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Peripheral Component Interconnect. A high performance local bus specification that allows
PCI Express*
connection of devices directly to computer memory. The PCI Local Bus allows transparent
upgrades from 32-bit data path at 33 MHz to 64-bit data path at 33 MHz, and from 32-bit
data path at 66 MHz to 64-bit data path at 66 MHz.
A piece of hardware (such as a video monitor, disk drive, printer, or
Peripheral
Devices
CD-ROM) used with a computer and under the computer's control. SCSI peripherals are
controlled through a SCSI RAID controller (host controller).
SCSI Bus
A RAID controller (host controller) and one or more SCSI peripherals connected by cables
in a linear configuration. The controller may exist anywhere on the bus, allowing connection
of both internal and external SCSI devices. A system may have more than one SCSI bus by
using a multi-channel controller or by using multiple controllers.
SCSI Device
Any device that conforms to the SCSI standard and is attached to the SCSI bus by a SCSI
cable. This includes SCSI RAID controllers (host controllers) and SCSI peripherals.
SCSI ID
A way to uniquely identify each SCSI device on the SCSI bus. Each SCSI bus has eight
available SCSI IDs numbered 0 through 7 (or 0 through 15 for Wide SCSI). The RAID
controller (host controller) usually gets the highest ID (7 or 15) giving it priority to control
the bus.
Single-Ended
A hardware specification for connecting SCSI devices. It references each SCSI signal to a
SCSI
common ground. This is the most common method (as opposed to differential SCSI, which
uses a separate ground for each signal).
A technology developed and used by Intel to improve data integrity, data transfer rates, and
TolerANT
noise immunity through the use of active negation and input signal filtering.
A standard for SCSI data transfers. It allows a transfer rate of up to
Ultra SCSI
20 Mbytes/s over an 8-bit SCSI bus and up to 40 Mbytes/s over a 16-bit SCSI bus.
A standard for SCSI data transfers. It allows a transfer rate of up to
Ultra2 SCSI
40 Mbytes/s over an 8-bit SCSI bus, and up to 80 Mbytes/s over a
16-bit SCSI bus.
A standard for SCSI data transfers. It allows a transfer rate of up to 160 Mbytes/s over a 16-
Ultra160 SCSI
bit SCSI bus.
A standard for SCSI data transfers. It allows a transfer rate of up to 320 Mbytes/s over a 16-
Ultra320 SCSI
bit SCSI bus.
Very High-Density Cable Interconnect. This cable is used to connect external connectors to
VHDCI
your RAID controller.
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