IBM T400 Setup, Operation, And Service Manual Download

Page: 126 / 136

another. A typical switch can facilitate several
simultaneous bandwidth transmissions between different
pairs of nodes.

TapeAlert.

A patented technology and ANSI standard

that defines conditions and problems that are
experienced by tape drives.

TapeAlert flags.

Status and error messages that are

generated by the TapeAlert utility and display on the
server’s console.

tape cartridge.

A removable storage case that houses

belt-driven magnetic tape that is wound on a supply reel
and a takeup reel.

tape drive.

See

IBM TotalStorage LTO Ultrium 2 Tape

Drive

tape path.

Within a tape drive, the channel in which

the media moves.

tapeutil.

Created by IBM, a utility program for LTO

devices that connect to all supported servers except
Windows NT and Windows 2000.

tapeutil

provides

service aids for tape subsystems, offers a menu-driven
tool for exercising or testing IBM tape and medium
changer devices, and includes a command-line interface
that is convenient for use in shell scripts.

terminate.

To prevent unwanted electrical signal

reflections by applying a device (known as a terminator)
that absorbs the energy from the transmission line.

terminator.

(1) A part that is used to end a SCSI bus.

(2) A single-port, 75-

device that is used to absorb

energy from a transmission line. Terminators prevent
energy from reflecting back into a cable plant by
absorbing the radio frequency signals. A terminator is
usually shielded, which prevents unwanted signals from
entering or valid signals from leaving the cable system.

TERMPOWER.

Electrical power that is provided by a

device (such as the Ultrium 2 Tape Drive) to a SCSI
terminator so that the SCSI bus can function. To supply
TERMPOWER, a jumper must be placed on pin 1 of the
SCSI ID connector on the Ultrium 2 Tape Drive.

Test Head diagnostic.

A test that determines whether

the heads of the Ultrium 2 Tape Drive are operating
properly and whether the drive can correctly read from
and write to tape.

throughput.

A measure of the amount of information

that is transmitted over a network in a given period of
time.

topology.

In communications, the physical or logical

arrangement of nodes in a network, especially the
relationships among nodes and the links between them.

TotalStorage LTO Ultrium 2 Tape Drive.

See

IBM

TotalStorage LTO Ultrium 2 Tape Drive

track.

A linear or angled pattern of data that is written

on a tape surface.

transfer rate.

See

data transfer rate

two-node arbitrated loop.

In Fibre Channel

technology, the connection of two nodes that
communicate directly (without the use of a switch) and
use the same protocol.

two-node switched fabric loop.

In Fibre Channel

technology, the connection of two or more nodes that
communicate by using a switch. The nodes may not use
the same protocol.

Ultra160 LVD SCSI interface.

See

Small Computer

Systems Interface

Ultrium 2 Tape Drive.

See

IBM TotalStorage LTO

Ultrium 2 Tape Drive

uniform resource locator (URL).

The address of an

item on the World Wide Web. It includes the protocol
followed by the fully qualified domain name (sometimes
called the host name) and the request. The web server
typically maps the request portion of the URL to a path
and file name. For example, if the URL is

http://www.networking.ibm.com/nsg/nsgmain.htm

, the

protocol is

http

; the fully qualified domain name is

www.networking.ibm.com

; and the request is

/nsg/nsgmain.htm

unload.

The act (performed by the drive) of

unthreading tape from the drive’s internal tape path and
returning it (with the leader block) to the tape cartridge.

unload button.

Located at the front of the Ultrium 2

Tape Drive, a push button that, when depressed,
rewinds the tape in a cartridge and ejects the cartridge
from the drive. The unload button can also be used to
place the tape drive in maintenance mode, scroll
through maintenance functions, exit maintenance mode,
force a drive dump, and reset the drive.

URL.

See

uniform resource locator

utility.

See

utility program

utility program.

A computer program that supports

computer processes. For example, a diagnostic
program, a trace program, or a sort program.

Vdc.

Volts dc (direct current).

114