Cabling and termination issues – First Virtual Communications Voyager 3000 User Manual
Page 28
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.