Jumper Settings; Settings For Jumpers J3 And J4 - Acer Altos 19000PRO4 System Manual

3.4.3

Jumper Settings

The backplane has two jumpers, J3 and J4, that allow you to select
the terminator power source. J4 supports the three upper drive slots
(slots 1, 2, and 3) on the backplane. J3 supports the four lower drive
slots (slots 4, 5, 6, and 7).
Figure 3-34 shows the settings for jumpers J3 and J4.
Figure 3-34

Settings for Jumpers J3 and J4

You may also set J3 to setting 1 and J4 to
setting 2, or vice versa.
For single-channel configuration, settings 1
and 2 for J3 are disabled since terminators
RA4, RA5, and RA6 are removed.
System Configuration
Terminator power comes from the
SCSI cable (P2)
Terminator power comes from the
backplane (P1)
* Default setting
3-43