Lucent Technologies LambdaUnite Installation Manual page 341

NEBS
Network Equipment-Building System requirements, U.S. Telecom Requirements dealing with
EMC/EMI, Environmental, Electrical safety.
nm
Nanometer (10
NMON (Not Monitored )
A provisioning state for equipment that is not monitored or alarmed.
No Request State
This is the routine-operation quiet state in which no external command activities are occurring.
Node
A network element in a ring or, more generally, in any type of network. In a network element
supporting interfaces to more than one ring, node refers to an interface that is in a particular
ring. Node is also defined as all equipment that is controlled by one system controller. A node
is not always directly manageable by a management system.
Non-Revertive Switching
In non-revertive switching, an active and stand-by line exist on the network. When a protection
switch occurs, the standby line is selected to support traffic, thereby becoming the active line.
The original active line then becomes the stand-by line. This status remains in effect even when
the fault clears. That is, there is no automatic switch back to the original status.
Non-Synchronous
The essential characteristic of time-scales or signals such that their corresponding significant
instants do not necessarily occur at the same average rate.
NORM
Normal
NPI
Null Pointer Indication
NPPA (Non-Preemptible Protection Access)
Non-preemptible protection access increases the available span capacity for traffic which does
not require protection by a ring, but which cannot be preempted.
NRZ
Nonreturn to Zero
NSA
Non-Service Affecting
NSAP Address (Network Service Access Point Address)
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365-374-059
Issue a, January 2002
–9
meters)
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