Black Box SC120A-R2 User Manual download pdf (Page 23)

2 X 2 SCSI MATRIX SWITCH

5. Configuration and Operation

5.1 SCSI Cable Interface Requirements

The 2 x 2 SCSI Matrix Switch can be installed at any point on the SCSI bus. Always

use high-quality cables for optimum computer performance and reliability.

The SC121A differential switch contains 68-pin high-density connectors for up

to 80-MB-per-second wide Ultra SCSI and Ultra2 SCSI computers and peripherals.

The maximum cable distance should not exceed 82 ft. (25 m).

The SC120A-R2 single-ended/low-voltage differential switch contains 68-pin

high-density connectors for up to 160-MB-per-second wide Ultra SCSI, Ultra2 SCSI,

and Ultra160 SCSI computers and peripherals:

• Low-Voltage Differential (LVD):

When operating with LVD devices, the SC120A-R2 supports 160-MBps wide

Ultra160 SCSI computers and peripherals. The

maximum cable distance for

LVD should not exceed 82 ft. (25 m) total length.

• Single-Ended (SE):

When operating with SE devices, the SC120A-R2 supports 40-MBps wide Ultra

SCSI computers and peripherals. The maximum cable distance for SE should

not exceed 20 ft. (6 m) total length.

Black Box offers standard and custom SCSI cables for connecting the SCSI

Switch to host devices and peripherals. Call Black Box Technical Support for

details.

5.2 Internal Terminator Selection

The SCSI Switch contains internal SCSI-bus terminators for each port.

Termination is required at both ends of a SCSI bus for proper operation. Each

port can have its internal terminator enabled or disabled from the front-panel

display and keypad.

Refer to Figure 5-4 to select internal termination.

NOTE

Data errors will result if more than two sets of terminators are installed

on any SCSI bus (see Figures 2-1 and 2-2).

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Black Box SC120A-R2 User Manual Page 23