Installing System Options
3-12 AlphaStation 500 Series User Information
________________________ CAUTION __________________________
Failure to properly set up the SCSI termination may result in loss of data or
damage to the file system.
___________________________________________________________
SCSI Termination
The AlphaStation 500 Series system contains an embedded SCSI bus that is used to
connect both the internal and external drives. Both ends (and only at the ends) of the SCSI
but MUST be terminated correctly.
External SCSI Connector Termination
An external terminator is required when the SCSI port is not being used.
Internal SCSI Termination
The internal SCSI cable used for the AlphaStation 500 Series is a flat ribbon cable with
integrated termination. Therefore, NO storage devices should have termination enabled.
SCSI Bus Length
The total SCSI bus length, including internal cables and etch on the motherboard as well
as the external cables between storage between the storage enclosures and the must not
exceed 3 meters (9.8 feet) for fast SCSI operation or 4 meters (13.1) feet for slow SCSI
(5MB/second). The AlphaStation 500 Series system’s internal SCSI length is 1.2 meters
(3.9 feet), leaving 1.8 meters (5.9 feet) available for fast SCSI use (2.8 meters [9.2 feet] for
external slow SCSI use).
