Adaptec 1863700 User Reference - Page 29

Connecting SCSI Devices 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: Maximum Cable Length Data Transfer Rate Maximum Devices Supported 25 m (82 ft) Ultra160 SCSI (160 MBytes/sec) 1 Ultra2 SCSI (80 MByte/sec) 12 m (39.4 ft) Ultra160 SCSI (160 MBytes/sec)1 15 Ultra2 SCSI (80 MByte/sec) 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 5-72 (40 MBytes/sec for 16-bit, 20 MBytes/sec for 8-bit) 1 Mixing Fast/Ultra devices with Ultra160 SCSI devices causes the entire SCSI bus to default to Ultra SCSI speeds and cable requirements. 2 Ultra SCSI data transfer rates do not currently support more than eight devices. 23