The telecommunications industry loves its acronyms, but it can all be a bit confusing with so many different products and standards available to provide voice and data services. Luckily for you, Arrow is here to make things a bit clearer!
Two of the oldest methods for voice service delivery are public switched telephone network (PSTN) and integrated services for digital network (ISDN).
Also jokingly known as plain old telephone service (POTS), PSTN is the phone line most of us grew up with at home.
PSTN is delivered to the premises via twisted copper wire pairs (residential and business). Although the core network is almost entirely digital these days, the signal is still usually analogue from the exchange to the end user.
“Integrated services” refers to the ability to deliver a minimum of two simultaneous connections over a single line. ISDN has been very popular for businesses that want to transmit voice, data, video and fax and caters to large organisations so they don’t need to install and manage multiple PSTNs.
ISDN comes in two main forms:
Both PSTN and ISDN can have their network access restricted to stop particular calls, such as mobile, international, 1300 etc., from being made. Each system has a range of added value products. Hopefully this gives you a better understanding of what each of these systems can do.