arbitrate
primitive
signal
(ARB).
A
primitive
signal
that
is
transmitted
as
the
fill
word
by
a
loop
port
(L_port)
to
indicate
that
the
L_port
is
arbitrating
to
access
to
the
loop.
Applies
only
to
the
arbitrated
loop
topology.
arbitrated
loop.
A
shared
100
MBps
Fibre
Channel
transport
structured
as
a
loop
and
supporting
up
to
126
devices
and
one
fabric
attachment.
A
port
must
successfully
arbitrate
before
a
circuit
can
be
established.
arbitrated
loop
physical
address
(AL_PA).
An
8–bit
value
used
to
uniquely
identify
an
individual
port
within
a
loop.
A
loop
can
have
one
or
multiple
AL_PAs.
arbitration
wait
timeout
value
(AW_TOV).
The
minimum
time
an
arbitrating
loop
port
(L_port)
waits
for
a
response
before
beginning
loop
initialization.
area
number.
A
number
that
is
assigned
to
each
potential
port
location
in
the
switch.
Used
to
distinguish
ports
that
have
the
same
port
number
but
are
on
different
port
cards.
ASIC.
See
application-specific
integrated
circuit
.
asynchronous
transfer
mode
(ATM).
A
broadband
technology
for
transmitting
data
over
local
area
networks
(LANs)
or
wide
area
networks
(WANs),
based
on
relaying
cells
of
fixed
size.
Provides
any-to-any
connectivity,
and
nodes
can
transmit
simultaneously.
ATM.
See
asynchronous
transfer
mode
.
auto-negotiate
speed.
Process
that
allows
two
devices
at
either
end
of
a
link
segment
to
negotiate
common
features,
speed
(for
example,
1
Gbps
or
2
Gbps)
and
functions.
autoranging.
A
power
supply
that
accommodates
different
input
voltages
and
line
frequencies.
autosense.
Process
during
which
a
network
device
automatically
senses
the
speed
of
another
device.
AW_TOV.
See
arbitration
wait
timeout
value
.
B
backup
FCS
switch.
The
switch
or
switches
assigned
as
backup
in
case
the
primary
fabric
configuration
server
(FCS)
switch
fails.
See
also
fabric
configuration
server
switch
and
primary
FCS
switch
.
bandwidth.
(1)
The
total
transmission
capacity
of
a
cable,
link,
or
system.
Usually
measured
in
bits
per
second
(bps).
(2)
The
range
of
transmission
frequencies
available
to
a
network.
See
also
throughput
.
basic
input/output
system
(BIOS).
Code
that
controls
basic
hardware
operations,
such
as
interactions
with
diskette
drives,
hard
disk
drives,
and
the
keyboard.
BB_credit.
See
buffer-to-buffer
credit
.
beacon.
When
all
the
port
light-emitting
diodes
(LEDs)
on
a
switch
are
set
to
flash
from
one
side
of
the
switch
to
the
other,
to
enable
identification
of
an
individual
switch
in
a
large
fabric.
A
switch
can
be
set
to
beacon
by
Telnet
command
or
through
Web
Tools.
beginning
running
disparity.
The
disparity
at
the
transmitter
or
receiver
when
the
special
character
associated
with
an
ordered
set
is
encoded
or
decoded.
See
also
disparity
.
BER.
See
bit
error
rate
.
BIOS.
See
basic
input/output
system
.
BISR.
Built-in
self-repair.
bit
error
rate
(BER).
The
rate
at
which
bits
are
expected
to
be
received
in
error.
Expressed
as
the
ratio
of
error
bits
to
total
bits
transmitted.
See
also
error
.
blade.
One
component
in
a
system
that
is
designed
to
accept
some
number
of
components
(blades).
Blades
could
be
individual
servers
that
plug
into
a
multiprocessing
system
or
individual
port
cards
that
add
connectivity
to
a
switch.
A
blade
is
typically
a
hot
swappable
hardware
device.
See
16-port
card
.
blind-mate
connector.
A
two-way
connector
used
in
some
switches
to
provide
a
connection
between
the
system
board
and
the
power
supply.
block.
As
applies
to
fibre
channel,
upper-level
application
data
that
is
transferred
in
a
single
sequence.
bloom.
Application-specific
integrated
circuit
(ASIC)
technology
that
the
2109
Model
M12
is
based
on.
boot
flash.
Flash
memory
that
stores
the
boot
code
and
boot
parameters.
The
processor
runs
its
first
instructions
from
boot
flash.
Data
is
cached
in
random
access
memory
(RAM).
boot
monitor.
Code
used
to
initialize
the
control
processor
(CP)
environment
after
powering
on.
Identifies
the
amount
of
memory
available
and
how
to
access
it,
and
retrieves
information
about
system
buses.
British
thermal
unit
(BTU).
A
measurement
of
heat
produced
in
one
hour.
broadcast.
The
transmission
of
data
from
a
single
source
to
all
devices
in
the
fabric,
regardless
of
zoning.
See
also
multicast
and
unicast
.
BTU.
See
British
thermal
unit
.
buffer-to-buffer
credit.
The
number
of
frames
that
can
be
transmitted
to
a
directly-connected
recipient
or
within
an
arbitrated
loop.
Determined
by
the
number
of
receive
buffers
available.
See
also
buffer-to-buffer
flow
control
.
44
IBM
TotalStorage
SAN
Switch:
2109
Model
M12
and
Model
M14
User’s
Guide
Содержание TotalStorage 2109 M12
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