Seagate ST34501N ユーザーズマニュアル
24
Cheetah 4LP 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.
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.
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.
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
rate
Maximum number of
devices on line
devices on line
Maximum cable
length allowed
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)