IBM 8478 Hardware Maintenance Manual - Page 95

cabling, requirements, Setting

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master package. This configuration supports a zero wait state, 32-bit memory transfers at 160 Mbytes/second, when LVD SCSI peripherals are attached. This channel supports up to 15 SCSI devices. In addition, this adapter uses: v Double-transition clocking to achieve high transfer rates v Domain name validation to negotiate compatible data transfer speeds with each device v Cyclic-redundancy checking, instead of the usual parity checking, to significantly improve data reliability Note: If you install a RAID adapter, you can move the SCSI signal cable from the SCSI connector on the SCSI adapter to an internal channel connector on the RAID adapter to control the internal drives from the RAID adapter. SCSI cabling requirements: You can install five internal SCSI devices using the SCSI signal cable that comes with your server. 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. To receive an indication of SCSI hard disk drive activity, you must also connect the SCSI adapter to the SCSI LED (J3) connector on the system board. See "System and PCI extender board options connectors" on page 41 for the location of the SCSI connector. For information about the maximum length of a SCSI cable between the terminated ends of the cable, refer to the American National Standards Institute (ANSI) SCSI standards. Adhering to these standards will help ensure that your server operates correctly. 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. To install external SCSI devices, you must first install an optional SCSI PCI adapter. Refer to the information that is provided with the device for instructions to set its SCSI ID. With a SCSI adapter installed in your server, you can use its 68-pin SCSI connector to connect different types of SCSI devices. The following table shows the pin-number assignments for the SCSI connector. Chapter 5. Installing options 85

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master
package.
This
configuration
supports
a
zero
wait
state,
32-bit
memory
transfers
at
160
Mbytes/second,
when
LVD
SCSI
peripherals
are
attached.
This
channel
supports
up
to
15
SCSI
devices.
In
addition,
this
adapter
uses:
v
Double-transition
clocking
to
achieve
high
transfer
rates
v
Domain
name
validation
to
negotiate
compatible
data
transfer
speeds
with
each
device
v
Cyclic-redundancy
checking,
instead
of
the
usual
parity
checking,
to
significantly
improve
data
reliability
Note:
If
you
install
a
RAID
adapter,
you
can
move
the
SCSI
signal
cable
from
the
SCSI
connector
on
the
SCSI
adapter
to
an
internal
channel
connector
on
the
RAID
adapter
to
control
the
internal
drives
from
the
RAID
adapter.
SCSI
cabling
requirements:
You
can
install
five
internal
SCSI
devices
using
the
SCSI
signal
cable
that
comes
with
your
server.
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.
To
receive
an
indication
of
SCSI
hard
disk
drive
activity,
you
must
also
connect
the
SCSI
adapter
to
the
SCSI
LED
(J3)
connector
on
the
system
board.
See
“System
and
PCI
extender
board
options
connectors”
on
page
41
for
the
location
of
the
SCSI
connector.
For
information
about
the
maximum
length
of
a
SCSI
cable
between
the
terminated
ends
of
the
cable,
refer
to
the
American
National
Standards
Institute
(ANSI)
SCSI
standards.
Adhering
to
these
standards
will
help
ensure
that
your
server
operates
correctly.
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.
To
install
external
SCSI
devices,
you
must
first
install
an
optional
SCSI
PCI
adapter.
Refer
to
the
information
that
is
provided
with
the
device
for
instructions
to
set
its
SCSI
ID.
With
a
SCSI
adapter
installed
in
your
server,
you
can
use
its
68-pin
SCSI
connector
to
connect
different
types
of
SCSI
devices.
The
following
table
shows
the
pin-number
assignments
for
the
SCSI
connector.
Chapter
5.
Installing
options
85