Connecting
RIO
and
SPCN
Cables
The
RIO
and
SPCN
cables
provide
two
functions
in
the
system:
remote
data
bus
connection
and
power
control.
The
following
basic
rules
must
be
followed
when
connecting
these
two
types
of
cables:
v
The
I/O
drawers
must
be
connected
in
a
loop
fashion
for
both
the
RIO
cables
and
the
SPCN
cables.
The
loop
connection
provides
redundant
paths
so
that
if
a
failure
occurs
in
part
of
a
cable,
the
system
will
continue
to
operate.
If
a
failure
occurs,
a
warning
message
is
displayed
on
the
system
console
but
the
system
continues
to
operate.
v
One
loop
is
required
for
the
SPCN
cabling.
This
loop
begins
and
ends
at
the
primary
I/O
drawer.
v
Two
loops
are
possible
for
the
RIO
cabling,
depending
on
the
number
and
desired
configuration
of
I/O
drawers.
These
loops
begin
and
end
at
the
primary
I/O
drawer.
Chapter
1.
Reference
Information
49
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