Glossary
GL-14 Issue 3 June 2000
NSAP
Network Services Access Point — An address that identifies a network element. Used for mainte-
nance subnetwork communication using the OSI protocol.
NTF
No Trouble Found
O
OAM&P
Operations, Administration, Maintenance, and Provisioning
OC, OC-n
Optical Carrier — The optical signal that results from an optical conversion of an STS signal; that is,
OC-1 from STS-1 and OC-n from STS-n.
OC-1
Optical Carrier Level 1 Signal (51.84 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 signal equivalent to three
STS-1s linked together with a single path overhead.
OC-12
Optical Carrier Level 12 Signal (622 Mb/s)
OHCTL
The overhead controller circuit pack provides user access to the SONET overhead channels.
OLIU
Optical Line Interface Unit
OOF
Out of Frame
OOL
Out of Lock
Operations Interface
Any interface that provides information on the system performance or control. These include the
equipment LEDs, user panel, CIT, office alarms, and all telemetry interfaces.
OPS/INE
Operations System/Intelligent Network Element
OS
Operations System — A central computer-based system used to provide operations, administration,
and maintenance functions.
OSMINE
Operations Systems Modifications for the Integration of Network Elements
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