Appendix
C.
Connecting
SCSI
Devices
to
the
Adapter
This
appendix
describes
how
to
lay
out
a
SCSI
chain,
set
SCSI
addresses,
and
terminate
SCSI
devices
and
the
adapter.
SCSI
devices
are
attached
to
a
SCSI
adapter
in
a
chain.
Devices
in
a
chain
can
be
internal
(inside
your
system
unit)
or
external
(connected
outside
your
system
unit).
If
you
are
connecting
more
than
one
SCSI
device,
it
is
important
that
you
plan
the
layout
of
your
SCSI
chain.
Note:
A
terminator
is
required
at
each
end
of
the
SCSI
chain.
Each
channel
on
the
adapter
has
a
terminator
that
is
automatically
enabled
when
a
cable
is
attached
to
either
the
external
or
internal
connector.
The
PCI-X
Dual
Channel
Ultra320
SCSI
Adapter
does
not
support
simultaneously
attaching
to
the
internal
and
external
connectors
on
a
channel.
To
share
a
subsystem
with
a
second
adapter,
see
the
following
figure.
The
subsystem
redirects
each
adapter
to
a
common
internal
SCSI
bus.
External
Low-Voltage
Differential
Connection
The
interconnection
cable,
which
has
VHDCI
connectors,
is
provided
with
the
external
subsystem.
A
Adapter
C0
Channel
0
connector
C1
Channel
1
connector
S
Low
voltage
differential
subsystem
T
Terminator
T0
Channel
0
terminator
T1
Channel
1
terminator
33
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