IBM L5U, Maintenance Information

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D-4
TS3400 Tape Library Maintenance Information
file transfer protocol (FTP) . In the Internet suite of
protocols, an application layer protocol that uses TCP
and Telnet services to transfer bulk-data files between
machines or hosts.
firmware . Proprietary code that is usually delivered as
microcode as part of an operating system. Firmware is
more efficient than software loaded from an alterable
medium and more adaptable to change than pure
hardware circuitry. An example of firmware is the Basic
Input/Output System (BIOS) in read-only memory
(ROM) on a PC motherboard.
FLASH EEPROM . An electrically erasable
programmable read-only memory (EEPROM) that can
be updated.
FMR . Field microcode replacement.
format . The arrangement or layout of data on a data
medium.
formatter . Part of a magnetic tape subsystem that
performs data conversion, speed matching, encoding,
first level error recovery, and interfaces to one or more
tape drives.
FP . File protect.
frayed . Damaged as if by an abrasive substance.
FRU . Field replaceable unit.
FSC . Fault symptom code.
FSI . Fault symptom index.
functional microcode . Microcode that is resident in the
machine during normal customer operation.
G
g . Gram.
GB . gigabyte.
GBIC . Gigabit Interface Converter.
Gbi . gigabit
gigabit (Gbit) . 1 000 000 000 bits.
gigabyte (GB) . 1 000 000 000 bytes.
Gigabit Interface Converter (GBIC) . Converts copper
interface to optic interface.
gnd . Ground.
H
hertz (Hz) . Unit of frequency. One hertz equals one
cycle per second.
hex . Hexadecimal.
High Voltage Differential (HVD) . A logic signaling
system that enables data communication between a
supported host and the library. HVD signaling uses a
paired plus and minus signal level to reduce the effects
of noise on the SCSI bus. Any noise injected into the
signal is present in both a plus and minus state, and is
thereby canceled. Synonymous with
differential .
HVD . SCSI Bus High Voltage Differential
Hz . Hertz (cycles per second).
I
IBM TotalStorage System Storage Tape Drive .
Located within the library, a data-storage device that
controls the movement of the magnetic tape in an IBM
TotalStorage System Storage Tape Cartridge. The drive
houses the mechanism (drive head) that reads and
writes data to the tape.
ID . Identifier.
identifier (ID) . (1) In programming languages, a
lexical unit that names a language object; for example,
the names of variables, arrays, records, labels, or
procedures. An identifier usually consists of a letter
optionally followed by letters, digits, or other characters.
(2) One or more characters used to identify or name data
element and possibly to indicate certain properties of
that data element. (3) A sequence of bits or characters
that identifies a program, device, or system to another
program, device, or system.
IKE . Internet Key Exchange used in the IPsec protocol.
IML . Initial microprogram load.
initial microprogram load (IML) . The action of
loading a microprogram from an external storage to
writable control storage.
initiator . The component that executes a command.
The initiator can be the host system or the tape control
unit.
INST . Installation.
interface . A shared boundary. An interface might be a
hardware component to link two devices or it might be a
portion of storage or registers accessed by two or more
computer programs.