Public Switched Telecom Network; old style switched voice telecoms...more on PSTN
Public Switched Telephone Network, details ...
Public Switched Telephone Network - public telephone service based on circuit switching technology (usually the BT network).
Public switched telephone network, the telco owned dial up network.
Public Switched Telephone Network
Public Switched Telephone Network - plain old telephone service, POTS.
Public Switched Telephone Network. The public telephone system, including telephone, local and trunk lines, and exchanges.
The regular old-fashioned telephone system.
(Public Switched Telephone Network) The analogue telephone system that operates in most countries.
Public Switched Telephone Network
Public Switched Telephone Network
Public Switched Telephone Network is the concentration of the world's public circuit-switched telephone networks. Originally a network of fixed-line analog telephone systems, the PSTN is now almost entirely digital, and now includes mobile as well as fixe
Public Switched Telephone Network.
(Public Switched Telephone Network) -- The worldwide public telephone systems.
Public Switched Telephone Network