2-14Adaptec Ultra320 SCSI Cards User’s GuideMaximum Cable LengthsThe total length of cabling (internal and external) on the SCSI buscannot exceed the maximum lengths listed in the following table.The third column lists the maximum number of SCSI devices youcan connect to the SCSI card.MaximumCable Length Data Transfer RateMaximum DevicesSupported25 m (82.0 ft) Ultra320 SCSI (320 MB/sec)Ultra160 SCSI (160 MB/sec)Ultra2 SCSI (80 MB/sec)112 m (39.4 ft) Ultra320 SCSI (320 MB/sec) 1Ultra160 SCSI (160 MB/sec)Ultra2 SCSI (80 MB/sec)1 Mixing Fast/Ultra devices with Ultra320/Ultra160 and Ultra2 SCSI devices causesthe entire SCSI bus to default to Ultra SCSI speeds and cable length requirements.153 m (9.8 ft) Fast Wide SCSI (20 MB/sec) 153 m (9.8 ft) Fast SCSI (10 MB/sec) 73 m (9.8 ft) Ultra SCSI (40 MB/sec for 16-bit,20 MB/sec for 8-bit)41.5 m (4.9 ft) Ultra SCSI (40 MB/sec for 16-bit,20 MB/sec for 8-bit) 5-7 22 Ultra SCSI data transfer rates do not currently support more than seven devicesconnected to the SCSI card due to cable lengths.
