![background image](http://html2.mh-extra.com/html/ibm/totalstorage-2109-m12/totalstorage-2109-m12_user-manual_3523294067.webp)
buffer-to-buffer
flow
control.
Management
of
the
frame
transmission
rate
in
either
a
point-to-point
topology
or
in
an
arbitrated
loop.
See
also
buffer-to-buffer
credit
.
C
CAM.
Content
addressable
memory.
cascade.
Two
or
more
interconnected
Fibre
Channel
switches
that
can
build
large
fabrics.
Switches
can
be
cascaded
up
to
239
switches,
with
a
recommended
maximum
of
seven
inter-switch
links
(no
path
longer
than
eight
switches).
See
also
fabric
and
inter-switch
link
.
central
processing
unit
(CPU).
A
part
of
a
computer
that
includes
the
circuits
that
control
the
interpretation
and
execution
of
instructions.
A
CPU
in
the
circuitry
and
storage
that
executes
instructions.
Traditionally,
the
complete
processing
unit
was
often
regarded
as
the
CPU,
whereas
today
the
CPU
is
often
a
microchip.
In
either
case,
the
centrality
of
a
processor
or
processing
unit
depends
on
the
configuration
of
the
system
or
network
in
which
it
is
used.
chassis.
The
metal
frame
in
which
the
switch
and
switch
components
are
mounted.
circuit.
An
established
communication
path
between
two
ports.
Consists
of
two
virtual
circuits
capable
of
transmitting
in
opposite
directions.
See
also
link
.
class
1.
Service
that
provides
a
dedicated
connection
between
two
ports
(also
called
connection-oriented
service),
with
notification
of
delivery
or
nondelivery.
class
2.
Connectionless
service
between
ports
with
notification
of
delivery
or
nondelivery.
class
3.
Connectionless
service
between
ports
without
notification
of
delivery.
Other
than
notification,
the
transmission
and
routing
of
class
3
frames
is
the
same
as
class
2
frames.
class
F.
Connectionless
service
for
inter-switch
control
traffic.
Provides
notification
of
delivery
or
nondelivery
between
two
expansion
ports
(E_ports).
class
of
service.
A
specified
set
of
delivery
characteristics
and
attributes
for
frame
delivery.
CLI.
See
command
line
interface
.
CMI.
Control
message
interface.
comma.
A
unique
pattern
(either
1100000
or
0011111)
used
in
8b/10b
encoding
to
specify
character
alignment
within
a
data
stream.
See
also
K28.5
.
command
line
interface
(CLI).
Interface
that
depends
entirely
on
the
use
of
commands,
such
as
through
Telnet
or
simple
network
management
protocol
(SNMP),
and
does
not
involve
a
graphical
user
interface.
community
(SNMP).
A
relationship
between
a
simple
network
management
protocol
(SNMP)
agent
and
a
set
of
SNMP
managers
that
defines
authentication,
access
control,
and
proxy
characteristics.
compact
flash.
Flash
memory
that
stores
the
run-time
operating
system
and
is
used
like
hard
disk
storage.
Not
visible
within
the
memory
space
of
the
processor.
Data
is
stored
in
file
system
format.
Also
called
user
flash.
control
processor
(CP).
The
central
processing
unit
that
provides
all
control
and
management
functions
in
a
switch.
control
processor
card
(CP
card).
The
central
processing
unit
of
the
director/switch,
which
contains
two
control
processor
(CP)
card
slots
to
provide
redundancy.
Provides
Ethernet,
serial,
and
modem
ports
with
the
corresponding
light-emitting
diodes
(LEDs).
core
switch.
A
switch
whose
main
task
is
to
interconnect
other
switches.
Also
referred
to
as
a
backbone
switch.
See
also
edge
switch
.
CP.
See
control
processor
.
CP
card.
See
control
processor
card
.
CPLD.
Complex
programmable
logic
device.
CPU.
See
central
processing
unit
.
CRC.
See
cyclic
redundancy
check
.
credit.
When
applied
to
a
switch,
the
maximum
number
of
receive
buffers
provided
by
a
fabric
port
(F_port)
or
fabric
loop
port
(FL_port)
to
its
attached
node
port
(N_port)
or
node
loop
port
(NL_port),
respectively,
such
that
the
N_port
or
NL_port
can
transmit
frames
without
over-running
the
F_port
or
FL_port.
CSA.
Canadian
Standards
Association.
cut-through.
A
switching
technique
that
allows
the
route
for
a
frame
to
be
selected
as
soon
as
the
destination
address
is
received.
See
also
route
.
cyclic
redundancy
check
(CRC).
A
check
for
transmission
errors
included
in
every
data
frame.
D
data
communications
equipment
(DCE)
port.
A
port
that
is
capable
of
interfacing
between
a
data
terminal
equipment
(DTE)
port
and
a
transmission
circuit.
DCE
devices
with
an
RS–232
(or
EIA–232)
port
interface
transmit
on
pin
3,
and
receive
on
pin
2.
See
also
data
terminal
equipment
(DTE)
port
.
Glossary
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