Cisco Systems Cisco uBR10012 manual GL-9

Glossary

Multicast

Multilink

Point-to-Point

Multimode fiber

Multiplexing

Multiprotocol Label Switching

Single packets copied by the network and sent to a specific subset of network addresses. These addresses are specified in the Destination Address field. Compare with Broadcast and Unicast.

See MLP.

See MMF.

An activity in which multiple logical signals are transmitted simultaneously across a single physical channel.

See MPLS.

N

NEBS	Network Equipment Building Systems. The Telcordia (formerly Bellcore) requirements for equipment
	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.

Network Equipment Building Systems

Network termination unit

Nonvolatile RAM

NTU

See NEBS.

See NTU.

See NVRAM.

Network terminating unit. The network equipment that connects directly to the data terminal equipment.

NVRAMNonvolatile RAM. RAM that retains its contents when a unit is powered off.

O

OC	Optical carrier. A series of physical protocols (OC-1, OC-2, OC-3, and so forth), defined for SONET
	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).

ODL

OIR

Optical data link.

Online insertion and removal. Feature that permits the addition, replacement, or removal of cards without interrupting the system power, entering console commands, or causing other software or interfaces to shut down. Same as hot-swapping.

Online insertion and		See OIR.
removal
		Cisco uBR10012 Universal Broadband Router Hardware Installation Guide
	OL-18259-01		GL-9