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differential operation A SCSI bus alternative in
which the signal from the SCSI chip passes
through a set of differential drivers and receivers.
This alternative provides better signal quality with
less cross-talk and noise but requires more power
to drive the signal. Contrast with single-ended
operation.
Digital Linear Tape (DLT) (1) A trademarked
name for Quantum cartridge tapes and drives. (2)
A type of magnetic tape storage device marketed
by several companies. DLT cartridges are ½-inch
wide and come in several sizes ranging from 20 to
over 80 GB.
dismount To remove a cartridge from a drive.
DLT See Digital Linear Tape.
DLT1 A low cost, high-capacity tape drive
manufactured by Benchmark Storage Innovations
and Quantum Corporation. It features a native
capacity of 40 GB using DLTtape IV media with a
sustained transfer rate up to 3 MB/s.
domain (1) A shared user authorization database
which contains users, groups, and their security
policies. (2) A set of interconnected network
elements and addresses that are administered
together and that may communicate.
Domain Name Service (DNS) A service that
translates domain names into IP addresses.
Because domain names are alphabetic, they are
easier to remember than IP addresses. See library
name.
door interlock switch A switch that disconnects
power to the library when the front door is
opened.
drive An electromechanical device that moves
magnetic tape and includes the mechanisms for
writing and reading data to and from the tape.
Dynamic Host Configuration Protocol
(DHCP) (1) Server software that automatically
sets the library IP address, subnet mask, and name.
(2) Server software that automatically sets IP
address, net mask, and gateway. (IBM)
MT9104
E
electronics module A unit in the library
consisting primarily of the internal LLC card,
interface connections, and the personality module
on the EM frame.
electrostatic discharge (ESD) An undesirable
discharge of an accumulated electrical charge
(static) that can severely damage delicate
components and degrade electrical circuitry.
element An externally addressable component of
a library, such as a drive, CAP, or storage cell.
enabled (1) Active. (2) On.
ESD See electrostatic discharge.
Ethernet A 10 Mb/s baseband local area network
that allows multiple stations to access the
transmission medium at will without prior
coordination, avoids contention by using carrier
sense and deference, and resolves contention by
using collision detection and transmission.
Ethernet uses carrier sense multiple access with
collision detection. (IBM)
Ethernet address A six-byte address that makes
a library accessible to a network. See also Ethernet,
Internet Protocol (IP) address, library name, and
subnet mask.
Event log A file, accessible through the operator
panel, that contains events that occurred during
the functional operation of the library.
F
F Fahrenheit.
fast load A mode of library operation permitting
the robot to retrieve another cartridge before
receiving load confirmation from a drive.
fault symptom code (FSC) A four-character
hexadecimal code generated in response to an
error to help isolate failures within the device.
FRU See field replaceable unit.
Seventh Edition
Glossary
Glossary-3
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