Black Box SC120A-R2 User Manual download pdf (Page 13)

2 X 2 SCSI MATRIX SWITCH

2.3.2 G

ENERAL

ARDWARE

ESCRIPTION

The 2 x 2 SCSI Matrix Switch’s rear panel identifies each of the independent SCSI

ports. SCSI ports A and B have two daisychained connectors per port and SCSI

ports 1 and 2 have single connectors for installation of SCSI devices. You can install

the SCSI Switch at any point on the SCSI bus.

Each port has internal termination that can be turned on or off from the LCD

panel. External “terminator power” (TERMPWR) for devices and terminators are

provided by internal resettable fuses.

The SCSI Switch does not require a device ID and is completely transparent to

all computers and peripherals on the SCSI bus. No additional software is needed

for installation and operation. A universal switching power supply automatically

adapts to input voltages between 95 VAC and 260 VAC.

2.3.3 U

LTRA

2 SCSI C

OMPATIBILITY

The SCSI Switch supports Ultra2 SCSI, 80-MBps (wide) SCSI host adapters,

computers, and peripherals in asynchronous and synchronous mode. (SC120A-R2

also supports Ultra160 SCSI, 160-MBps devices.) The SCSI Switch conforms to

ANSI X3.131 and X3T9.2 specifications for single-ended devices. Disconnect and

reselect functions are fully supported to ensure complete SCSI compatibility.

2.3.4 SCSI S

WITCH

NSTALLATION

Ports A and B are fully bidirectional to ports 1 and 2 (see Figures 2-1 through 2-3).

You determine where to connect computers, host adapters, and peripherals. In

general, if daisychained ports are required for connection to external peripherals,

use ports A or B.

The LCD panel is used to select port connections and enable or disable each

internal SCSI port terminator. Refer to Chapter 4 for complete instructions on

operating the LCD keypad.

You can selectively enable or disable any internal terminator to meet system

configurations and requirements.

NOTES

1. For proper operation of any SCSI bus, there must not be a “hanging”

line or cable. Termination should be enabled on active SCSI ports that

are not connected through to another port.

2. Connections can be made to either connector on the appropriate port.

3. In Figures 2-1 and 2-3, “Term” shows where terminators should be

installed.

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Black Box SC120A-R2 User Manual Page 13

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