data
rate.
The
rate
at
which
data
is
transmitted
or
received
from
a
device.
Interactive
applications
tend
to
require
a
high
data
rate,
while
batch
applications
can
usually
tolerate
lower
data
rates.
data
terminal
equipment
(DTE)
port.
A
port
that
is
capable
of
interfacing
to
a
transmission
circuit
through
a
connection
to
a
data
communications
equipment
(DCE)
port.
DTE
devices
with
an
RS–232
(or
EIA–232)
port
interface
transmit
on
pin
3,
and
receive
on
pin
2
in
a
9–pin
connector
(reversed
in
25–pin
connectors).
See
also
data
communications
equipment
(DCE)
port
.
DB-9
connector.
A
9–pin
version
of
the
RS–232C
port
interface.
DCC.
A
dc
converter.
DCE
port.
See
data
communications
equipment
(DCE)
port
.
DDR.
Double
data
rate.
See
data
rate
.
defined
zone
configuration.
The
complete
set
of
all
zone
objects
that
are
defined
in
the
fabric.
The
defined
configuration
can
include
multiple
zone
configurations.
See
also
enabled
zone
configuration
and
zone
configuration
.
device.
Hosts
and
storage
that
connect
to
a
switch.
Example
devices
are
servers,
redundant
array
of
independent
disks
(RAID)
arrays,
and
tape
subsystems.
device
connection
controls.
Enables
organizations
to
bind
an
individual
device
port
to
a
set
of
one
or
more
switch
ports.
Device
ports
are
specified
by
a
worldwide
name
(WWN)
and
typically
represent
host
bus
adapters
(HBAs)
(servers).
See
also
access
control
lists
.
DID.
The
3-byte
destination
ID
of
the
destination
device,
in
the
0xDomainAreaALPA
format.
direct
memory
access
(DMA).
The
transfer
of
data
between
memory
and
an
input/output
device
without
processor
intervention.
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.
See
direct
memory
access
.
DNS.
Distributed
name
server.
domain_ID.
Unique
identifier
for
the
switch
in
a
fabric.
Usually
automatically
assigned
by
the
switch,
but
can
also
be
assigned
manually.
Can
be
any
value
between
1—239.
DRAM.
See
dynamic
random
access
memory
.
DTE
port.
See
data
terminal
equipment
(DTE)
port
.
dual
fabric.
Two
identical
fabrics
that
allow
redundancy
in
the
event
that
one
fabric
fails.
Use
a
dual
fabric
for
mission
critical
applications.
dual-fabric
SAN.
A
storage
area
network
(SAN)
that
is
composed
of
two
independent
fabrics.
Synonymous
with
multi-fabric
SAN.
The
two-fabric
architecture
makes
dual-fabric
SANs
redundant.
DWDM.
Dense
wavelength
digital
multiplexing.
dynamic
load
sharing
(DLS).
Dynamic
distribution
of
traffic
over
available
paths.
Allows
for
recomputing
of
routes
when
a
fabric
port
or
fabric
loop
port
(Fx_port)
or
expansion
port
(E_port)
changes
status.
dynamic
random
access
memory
(DRAM).
A
storage
in
which
the
cells
require
repetitive
application
of
control
signals
to
retain
stored
data.
E
edge
fabric.
A
single
fabric
that
uses
two
or
more
switches
as
a
core
to
interconnect
multiple
edge
switches.
Synonymous
with
dual-core
fabric.
See
also
resilient
core
.
edge
switch.
A
switch
whose
main
task
is
to
connect
nodes
into
the
fabric.
See
also
core
switch
.
E_D_TOV.
See
error
detect
timeout
value
.
EE_credit.
See
end-to-end
credit
.
effective
zone
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
Industries
Alliance.
EIA
rack.
A
storage
rack
that
meets
the
standards
set
by
the
Electronics
Industries
Alliance
(EIA).
electromagnetic
compatibility
(EMC).
The
design
and
test
of
products
to
meet
legal
and
corporate
specifications
dealing
with
the
emissions
and
susceptibility
to
frequencies
in
the
radio
spectrum.
Electromagnetic
compatibility
is
the
ability
of
various
electronic
equipment
to
operate
properly
in
the
intended
electromagnetic
environment.
electromagnetic
interference
(EMI).
Waves
of
electromagnetic
radiation,
including
but
not
limited
to
radio
frequencies,
generated
by
the
flow
of
electric
current.
electrostatic
discharge
(ESD).
The
flow
of
current
that
results
when
objects
having
a
static
charge
come
into
close
enough
proximity
to
discharge.
46
IBM
TotalStorage
SAN
Switch:
2109
Model
M12
and
Model
M14
User’s
Guide
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