SCSI Small computer system interface.
segment
A part.
sel Select.
serialize
To change from parallel-by-byte to
serial-by-bit.
serializer
A device that converts a space
distribution of simultaneous states that
represents data into a corresponding time
sequence of states.
servo, servos
An adjective for use in qualifying some
part or aspect of a servomechanism.
servomechanism
A feedback control system in which at
least one of the system signals represents
mechanical motion.
Small Computer Systems Interface (SCSI)
A standard that is used by computer
manufacturers for attaching peripheral
devices (such as tape drives, hard disks,
CD-ROM players, printers, and scanners)
to computers (servers). Pronounced
“scuzzy”. Variations of the SCSI interface
provide for faster data transmission rates
than standard serial and parallel ports (up
to 160 megabytes per second). The
variations include
v Fast/Wide SCSI: Uses a 16-bit bus, and
supports data rates of up to 20 MBps.
v SCSI-1: Uses an 8-bit bus, and supports
data rates of 4 MBps.
v SCSI-2: Same as SCSI-1, but uses a
50-pin connector instead of a 25-pin
connector, and supports multiple
devices.
v Ultra SCSI: Uses an 8- or 16-bit bus,
and supports data rates of 20 or 40
MBps.
v Ultra2 SCSI: Uses an 8- or 16-bit bus
and supports data rates of 40 or 80
MBps.
v Ultra3 SCSI: Uses a 16-bit bus and
supports data rates of 80 or 160 MBps.
v Ultra160 SCSI: Uses a 16-bit bus and
supports data rates of 80 or 160 MBps.
SNS Sense.
special feature
A feature that can be ordered to enhance
the capability, storage capacity, or
performance of a product, but is not
essential for its basic work.
SR Service representative, see also CE.
SRAM
Static random access memory.
SS Status store.
ST Store.
standard feature
The significant design elements of a
product that are included as part of the
fundamental product.
START
Start maintenance.
subsystem
A secondary or subordinate system,
capable of operating independently of, or
asynchronously with, a controlling
system.
SUPP Support.
sync Synchronous, synchronize. Occurring with
a regular or predictable time relationship.
T
tachometer, tach
A device that emits pulses that are used
to measure/check speed or distance.
tape cartridge
A container-holding magnetic tape that
can be processed without separating it
from the container.
tape void
An area in the tape in which no signal
can be detected.
TCP/IP
Transmission Control Protocol/Internet
Protocol.
TCU Tape control unit.
TH Thermal.
thread/load operation
A procedure that places tape along the
tape path.
TM Tapemark.
Glossary 113
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