GL-14
Issue 9 October 1998
363-206-204
GLOSSARY
Node
In SONET a node is a line terminating element.
Non-Revertive
A protection switching mode in which, after a protection switch occurs, the equip-
ment 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.)
NRZ
Nonreturn to Zero.
NSA
Non Service Affecting. An occurrence or activity in a system where there is no
interruption of transmission of the payload traffic.
NSAP
Network Services Access Point — An address that identifies a network element.
Used for subnetwork communication using the OSI protocol.
O
OAM&P
Operations, Administration, Maintenance, and Provisioning
OC, OC-n
Optical Carrier — The optical signal that results from an optical conversion of an
(electrical) 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. Currently, this circuit pack is inserted into the AUXCTL slot.
OI
Operations Interworking. The ability of equipment from different vendors to work
together in a system.
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