for new, more efficient communications networks tailored to today's needs.

Modern communications networks are mainly based on communication through the transmission of data packets. Today's computer networks use packet switching. Unlike circuit switching, which required a dedicated connection throughout the communication.

Artificial intelligence has played a key role in the implementation of these new networks. It enables more sophisticated management of traffic and resources, guaranteeing better quality of service for communications. The gradual abandonment of PSTN lines in favour of these new-generation networks marks an undeniable turning point in the telecommunications sector. This, offering consumers faster and more reliable communications services.

To sum up, the end of PSTN lines, is the result of the evolution of communications technologies towards communications networks. These communications networks are based on the transmission of data packets, exploiting artificial intelligence for better traffic management. This transition is making it possible to offer users more efficient communications services.

For more information on the end of PSTN lines: visit the arcep website.