Q-Logic QLA12160 manual Scsi Problem Checklist, Maximum Cable Length

SCSI Problem Checklist 3 – Troubleshooting

3.4

SCSI Problem Checklist

■Is the SCSI bus termination for the QLA12160 board set correctly (see appendixes A and B)?

■Is the termination for all devices on the SCSI bus set correctly?

■Were all SCSI devices powered up before you powered up the PC?

■Does each device have a unique SCSI ID? Each device must have a unique ID between 0 and 15. The QLA12160 board is set to SCSI ID 7 at the factory.

■Are the cable lengths within limits? Be sure that the total length for cables connected to the QLA12160 board does not exceed the length listed in table 3-1.

Table 3-1. Maximum Cable Length

Board and Mode	Cable Length
QLA12160
point-to-point	82 feet (25 meters)
15 nodes	39 feet (12 meters)
single-ended Ultra mode	9.8 feet (3 meters)a
	4.9 feet (1.5 meters)b

Table Notes

If you are mixing Ultra and non-Ultra SCSI devices, the total cable length cannot exceed the maximum cable length established for Ultra SCSI devices.

aFor four or fewer devices connected to the board. bFor up to six devices connected to the board.

3-2 DC8151101-00 B