Lucent Technologies Metropolis DMXplore, Руководство по установке

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G L O S S A R Y
G L - 2 4
365-372-334 R2.0
Issue 4, November 2004
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Multiplexing
The process of combining several distinct digital signals into a single composite
digital signal.
N NE - Near End
The network element the user is at or working on. Also called local.
NE - Network Element
The basic building block of a telecommunications equipment within a
telecommunication network that meets SONET standards. Typical internal
attributes of a network element include: onr or more high- and low-speed
transmission ports, built-in intelligence, synchronization and timing capability, and
access interfaces for use by technicians and/or operation systems. In addition, a
network element may also include a time slot interchanger.
NMA - Network Monitoring and Analysis
An operations system designed by Telcordia Technologies which is used to
monitor network facilities.
NMON - Not Monitored
A provisioning state for equipment that is not monitored or alarmed.
Node
In SONET, a node is a line terminating element.
Non-Revertive
A protection switching mode in which, after a protection switch occurs, the
equipment remains in its current configuration after any failure conditions that
caused a protection switch to occur clear or after any external switch commands
are reset. See Revertive.
NSAP - Network Services Access Point
An address that identifies a network element. Used for maintenance subnetwork
communication using the OSI protocol.
O OC, OC-n - Optical Carrier
The optical signal that results from an optical inversion of an STS signal; that is,
OC-1 from STS-1 and OC-n from STS-n.
OC-1
Optical Carrier Level 1 Signal (51.844 Mb/s).
OC-3
Optical Carrier Level 3 Signal (155 Mb/s).