Alcatel-Lucent 1665 Installation Manual page 400

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.
OC-12
Optical Carrier Level 12 Signal (622 Mb/s).
OC-12c (STS-12c)
Optical Carrier Level 12 Concatenated Signal. High-speed broadband equivalent to twelve STS-1s linked
together with a single path overhead.
OC-48
Optical Carrier Level 48 Signal.
Operations Interface
Any interface that provides information on the system performance or control. These include the equipment
LEDs, SYSCTL faceplate, and office alarms.
OS - Operations System
A central computer-based system used to provide operations, administration, and maintenance functions.
OSI - Open Systems Interconnection
Referring to the OSI reference model, a logical structure for network operations standardized by the
Internation Standards Organization (ISO).
OSGNE - Operations System Gateway Network Element
An OSGNE serves as a single interface to the OS for NEs in the same subnetwork using X.25 interfaces.
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G L - 2 2 365-372-304R7.1
Issue 1, November 2007