System information

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Eclipse™ 2640 SAN Router Administration and Configuration Manual
Glossary
natural disasters (fires and floods). There are many ways to minimize
these threats to data integrity such as backing up data regularly,
controlling access to data via security mechanisms, designing user
interfaces that prevent the input of invalid data, and using error
detection and correction software when transmitting data.
data recovery Salvaging data stored on damaged media, such as magnetic disks
and tapes. There are a number of software products that can help
recover data damaged by a disk crash or virus. Of course, not all data
is recoverable, but data recovery specialists can often restore a
surprisingly high percentage of the data on damaged media.
dB See decibel.
dBm Decibels referenced to one milliwatt. Zero dBm equals one milliwatt,
with a logarithmic relationship as the value increases (D).
DC See direct current.
decibel Abbreviated as dB. A standard unit used to express gain or loss of
optical power, expressed as the ratio of input power to output power
on a logarithmic basis (D).
default Pertaining to an attribute, value, or option that is assumed by a
system when none is explicitly specified (D, I).
default zone A zone that contains all attached devices that are not members of a
separate active zone.
destination A point or location, such as a processor, director or switch, or server,
to which data is transmitted (D).
destination address D_ID. An address identifier that indicates the targeted destination of
a data frame.
device (1) Mechanical, electrical, or electronic hardware with a specific
purpose (D). See also
managed product.
(2) See node.
diagnostics (1) The process of investigating the cause or nature of a problem in a
product or system (D). (2) Procedures or tests used by computer
users and service personnel to diagnose hardware or software
problems (D).