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Interface
& Connector
Reference
SCSI
Connectors
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Storage Dictionary
- SAF-TE
- SCSI
Accessed Fault Tolerant Enclosures. The SAF-TE specification
is independent of hardware I/O cabling, operating systems,
server platforms, and RAID implementation because the enclosure
itself is treated as simply another device on the SCSI bus.
- SAN
- Storage
Area Network. Also referred to as STAN, to differentiate
it from System Storage Area Network. Browse to SAN
for more information.
- SAS
- Server
Attached Storage
Serial Attached SCSI
- SASI
- Shugart
Associates Standard Interface. Designed by Shugart Associates
in 1980, it was the predecessor of SCSI.
- SASI
- Shugart
Associates Standard Interface. Designed by Shugart Associates
in 1980, it was the predecessor of SCSI.
- S-ATA
- Serial AT Attachment
- Serial
ATA is a high-speed serial link replacement for the parallel
ATA attachment of mass storage devices. The serial link
employed is a high-speed differential layer that utilizes
Gigabit technology and 8b/10b encoding. The advantages of
S-ATA over parallel ATA include better performance (>150MB/s),
cable length (1 meter), cable management (7 pin data cable)
and low power consumption.
- SCAM
- SCSI
Configured AutoMatically, a function in the SCSI-3 parallel
standard that enables assignment of SCSI IDs to individual
devices automatically, under software control.
- scanner
- A
device that optically senses a human-readable image and
contains software to convert the image to machine-readable
code.
- SCSI
- Small
Computer System Interface. Pronounced "skuzzy". An industry
standard for connecting peripheral devices and their controllers
to a microprocessor. The SCSI defines both hardware and
software standards for communication between a host computer
and a peripheral. Computers and peripheral devices designed
to meet SCSI specifications should work together. It can
be either SCSI-1, SCSI-2, or SCSI-3.
- SCSI-1
- The
first version defined by ANSI-X3.131-1986. SCSI-1 is largely
a subset of SCSI-2.
- SCSI-2
- Successor
to SCSI-1. It is defined by ANSI-X3.131-1992. SCSI-2 is
upward compatible from SCSI-1.
- SCSI-3
- Successor
to SCSI-2. SCSI-3 differs from SCSI-1 and SCSI-2 in being
designed primarily for communication over a serial media
(fiber, copper,) using a packetized protocol.
- SCSI
address
- Also
called SCSI ID, an octal representation of the unique address
assigned to a SCSI device.
- SCSI
ID
- See
SCSI address.
- sector
- Also
called a block. The smallest addressable unit of the track
of a magnetic, optical, or other disc. Often contains 512
bytes.
- serial
interface
- Data
communications mode in which bits are sent in sequence.
Contrast with parallel interface.
- serialization
- A
process of sending transmission characters one bit at a
time by serial transmission.
- shielding
- Protective
covering that eliminates electromagnetic and radio frequency
interference.
- signal
assertion
- The
act of driving a signal to the TRUE state.
- signal
negation
- Act
of driving a signal to the FALSE state (active negation),
or placing the driver in the high impedance condition, and
allowing the cable terminators to bias the signal to the
FALSE state.
- signal
release
- Act
of allowing the cable terminators to bias the signal to
the FALSE state by placing the driver in the high impedance
condition.
- single-ended
interface
- An
electrical signal configuration using a single line for
each signal, referenced to a ground path common the other
signal lines. The advantage of single-ended configuration,
compared to differential, is in using half the number of
pins, chips, and PC board area. Its disadvantage is higher
vulnerability to common mode noise, and limited cable distance,
up to 6 meters.
- single-mode
fiber
- A
step index fiber waveguide in which only one mode (ray of
light) will propagate.
- skew
- To
slant a selected item or delay a certain signal in any direction
relative to another reference item signal.
- SNMP
- Simple
Network Management Protocol.
- solenoid
- A
magnetic switch that closes a circuit.
- source
address
- A
field in a frame header that identifies its sender.
- status
- In
SCSI, one byte of information sent from a target to an initiator
upon completion of each command, indicating the failure
mode, if any, of the command.
- SOF
- Start-of-frame
delimiter. A delimiter used to mark the beginning of a frame.
- switch
- The
name of an implementation of the fabric topology.
- synchronous
transmission
- Transmission
in which the sending and receiving devices operate continuously
at the same frequency, and are held in a desired phase relationship
by a correction device. For buses, synchronous transmission
is a timing protocol that uses a master clock with a clock
period and an allowable offset.
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