Specifications

GL–20 Glossary
SCSI device ID
number
A bit-significant representation of the SCSI address referring to one of the signal
lines, numbered 0 through 7 for an 8-bit bus, or 0 through 15 for a 16-bit bus.
See
also
target ID number.
SCSI ID number The representation of the SCSI address that refers to one of the signal lines
numbered 0 through 15.
SCSI-P cable A 68-conductor (34 twisted-pair) cable generally used for differential bus
connections.
SCSI port (1) Software: The channel controlling communications to and from a specific SCSI
bus in the system. (2) Hardware: The name of the logical socket at the back of the
system unit to which a SCSI device is connected.
serial transmission A method transmission in which each bit of information is sent sequentially on a
single channel rather than simultaneously as in parallel transmission.
service rate The rate at which an entity is able to service requests For example, the rate at
which an Arbitrated Loop is able to service arbitrated requests.
signal converter
See SCSI bus signal converter.
single ended I/O
module
A 16-bit I/O module.
See also I/O module.
single-ended
SCSI bus
An electrical connection where one wire carries the signal and another wire or
shield is connected to electrical ground. Each signal’s logic level is determined by
the voltage of a single wire in relation to ground. This is in contrast to a differential
connection where the second wire carries an inverted signal.
spareset A collection of disk drives made ready by the controller to replace failed members
of a storageset.
storage array An integrated set of storage devices.