Compaq StorageWorks HSZ80 Configuration And Cli Reference Manual page 345

dual-simplex A communications protocol that allows simultaneous transmission in both
directions in a link, usually with no flow control.
DUART Dual Universal Asynchronous Receiver and Transmitter. An integrated
circuit containing two serial, asynchronous transceiver circuits.
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.
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 one or two cabinets are connected to the primary
cabinet.
external cache See ECB.
battery
failedset A group of failed mirrorset or RAIDset devices automatically created by the
controller.
failover The process that takes place when one controller in a dual-redundant
configuration assumes the workload of a failed companion controller.
Failover continues until the failed controller is repaired or replaced.
Compaq HSZ80 Array Controller ACS Version 8.3 Configuration and CLI Reference Guide
GL–5