IBM 704 User Manual download pdf (Page 226)

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.

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IBM 704 User Manual Page 226