In Integrated Services Digital Networks (ISDN), a functional grouping of customer-premises equipment that includes functions that may be regarded as belonging to OSI Layer 1, i.e., functions associated with ISDN electrical and physical terminations on the user premises.
Note: The NT1 forms a boundary to the network and may be controlled by the provider of the ISDN services.

In Integrated Services Digital Networks (ISDN), an intelligent device that may include functionality for OSI Layers 1 through 3 (dependent on individual systems requirements).

The specific physical, i.e., real, or logical, i.e., virtual, arrangement of the elements of a network.
Note 1: Two networks have the same topology if the connection configuration is the same, although the networks may differ in physical interconnections, distances between nodes, transmission rates, and/or signal types.
Note 2: The common types of network topology are illustrated [refer to the… (Read More →)

[The] totality of protection mechanisms within a network, including hardware, firmware, and software, the combination of which is responsible for enforcing a security policy. [INFOSEC-99]

An internetwork administrative signaling mechanism in the call control procedure between packet switching public data networks.

1. In computer security, a penetration technique in which different communication networks are used to gain access to a data processing system to avoid detection and trace-back. [After 2382-pt.8]
2. [A] penetration technique in which different communication networks are linked to access an information system (IS) to avoid detection and trace-back. [INFOSEC-99]

In a computer networking environment, an application (program) that is centrally stored, e.g., on a server, and copies of which may be accessed on demand by a client and used temporarily (i.e., for a single session) by the client (e.g., a desktop computer).
Note: Multiple clients may make simultaneous use of a given network-launched application.

A Next Generation Network (NGN) is a packet-based network able to provide services including Telecommunication Services and able to make use of multiple broadband, QoS-enabled transport technologies and in which service-related functions are independent from underlying transport-related technologies. It offers unrestricted access by users to different service providers. It supports generalized mobility which will allow consistent and ubiquitous provision of… (Read More →)

Non-terrestrial networks (NTN) are networks or segments of networks that use either Uncrewed Aircraft Systems (UAS) operating typically between 8 and 50km altitudes, including High Altitude Platforms (HAPs) or satellites in different constellations to carry a transmission equipment relay node or a base station.

Synonym asynchronous network.