"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M",
"N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"

NETWORK. A combination of electrical components. In a parallel circuit it is composed of two or more branches. An interconnected system of transmission lines that provides multiple connections between loads and sources.

NETWORK ARCHITETURE: 1. The design principles, physical configuration, functional organization, operational procedures, and data formats used as the bases for the design, construction, modification, and operation of a communications network.

Network Terminal Number (NTN): In the CCITT International X.121 format, the sets of digits that comprise the complete address of the data terminal end point.

Network Topologies: The structure or layout of the bus between the communication elements. There are 4 main types of bus topologies; 1. Point-to-Point, 2. Bus, 3. Ring, and 4. Star. Point-to-Point interface buses are used for very high speed interfaces. Complete Definition of Network Topologies.



NODE: In network topology, a terminal of any branch a network or an interconnection common to two or more branches of a network.

Non-Return-to-Zero Mark (NRZ-M): A binary encoding scheme in which a signal parameter, such as electric current or voltage, undergoes a change in a significant condition or level every time that a “one” occurs, but when a “zero” occurs, it remains the same.

Non-Return-to-Zero Space (NRZ-S): A binary encoding scheme in which a signal parameter, such as electric current or voltage, undergoes a change in a significant condition or level every time that a “zero” occurs, but when a “one” occurs, it remains the same.

Null character (NUL): In transmission systems, a control character (a) that is used to accomplish media fill stuffing or a time-fill stuffing in storage device or in a data transmission line and (b) that may be inserted and removed from a series of characters without affecting the meaning of the series. Note: The null character may affect the control of equipment or the format of messages.