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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.
1
See 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 8-bit wide data bus, and a maximum of
16 devices can be connected on a 16-bit wide data bus.
Table 4. Cable characteristics for single-ended circuits
I/O transfer
rate
Maximum number of
devices on line
Maximum cable
length allowed
5 Mbytes/s 8 (reg. SCSI bus) 6 meters (19.7 ft.)
5 Mbytes/s 16 (wide SCSI bus) 6 meters (19.7 ft.)
20 Mbytes/s 4 (reg. SCSI bus) 3 meters (9.8 ft.)
20 Mbytes/s 8 (reg. SCSI bus) 1.5 meters (4.9 ft.)
20 Mbytes/s (wide SCSI bus)
11