Cisco Systems 78-11450-03 specifications Alarm and Minor alarm, Single-mode fiber, GL-8

Glossary

M

M13	Generic term for equipment that multiplexes DS1s into DS3s. Sometimes used to describe a specific
	DS3 multiplex format. Some standards use this term to describe a synchronous multiplexing format
	also know as SYNTRAN. In many cases M13 does not refer to the SYNTRAN format, but instead
	refers to the format also known as M23.

M23

MAC

MAC address

A method of multiplexing four DS1 signals into a DS2 signal, then multiplexing seven DS2 signals into a DS3 signal.

Media Access Control. Lower of the two sublayers of the data link layer defined by the IEEE. The MAC sublayer handles access to shared media.

Standardized data link layer address that is required for each port or device that connects to a LAN. Other devices in the network use these addresses to locate specific ports in the network, and to create and update routing tables and data structures. MAC addresses are 6 bytes long and are controlled by the IEEE. Also known as a hardware address, MAC-layer address, or physical address.

Major alarm	One of a group of alarm conditions that are considered the second most severe of all reportable alarms.
	Major alarms affect several subscribers who connect to the reporting node. You can use the show
	facility-alarm status IOS command to obtain more information about the problem. See also Critical
	alarm and Minor alarm.

MAN

Management Information Base

Media Access Control

Metropolitan-area network

MIB

Minor alarm

Metropolitan-area network. A network that spans a metropolitan area. Generally, a MAN spans a larger geographic area than a LAN, but a smaller geographic area than a WAN. Compare with LAN and WAN.

See MIB.

See MAC.

See MAN.

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-based network management system. MIB objects are organized in a tree structure that includes public (standard) and private (proprietary) branches.

One of a group of alarm conditions that are considered the third most severe of all reportable alarms. Minor alarms affect a single or small number of subscribers who connect to the reporting node. You can use the show facility-alarm status IOS command to obtain more information about the problem. See also Critical alarm and Major alarm.

MLP		Multilink Point-to-Point Protocol. A method of splitting, recombining, and sequencing datagrams
		across multiple logical data links.
MMF		Multimode fiber. Optical fiber supporting propagation of multiple frequencies of light. See also
		Single-mode fiber.
MPLS		Multiprotocol Label Switching. An emerging industry standard upon which tag switching is based.
		Cisco uBR10012 Universal Broadband Router Hardware Installation Guide
	GL-8	78-11450-03 Rev.B0