| Term |
Description |
| MAC |
| MAC (Media Access Control) address is a unique number assigned to any Ethernet networking device by the manufacturer. The MAC address is permanent (unlike IP addresses) and therefore valuable identifier that allows a network to identify the hardware. |
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| MAE |
MAE (Metropolitan Area Exchange) is a major public network access point (NAP) for interconnecting traffic between ISPs. The terms MAE and NAP are often used interchangeably.
The term MAE is sometimes used to only identify the first NAPs set up by MFS Communications/MCI Worldcom:
MAE-East (Washington D.C.), MAE-Central (Dallas, TX), MAE-West (San Jose, CA), as well as the two MAE FE - Frame Encapsulation (FE), Packet over SONET (POS) services in Chicago and NY.
Basically, MAEs/NAPs are major interconnection points (and often the congestion points) that determine how/where traffic is routed in what is considered the Internet backbone. |
|
| MaxDupAcks |
| MaxDupAcks - Fast Retransmission and Fast Recovery of TCP connections that are encountering IP packet loss in the network. Allow a TCP sender to quickly infer a single packet loss by reception of duplicate acknowledgements for a previously sent and acknowledged TCP/IP packet. This mechanism is useful when the network is intermittently congested. The reception of 3 successive duplicate acknowledgements indicates to the TCP sender that it can resend the last unacknowledged TCP/IP packet (fast retransmit) and not go into TCP slow start due to a single packet loss (fast recovery). |
|
| Mbps |
Mbps (Megabits per second, not to be confused with MBps) stands for millions of bits per second or megabits per second and is a measure of bandwidth (the total information flow over a given time) on a communications medium.
A megabit is a million bits (binary pulses), or 1,000,000 (10^6) bits. Bits in data communications are discrete signal pulses and have historically been counted using the decimal number system. |
|
| MIB |
| MIB (Management Information Base) is a database containing ongoing information and statistics on each device in a network. It is used with SNMP to keep track of each device's performance and verify whether it's functioning properly. |
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| MIME |
| MIME (Multipurpose Internet Mail Extensions). MIME Extends the basic text-oriented Internet mail system in order that messages can contain binary attachments. |
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| MIMO |
MIMO (multiple input, multiple output) is an antenna technology for wireless communications in which multiple antennas are used simultaneously at both the source and the destination.
MIMO systems provide a significant capacity gain over conventional single antenna systems, along with more reliable communication. Many believe MIMO is the most promising of emerging wireless technologies.
MIMO is a key element of the 802.11n WiFi networking standard. |
|
| modulation |
| modulation is the process of imposing information on carrier signal by varying some parameter of the carrier. The parameters that can be varied are the amplitude, frequency or phase. |
|
| MPEG |
MPEG (Moving Pictures Experts Group) is a committee formed by the ISO to set standards for digital compression of full-motion video. Also stands for the digital compression standards created by this committee.
Below are some current standards for video/audio digital compression created by the comittee:
MPEG-1 - VHS quality, full-motion video (mp3 is derived from MPEG-1, audio layer-3)
MPEG-2 - broadcast quality, full-motion video (digital TV, DVD)
MPEG-3 - broadcast quality audio (High Definition TV, it has been merged with MPEG-2)
MPEG-4 - "speech and video synthesis, fractal geometry, computer visualization, and an artificial intelligence (AI) approach to reconstructing images..." |
|
| MRC |
| MRC (Monthly Recurring Charges). The MRC for a circuit includes recurring charges not associated with installation, primarily port and loop charges. |
|
| MS-DOS |
| MS-DOS (MicroSoft Disk Operating System) - A clone of CP/M for the 8088 crufted together in 6 weeks by hacker Tim Paterson at Seattle Computer Products, who called the original QDOS (Quick and Dirty Operating System) and is said to have regretted it ever since. Microsoft licensed QDOS in order to have something to demo for IBM on time, and the rest is history... |
|
| MSS |
| MSS (Maximum Segment Size) defines the largest segment of TCP (Transfer Control Protocol) data that the Winsock is prepared to receive. When a connection is established, the two ends agree to use the smaller of each end's value. Because headers are typically 40 bytes, MSS is usually 40 less than the MTU (Maximum Transmission Unit). |
|
| MTBF |
| MTBF (Mean Time Between Failure) A measure of the average time interval between a previous failure and the onset of the next failure of a device or network. |
|
| MTU |
| MTU (Maximum Transmission Unit) is the greatest amount of data that can be transferred in one physical frame on the network. If a packet that has a smaller MTU than the packet's frame length is sent, fragmentation will occur. For TCP (Transmission Control Protocol) MTU can range from 68 to 1500 bytes. Larger MTUs provide for lower overhead (fewer headers). |
|
| MTU Discovery |
MTU Discovery ( RFC1191 ) determines whether TCP uses a fixed, default maximum transmission unit (MTU) or attempts to find the actual MTU. If the value of this entry is 0, TCP uses an MTU of 576 bytes for all connections to computers outside of the local subnet. If the value of this entry is 1, TCP attempts to discover the MTU (largest packet size) over the path to a remote host.
Note: the setting under Windows NT 4 is EnablePMTUDiscovery. |
|
| multicast |
Multicast is a technique in which packets are simultaneously sent to multiple recipients on a network.
More specifically, multicast is a mechanism for defining groups of nodes, and sending IP messages to that group, rather than to every node on the LAN (broadcast), or just a single node (unicast).
It is often used to send an audio and/or video program to multiple users on a network more efficiently. The efficiency is realized by sending only one data stream from the file server, rather than one stream for each recipient. The digital data stream is duplicated as necessary in the downstream path by routers and/or switches in order to account for different signal paths to the end-users. |
|
| multihomed |
Multihomed is typically used to describe a device connected to two or more networks.
Essentially, Cable/DSL modems and NAT routers are multi-homed, because they have an external and an internal IP address on two separate networks, while switches, hubs, and network adapters are not. If a machine has multiple NICs, but is only attached to one network, it is not considered multihomed. |
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| Multiplexer |
| Multiplexer is a device that allows the transmission of multiple data streams over a common medium. Several communications paths or channels may be either permanently or dynamically established over the medium to accomplish this. |
|
| multiplexing |
| The transmission of more than one independent signal over a single transmission media. The transmitted signals need not operate continuously or simultaneously in order for multiplexing to have occurred. |
|
| MVNO |
| MVNO (Mobile Virtual Network Operator) is a mobile operator that does not own its own spectrum and usually does not have its own network infrastructure. Instead, MVNO's have business arrangements with traditional mobile operators to provide the actual services. MVNO's typically add value such as brand appeal, distribution channels, and other affinities to the resale of mobile services. |
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| Term |
Description |
Glossary