Not Protected Domain
The Not Protected Domain for the NMS contains all the network elements that are
managed by that NMS and are not currently protected by another NMS. If the NMS
fails, the network elements in this domain are not managed by any NMS. 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
OAM&P
Operations, Administration, Maintenance and Provisioning
OC-n
Optical Carrier, Level n
ODF
Optical Distribution Frame
ODU
Optical Demultiplexer Unit
OFS
Out of Frame Second
OI
Optical Interface
OMU
Optical Multiplexer Unit
OOF
Out Of Frame
Glossary
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365-312-847R4.0
Issue 4, November 2006
Lucent Technologies - Proprietary
See notice on first page
GL-19