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N-ISDN (Narrowband Integrated Switch digital Network) was an attempt to replace the analog telephone system with a digital one. Unfortunately, the standardization process was too long and regarding to the technology progress in this area, once the standard was finally agreed, it was obsolete.
It generally uses 64 kbit/s channel as the basic unit of switching. It has a circuit switching orientation. Its major contribution was Frame Relay. It describes telecommunication that carries voice information in a narrow band of frequencies.
N-ISDN basic rate is too low so for home as for business today. N-ISDN may be partly saved, but by an unexpected application: Internet access. Various companies now sell ISDN adapters that combine the 2B + D channels into a single 144 kbit/s digital channel. Many Internet providers also support these adapters. So the people can access Internet over a 144 kbit/s digital link, instead of a 28.8 kbit/s analog modem link and for affordable price that may be a niche for N-ISDN for the next few years.
N-ISDN is also known as Normal-ISDN.
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