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Communications - Glossary

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Glossary of Electrical Terms M-O

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MTTR -

Mean time to recovery. The average amount of time a device will spend in corrective maintenance over a given period of time.
Mean time to repair. The average amount of time needed to repair a failed unit.

MUX - Multiplex or Multiplexer. A device that performs multiplexing.
Mbps - A measurement of the speed of digital communications channel; one million bits per second.
Megabit (Mb) - One million bits.
Megabyte (MB) - One million bytes.
Microbending Loss - In fiber optics, the loss of light attributed to large bends in a fiber.
Micron - A unit of measurement, equaling one-millionth of a meter. A human hair is about 1000 microns thick; today's transistors measure .09 micron wide and getting smaller.
Multimode Fiber - A fiber whose core diameter is large compared with the wavelength of light and therefore propagates more than one mode.
Multiplex - To transmit multiple signals over a single communications line or computer channel by interleaving the messages.
Multiplexer - At one end of a communications link, a device that combines several lower-speed transmission channels into a single high-speed channel. A multiplexer at the other end reverses the process. A multiplexer is sometimes called a mux.
Multiplexer/Demultiplexer - A multiplexer transmits multiple separate signals over a single communications line or computer channel by interleaving the signals. A demultiplexer converts a transmission that contains multiple intermixed signals back into the original separate signals.
Multiplexing - The process of combining a number of individual channels into a common frequency band or into a common bit stream for transmission. The converse equipment or process for separating a multiplexed stream into individual channels is called a de-multiplexer.

NTSC - National Television Systems Committee. Sets television standards in the United States. Also the video format used in the United States.
Narrowband - In communications technology, digital communication at the rate of 64,000 bits per second or lower.
Network - I A collection of computers, terminals, and other devices and the hardware and software that enable them to exchange data resources.
Network Element - A piece of equipment in a telecommunications network, such as cross-connects, multiplexers, and transmission gear.

Optical Carrier (OC) - A hierarchy of optical signals used to classify speeds, or capacities, of fiber lines, especially as related to the SONET standard. The basic speed is OC-1 (52 Mb/second). An OC-48 fiber line has a capacity of 2.5 gigabits a second and an OC-192 line 10 gigabits a second.
Optical Fiber - Long strands of glass, thinner than a human hair, which propagate a lightwave signal for use in broadband communications. Synonym for fiber, lightguide.
Optical Network - A network that carries digitized voice or data at very high rates on multiple channels of light.
Optical Loss - The amount of a signal's power lost, expressed in dB. This is due to a fibers length, amount of splices, bend radius or any mechanical external factors placed on the fiber.
Optical Output - The optical output power of a laser or optical transmitter.
Optical Reflections - The optical power (expressed in dB) reflected by a component or an assembly.
Optical Return Loss - The ratio (expressed in dB) of optical power reflected by a component or an assembly to the optical power incident on a component port when that component or assembly is introduced into a link or system.

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