DEC 4000 AXP Service Manual page 219

DSSI VMScluster
A VMScluster system that uses the DSSI bus as the interconnect between DSSI
disks and systems.
DUP server
The Diagnostic Utility Program (DUP) server is a firmware program on-board
DSSI devices that allows a user to set host to a specified device in order to run
internal tests or modify device parameters.
ECC
Error correction code. Code and algorithms used by logic to facilitiate error
detection and correction. See also ECC error; EDC logic.
ECC error
An error detected by EDC logic, to indicate that data (or the protected ''entity''
has been corrupted. The error may be correctable (ECC error) or uncorrectable
(ECCU error). See also EDC logic.
EDC logic
Error detection and correction logic. Used to detect and correct errors. See also
ECC; ECC error.
EEPROM
Electrically erasable programmable read-only memory. A memory device that can
be byte-erased, written to, and read from. Contrast with FEPROM.
environment variable
Global data structures that can be accessed from console mode. The setting
of these data structures determines how a system powers up, boots operating
system software, and operates.
Ethernet
A local area network that was originally developed by Xerox Corporation and has
become the IEEE 802.3 standard LAN. Ethernet LANs use bus topology.
Ethernet ports
The connectors through which the Ethernet is connected to the system.
extents
The physical locations in a storage device allocated for use by a particular data
set.
Glossary–9