A Media Access Control level address is a 48-bit number, often called the "physical address", "Ethernet address", or "hardware address", used at the lowest network layer. There are three standard formats used to express MAC-level addresses. For example, 2:60:8c:0:76:67, 02-60-8c-00-76-67, and 0260.8C00.7667 represent the same MAC-level address.
MAC
Media Access Control; Moves, Adds, Changes
MAG
Multimedia Advisory group
mail exploder
Part of an electronic mail delivery system which allows a message to be delivered to a list of addressees. Mail exploders are used to implement mailing lists. Users send messages to a single address (e.g., hacks@somehost.edu) and the mail exploder takes care of delivery to the individual mailboxes in the list.
mail gateway
A machine that connects two or more electronic mail systems (especially dissimilar mail systems on two different networks) and transfers messages between them. Sometimes the mapping and translation can be quite complex, and generally it requires a store-and-forward scheme whereby the message is received from one system completely before it is transmitted to the next system after suitable translations.
MALT
Mesa-lab Advanced LAN Technology (NETS project)
MAN
Metropolitan Area Network
MAPI
Messaging API
MAPR
Multiple Antenna PRofiler
MAR
Marshall Field Site, 2062 S. 66th Street, Boulder, CO 80303, a part of UCAR. Also known as MAR.
MAS
Modem Aggregation Services
MASnet
Mainframe and Server Network at NCAR. MASnet was decommissioned in late 1998.
Microelectronics Center of North Carolina, a non-profit company that runs NCREN. See http://www.ncren.net/
MCR
Minimum Cell Rate
MCS
Media Convergence Server
MCSE
Microsoft Certified System Engineer
MD5
Message Digest 5
MED
Multi-Exit Discriminator
medium
The material used to support the transmission of data. Examples include copper wire, coaxial cable, optical fiber, or electromagnetic wave (microwave).
MEF
Master Email File
Merit
Merit Network, Inc. maintains a routing registry called the
RADb (Routing Assets Database).
NETS pays Merit a yearly fee for update access to the RADb.
MERT
Medical Emergency Response Team
MetaCenter
The term MetaCenter refers to the collaboration of national supercomputing centers: CTC, NCSA, PSC, SDSC, NCAR.
MFS
Marshall Field Site, 2062 S. 66th Street, Boulder, CO 80303, a part of UCAR. Also known as MAR.
MGCP
Media Gateway Control Protocol
MIB
Management Information Base. A collection of objects that can be accessed via a network management protocol like SNMP.
MIB
Management Information Base
MIC
Media Interface Connector. The most common connector on the ends of FDDI cables.
MICA
Modem ISDN Channel Aggregation
MIF
Management Information Format
MIGS
Mainframe/Internet Gateway Server
MILNET
MILitary NETwork. Originally part of the ARPANET, MILNET was partitioned in 1984 to make it possible for military installations to have reliable and secure network service, while the ARPANET continued to be used for research.
MIME
Multipurpose Internet Mail Extensions
MiniMMAC
A small version of an MMAC. It has up to 13 ports, which may be AUI, thin, twisted pair, or fiber.
MINT
Millennium Infrastructure Network Technology
MJ
Major. One of several alarm severities that may be reported
by a "show alarm" command in an ADVA RayExpress device.
ML
Mesa Laboratory of NCAR, at 1850 Table Mesa Drive, Boulder, CO.
Multi Media Access Controller, a hub manufactured by Cabletron Systems. An MMAC-3 may have up to 49 ports. An MMAC-8 may have up to 169 ports. Any or all of the ports may be AUI, twisted pair, thinwire, fiber, token ring, FDDI, or LocalTalk.
MMC
Media Master Control; Microsoft Management Console
Metro Optical Ethernet, a service provided by Qwest, often called QMOE
MOP
Maintenance Operations Protocol. A Digital Equipment Corporation protocol used to boot DEC devices (VAXes, printers, DECservers, X-terminals) over the network.
MOPITT
Measurement Of Pollution In The Troposphere
MOU
Memorandum Of Understanding; Minutes of Use
MOU
Minutes of Use
MP-MLQ
MultiPulse-MultiLevel Quantization
MPLA
Multi-Lateral Peering Agreement, often used to define rules governing peers in an Internet exchange point like the RMIX (Rocky Mountain Internet Exchange)
MPLS
MultiProtocol Label Switching
MPPE
Microsoft Point-to-Point Encryption
MPPS
Million Packets Per Second
MR2000c
A repeater manufactured by Cabletron systems. It has one AUI port and one thinwire port.
MR5000
A repeater manufactured by Cabletron systems. It has one AUI port and four thinwire ports.
MR9000
A multi-port repeater manufactured by Cabletron systems. It has one AUI port and 8 thinwire ports.
A 10base-T (unshielded twisted pair) hub manufactured by Cabletron Systems. It has 12 ports, with provisions for 2 additional ports that may be other than 10base-T.
MS
MicroSoft
MSA
Master Services Agreement
MSC
Mesa State College, was a secondary FRGP member behind UCDHSC until May 2007, when they elected not to join the new UPoP.
MicroSoft Challenge-Handshake Authentication Protocol
MSDP
Multicast Source Discovery Protocol
MSDU
MAC Service Data Unit
MSFC
Multilayer Switch Feature Card (Cisco) a daughter card for Cisco Supervisor modules in Catalyst switches. The MSFC is a routing engine. In Sup 720s, the MSFC and PFC daughtercards are not optional.
MSM
Microwave Switching Matrix
MSM
Multilayer Switch Module (Cisco)
MSR
Main Seminar Room (at ML)
MSRC
Major Shared Resource Center
MSS
Mass Storage Systems group at NCAR.
MSS
Maximum Segment Size
MSSAC
Mass Storage System Advisory Committee
MSSG
Mass Storage Systems Group
MSU
Making Stuff Up
MSXML
MicroSoft XML
MT-800
A multi-port transceiver manufactured by Cabletron Systems. It has 9 ports, 8 or which are configured to look like a transceiver port. The 9th port connects to a transceiver. This device is basically the same as a DELNI.
MTBF
Mean Time Between Failures
MTP
Media Termination Point
MTTR
=Mean Time To Repair
MTU
Maximum Transmission Unit (also, Multiport Tranceiver Unit, like an MT-800). The largest possible unit of data that can be sent on a given physical medium. Example: The MTU of Ethernet is 1500 bytes. See fragmentation.
multi-homed host
A computer connected to more than one physical data link. The data links may or may not be attached to the same network.
multicast
A special form of broadcast where copies of the packet are delivered to only a subset of all possible destinations. See MBONE.
multiplex
The division of a single transmission medium into multiple logical channels supporting many simultaneous sessions. A way to support multiple connections on one line, often by giving the channel to each session for a short portion of time, then giving another session the channel, then another, etc.
