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D-8
Cisco ONS 15454 Installation and Operations Guide
November 2001
Appendix D Glossary
Managed device
A network node that contains an SNMP agent and resides on a managed network. Managed devices
include routers, access servers, switches, bridges, hubs, computer hosts, and printers.
Managed object
In network management, a network device that can be managed by a network management protocol.
Sometimes called an MIB object.
Mapping
A logical association between one set of values, such as addresses on one network, with quantities or
values of another set, such as devices on another network.
MIB
Management Information Base. Database of network management information that is used and
maintained by a network management protocol such as SNMP or CMIP. The value of a MIB object can
be changed or retrieved using SNMP or CMIP commands, usually through a GUI network management
system. MIB objects are organized in a tree structure that includes public (standard) and private
(proprietary) branches.
Multicast
Single packets copied by the network and sent to a specific subset of network addresses.
Multiplex payload
Generates section and line overhead, and converts electrical/optical signals when the electrical/optical
card is transmitting.
Multiplexing
Scheme that allows multiple logical signals to be transmitted simultaneously across a single physical
channel. Compare with Demultiplex.
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.