First Virtual Communications 3000 Network Router User Manual


 
Voyager 3000 User Guide
2-8
Table 2-1 SCSI ID switch settings for the second backplane in a VRA-3002 configuration.
DPS1 Sw1
(ID Bit0)
DPS1 Sw2
(ID Bit1)
DPS1 Sw3
(ID Bit2)
DPS1 Sw4
(ID Bit3)
Bay 0 Device SCSI ID
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
(ID Bit0)
DPS1 Sw6
(ID Bit1)
DPS1 Sw7
(ID Bit2)
DPS1 Sw8
(ID Bit3)
Bay 4 Device SCSI ID
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.