HP AB232A Przewodnik Instalacji Pobierz pdf (Strona 42)

Glossary

42 FCA2384 PCI-X Host Bus Adapter for OpenVMS and Tru64 UNIX Installation Guide

Laser

Light Amplification by Stimulated Emission of Radiation. A device that produces

coherent light with a narrow range of wavelengths.

Latency

Delay in transmission; can be caused by arbitration time prior to winning control

of the network.

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.

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HP AB232A Przewodnik Instalacji Strona 42