The
M12
and
M14
switches
operate
indefinitely
if
a
single
blower
fails.
When
a
blower
assembly
is
removed,
a
mechanical
flap
seals
the
air
chamber
to
maintain
positive
cooling
air
pressure
in
the
chassis
while
the
failed
blower
assembly
is
being
replaced.
Cable
management
The
cable
management
tray
and
cable
pillars
provide
easy
access
to
the
switch
cables
and
allow
you
to
organize
and
maintain
the
cables
easily.
Up
to
128
pairs
of
fibre
optic
cables
can
be
maintained
on
a
single
chassis.
The
cable
management
system
is
designed
to
allow
any
switch
module
to
be
replaced
without
disrupting
service
on
any
adjacent
blade
assemblies.
Worldwide
name
LED
card
The
worldwide
name
(WWN)
LED
card
is
the
neutral
location
to
accommodate
the
worldwide
unique
serial
ID
for
each
logical
switch
on
the
M12
and
M14.
It
is
an
integral
part
of
the
chassis.
The
serial
EEPROM
device
contains
multiple
serial
numbers
for
identifying
the
chassis,
back
plane,
and
the
WWN
card
itself.
As
an
alternative
system
status
indicator,
this
card
consolidates
the
status
of
all
modular
components
in
the
system
on
the
cable
side
and
presents
the
status
to
you
in
the
form
of
LEDs
on
the
noncable
side.
The
arrangement
of
the
LEDs
on
this
card
resembles
the
look
of
status
LEDs
on
the
other
side
of
the
switch.
The
LEDs
provide
the
summary
of
cable-side
system
status
on
the
switch
as
follows:
v
Two
LEDs
per
blade
assembly
on
the
cable
side
of
the
cabinet.
–
Green
indicates
that
the
power
is
OK.
–
Amber
indicates
that
the
blade
needs
attention.
v
Two
LEDs
per
power
supply.
Both
LEDs
are
in
the
same
location.
–
Green
indicates
that
the
power
is
OK.
–
Amber
indicates
that
the
power
supply
needs
attention.
A
worldwide
name
(WWN)
light-emitting
diode
(LED)
card
on
the
non-port
side
that
maintains
chassis-specific
information,
such
as
WWNs,
Internet
Protocol
(IP)
addresses
and
summary
status
information
of
each
blade
assembly
and
power
supply.
Chapter
2.
System
design
overview
9
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