I/O
Drawer
Features
I/O
drawers
may
have
two
redundant
power
supplies.
One
of
these
power
supplies
is
capable
of
providing
the
necessary
voltages
and
currents
independently
of
the
other.
The
left
and
right
power
supply
output
voltages
are
connected
and
monitored
by
the
power
distribution
board
contained
in
the
5
EIA-unit
I/O
drawer.
Both
power
supplies
provide
+12
V
dc
to
the
fans
in
the
drawer
to
ensure
sufficient
cooling
if
one
of
the
supplies
fails.
However,
the
short
circuit
prevention
is
on
the
I/O
board
to
protect
against
shorts
in
one
output,
thus
causing
the
+12
V
dc
to
fail
completely.
The
left
and
right
power
supplies
are
hot-pluggable
and
may
be
changed
one-at-a-time
while
the
system
is
operational.
Each
power
supply
provides
5
V
dc,
3.3
V
dc,
12
V
dc,
and
5
V
dc
standby
power.
The
5
V
dc
standby
power
is
provided
by
both
power
supplies;
this
can
be
done
because
the
power
supplies
contain
overload
protection
against
one
supply
shorting
the
other.
Standby
power
(5
V
dc)
is
provided
to
the
part
of
the
primary
I/O
drawer
planar
on
which
the
SPCN
and
service
processor
logic
reside.
I/O
Drawer
Addressing
I/O
drawer
addressing
refers
to
the
drawer
number
that
is
displayed
in
the
operator
panel
on
secondary
I/O
drawers.
This
address
is
the
drawer’s
location
in
the
RIO
(remote
I/O)
loop.
The
drawer
number
is
displayed
in
the
form
of
U0.n
,
where
n
is
the
drawer
number.
The
drawer
number
is
not
displayed
on
the
primary
I/O
drawer
operator
panel
but
it
is
assumed
to
be
*01
(or
U0.1).
The
first
time
you
boot
the
system
after
a
service
action
or
configuration
change
that
involves
an
I/O
drawer
or
its
backplane,
the
system
may
detect
a
duplicate
or
incorrect
I/O
drawer
number.
This
situation
can
result
in
duplicate
or
incorrect
drawer
numbers
being
displayed
when
the
system
is
booting
up.
The
final
drawer
number
will
be
assigned
and
displayed
when
the
bootup
is
complete.
The
drawer
numbers
are
not
reassigned
unless
a
service
action
or
configuration
chance
occurs.
When
ac
power
(dc
power
in
a
dc-powered
system)
has
been
disconnected
from
an
I/O
drawer
and
then
reconnected,
the
I/O
drawer
addresses
on
the
secondary
drawers
will
temporarily
appear
in
the
format
*0n
,
where
n
is
the
drawer
number.
After
the
system
is
powered
on
and
the
boot
sequence
has
been
initiated,
the
drawer
numbers
will
be
restored
to
the
U0.n
format.
24
Service
Guide
Summary of Contents for RS/6000 Enterprise Server M80
Page 1: ...RS 6000 Enterprise Server Model M80 Eserver pSeries 660 Model 6M1 Service Guide SA38 0571 01...
Page 10: ...x Service Guide...
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Page 16: ...xvi Service Guide...
Page 22: ...Data Flow 4 Service Guide...
Page 30: ...CEC Card Cage Rear of CEC drawer viewed from top cover removed 12 Service Guide...
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Page 485: ...Chapter 11 Parts Information This chapter contains parts information for the system 467...
Page 486: ...CEC Drawer Card Assembly 9 468 Service Guide...
Page 488: ...CEC Drawer Backplane 5 2a 1 2 3 4 470 Service Guide...
Page 490: ...CEC Drawer Power Supplies 1 2 3 4 5 6 7 8 9 472 Service Guide...
Page 492: ...CEC Drawer Fan Assemblies 2 1 3 4 5 6 8 9 10 11 12 13 7 14 474 Service Guide...
Page 496: ...7 8 9 10 6 1 2 3 4 4 5 478 Service Guide...
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