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Extended Industry Standard Architecture (EISA). The PC bus standard that extends the AT bus (ISA bus) to 32
bits and provides support for bus master. It was announced in 1988 as a 32-bit alternative to the Micro Channel that
would preserve investment in existing boards. PC and AT cards (ISA cards) can plug into an EISA bus.
F
fabric. A complex network using hubs, switches and gateways. For example, Fibre Channel uses a fabric to connect
devices. A fabric can be as simple as a single cable connecting two devices.
failback. The restoration of the NAS Gateway 500 to its initial configuration after detection and repair of a failed
network or component.
failover. (1) The automatic recovery of resources in the event of a network outage, or failure of the hardware or
software. (2) A cluster event in which the primary database server or application server switches to a backup system
due to the failure of the primary server.
failure. (1) The termination of the ability of a functional unit to perform its required function. (2) An uncorrected
hardware error. Failures are either recoverable or not recoverable by the software or the operator. The operator is
always notified when failures occur. Contrast with error.
fallover. Also called failover. The process of an active node acquiring resources previously owned by another node,
in order to maintain availability of those resources.
fallback. Also called failback. Process of a joining or reintegrating node acquiring resources previously owned by
another node.
Fast Etherchannel (FEC). A proprietary technology developed by Cisco that creates a team of two to four 10/100
Ethernet adapters or ports to increase transmission and reception throughput. Adapter fault tolerance is also supported
by this technology.
Fast Ethernet. An Ethernet standard that provides a data rate of 100 Mbps.
feature code. A code used by IBM to process hardware and software orders.
FEC. See Fast Etherchannel.
Federal Communications Commission (FCC). A board of commissioners appointed by the President under the
Communications Act of 1934, having the power to regulate all interstate and foreign communications by wire and radio
originating in the United States.
fiber optic cable. See optical cable.
field-replaceable unit (FRU). An assembly that is replaced in its entirety when any one of its components fails. In
some cases, a FRU may contain other FRUs. Contrast with customer-replaceable unit.
File Transfer Protocol (FTP). In the Internet suite of protocols, an application layer protocol that uses TCP/IP and
Telnet services to transfer bulk-data files between machines or hosts.
flash memory. A type of non-volatile storage device that must be erased in fixed blocks rather than single bytes.
FRU. See field-replaceable unit.
FTP. See File Transfer Protocol.
G
gateway. A device that acts as a router to transfer packets between networks, but occurs at the transport layer. See
also router.
GB. see gigabyte.
GBIC. See Gigabit Interface Converter.
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Glossary
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