Installing the A6828A Adapter

Specifying SCSI Parameters

Table 2-4

Summary of A6828A Auto Termination Configurations

Auto Termination

Termination

Jumper PositionApplied on

Feature

Adapter

1An external terminator might be required on the adapter, depending on the SCSI bus configuration. If you need an external terminator for the A6828A, use SCSI LVD/SE terminator (HP product number C2370A).

Using the Jumper for Controlling Auto Termination

The A6828A adapter has one set of pins that control enabling and disabling of the auto termination feature. The pins—labeled A_TERM —are at the end of the HBA that is opposite to the bulkhead connectors. Figure 1-1 on page 20 shows where the pin set is located on the adapter.

The default setting of the pin set on the A6828A HBA is the open position (the jumper is on only one pin of its pin set). This is the auto termination enabled state. In this state, the A6828A automatically senses whether a cable from a powered SCSI device is attached and provides the proper termination (depending on whether a powered device is present).

To disable auto termination on the adapter, change the jumper from the default open position to the shorted position (the jumper is on both pins of the pin set). This is the auto termination disabled state.

The following Figure 2-2 shows the two jumper positions.

Figure 2-2

Auto Termination Jumper Positions

 

 

 

 

 

 

 

 

Open

Shorted

 

(Auto termination enabled)

(Auto termination disabled)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

38

Chapter 2