Specifications

Glossary
GL-8
Cisco ONS 15454 Troubleshooting and Maintenance Guide
November 2001
N
NE
Network Element. In an Operations Support System, a single piece of telecommunications equipment used to perform a
function or service integral to the underlying network.
Network number
Part of an IP address that specifies the network where the host belongs.
NMS
Network Management System. System that executes applications that monitor and control managed devices. NMSs provide
the bulk of the processing and memory resources required for network management.
Node
Endpoint of a network connection or a junction common to two or more lines in a network. Nodes can be processors,
controllers, or workstations. Nodes, which vary in routing and other functional capabilities, can be interconnected by links, and
serve as control points in the network. Node is sometimes used generically to refer to any entity that can access a network. In
this manual the term “node” usually refers to an ONS 15454.
O
OAM&P
Operations, Administration, Maintenance, and Provisioning. Provides the facilities and personnel required to manage a
network.
Optical amplifier
A device that amplifies an optical signal without converting the signal from optical to electrical and back again to optical
energy.
Optical receiver
An opto-electric circuit that detects incoming lightwave signals and converts them to the appropriate signal for processing by
the receiving device.
Orderwire
Equipment that establishes voice contact between a central office and carrier repeater locations.
Output contacts (alarms)
Triggers that drive visual or audible devices such as bells and lights. Output contacts can control other devices such as
generators, heaters, and fans.
P
Passive devices
Components that do not require external power to manipulate or react to electronic output. Passive devices include capacitors,
resisters, and coils.