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DDR. Double data rate.
defined zone configuration. The complete set of all
zone objects that are defined in the fabric. The defined
configuration may include multiple zone configurations.
See also enabled zone configuration, zone
configuration.
DID. The 3-byte destination ID of the destination
device, in the 0xDomainAreaALPA format.
disparity. The relationship of ones and zeros in an
encoded character. Neutral disparity means an equal
number of each, positive disparity means a majority of
ones, and negative disparity means a majority of zeros.
DLS. See dynamic load sharing.
DMA. Direct memory access.
DNS. Distributed name server.
domain_ID. Unique identifier for the switch in a fabric.
Usually automatically assigned by the switch, but may
also be assigned manually. May be any value between
1- 239.
DOS. Disk operating system.
DRAM. Dynamic random access memory.
DWDM. Dense wavelength digital multiplexing.
dynamic load sharing (DLS). Dynamic distribution of
traffic over available paths. Allows for recomputing of
routes when an Fx_port or E_port changes status.
E_D_TOV. See error detect timeout value.
EE_Credit. See end-to-end credit.
effective configuration. The particular zone
configuration that is currently in effect. Only one
configuration can be in effect at once. The effective
configuration is built each time a zone configuration is
enabled.
EIA. Electronic Industry Association.
EIA rack. A storage rack that meets the standards set
by the Electronics Industry Association.
ELP. Extended link parameters.
EMC. Electro-magnetic compatibility.
EMI. Electromagnetic interference.
enabled zone configuration. The currently enabled
configuration of zones. Only one configuration can be
enabled at a time. See also defined zone configuration,
zone configuration.
end-to-end credit (EE_Credit). The number of receive
buffers allocated by a recipient port to an originating
port. Used by class 1 and class 2 services to manage
the exchange of frames across the fabric between
source and destination. See also end-to-end flow
control, buffer-to-buffer credit.
end-to-end flow control. Governs flow of class 1 and
class 2 frames between N_ports. See also end-to-end
credit.
E_port. See expansion port.
error. As applies to fibre channel, a missing or
corrupted frame, timeout, loss of synchronization, or
loss of signal (link errors). See also loop failure.
error detect timeout value (E_D_TOV). The time that
the switch waits for an expected response before
declaring an error condition. Adjustable in 1
microsecond increments from 2 - 10 seconds.
ESD. Electrostatic discharge.
EVPD. Enable Vital Product Data.
exchange. The highest level fibre-channel mechanism
used for communication between N_ports. Composed of
one or more related sequences, and can work in either
one or both directions.
expansion port (E_port). A port is designated an
E_port when it is used as an inter-switch expansion port
to connect to the E_port of another switch, to build a
larger switch fabric.
Extended Fabrics. A product that runs on Fabric OS
and allows creation of a fibre-channel fabric
interconnected over distances of up to 100 km (62.14
mi).
fabric. A network that uses high-speed fibre
connections to connect switches, hosts, and devices. A
fabric is an active, intelligent, nonshared interconnect
scheme for nodes.
Fabric Assist. A feature that enables private and
public hosts to access public targets anywhere on the
fabric, provided they are in the same Fabric Assist zone.
This feature is available only when both QuickLoop and
zoning are installed on the switch.
fabric login (FLOGI). The process by which a device
gains access to the fabric.
fabric loop port (FL_port). A fabric port that is loop
capable. Used to connect NL_ports to the switch in a
loop configuration.
fabric name. The unique identifier assigned to a fabric
and communicated during login and port discovery.
fabric port (F_port). A port that is able to transmit
under fabric protocol and interface over links. Can be
used to connect an N_port to a switch. See also fabric
loop port, Fx_port.
47
Glossary
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