Alpha Microsystems AM-647 Bedienerhandbuch PDF herunterladen (Seite 17)

Page A-2 Appendix A

PDI-00440-70, Rev. A01

Figure 5 shows an active external Wide SCSI connector and thumbscrews for holding the terminator in

place. This configuration is used on almost all of Alpha Micro's currently available product. The

terminator is installed by sliding it over the connector and fastening the thumbscrews to the standoffs in

the terminator.

ATTACHING EXTERNAL DEVICES

To attach an external SCSI device, you must remove the terminator from the external SCSI port.

However, you

must

make sure the SCSI bus is still terminated at both ends. To do so, install the external

active terminator in the unused SCSI I/O port of the external SCSI device.

Attaching an external narrow SCSI device, such as a CD-ROM drive, to a system using the Wide SCSI

bus is a special case. You must make sure all 16 lines of the Wide SCSI bus are properly terminated. To

do so:

1. Use an external wide to narrow SCSI cable which actively terminates the “high” nine lines of the

Wide SCSI bus. Alpha Micro offers this cable in both three foot and six foot lengths

(PDB-00440-80 and PDB-00440-81).

2. Plug a narrow active external terminator (PRA-00222-21) into the unused SCSI I/O port of the

external device. This terminates the “low” half of the SCSI bus.

Notice that, in this configuration, the Wide SCSI active external terminator (PRA-00222-20), which is

normally plugged into the external SCSI port, is not used.

TERMINATING THE INTERNAL-ONLY CABLE

The High-Capacity Wide SCSI Internal Cable (PDB-00440-75) does not attach to the external SCSI port,

and therefore cannot use an external SCSI terminator. When using this cable you must terminate the bus

by plugging a Wide SCSI device with active terminators (

not

a narrow device using an adapter) into the

last connector on the cable, and enabling termination on that device. For proper termination, the device

must be in the connector at the physical end of the cable, not just be the last device on the bus.

For a disk drive, see the drive description document (DSS-10509-xx) for how to enable termination; for a

tape drive, see the drive installation instructions (PDI-00xxx-xx).

TERMINATOR POWER

For information on how to configure terminator power, see the following documents:

• SCSI Disk Drives Installation Instructions

, PDI-00436-20, revision A12 or later.

• AM-625/626/627 SCSI 1/4" Streaming Tape Drive Installation Instructions

, PDI-00625-00,

revision A05 or later.

• AM-647 DAT Tape Drive Installation Instructions

, PDI-00647-00, revision A02 or later.

• AM-650 SCSI High-Capacity ¼” Streaming Tape Drive Installation

, PDI-00650-00.

•

The configuration document accompanying your disk drive, DSS-10509-xx.

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