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J2, J3, J5, and J7 Termination Enable

J2, J3, J5, and J7 are 3-pin connectors that set the SCSI termination for each SCSI channel. The Dell default is termination always enabled (OPEN.) Table 10-2 displays the pinout.

Ta b l e 1 0 - 2 . J2 , J 3 , J 5 a n d J 7 Te r m i n at i on E na b l e P i n o u t

Jumper

SCSI

SCSI

SCSI

SCSI

 

Channel

Termination

Termination

Termination

 

 

Controlled by

Always

Always Enabled

 

 

Software

Disabled

 

 

 

 

 

 

J2

0

Short pins 1-2

Short pins 2-3

OPEN (default)

 

 

 

 

 

J3

1

Short pins 1-2

Short pins 2-3

OPEN (default)

 

 

 

 

 

J5

2

Short pins 1-2

Short pins 2-3

OPEN (default)

 

 

 

 

 

J7

3

Short pins 1-2

Short pins 2-3

OPEN (default)

 

 

 

 

 

J9, J10, J11, and J12 TERMPWR Enable

J9, J10, J11, and J12 are 2-pin connectors that enable TERMPWR to the SCSI bus for each SCSI channel. The default is pins 1 and 2 shorted. Table 10-3 displays the pinout.

Ta b l e 1 0 - 3 . J9 , J 1 0 , J 11 a n d J1 2 T E R M P W R E n a b l e P i n ou t

Jumper

Term.

Settings

 

Power

 

 

Channel

 

 

 

 

J9

0

Short pins 1-2 to have the host PCI bus provide

 

 

TermPWR. This is the factory setting. Leave open to let

 

 

the SCSI bus provide TermPWR.

 

 

 

J10

1

Short pins 1-2 to have the host PCI bus provide

 

 

TermPWR. This is the factory setting. Leave open to let

 

 

the SCSI bus provide TermPWR.

 

 

 

J11

2

Short pins 1-2 to have the host PCI bus provide

 

 

TermPWR. This is the factory setting. Leave open to let

 

 

the SCSI bus provide TermPWR.

 

 

 

J12

3

Short pins 1-2 to have the host PCI bus provide

 

 

TermPWR. This is the factory setting. Leave open to let

 

 

the SCSI bus provide TermPWR.

 

 

 

138

PERC 3/QC Hardware Installation

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Dell J2, J3, J5, and J7 Termination Enable, J9, J10, J11, and J12 Termpwr Enable, Jumper Term Settings Power Channel