Alpha Microsystems AM-649 Manual de Instruções descarregar pdf (Página 9)

Page 6 Installation Instructions: AM-65X 1/4" Streaming Tape Drive

PDI-00651-00, Rev. A01

TERMINATION POWER

To control SCSI bus termination properly, a termination power source must be provided; this is

especially important when using an external terminator.

Why is Termination Power so important when using an external terminator?

Any terminator must have a power source. Because an external terminator does not have its own source

of power, it must get its termination power from the SCSI bus. If termination power is not available on

the bus, the external terminator cannot do its job, which means your SCSI bus will not be terminated

properly. This may result in a computer that won't boot, or that "hangs" frequently. As mentioned above,

the AM-65X is more sensitive to improper termination than were older tape drives.

All AMOS computers using the SCSI-2 or Wide SCSI-2 bus should be configured to supply termination

power via the host controller. When SCSI bus termination power is supplied by the host controller, no

SCSI peripheral should supply termination power to the bus.

SCSI subsystems attached to the main system should not have any additional devices supplying

termination power to the SCSI bus. Termination power should be supplied by the SCSI controller only!

For information on how to configure terminator power on SCSI hard disks and other magnetic tape

peripherals, see the following documents:

•

AM-62X SCSI 1/4" Streaming Tape Drive Installation Instructions, PDI-00625-00, revision A07

or later.

•

AM-647, 648, and 649 Digital Audio Tape (DAT) High Capacity Tape Drive Installation

Instructions, Rev. A01 or later.

INSTALLING THE AM-65X

The following sections explain how to install the SCSI streamer and cable it to your computer, based on

the type of computer you have. Find the heading for your computer chassis and follow the instructions.

Follow the instructions in your computer Owner's Manual for turning off the power to each component.

Be sure to observe the cautions concerning electrostatic discharges and grounding.

Old Style Pedestal and Rack Mount Computer Installation

The following sections describe how to install the tape drive into pedestal and rack mount AMOS

computers. The basic installation procedure is the same for both types.

FRONT BEZEL MODIFICATION

If you are replacing an existing tape drive, your bezel has already been modified. You can skip this

step.

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Alpha Microsystems AM-649 Manual de Instruções Página 9