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Glossary
T
tape See magnetic tape.
tape drive A device for moving magnetic
tape and controlling its movement. (T) It is
also called a tape transport.
target A SCSI device performing an I/O
operation requested by the initiator.
transmitter/receiver subassembly (TRS)
In an ESCON environment, the electronic
component that contains an optical
transmitter and an optical receiver. (IBM)
transport An electro-mechanical device
capable of threading tape from a cartridge,
moving the tape across a read/write head,
and writing data onto or reading data from
the tape.
TRS See transmitter/receiver subassembly.
V
vary offline To change the status of a
device from online to offline. When a device
Glossary-6
is offline, no data set may be opened on that
device. (IBM)
vary online To restore a device to a state
where it is available for use by the system.
(IBM)
VOLSER See volume serial number.
volume serial number A six-character
alphanumeric label used to identify a
volume.
W
Windows NT Microsoft's operating system
that is used on a variety of computers and
workstations.
write operation An output operation that
sends a processed record to an output device
or output file. (IBM)
write protection Restriction of writing into
a data set, file or storage area of a user or
program not authorized to do so. (IBM)
Ninth Edition
95739
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