IBM TS3100 Setup, Operator, And Service Manual page 364

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
J-4
TS3100 Tape Library and TS3200 Tape Library Setup, Operator, and Service Guide
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 Ultrium Tape Drive. Located within the library,
a data-storage device that controls the movement of the
magnetic tape in an IBM LTO Ultrium 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 . See Internet Key Exchange (IKE).
IML. Initial microprogram load.
Incomp. Mag.. Incompatible Magazine: This message
appears on the Operator Control Panel during library
initializing. It occurs during factory restore or VPD.
This is not a real issue since it takes the library a while
to configure.
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.
Internet Key Exchange (IKE). The protocol used to set
up a security association (SA) in the IPsec protocol
suite. See also Security Association (SA).
interposer. The part used to convert a 68-pin
connector to a 50-pin D-shell connector.