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Connecting External Options
Cabling Requirements
A 16-bit (wide) SCSI cable connects each hot-swap backplane to an
integrated SCSI-2 controller on the system board; and an 8-bit SCSI
cable connects the CD-ROM drive to the 8-bit connector on the top
backplane. The 8-bit cable connected to the CD-ROM drive has two
empty connectors that you can use to support additional 8-bit SCSI
devices in the upper-left front bays.
If you plan to install external SCSI devices, you must order an
additional SCSI cable and a SCSI-2 adapter. That is, to use external
devices, you must connect them to an optional SCSI-2 adapter, using
a SCSI cable.
Each SCSI-2 integrated controller can support a total of 14 devices,
provided that you do not exceed the maximum cable lengths. Refer
to your RAID adapter documentation to determine the number of
internal and external connectors, channels, and SCSI devices that
your RAID adapter supports.
If you are using a SCSI data transfer rate greater than 5 MB per
second, the maximum length of the SCSI bus (cable) must not
exceed 3 meters (9.8 feet). If you are using a SCSI data transfer rate
of 5 MB per second or slower, the maximum length of the SCSI bus
cable must not exceed 6 meters (19.7 feet). These lengths apply to
the combined lengths of the internal and external cables. Adhering
to these standards ensures that your server operates properly.
Before you install external SCSI devices, you must have the correct
external SCSI cables. The cables must have the proper connector for
the SCSI-2 adapter on one end, and the proper connector for the
first external device on the other end. To select and order the
correct cables for use with external devices, contact your IBM
reseller or IBM marketing representative.
208 PC Server 704 User's Handbook