Cisco Universal Broadband Router uBR10012 Hardware Installation Manual page 262

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
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
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.
MAC address
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.
One of a group of alarm conditions that are considered the second most severe of all reportable alarms.
Major alarm
Major alarms affect several subscribers who connect to the reporting node. You can use the show
facility-alarm status
alarm
Metropolitan-area network. A network that spans a metropolitan area. Generally, a MAN spans a larger
MAN
geographic area than a LAN, but a smaller geographic area than a WAN. Compare with
See MIB.
Management
Information Base
See MAC.
Media Access
Control
See MAN.
Metropolitan-area
network
Management Information Base. Database of network management information that is used and
MIB
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 alarm
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
Multilink Point-to-Point Protocol. A method of splitting, recombining, and sequencing datagrams
MLP
across multiple logical data links.
Multimode fiber. Optical fiber supporting propagation of multiple frequencies of light. See also
MMF
Single-mode
Multiprotocol Label Switching. An emerging industry standard upon which tag switching is based.
MPLS
Cisco uBR10012 Universal Broadband Router Hardware Installation Guide
GL-8
IOS command to obtain more information about the problem. See also
and Minor alarm.
Critical alarm and Major
fiber.
alarm.
Critical
LAN and WAN.
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