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4 Compaq StorageWorks 64-Bit PCI-To-Fibre Channel Host Bus Adapter User Guide
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
Lightwaves Electromagnetic waves in the region of optical frequencies. The time “ 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.
MIA Media Interface Adapter. This device allows a conversion from fiber optic
cable to copper media.
Micron (mm) Another term for micrometer. One millionth of a meter. 10
-6
meter.
Mode
A term used to describe a light path through a fiber, as in multi-mode or
single-mode.
Multi-initiators Two different fibre channel HBAs in one arbitrated loop sharing the same
storage devices, but not communicating with each other.
Multi-Mode Fiber
An optical waveguide in which light travels in multiple modes. Typical
core/cladding sized (measured in microns) are 50/125, 62.5/125, and
100/140.
Multiplexing The process by which two or more signals are transmitted over a single
communications channel.