2.9.5
Active/passive termination jumper block
To select active termination (the default), install a jumper on pins 1 and 2
of the active/passive termination jumper block. To select passive termi-
nation, install jumpers on pins 5 and 6 and pins 2 and 4 of the active/pas-
sive termination jumper block, and change the terminating resistor packs.
Caution. When installing jumpers on the options jumper block and the
user-configuration jumper block, be careful to install jumpers
on the correct pins. Install jumpers only on pins 1 through 4 of
the options jumper block and pins 1 through 6 of the user-con-
figuration jumper block. If you install jumpers on pin pairs that
are meant to accept only twisted pair connectors, the drive
may not function properly.
2.10 Remote LED connection
Remote LED pins are located on two separate jumper blocks: the options
jumper block and the user-configuration jumper block. Attach a two-pin
remote LED connector to either jumper block, as follows:
•
User-configuration jumper block, pins 9 and 10. Use any 2-pin, 2-mm
connector and an LED from LiteOn
, part number LTL-3231A.
•
Options jumper block, pins 7 and 8. Use any 2-pin, 0.1-inch connector
and an LED from LiteOn
, part number LTL-3231A.
2.11 External spindle synchronization option
You can synchronize the spindle motors of an array of drives by connect-
ing a twisted pair to each drive. The maximum cable length is 6 feet
(1.8 meters).
Spindle synchronization pins are located on two separate jumper blocks:
the options jumper block and the user-configuration jumper block. Use
either jumper block to synchronize an array of drives, as follows:
•
User-configuration jumper block. Use one strand of the twisted pair
to connect together pin 7 of the user-configuration jumper block of
each drive. Use the other strand to connect together pin 8 of the
user-configuration jumper block of each drive.
•
Options jumper block. Use one strand of the twisted pair to connect
together pin 5 of the options jumper block of each drive. Use the other
strand to connect together pin 6 of the options jumper block of each
drive.
26
ST3655 Family SCSI Drives Product Manual, Rev. A
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