Data Center Industry Terms
M
- MAC Address
- Media Access Control address. Unique hardware serial number that uniquely identifies a device on a local area network (commonly a NIC) (Sometimes also referred to as a NIC's "physical address".)
A MAC address is 6 bytes in length (i.e. 48 bits) and is normally written as a 12 digit hexadecimal number, with dashes or colons between each pair of hexadecimal digits. The first three bytes identifies the manufacturer and the second three bytes represent a unique serial number generated by that manufacturer. MAC addresses should therefore always be unique (although some cards and switches allow the MAC address to be cloned).
- Main Gas Line
- The primary gas distribution piping serving a building
- Main Incoming Electrical Feeder
- The primary electrical service to a building from the utility
company
- Make up air
- Outside air introduced into the IT room or data center. Make-up air is mandated by building codes primarily to ensure the space is fit for human occupancy.
- MAPI
- Messaging Application Programming Interface. A common interface standard (originally specified by Microsoft) enabling applications to interface to messaging systems.
- MB
- Mega-byte. In computing this is generally taken as 1,048,576 bytes (1024 x 1024). Storage devices usually define this as 1,000,000 bytes.
- mbps
- Mega-bits per second. Strictly 1mbps = 128KB per second, but when measuring network/modem throughput a figure of 1mbps = 100 KB per second is probably closer to the real throughput after other networking overheads are taken into consideration.
- MBR
- Master Boot Record.
- MCSE
- Microsoft certified systems engineer.
- MDI
- 1. Multiple Document Interface. A GUI interface for a tool allowing more than one document to be visible at a time. 2. Medium Dependent Interface. Provides the physical connection to a cable.
- MDI/MDI-X
- Network hub crossover switch. An MDI/MDI-X switch on a network hub typically allows a port on a network hub to connect to either a network peripheral (such as a pc) or another hub/switch.
- MDIX (or MDI-X)
- A cross over version of MDI. MDI ports connect to MDIX ports via a straight through cable, both MDI-to-MDI and MDIX-to-MDIX connections use crossover cables.
- Megawatt (mw)
- This is a unit of electricity production or demand. A typical fossil fuel power plant can produce 500 to 1,000MW’s.
- Megohmmeter
- A testing device that applies a DC voltage and measures the resistance (in millions of ohms) offered by conductor's or equipment insulation.
- MEP Systems
- Mechanical, Electrical and Plumbing Systems
- MFC
- Microsoft Foundation Class Library. Provides a framework on which applications can be developed for MS-Windows.
- MHP
- Multimedia Home Platform.
- Micron
- One millionth of a meter.
- Microprocessor Controller
- A computer logic based system found in precision cooling systems that monitors, controls and reports data on temperature, humidity, component performance, maintenance requirements and component failure.
- MIDAS
- Middle-tier Distributed Application Services. Borland physical multitier architecture used in Delphi. Renamed as DataSnap in Delphi 6.
- MII
- 1. Media Independent Interface.
2. Microsoft/Intel/IBM.
- MMC
- Microsoft Management Console.
- MME
- Microsoft Mobile Explorer. Mobile phone/WAP emulator, allowing you to see what a web site would look like on a WAP capable phone.
- MMI
- Man Machine Interface. Same as HMI but an older term and generally regarded as being less politically correct than HMI.
- Modem
- Short for Modulator/Demodulator. A modem allows allows data to be transmitted over an analog stream (typically a phone line) to another modem where the data is reconstituted.
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