SGI Octane III Specifications Page 211

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Installing External SCSI Devices
189
About Cables
You can attach one or more external devices to the SCSI port on the back of your
workstation. Connecting more than one device is called daisy-chaining. The devices are
connected in a chain, with the first device attached to the SCSI port on the workstation.
The combined length of SCSI cables determines the number of devices that can be
daisy-chained. See Table 6-3 for informationon thetypes of devices and combinedcable
lengths you may use.
Caution: Using a cable without controlled impedance may cause your device to not
function. For any external device, it is extremely important that you use a cable of
controlledimpedance, and with impedance-matched connectors. Notall cableswith the
correctconnectorwork.Thisisparticularlyimportantifyouhavemorethanoneexternal
device.
Use the cables and active terminator that came with the wide device, or purchase an
active terminator, if necessary. Use only an active terminator.
Caution: Using other types of cables or terminators can result in your system
malfunctioning.
If you have a device that you want to attach to your system, but you do not have the
appropriate cables, you can order them by contacting your authorized service provider.
Toattachanexternaldevice,power offtheOCTANE workstation andpreparethe device
for installation. Instructions begin in the next section.
Table 6-3 Maximum Combined SCSI Cable Length For Daisy-Chaining Devices
SCSI type Maximum cable length:
Ultra SCSI 1.5 meters
Fast SCSI 2 3 meters
Ultra SCSI and Fast SCSI 2 1.5 meters
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