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Glossary 5
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
nm
Nanometer. A unit of measurement equal to one billionth of a meter. 10exp-
9 meter.
Non-OFC Non-Open Fiber Control. GLMs that do not contain OFC control but still
guarantee laser emission levels to be below Class 1.
OFC Open Fiber Control. A power monitoring/control system which
continuously monitors the optical fiber link between two ports and prevents
any laser emission from exceeding Class 1 levels in the event of a break
anywhere in the path.
Optical Waveguide
Dielectric waveguide with a core consisting of optically transparent material
or low attenuation (usually silica glass) and with cladding consisting of
optically transparent material of lower refractive index than that of the core.
It is used for the transmission of signals with lightwaves and is frequently
referred to as fiber.
PCI Bus #
An internal Peripheral Connect Interface bus number in a computer. BCI
Bus # is set by the computer system’s BIOS, and in most cases, the number
is zero.
PCI Device # PCI slot number in a computer.
Point-To-Point (PTP)
A connection established between two specific locations, as between two
buildings.
Protocol A data transmission convention encompassing timing, control, formatting,
and data representation.
SCSI
Small Computer Systems Interface.
SelectID
Used to configure Seagate drives. A matrix for relating ALPA (hex)
numbers to SelectID (hex) numbers.
Shortwave Refers to length of the wave or frequency in the spectrum of light. 780 nm
is the operating range of short wave lasers, while 1300nm describes the
range of long wave lasers.
Simplex Cable A term sometimes used for a single-fiber cable.
Simplex Transmission Transmission in one direction only.