First Virtual Communications 3000 user manual Cabling and Termination Issues, Off

Voyager 3000 User Guide

Table 2-1 SCSI ID switch settings for the second backplane in a VRA-3002 configuration.

DPS1 Sw1	DPS1 Sw2	DPS1 Sw3	DPS1 Sw4	Bay 0 Device SCSI ID
(ID Bit0)	(ID Bit1)	(ID Bit2)	(ID Bit3)
Off	Off	Off	Off	0
On	Off	Off	Off	1
Off	On	Off	Off	2

On	On	Off	Off	3
Off	Off	On	Off	4
On	Off	On	Off	5
Off	On	On	Off	6
On	On	On	Off	7
Off	Off	Off	On	8
On	Off	Off	On	9
Off	On	Off	On	10
On	On	Off	On	11
Off	Off	On	On	12
On	Off	On	On	13
Off	On	On	On	14
On	On	On	On	15

DPS1 Sw5	DPS1 Sw6	DPS1 Sw7	DPS1 Sw8	Bay 4 Device SCSI ID
(ID Bit0)	(ID Bit1)	(ID Bit2)	(ID Bit3)
Off	Off	Off	Off	0
On	Off	Off	Off	1
Off	On	Off	Off	2

On	On	Off	Off	3
Off	Off	On	Off	4
On	Off	On	Off	5
Off	On	On	Off	6
On	On	On	Off	7
Off	Off	Off	On	8
On	Off	Off	On	9
Off	On	Off	On	10
On	On	Off	On	11
Off	Off	On	On	12
On	Off	On	On	13
Off	On	On	On	14
On	On	On	On	15

Cabling and Termination Issues

SCSI requires that cable lengths be no greater than 6 metres at 5MHz clock rates and no greater than 3 metres at 10MHz clock rates when used in SCSI -2 single ended mode. Differential mode allows cable lengths of up to 25 metres. See the note below for Ultra SCSI. This is summarised in Table 2-2.

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