Chapter
3.
Power
distribution
system
The
power
subsystem
for
the
M12
and
M14
switches
is
a
redundant
+48
V
dc
power
distribution
system
with
a
provision
for
up
to
four
1000–watt,
48
V
dc
bulk
power
supplies.
Bulk
power
supplies
produce
the
intermediate
distribution
voltage
in
the
distributed
power
system.
See
Table
2
for
the
power
distribution
system
specifications.
Table
2.
Power
distribution
system
specifications
Specification
Value
Input
voltage
A
fully
loaded
switch
requires
a
maximum
of
2200
Volt-Amps.
This
results
in
a
mains
current
of
9
amps
at
240
V
ac
line
voltage
or
10
amps
at
208
V
ac
line
voltage.
The
rated
ac
input
range
is
180–264
V
ac.
Supported
power
range
Nominal:
200–240
V
ac,
single
phase
Input
frequency
range
47–63
Hz
Power
supplies
(each)
Output
voltages:
48
V
at
20
amps;
12
V
at
4
amps
Maximum
output
power:
1000
watts
ac
Inrush
current
40
amps
maximum,
peak
Ride
through
The
power
supply
outputs
remain
within
specified
regulation
for
a
minimum
of
20
msec
after
the
ac
mains
are
disconnected.
Under
voltage
protection
The
power
supply
self-protects
from
any
input
voltage,
static
or
dynamic,
from
zero
volts
to
its
operating
ranges.
It
recovers
to
normal
operation
when
it
returns
to
its
operating
range.
Power
distribution
strategy
All
power
for
the
blades
comes
from
a
single
48
V
intermediate
power
bus.
Great
care
is
taken
at
each
load
to
assure
the
integrity
of
the
power
bus.
The
power
supplies
also
provide
a
separate
12
V
AUX
voltage.
This
is
used
throughout
the
system
to
power
the
I
²
C
logic
and
to
monitor
and
control
different
system
states.
AC
input
Each
ac
input
has
an
on-off
circuit
breaker
switch.
The
power
supply
modules
include
input
power
filtering
and
power
indicator
LEDs.
The
power
supply
output
remains
within
specific
regulation
for
a
minimum
of
20
msec
after
the
ac
mains
have
been
disconnected.
Two
detachable
line
cords
provide
ac
input
power
to
the
chassis.
DC
outputs
The
M12
and
M14
switches
can
use
up
to
four
power
supplies,
all
of
which
are
hot-swappable
(see
Figure
1
on
page
3
and
Figure
2
on
page
4
for
the
location
of
the
power
supplies,
power
supply
filler
panels,
and
the
ac
input
switches
and
inputs).
Two
power
supplies
receive
input
power
from
one
of
the
ac
inputs.
The
remaining
two
power
supplies
receive
power
from
the
other
ac
input.
Only
two
©
Copyright
IBM
Corp.
2004
11
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