HP 316095-B21 - StorageWorks Edge Switch 2/24 Manual - Page 13

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Glossary

enhanced availability feature

EAF. A backup field-replaceable unit (backup FRU) that is ordered and installed to provide

redundancy and reduce disruption in case of failure.

Enterprise Systems Architecture

ESA™. A computer architecture introduced by IBM in 1988 as ESA/370. The architecture

added access registers to improve virtual memory management and increase storage from 2

gigabyte to 6 terabytes. The architecture was enhanced with the introduction of ESA/390 in

1990.

Enterprise Systems Connection

ESCON™. An IBM architecture, technology, and set of products and services introduced in

1990 that provides a dynamically connected environment using fiber-optic cables as the data

transmission medium.

Enterprise Systems Connection Director

ESCON™ Director. A device that provides connectivity capability and control for attaching

any two links to each other through the ESCON channel. Specifically, any of the hardware

devices provided for interconnecting IBM-compatible mainframe equipment through the

proprietary ESCON channel connection. IBM's model numbers for ESCON directors include

the 9031 and 9033.

E_Port

See

expansion

port.

error-detect time-out value

(E_D_TOV) — User-specified value that defines the time a director or switch waits for an

expected response before declaring an error condition.

error message

Software message that indicates an error was detected. See also

information message

and

warning

message.

Ethernet

A widely implemented local area network (LAN) protocol that uses a bus or star topology and

serves as the basis for the IEEE 802.3 standard, which specifies the physical and software

layers. Baseband LAN allows multiple station access to the transmission medium at will

without prior coordination and which avoids or resolves contention.

Ethernet hub

A customer-supplied device used to LAN-connect the HAFM server and the directors it

manages.

Directors and Edge Switches Glossary