Figure 6-5 Comparing Speed Of Daisy-Chained Devices - Silicon Graphics Octane2 Owner's Manual

Chapter 6: Installing and Removing External Devices
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3. Use the following cables between your workstation and the SCSI device, or between
devices:
To connect the device directly to your workstation's SCSI port, use the
high-density 68-pin to Centronics® 50-pin Fast SCSI cable. See Figure 6-5.
To daisy-chain an Ultra SCSI device to another Ultra SCSI device, use a 68-pin
to 68-pin cable.
To daisy-chain an Ultra SCSI device to a Fast SCSI device, use a 68-pin to 50-pin
Centronics Fast SCSI cable.
OCTANE2
8-bit Fast SCSI-2 device
10 MB/sec
or or
16-bit Ultra SCSI device
40 MB/sec
16-bit Ultra SCSI device
40 MB/sec
Figure 6-5 Comparing Speed of Daisy-Chained Devices
The speed of the active SCSI device determines the speed of any other devices in a daisy
chain. If a slow device is active, the SCSI bus runs at a slow speed; if a high-speed device
is active, the SCSI bus runs at a high speed.
8-bit Fast SCSI-2 device
10 MB/sec
Speed = 10 MB/sec
16-bit Ultra SCSI device
40 MB/sec
Speed = 40 MB/sec
8-bit Fast SCSI-2 device
10 MB/sec
Speed = 10 MB/sec
(8-bit device active)
= 40 MB/sec
(16-bit device
active)