Specifications

GL–6 Glossary
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.
EIA The abbreviation for Electronic Industries Association. EIA is a standards
organization specializing in the electrical and functional characteristics of interface
equipment. Same as Electronic Industries Association.
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.