HSG80 ACS Solution Software Version 8.7 for Compaq Tru64 UNIX Installation and Configuration Guide

Glossary
Glossary–6 HSG80 ACS Solution Software Version 8.7 for Compaq Tru64 UNIX Installation and
Configuration Guide
DWZZA
A StorageWorks SCSI bus signal converter used to connect 8-bit
single-ended devices to hosts with 16-bit differential SCSI adapters.
This converter extends the range of a single-ended SCSI cable to the
limit of a differential SCSI cable.
DWZZB
A StorageWorks SCSI bus signal converter used to connect a variety of
16-bit single-ended devices to hosts with 16-bit differential SCSI
adapters.
ECB
External cache battery. The unit that supplies backup power to the
cache module in the event the primary power source fails or is
interrupted.
ECC
Error checking and correction.
EDC
Error detection code.
EIA
The abbreviation for Electronic Industries Association. EIA is a
standards organization specializing in the electrical and functional
characteristics of interface equipment.
EMU
Environmental monitoring unit. A unit that provides increased
protection against catastrophic failures. Some subsystem enclosures
include an EMU which works with the controller to detect conditions
such as failed power supplies, failed blowers, elevated temperatures,
and external air sense faults. The EMU also controls certain cabinet
hardware including DOC chips, alarms, and fan speeds.
ESD
Electrostatic discharge. The discharge of potentially harmful static
electrical voltage as a result of improper grounding.
extended
subsystem
A subsystem in which two cabinets are connected to the primary
cabinet.
external cache
battery
See ECB.
F_Port
A port in a fabric where an N_Port or NL_Port may attach.
fabric
A group of interconnections between ports that includes a fabric
element.
failback
The process of restoring data access to the newly-restored controller in
a dual-redundant controller configuration. See also failover.