NT termination – serves for the interface of digital network ISDN on the main access (the 2-wire Uko interface) and ISDN terminals (the 4-wire So interface). The main characteristics of this network terminus are:

• • small dimensions
• • 1 S₀ interface for connection of ISDN terminals
• • Operate without local power supply by providing power on S0 to the bus of one consumer

Image 15: NT termination