Scalar i500 User’s Guide 547
Glossary
1U, 2U, 3U, etc. Racks manufactured for mounting computer hardware
often define vertical space as “units.” The components that are mounted
in the racks are defined by how many units of rack space they require.
For example, the height of a unit in a rack is 1.75 inches. If a component is
5.25 inches in thickness, the component is said to be a 3U component.
A
Arbitrated loop
A Fibre Channel configuration that attaches multiple
communicating ports in a loop. Two or more ports can interconnect, but
only two ports can communicate simultaneously.
Arbitration The submission of a request to gain access to an arbitrated
loop by a device, so that it can transmit data in the loop.
Availability A RAS attribute that refers to the accessibility of a system
resource in a timely manner; for example, the measurement of a system’s
uptime.
B
Barcode
A printed array of varied rectangular bars and spaces that can
be scanned and read for object identification.
Bus A transmission channel through which electrical signals are carried
from one device to another device.
C
CAN (Controller Area Network)
A serial bus network of microcontrollers
that connects devices, sensors and actuators in a system or sub-system for
real-time control applications. There is no addressing scheme used in
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