IntraServer Technology ITI-90-100250 - Manual (Page 25)

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LVD signal levels. The LVD light will light to indicate the bus
is running in ULTRA2 LVD (80MB/sec) mode.
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If the LVD/SE bus on an ITI-8000 Series module senses ANY
Single Ended (SE Only) devices on the bus, it will
automatically set to SE signal levels and run in ULTRA
(40MB/sec) mode.
NOTE: Placing Single Ended devices on the LVD bus on a ITI-8000
Series adapter will force the LVD bus to run in ULTRA mode.
QUICK CHECK: If the LVD LED (see Figure 1) is ON, the bus is
capable of Ultra2 (80MB/sec) performance. If the
LED is OFF the bus is capable of 40MB/sec.
As a rule, SE devices and LVD devices should NOT be mixed on a bus. If all
SE devices are kept on one SE bus, the LVD bus will run at Ultra2 speeds,
while the SE devices will run at their maximum Ultra performance.
If a “Y” cable is used on the FRONT external connector, placing the ITI-
8000 Series adapter in the middle of the LVD SCSI bus, you must install a
jumper on the invert termination headers HDR1 and HDR3 (see Figure 2),
this will force the module NOT to terminate the bus. This situation could
arise in a SCSI cluster.
If a “Y” cable is used on the REAR external connector, placing the ITI-8000
Series adapter in the middle of the LVD SCSI bus, you must install a jumper
on the invert termination headers HDR6 and HDR7 (see Figure 2), this will
force the module NOT to terminate the bus. This situation could arise in a
SCSI cluster.
QUICK CHECK: If the TERM LED (see Figure 1) is ON the ITI-8000
Series adapter is terminating the bus. If you are using the
“Y” configuration as described above, the termination
LED must be OFF.
LVD technology is not compatible with the older High Voltage Differential
SCSI standard. If an HVD device is placed on the Ultra2/LVD bus, the
IntraServer host adapter will turn off the port, and indicate the error by
flashing the LVD LED Status Indicator. Do not use HVD terminators on
your LVD bus.
QUICK CHECK: If the LVD LED is Flashing, a HVD device has been
sensed on the LVD bus, and the bus has been disabled.
Remove the HVD device.