Quantum 10K II - Manual (Page 42)

Installation
Quantum Atlas 10K II Ultra 160/m SCSI Hard Disk Drives 3 − 15
3.4.2.5 Force Single-Ended Operation for SCA-2 Connector Versions
A jumper is provided to force the disk drive to operate as a single-ended device. See
the explanation of the LVD SCSI interface in Chapter 7 for details.
To force the disk drive to operate as a single-ended device, install the low profile
jumper across pin pair 1 / 3 (Figure 3-6). For LVD operation and monitoring of
DIFFSENS signal, place the jumper across pin pair 2 / 4.
Figure 3-6 Force Single-Ended Operation Jumper Locations
Force single-ended jumper shown
installed across Pin Pair 1 / 3. This forces
the disk to operate as a single-ended
device and disables its ability to monitor
DIFFSENS.
Remove the jumper or park it across Pin
Pair 2 / 4 to enable the disk drive’s
DIFFSENS monitoring feature, required for
LVD SCSI.
Pin 2 Pin 1
Pin 3 Pin 4