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Encoding A digital scheme used in Ethernet networks to encode
data and timing signals in the same transmitted data stream.
Manchester encoding uses a mid-bit-time transition for clocking,
and a 1 denotes a high-level during the first half of the
Automation Protocol (MAP) A specification outlining the automation
of tasks in a computer-integrated manufacturing or factory
environment. MAP was originally formulated by General Motors
to assist in procurement.
Message Service (MMS) A service used in automated production
lines, enabling a computer application on a control machine
to communicate with an application on a slave machine.
Conversation A conversation occurring between two transaction
programs that are using the Advanced Program-to-Program Communication
(APPC) Application Program Interface (API).
Tag A formatting or inclusion tag in an editing program that
serves as an instruction to a processing or reading program.
A markup tag is not visible until the file is passed through
an appropriate program. A familiar use of markup tags occurs
in the Hypertext Markup Language (HTML) used to create Web
pages, where tags represent document layout instructions and
links to other places in a file. Markup tags are placed within
angle brackets (< >).
Unit (MRU) An option in the Link Control Protocol (LCP). The
MRU enables a sender to inform a peer that the sender can
receive larger frames than specified in the default or to
request that the peer send smaller frames.
Time Between Failures (MTBF) A statistically derived average
length of time (expressed in thousands or tens of thousands
of hours), a computer system or component operates before
Time To Repair (MTTR) A statistically derived average length
of time, it takes to repair a failing computer system or component.
Media The plural of medium, a term describing the physical
paths over which communications flow (for example, copper
wires, coaxial cables, or fiber-optic cables).
Access Control (MAC) One of two sublayers of the Data-Link
Layer (layer 2 of the OSI Reference Model) that controls the
use of network hardware and governs access to transmission
media. This sublayer is defined in the Institute of Electronic
and Electrical Engineers (IEEE) 802.x set of Local Area Network
(LAN) standards. The other sublayer in the Data-Link Layer
is the Logical Link Control (LLC) sublayer.
Method A strategy on the Data-Link Layer (Layer 2) of the
OSI Reference Model that network nodes use to access a network
transmission medium. A common media-access method is Carrier
Sense Multiple Access/Collision Detection (CSMA/CD).
Manager (MM) A NetWare database that tracks all peripheral
storage devices and media attached to NetWare servers and
enables applications to access or gain information from the
devices and media. This database receives input/output requests
from applications and converts them to messages compatible
with the NetWare Peripheral Architecture (NPA).
ID Identification information attached to electronic media
to help identify their contents. The media-set ID is commonly
used for back-up tape cartridges.
Unit (MAU) A device that detects collisions and injects bits
onto the network. The MAU works on the Physical Layer (Layer
1) of the OSI Reference Model and complies with the Institute
of Electronic and Electrical Engineers (IEEE) 802.3
Unit (MMU) The part of a computer microprocessor responsible
for managing the mapping of virtual memory addresses to actual
physical addresses. The MMU can be a separate chip (as was
the case in early Intel or Motorola microprocessors) or part
of the central processing unit (CPU) chip. NM