HP StorageWorks A7298A Installation Manual page 86

Glossary
Light
In the laser and optical communication fields, the portion of the electromagnetic spectrum that
can be handled by the basic optical techniques used for the visible spectrum extending from the
near ultraviolet region of approximately 0.3 micron, through the visible region, and into the
mid-infrared region of about 30 microns.
Light Emitting Diode (LED)
A device used in a transmitter to convert information from electrical to optical form. It typically
has a large spectral width.
Lightwaves
Electromagnetic waves in the region of optical frequencies. The term "light" was originally
restricted to radiation visible to the human eye, with wavelengths between 400 and 700
nanometers (nm). However, it has become customary to refer to radiation in the spectral regions
adjacent to visible light (in the near infrared from 700 to about 2000 nm) as "light" to
emphasize the physical and technical characteristics.
Link
A fiber optic cable with connectors attached to a transmitter (source) and receiver (detector).
Longwave
Refers to length of the wave or frequency in the spectrum of light. 780 nm is the operating range
of short wave lasers, while 1300 nm describes the range of long wave lasers.
LUN
Logical Unit Number. A three-bit identifier for a Logical Unit. The maximum number of LUNs
per SCSI target is 8, numbered LUN0 through LUN7.
Mb/s
Megabits per second or 1,000 bits per second. A reference to processing speed.
MB/s
Megabytes per second or 1,000 bytes per second. A reference to processing speed.
Media Manager (MM)
A database built into NetWare that keeps track of all peripheral storage devices and media
attached to NetWare servers, and allows applications to gain access and get information. The
Media Manager receives application I/O requests and converts them to messages compatible
with the NPA architecture.
Micron (mm)
Another term for micrometer. One millionth of a meter. 10
Mode
A term used to describe a light path through a fiber, as in multi-mode or single-mode.
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meter.
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