HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software Troubleshooting Guide (EK-G80TS-SA. C01, March 2005)

Glossary
281HSG60 and HSG80 Array Controller and Array Controller Software Troubleshooting Guide
dual-redundant configuration
A controller configuration consisting of two active controllers operating as a single
controller. If one controller fails, the other controller assumes control of the failing
controller devices.
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.
DWZZA
An HP 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.
See also DOC and SCSI bus signal converter.
DWZZB
An HP StorageWorks SCSI bus signal converter used to connect a variety of 16-bit
single-ended devices to hosts with 16-bit differential SCSI adapters.
See also DOC and SCSI bus signal converter.
DWZZC
The 16-bit, SCSI table-top SCSI bus signal converter used to extend a differential SCSI
bus, or connect a differential SCSI bus to a single-ended SCSI bus.
See also DOC and SCSI bus signal converter.
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 correction code.
EDC
Error detection code.
EIA
Electronic Industries Association. A standards organization specializing in the electrical
and functional characteristics of interface equipment.