Hitachi 9900 Series - Manual (Page 65)

EBCDIC
Abbreviation of Extended Binary-Coded Decimal Interchange Code. Pronounced
eb-sih-dik, EBCDIC is an IBM
® code for representing characters as numbers.
Although it is widely used on large IBM ® computers, most other computers, including
PCs and Macintoshes ® , use ASCII codes. See also ASCII, binary, synchronous, and
asynchronous.
Electronic vaulting
The transfer of data to an offsite storage facility via a communication link rather than
via portable media. Typically, electronic vaulting is used for batch or journaled updates
to critical files to supplement full backups that are taken periodically.
ESA/390 ®
Enterprise Systems Architecture/390 ® . Often abbreviated S/390 ® , ESA/390 ® is an IBM ®
architecture for mainframe computers and peripherals. Processor systems that follow
this architecture include the IBM ES/9000
® family. In 2000, IBM ® changed the server
series name to eServer zSeries.
ESCON ®
Enterprise Systems Connection architecture is an IBM ® mainframe ESA/390 ®
computer peripheral interface or connection between two mainframes for data
exchange. The I/O interface utilizes ESA/390
® logical protocols over a serial interface
that configures attached units to a communication fabric. ESCON ® is based on
networking technology. ESCON ® provides direct channel-to-channel connections
between mainframe systems over fiber-optic links at distances up to 43 kilometers or
25 miles. ESCON
® also provides a way for communication controllers and other
devices to share a single channel to a mainframe.
ESCON Director
An I/O interface switch that allows the interconnection of multiple ESCON ®
interfaces in a distributed-star topology.
Ethernet
A Local Area Network (LAN) protocol developed by Xerox ® in cooperation with
Digital Equipment and Intel in 1976. Ethernet supports a star or bus topology and
supports a data transfer rate of 10 megabits per second or 10 Mbps. The Ethernet
specification formed the basis of the IEEE 802.3 standard, which specifies the physical
and lower software layers. Ethernet uses the CSMA/CD access method for handling
simultaneous demands and is one of the most widely implemented LAN standards.
Ethernet is also known as 10BaseT. See also Fast Ethernet, Gigabit Ethernet.
Fabric
A group or network of switches arranged in such a way as to enhance scalability and
connectivity.
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