Cisco Universal Broadband Router uBR10012 Hardware Installation Manual page 263

Single packets copied by the network and sent to a specific subset of network addresses. These
Multicast
addresses are specified in the Destination Address field. Compare with
See MLP.
Multilink
Point-to-Point
See MMF.
Multimode fiber
An activity in which multiple logical signals are transmitted simultaneously across a single physical
Multiplexing
channel.
See MPLS.
Multiprotocol Label
Switching
N
Network Equipment Building Systems. The Telcordia (formerly Bellcore) requirements for equipment
NEBS
deployed in a central office environment. Covers spatial, hardware, crafts person interface, thermal, fire
resistance, handling and transportation, earthquake and vibration, airborne contaminants, grounding,
acoustical noise, illumination, EMC, and ESD requirements.
See NEBS.
Network Equipment
Building Systems
See NTU.
Network
termination unit
See NVRAM.
Nonvolatile RAM
Network terminating unit. The network equipment that connects directly to the data terminal
NTU
equipment.
Nonvolatile RAM. RAM that retains its contents when a unit is powered off.
NVRAM
O
Optical carrier. A series of physical protocols (OC-1, OC-2, OC-3, and so forth), defined for SONET
OC
optical signal transmissions. OC signal levels put STS frames onto fiber-optic lines at a variety of
speeds. The base rate is 51.84 Mbps (OC-1); each signal level thereafter operates at a speed divisible
by that number (thus, OC-3 runs at 155.52 Mbps).
Optical data link.
ODL
Online insertion and removal. Feature that permits the addition, replacement, or removal of cards
OIR
without interrupting the system power, entering console commands, or causing other software or
interfaces to shut down. Same as hot-swapping.
See OIR.
Online insertion and
removal
OL-18259-09
Cisco uBR10012 Universal Broadband Router Hardware Installation Guide
Glossary
Broadcast and Unicast.
GL-9