Network Termination 1 (NT1) or Network Termination type 1 refers to equipment in an Integrated Services Digital Network (ISDN) that physically and electrically terminates the network at the customer's premises. [1][2] The NT1 network termination provides signal conversion and timing functions which correspond to layer 1 of the OSI model. [2]

The phone company terminates each 2-wire ISDN line at the customer premises, called the Subscriber/ Termination (S/T) interface, at a box called the Network Terminator (NT1).

Network Termination-1 (NT1): A physical layer device that separates user premises from the phone company. Network Termination-2 (NT2): Functions as per OSI layers 2-3.

The NT1B-300TC-TSG is a specially designed version of the Teo NT1B-300TC compact ISDN Network Termination.

NT2 devices are smart ISDN devices that make multilayer decisions on the ISDN network, such as on routers or private branch exchanges (PBXs). Devices known as NT12s are devices that integrate both functions of the NT1 and NT2 into a single device.

6 days ago · • Network Termination 1 (NT1) is typically a customer's device that is used to implement the physical layer specification into the ISDN Network (or the NT2 device). This is the U Reference point that connects through to the telco. This operates at Layer 1 of the OSI Model.

The ISDN NT is the boundary between the Internet Telephony Service Provider's network and the customer's network: it connects the two and converts the data to the proper format. NT stands for Network Termination: this term concludes the terms for NT1 and NT2. NT1 is for the physical connection, NT2 is for the logical connection (Figure 1).

ISDN - ready (TE1) components require an NT1 termination only; ISDN - free (TE2) components require both a Terminal Adapter (TA) and an NT1 termination. What are ISDN “references”?

Telenet’s ISDN Network Termination for basic rate access is the main gate to the world of ISDN. It enables subscribers to use services such as high-speed transmission of data, text and video signals in digital format over an access line in addition to voice transmission.

ISDN Reference Rate (R): Between Uses X or V series System (S): Between Separates user Terminal (T): Between Separates network from User (U): U interface Defined in North TE1 TE1