IBM 8658 User Guide - Page 89

cabling, requirements, Setting, connector, pin-number, assignments

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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

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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