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diskette drive
The hardware mechanism by which a computer reads data from and
writes data to removable diskettes (D).
DNS name
Domain name system or domain name service. Host or node name
for a device or managed product that is translated to an Internet pro-
tocol (IP) address through a domain name server.
domain
A Fibre Channel term describing the most significant byte in the node
port (N_Port) identifier for the Fibre Channel device. It is not used in
the Fibre Channel small computer system interface (FC-SCSI) hard-
ware path ID. It is required to be the same for all SCSI targets logically
connected to a Fibre Channel adapter.
Domain identifier. A number that uniquely identifies a switch in a
domain ID
multiswitch fabric. A distinct domain ID is automatically allocated to
each switch in the fabric by the principal switch. The preferred
domain ID is the domain ID value that a switch requests from the
principal switch. If the value has not been allocated to another switch
in the fabric, it will be granted by the principal switch and will
become the requesting switch's active domain ID. The active domain
ID is the domain ID that has been assigned by the principal switch
and that a switch is currently using.
domain name server
In TCP/IP, a server program that supplies name-to-address transla-
tion by mapping domain name to internet addresses. (D)
See
dynamic random access
memory.
DRAM
drop-down menu
A menu that appears when a heading in a navigation bar is clicked on
with the mouse. The objects that appear in the drop-down menus are
organize by their headings in the navigation bar.
In data communication, pertaining to transmission in which data is
duplex
sent and received at the same time (D). Contrast with
half
duplex.
duplex connector
An optical fiber component that terminates jumper cable fibers in one
housing and provides physical keying for attachment to a duplex
receptacle (D).
duplex receptacle
A fixed or stationary optical fiber component that provides a keyed
attachment method for a duplex connector (D).
A connection between two ports, established or removed by the
dynamic connection
directors and that, when active, appears as one continuous link. See
Glossary
525
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