Overland Data DLT LoaderXpress, Installation And User Manual, Page: 23 / 78

DLT LoaderXpress™ 2-3
I
NSTALLATION
In order to connect the module to a host computer system, the host system must have
a compatible SCSI controller and the appropriate driver software. Your Technical
Support representative is available to answer your questions about installation
procedures for specific host systems.
Before cabling the system, see the recommended SCSI cable specifications in the
following section, Also, see the section on Interface Cable and Terminator Installation
later in this chapter.
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The detailed requirements for SCSI cables are set forth in ANSI X3.131-1994. All
SCSI cables used with the DLT LoaderXpress should meet the following requirements:
•
Shielded or double-shielded, as required to meet EMI specifications
•
Impedance match with cable terminators of 132 ohms
•
Characteristic impedance between 90 and 132 ohms (required)
•
25-pair twisted-pair (LXL4105 and LXL4110) or 34-pair twisted-pair
(LXL7110)
•
Each end of twisted pair ground must be connected to chassis ground
•
The maximum cable length for a single-ended SCSI bus is 10 feet
(3 m) for all LoaderXpress models. When calculating the overall length of the
bus, be sure to include the internal cabling of the module, which is 27 inches
(0.7 m) for all models.
•
Cables of different impedances should not be used together.
Additional specifications to assure the highest SCSI performance can be found in
ANSI X3.131-1994 or later.
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KSSHUYEPMX]WLMIPHIHGEFPIW8LIYWISJYRWLMIPHIHGEFPIWTSSVUYEPMX]GEFPIWSV
SXLIVZEVMERGIWJVSQKSSHTVEGXMGIQE]VIWYPXMRRSRGSQTPMERGI[MXLREXMSREPERH
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The appropriate type of terminator is shipped with your module. It is packaged in the
accessory bag that arrives with the module. Note: It is important to use only single-
ended terminators on a single-ended SCSI bus.
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. Usually, the SCSI interface in the host computer is the first device on the
bus, so the question is whether the LoaderXpress or another device is the last device
on the bus.