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Modernz 42
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*********************************************************
* *
* Database of Network Terms *
* Part 12 *
* *
* *
* Another Modernz Presentation *
* *
* by *
* Digital-demon *
* *
* (C)opyright March 20, 1992 *
* *
*********************************************************
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NAD
===
Node Assembler/Debugger. A tool used to generate Engine source code and
to aid in remote troubleshooting.
NAD Image Binary (NIB)
======================
Machine-executable code (object code) assembled by NAD. It is a
combination of the Tymfile, the source file, and the initialization
file, all of which structure the machine (Kernel and slots). Also
refers to a specific file format that NAD Version 1 uses on the
TYMCOM-X. NAD Version 2 runs under UNIX and generates the e.out
formatted file.
NAD-68K
=======
A UNIX version of NAD that translates Engine assembler source code to
Motorola 68020 object code, which is loaded and executed in the Turbo
Engine.
NAK, NACK
=========
Negative Acknowledgment. A condition indicating that the previous
transmission block was in error and that the receiver is ready to
accept a retransmission of the erroneous block. Also, it can mean not
ready to multipoint (station selection) or line bid (initialization
sequence) in point-to-point operation.
nano
====
In the metric system, a prefix meaning one billionth (1/1,000,000,000).
native code
===========
A program written in the language of the computer that will execute the
program.
NCH
===
Network Component Hierarchy. In CMF, a representation of a network's
logical structure in which network components (partitions, clusters,
processors, and slots) are stored in hierarchical relationship to each
other.
NCP
===
Network Control Program. Manages the allocation, use, and diagnostics
of performance of all lines (in the network) and of the availability of
the terminals at the ends of the network.
Also refers to one component of Systems Network Architecture (SNA).
NCS
===
National Communications System.
Needle
======
The Supervisor-to-Node Code message containing the appropriate
(external) circuit path information (origination/destination node,
host, and port numbers, and codes indicating the circuit type and
speed). Each node builds its part of the circuit based on the
information in the Needle as it threads its way through the network
carrying the data.
There are two types of Needles: TYM2 (originates at the Supervisor to
build the network circuit) and ISIS (builds intra-ISIS circuit from
Node Code to the destination slot).
Negative Acknowledgment (NAK or NACK)
=====================================
A condition indicating that the previous transmission block was in erro
and that the receiver is ready to accept a retransmission of the
erroneous block. Also, it can mean not ready to a multipoint (station
selection) or line bid (initialization sequence) in point-to-point
operation.
neighbor node
=============
A node to which another node is connected. The two nodes are
"neighbors."
NEM
===
Network Event Monitor. A program residing in an ISIS slot, which, in
conjunction with TMCS, builds a circuit to the Supervisor ERLOG slave
program to collect the Error and Event messages stored on the
Supervisor disk.
Net Message
===========
A BT North America product that displays informational or instructional
messages on a user's terminal when the user's host is nonfunctional.
This facility allows the end user immediate access to host status
information.
Netport
=======
A program that acts as a slave to the network-resident ELF program
under CMF (UNIX) environments. Under the direction of ELF, Netport
retrieves and formats image files for transportation to ELF.
NETVAL
======
Network Validations. A program used to validate TYMNET network users
and to determine what level of access a user has within the network.
NETVAL runs in an ISIS slot.
NetWare
=======
LAN software developed by Novell. Used for microcomputers, NetWare
enhances the token ring performance of a system. Different versions of
NetWare can accommodate star, string of stars, Token ring, and bus
hardware configurations. See Local Area Network.
network
=======
Any system designed to provide one or more access paths for
communications between users at different geographic locations. Also,
a series of points connected by communications channels.
Network Component Hierarchy (NCH)
=================================
In CMF, a representation of a network's logical structure in which
network components (partitions, clusters, processors, and slots) are
stored in hierarchical relationship to each other.
Network Console (NTCN)
======================
A program (now a part of TMCS) that saves the history for a user who
changes the configuration parameters for an X.25/X.75 slot, using the
X.25/X.75 Operations Manager (XOM). The user interface is commands in
the form of words rather than hexadecimal code. Also used in the event
an X.25/X.75 slot has to be reloaded.
Network Control Program (NCP)
=============================
Manages the allocation, use, and diagnostics of performance of all
lines (in the network) and of the availability of the terminals at the
ends of the network. Also refers to one component of Systems Network
Architecture (SNA).
Network Event Monitor (NEM)
===========================
A program residing in an ISIS slot, which, in conjunction with TMCS,
builds a circuit to the Supervisor ERLOG slave program and Network
Console to collect the Error and Event messages stored on the
Supervisor disk.
Network Job Entry (NJE)
=======================
The process of submitting a job to a remote system for execution.
Network level
=============
Level 3 of the Open Systems Interconnection (OSI) model. The Network
level switches and routes information, establishes a logical
association of remote hosts and provides indication of a remote
connection.
network mode
============
A class of CMF commands used to maintain the Network Component
Hierarchy (NCH) system generation files and to generate code.
network platform
================
Off-the-shelf equipment that serves as a basic building block whereby
future enhancements can be added to a network.
Network Position Table (NPT)
============================
A table that displays a user's current position path within a Network
Component Hierarchy (NCH). Includes network name, partition name,
cluster name (including node and Kernel host number), processor name,
and slot name.
Network Services Manager (NSM)
==============================
A BT North America integrated software product that provides a single,
user-friendly interface to the various TYMNET services. With a single
login, a user can be automatically connected to management resources
previously available only through multiple manual logins. For example,
a customized list of services available through an NSM menu might
include TymValidate, X.25/X.75 Operations Manager (XOM), TYMCOM
Operations Manager (TOM), Net Message, and the Information Service.
Network Terminal Number (NTN)
=============================
A 10-digit number used to identify a destination call. This number is
required for international calls (per CCITT, X.25 protocol). Similar
to a telephone number.
network topology
================
The mapping of the connection of nodes in a network.
Network User Identification (NUI)
=================================
An identification code (alphanumeric) that is universally used by
network customers, which authorizes them access to dial-up services
in a public or shared network. The NUI is obtained from the local
Telecommunication Administration (TA) operating the network in each
country.
Network Validations (NETVAL)
============================
A program used to validate TYMNET network users and to determine what
level of access a user has within the network. NETVAL runs in an
ISIS slot.
NFMI
====
Next Fill Message Index.
NIB
===
NAD Image Binary. Machine-executable code (object code) assembled by NA
It is a combination of the Tymfile, the source file, and the
initialization file, all of which structure the machine (Kernel and
slots). Also refers to a specific file format that NAD, Version 1 uses
on the TYMCOM-X. NAD Version 2 runs under UNIX and generates the e.out
formatted file.
NJE
===
Network Job Entry. The process of submitting a job to a remote system
for execution.
NMC
===
Network Management and Control.
node
====
A communications processor configured with BT North America software
that functions in a TYMNET network. The node must run Node Code and
communicate with the Supervisor. Also, a point of connection in the
network where various links come together (host processors,
communications controllers, cluster controllers, and/or terminals).
Generally, contains a switching element used to direct traffic.
Node Assembler/Debugger (NAD)
=============================
A tool used to generate or assemble code and to aid in remote
troubleshooting.
Node Assembler/Debugger (NAD) DDT
=================================
A troubleshooting technique using both NAD and DDT functions.
Primarily, NAD DDT is used to troubleshoot ISIS slots.
Node Assembler/Debugger-68K (NAD-68K)
=====================================
A UNIX version of NAD that translates Engine assembler source code to
Motorola 68020 object code, which is loaded and executed in the Turbo
Engine.
node cluster
============
A large-capacity node formed by several Engines placed side-by-side,
and interconnected by high-bandwidth coaxial links or OCLs.
Node Code
=========
The software that interfaces a node to the rest of the network. It
contains basic instructions for assembling and disassembling packets
and building circuits.
node number
===========
An octal number (up to five digits) assigned to a BT North America
communications processor.
non-ISIS node
=============
A node that does not contain the ISIS operating system. Examples are
a Standalone CONSAT or Standalone Switcher.
nonswitched
===========
A leased or hardwired connection line permanently installed between two
points. Also called leased line or private line.
nontransparent mode
===================
Transmission of characters in a defined character format, such as ASCII
or EBCDIC, in which all defined control characters and control characte
sequences are recognized and treated as such.
NPA
===
No Ports Available.
NPT
===
Network Position Table. A table that displays a user's current position
path within a Network Component Hierarchy (NCH). Includes network
name, partition name, cluster name (including node and Kernel host
number), processor name, and slot name.
NR
==
Frame Receive.
NRZ
===
Non-Return-to-Zero.
NRZI
====
Non-Return-to-Zero-Inverted.
NS
==
Frame Sent.
ns
==
Nanosecond.
NSM
===
Network Service Manager. A BT North America integrated software product
that provides a single, user-friendly interface to the various TYMNET
services. With a single login, a user can be automatically connected
to management resources previously available only through multiple
manual logins. For example, a customized list of services available
through an NSM menu might include TymValidate, X.25/X.75 Operations
Manager (XOM), TYMCOM Operations Manager (TOM), Net Message, and the
Information Service.
NTCN
====
Network Console. A program (now part of TMCS) that saves the history
for a user who changes the configuration parameters for an X.25/X.75
slot, using the X.25/X.75 Operations Manager (XOM). The user interface
is commands in the form of words rather than hexadecimal code. Also
used in the event an X.25/X.75 slot has to be reloaded.
NTD
===
Network Technology Development.
NTN
===
Network Terminal Number. A 10-digit number used to identify a
destination call. This number is required for international calls (per
CCITT X.25 protocol). Similar to a telephone number.
NUI
===
Network User Identification. An identification code (alphanumeric) that
is universally used by network customers, which authorizes them access
to dial-up services in a public or shared data network. The NUI is
obtained from the local Telecommunications Administration (TA)
operating the network in each country.
null modem
==========
A device directly connecting two DTE devices. See crossover cable.
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Disclaimer
~~~~~~~~~~
This publication is for informational purposes ONLY.
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