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Terms and definitions
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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.
NE ACTY - Near End Activity
An LED on the faceplate of the SYSCTL circuit pack.
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.
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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).
OC-3c (STS-3c)
Optical Carrier Level 3 Concatenated Signal. Low-speed broadband equivalent to three STS-1s
linked together with a single path overhead.
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365-372-603R2.0
Issue 1 January 2009
G L- 2 3
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