Seagate ST3655N - Manual (Page 6)

4. Installing jumpers on the active/passive termination
jumper block. If you removed the terminating resistors from
the drive according to the instructions in step 2, skip this step.
If you are either:
•
using Fast SCSI transfer rates, or
•
not using Fast SCSI transfer rates, and both ends of the I/O
cable are terminated by resistors of equal value,
use active termination by installing a jumper on pins 1 and 2
of the active/passive termination jumper block, as specified in
the following table.
Fast SCSI SCSI
Termination Active Active or passive
Terminator
specification 110 ohms 110 ohms or
220/330 ohms
Install active/passive
termination jumpers Pins 1 and 2 Pins 1 and 2
or
Pins 2 and 4
Pins 5 and 6
If the host adapter contains 220/330-ohm resistors that cannot
be removed and replaced with 110-ohm resistors, set the drive
termination power to 220/330 ohms. Remove the jumper from
pins 1 and 2 and install jumpers on pins 2 and 4 and pins 5
and 6 of the active/passive termination jumper block. Then,
replace the 110-ohm terminators provided with the drive with
220/330-ohm terminators.
4 ST3390N, ST3655N Installation Guide, Rev. A