Alcatel-Lucent 1643 AMS Applications And Planning Manual page 304

Glossary
Non-revertive switching
In non-revertive switching there is an active and a standby high speed line, circuit pack,
etc. When a protection switch occurs, the standby line, circuit pack, etc. is selected
which causes the old standby line, circuit pack, etc, to be used for the new active line,
circuit pack, etc. The original active line, circuit pack, etc. becomes the standby line,
circuit pack, etc. This status remains in effect when the faults clears. Therefore, this
protection scheme is non-revertive in that there is no switch back to the original status
that was in effect before the fault occurred.
Non-synchronous
The essential characteristic of timescales or signals such that their significant instants do
not necessarily occur at the same average rate.
Not Protected Domain
The Not Protected Domain for the Lucent OMS contains all the network elements that
are managed by that Lucent OMS and are not currently protected by another Lucent
OMS. If the Lucent OMS fails, the network elements in this domain are not managed by
any Lucent OMS. See also Geographic Redundancy.
NPI
Null Pointer Indication
NRZ
Non-Return to Zero
NSA
Non-Service Affecting
NTU
Network Termination Unit
NUT
Non pre-emptible Unprotected Traffic
NVM
Non-Volatile Memory
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O OA
Optical Amplifier
OAA case tools
A software package/tool to aid the process of requirements, analysis, design and
implementation of object orientated systems.
OAM&P
Operations, Administration, Maintenance and Provisioning
OC-n
Optical Carrier, Level n
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GL-20 Alcatel-Lucent - Proprietary
See notice on first page
365-312-801R7.2
Issue 3, May 2007