SCSI
cabling
requirements
If
you
plan
to
attach
external
SCSI
devices,
you
must
order
additional
SCSI
cables.
To
select
and
order
the
correct
cables
for
use
with
external
devices,
contact
your
IBM
reseller
or
IBM
marketing
representative.
For
information
about
the
maximum
length
of
SCSI
cable
between
the
terminated
ends
of
the
cable,
refer
to
the
ANSI
SCSI
standards.
Adhering
to
these
standards
will
help
ensure
that
your
server
operates
properly.
Setting
SCSI
IDs
Each
SCSI
device
connected
to
a
SCSI
controller
must
have
a
unique
SCSI
ID.
This
ID
enables
the
SCSI
controller
to
identify
the
device
and
ensure
that
different
devices
on
the
same
SCSI
channel
do
not
attempt
to
transfer
data
simultaneously.
SCSI
devices
that
are
connected
to
different
SCSI
channels
can
have
duplicate
SCSI
IDs.
The
hot-swap-drive
backplane
controls
the
SCSI
IDs
for
the
internal
hot-swap
drive
bays.
However,
when
you
attach
SCSI
devices
to
the
external
SCSI
connector,
you
must
set
a
unique
ID
for
the
device.
Refer
to
the
information
that
is
provided
with
the
device
for
instructions
to
set
its
SCSI
ID.
SCSI
connector
pin-number
assignments
The
following
table
shows
the
pin-number
assignments
for
the
68-pin
SCSI
connectors.
34
1
68
35
Table
17.
68-pin
SCSI
connector
pin-number
assignments
Pin
Signal
Pin
Signal
1
+Data
12
35
-Data
12
2
+Data
13
36
-Data
13
3
+Data
14
37
-Data
14
4
+Data
15
38
-Data
15
5
+Data
P1
39
-Data
P1
6
+Data
0
40
-Data
0
7
+Data1
41
-Data
1
8
+Data
2
42
-Data
2
9
+Data
3
43
-Data
3
10
+Data
4
44
-Data
4
11
+Data
5
45
-Data
5
12
+Data
6
46
-Data
6
13
+Data
7
47
-Data
7
14
+Data
P
48
-Data
P
15
Ground
49
Ground
16
DIFFSENS
50
Ground
17
Term
power
51
Term
power
18
Term
power
52
Term
power
Installing
options
79
Summary of Contents for xSeries 230 61Y
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