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Adaptec SCSI Card 39160 User’s Reference

The following example shows LVD (Ultra160 and Ultra2) SCSI

devices on Channel B and non-LVD SCSI devices on Channel 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
Cable Length Data Transfer Rate Maximum Devices
Supported
25 m (82.0 ft) Ultra160 SCSI (160 MBytes/sec)
and Ultra2 SCSI (80MBytes/sec) 1
12 m (39.4 ft) Ultra160 SCSI (160 MBytes/sec)1
and Ultra2 SCSI (80 MBytes/sec)
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.
15
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 (40 MBytes/sec for 16-
bit, 20 MBytes/sec for 8-bit) 4
1.5 m (4.9 ft) Ultra SCSI (40 MBytes/sec for
16-bit, 20 MBytes/sec for 8-bit) 5-72
2 Ultra SCSI data transfer rates do not currently support more than seven devices
connected to the SCSI card.
Ultra160 and Ultra2
SCSI devices Non-LVD
SCSI devices
Terminated
devices
Built-in
terminator
T
T
T
T
Terminated
devices
Terminated
device