What is ISDN?
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ISDN is a communication protocol use to establish a networking connection.
It works somewhat like a modem – a modem generates and listens to sound in order to transmit data. ISDN works over a digital phone line and instead of audible sounds it uses electronic pulses.
Other than that it’s pretty much like another modem. It connects to a service provider and links your computer or your network to whatever the service provider accesses.
ISDN was sometimes used for household internet (I did in the 90s) but was/is more common for either direct connections between business locations or for connecting remote users into a private business network over a dedicated phone line.
I’m pretty sure it’s dropping in popularity rapidly – it has a lot of limits – cost and speed being two big ones.
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