The device that terminates a 2 wire ISDN line and changes the U (2 wire) interface to the S/T (four wire) interface. In Some countries the telephone company supplies this and the customer plugs his equipment into the S/T interface. In the US the customer must supply the NT-1 and plug into the U interface. Many ISDN devices for use in the US include this circuit internally.
Network Termination 1. Located at the end-user side of an ISDN connection. This device represents the termination of the ISDN system at the end-user’s location.
Device that is required to connect ISDN terminal equipment to an ISDN line. The NT-1 connects to the two-wire line (twisted pair copper wiring) that your telephone company has assigned for your ISDN service. Your ISDN service will not work if the NT-1's plug is not connected to a working electrical outlet.
ISDN device that converts between the U-interface and S/T-interface. NT-1 has a jack for the U-interface from the wall and one or more jacks for the S/T-interface connection to the ISDN videophone or videoconferencing system. Uses an external power supply.
A network termination device which is used between an ISDN BRI line and the customers equipment. The NT-1 converts the telephone companies two wire ISDN circuit into a 4 wire interface to the equipment. See CSU
The device that connects to your ISDN hardware and also works as a converter between an ISDN U-interface and an ISDN S/T-Interface. An NT-1 converts a line from a 2-wire to a 4-wire connection. Some ISDN adapters have a NT-1 already built into them. This is easier and less expensive than an external NT-1, but it may prevent you from connecting other equipment to your ISDN line.
An NT-1 is a network device that terminates the ISDN line. An NT-1 is built into the U version of the OfficeConnect ISDN LAN Modem, for use in North America and other countries that do not require an external NT-1. The ISDN LAN Modem with the S/T interface is for use in Europe and other countries that do require the use of an external NT-1. Also see ISDN LAN Modem