24 | Cheetah 9 Installation Guide, Rev. B |
Figures 3a, 3b, 3c, and 3d show typical drive connections. The following table lists the maximum cable lengths and number of devices with single-ended I/O circuits allowed on a daisy-chain cable for 5 and 20 Mbytes/sec I/O data transfer rates.
Table 4. Cable characteristics for single-ended circuits
I/O transfer | Maximum number of | Maximum cable | ||
rate | devices on line | length allowed | ||
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5 | Mbytes/s | 8 | (reg. SCSI bus) | 6 meters (19.7 ft.) |
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5 | Mbytes/s | 16 | (wide SCSI bus) | 6 meters (19.7 ft.) |
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20 | Mbytes/s | 4 | (reg. SCSI bus) | 3 meters (9.8 ft.) |
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20 | Mbytes/s | 8 | (reg. SCSI bus) | 1.5 meters (4.9 ft.) |
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20 | Mbytes/s |
| (wide SCSI bus)1 | 1 |
1See system documentation. ANSI spec does not specify a value here.
For devices having differential I/O circuits, a maximum cable length of 25 meters (82 feet) is allowed. A maximum of 8 devices can be connected on an