Technical Specifications
B–13
Table B–14: Motherboard Jumper Settings
*
Jumper
Setting
Function
Description
J29
1 to 2
2 to 3 (D)
Disables sensing for
presence of external
cable.
Enables sensing for
the presence of an
external SCSI cable.
J29 controls the automatic SCSI bus
terminator. Disable sensing when
attaching devices that modify the
definition of the SCSI pin used for
sensing: for example, Digital
StorageWorks devices using the high-
availability storage subsystem fault
bus. When sensing is disabled, an
external terminator is always required,
even if no external SCSI device is
present.
If an external SCSI device is attached
to the SCSI connector, the automatic
SCSI terminator turns off. The SCSI
bus must be terminated at the end of
the external bus.
J30
1 to 2
2 to 3 (D)
For service use only.
This jumper is used for service only.
Do not change the setting.
*
J29 and J30 were not included on earlier shipments of the AlphaStation 255 systems.
Содержание AlphaStation 255 Series
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