Glossary

D

database

A collection of data with a given structure for accepting, storing, and providing on-demand data for multiple users. (T)

data directory

Critical information for all managed products (including directors and switches). Information stored here includes:

•All configuration data

•All log files

•Call-home settings

•Firmware library

•Zoning library

datagram

Synonym for Class 3 Fibre Channel service.

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).