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30 Appendix
Appendix A
Maximum Cable Lengths
The total length of cabling (internal and external) on the SCSI bus cannot exceed
the maximum lengths listed in the following table. The third column lists the
maximum number of SCSI devices you can connect to the SCSI card.
Maximum
Maximum Devices
Cable Length Data Transfer Rate Supported
25 m (82.0 ft) Ultra160 SCSI (160 MBytes/sec) 1
and Ultra2 SCSI (80 MBytes/sec)
12 m (39.4 ft) Ultra160 SCSI (160 MBytes/sec)
1
15
and Ultra2 SCSI (80 MBytes/sec)
3 m (9.8 ft) Fast Wide SCSI (20 MBytes/sec) 15
3 m (9.8 ft) Fast SCSI (10 MBytes/sec) 7
3 m (9.8 ft) Ultra SCSI 4
(40 MBytes/sec for 16-bit,
20 MBytes/sec for 8-bit)
1.5 m (4.9 ft) Ultra SCSI 5-7
2
(40 MBytes/sec for 16-bit,
20 MBytes/sec for 8-bit)
1
Mixing Fast/Ultra devices with Ultra160 and Ultra2 SCSI devices causes the entire SCSI bus to default to Ultra SCSI
speeds and cable length requirements.
2
Ultra SCSI data transfer rates do not currently support more than seven devices connected to the SCSI card.