HP StorageWorks Modular Arrays - Manual (Page 87)

Glossary 3
Compaq Confidential – Need to Know Required
Writer: Bill Reitz Project: Compaq StorageWorks 64-Bit PCI-To-Fibre Channel Host Bus Adapter User Guide Comments:
Part Number: AA-RKPDA-TE 173941-001 File Name: J-GLOS GLOSSARY.DOC Last Saved On: 12/6/99 10:34 AM
Fiber Thin filament of glass. An optical waveguide consisting of a core and
cladding, which is capable of carrying information in the form of light.
Fibre is also a general term used to cover all physical media types supported
by Fibre Channel, such as optical fiber, twisted pair, and coaxial cable.
Fiber Optics Light transmission through optical fibers for communication or signaling.
Fibre Channel A high-speed, serial, bi-directional, topology independent, multi-protocol,
highly scaleable interconnection between computers, peripherals, and
networks.
GLM Gigabit Link Module. A transmitter and receiver that provides high-speed
serial links, enabling continuous throughput in each direction
simultaneously.
Host Adapter Module (HAM) A HAM is the driver component used to drive specific HBA hardware in the
NetWare Peripheral Architecture (NPA).
Interrupt Request (IRQ) Network boards are supplied with default settings for the IRQ, I/O port and
base memory address. An IRQ is a signal protocol used by hardware
devices, such as printers and modems, to let the computer know that they
need some attention. When an IRQ is invoked, the CPU puts its other work
“on hold” and services the needs of the interrupting device.
Kilometer 1,000 meters or 3,281 feet. The kilometer is a unit of measurement
commonly used in fiber optics. To convert kilometers to miles, multiply the
number of kilometers by .62 to achieve the number of miles. To convert
miles to kilometers, multiply the number of miles by 1.61 to achieve the
number in kilometers.
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 form 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.