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TL891 MiniLibrary System User's Guide
Compaq Confidential – Need to Know Required
Writer: Everett Godaire Project: TL891 MiniLibrary System User's Guide Comments:
Part Number: ER-TL891-UA.A01 File Name: d-ch3 Installation Last Saved On: 3/2/99 2:30 PM
Additional specifications to assure the highest SCSI performance can be found
in ANSI X3.131-1994 or later.
NOTE:
This equipment has been tested for electromagnetic emissions and immunity
using good quality shielded cables. The use of unshielded cables, poor quality cables or
other variances from good practice may result in non-compliance with national and
international rules.
Terminators
A terminator must be installed on the device if the device is to be used at either
end of a SCSI bus, such as the first or last device along a daisy-chain, or as a
single SCSI peripheral. The appropriate type and quantity of terminator is
shipped with your module. They are packaged in the accessory bag that arrives
with the module.
NOTE:
It is important to use only differential terminators on a differential SCSI bus.
Interface Cable and Terminator Installation
To properly cable a module:
1.
Make sure that your host system has an appropriate SCSI interface card
for each SCSI bus and software drivers installed.
2.
Inspect the terminator and make sure it is a differential type. SCSI
terminators should be clearly marked ‘single-ended’ or ‘differential’.
3.
Determine whether the module is to be connected in daisy-chain fashion
with other devices.
4.
If not used in a daisy-chain, install the terminator in the second SCSI
connector.
5.
If used in a daisy-chain, and the drive is the last device of the chain,
install the terminator in the second SCSI connector. Otherwise, do not
use the terminator. Connect the next cable in the chain to the second
SCSI connector.
6.
Make sure that the cable you use meets the specifications listed earlier
in this chapter.
7.
Measure the cable length to connect the module to the computer system.
8.
Be sure that the length of the entire bus falls below the maximum
permissible length given in the section entitled Interface Cable
Specifications.
