Narrowband Integrated Services Digital Network: Services include basic rate interface (2B+D or BRI) and primary rate interface (30B+D - Europe and 23B+D - North America or PRI). Supports narrowband speeds at/or below 1.5 Mbps.
N-ISDN
Meaning of N-ISDN in English
ATM Forum English vocabulary. Английский словарь организации Форум ATM. 2012