Avago Technologies LSI21040 - Manual (Page 25)

3.75 pc 10.25 pc 11.25 pc 38.25 pc
4.333 pc
48.583 pc
52.5 pc
34.5 pc
44.25 pc
Detailed Installation Procedure 2-7
You can connect up to four devices if they are evenly spaced on a
3-meter Ultra SCSI cable (0.75 m between devices). Your SE SCSI bus
should not exceed 3 meters (total internal and external cable lengths),
even with fewer than four devices.
For LVD applications, you can connect up to 16 devices including the
host adapter if they are evenly spaced on a 12-meter Ultra SCSI cable
(0.19 m minimum between devices).
Table 2.2 provides a list of the
maximum bus lengths and the maximum number of devices for various
SCSI definitions.
Table 2.2 SCSI Bus Lengths
Maximum Bus Length, Meters
1
1. This parameter may be exceeded in point-to-point and engineered
applications.
SE Differential LVD
Maximum #
of Devices
SCSI-1 6 25 12 8
Fast SCSI 3 25 12 8
Fast Wide SCSI 3 25 12 16
Ultra SCSI 1.5
2
2. Additional spacing rules apply.
25 12 8
Ultra SCSI 3
2
– – 4
Wide Ultra SCSI – 25 12 16
Wide Ultra SCSI 1.5 – – 8
Wide Ultra SCSI 3 – – 4
Ultra2 SCSI Note
3
3. SE and high power differential are not defined at Ultra2 or Ultra160 speeds.
Note
3
12 8
Wide Ultra2 SCSI Note
3
Note
3
12 16
Ultra160 SCSI Note
3
Note
3
12 16