Black Box ACI-2000A Manuale utente

CUSTOMER

SUPPORT

INFORMATION

Call our Technical Support Specialists to discuss your application.

For 24-hour technical support: Call (412) 746-5500 or Fax: 1-800-321-0746

To order: Call (412) 746-5500 8:00 A.M. to 8:00 P.M. EST

Mail order: Black Box Corporation, P.O. Box 12800, Pittsburgh, PA 15241

Black Box Corporation

The Source for Connectivity

JUNE 1996

IC495A-R2

SCSI Fiber Optic Extender

LINK ACTIVE

BUS ACTIVE

LINK ERROR

POWER

SCSI FIBER OPTIC EXTENDER

SCSI Fiber Optic Extender

FEDERAL COMMUNICATIONS COMMISSION

RADIO FREQUENCY INTERFERENCE STATEMENT

This equipment generates, uses, and can radiate radio frequency energy

and if not installed and used properly, that is, in strict accordance with the

manufacturer’s instructions, may cause interference to radio

communication. It has been tested and found to comply with the limits for a

Class A computing device in accordance with the specifications in Subpart B

of Part 15 of FCC Rules, which are designed to provide reasonable

protection against such interference when the equipment is operated in a

commercial environment. Operation of this equipment in a residential area

is likely to cause interference, in which case the user at his own expense will

be required to take whatever measures may be required to correct the

interference.

Changes or modifications not expressly approved by the party responsible

for compliance could void the user’s authority to operate the equipment.

“This digital apparatus does not exceed the Class A limits for radio noise

emission from digital apparatus set out in the Radio Interference

Regulation of the Canadian Department of Communications.”

“Le présent appareil numérique n’émet pas de bruits radioélectriques

dépassant les limites applicables aux appareils numériques de la classe A

prescrites dans le Règlement sur le brouillage radioélectrique édicté par le

ministère des Communications du Canada.”

TRADEMARKS

All applied-for and registered trademarks are the property of their

respective owners.

ST®is a registered trademark of American Telephone and Telegraph

Company.

CHAPTER 1: Specifications

FIBEROPTIC INTERFACE

Maximum Cable Length —

Up to 3000 ft. (about 1 km) of duplex

fiberoptic cable between a matched pair of extenders

Recommended Fiberoptic Cable —

62.5/125 µm, 100/140 µm, or 50/125 µm

Serial Data Rate —

175 MHz

Optical Wavelength —

830 nm

Typical Bit Error Rate (BER) —

10-12

SCSI INTERFACE

Maximum SCSI Cable Length —

19.7 ft. (6 m)

Maximum Speed —

10 megabytes per second

Slew Rate —

5 ns (maximum)

Protocol —

Sync or async

Standards —

ANSI X3.131 and X3T9.2

Interface —

Compatible with SCSI I and SCSI II

SCSI to Fiber Conversion Delay —

200 ns

Termination —

Active Internal Bus

PHYSICAL

Indicators —

(4) LEDs: Line Active, Bus Active, Line Error, Power

Connectors —

(2) fiber ST, (1) 50-pin SCSI, (1) IEC (power)

Power —

110/220 VAC ±10%, 65/45 Hz (switch-selectable), 7 watts

Size —

2.1"H x 6"W x 9.6"D (5.3 x 15.2 x 24.4 cm)

Weight —

3 lb. (1.4 kg)

1. Specifications

SCSI Fiber Optic Extender

2.1 Overview

The SCSI bus (pronounced

scuzzy

) is one of the most popular interfaces for

connecting peripheral devices to a computer system. However, the

maximum allowable cable distance from computer to SCSI peripheral is just

19.7 ft. (6 m). But by using a pair of SCSI Fiber Optic Extenders, you can

far exceed that distance.

Now you can connect SCSI components such as disk drives, CD-ROM

systems, RAID arrays, tape backup drives, and laser printers up to 3000 feet

(about 1 km) from the host computer, via fiberoptic cable (see Figure 2-1).

Figure 2-1. Sample Application Using SCSI Fiber Optic Extenders.

Note the location of the SCSI terminators.

SCSI Fiber Optic Extender supports a maximum SCSI data rate of 10

MBytes per second in asynchronous or synchronous mode. It supports the

“Fast SCSI” standard, available in top-of-the-line computers and

peripherals. And proprietary switching enables the Extender to maintain

complete SCSI command functionality and remain transparent to the user.

The Extender conforms to ANSI X3.131 and X3T9.2 specifications with

single-ended device termination. Disconnect and Reselect are fully

supported to ensure complete SCSI compatibility. Also, the Extender does

not require a SCSI device address.

Besides extending a single SCSI chain, you can use a pair of these

Extenders to link two remote SCSI chains (see Figure 2-2), enabling

computer users in distant workgroups to share multiple SCSI peripherals.

2. Introduction

SCSI

Terminators

SCSI

Terminators

Host

Computer

SCSI

Peripherals

SCSI Fiber Optic Extenders

Linked Via Duplex

Fiberoptic Cable—

Up To 3000 feet (1 Km)

CHAPTER 2: Introduction

Figure 2-2. Sample Application Using SCSI Fiber Optic Extenders.

Note the location of the SCSI terminators.

Connect to a host or peripheral via the single-ended SCSI connector on the

rear panel of the Extender. An internal “active” bus terminator is included

to improve SCSI reliability and performance. This terminator can be

removed for systems requiring external termination.

A standard duplex fiberoptic cable with ST connectors provides the

interface between the local and remote Extender units. And for greater

application flexibility, the Extender supports 110- or 220-VAC operation

via a user-selectable switch and International standard IEC power

connector.

2.2 Unpacking Your Shipment

Unpack your SCSI Fiber Optic Extender from its original shipping carton

and inventory the contents. The package includes:

• (1) SCSI Fiber Optic Extender.

• (1) IEC AC Power Cord.

• (1) Package of Replacement Parts:

(1) 1-Amp fuse

(1) 2-Amp fuse

(1) 110-ohm network resistor.

• This User’s Manual.

SCSI

Terminators

Duplex Fiberoptic Cable

Up To 3000 feet (1 Km)

SCSI

Terminators

SCSI Fiber Optic Extender

2.3 Operator Controls and Indicators

Four front-panel LEDs light to give you at-a-glance status information

about the operation of the Extender (see Figure 2-3.).

POWER—

This lights when AC power is connected and switched-on to

the unit.

LINK ACTIVE—

This LED lights when two SCSI Fiber Optic Extenders

are powered up and connected to one another via fiberoptic cable.

BUS ACTIVE—

This LED provides a visual indication of the SCSI

interface BUSY signal. It is a general indication that devices are

communicating via the SCSI bus.

LINK ERROR—

Lights when the integrity of the fiberoptic link dips

below specification. When this LED is lit, data errors have occurred.

The SCSI Fiber Optic Extender will disconnect from the SCSI bus when

a Link Error is detected.

POWER SWITCH—

Located on the rear panel (see Figure 3-1.) Turn on

power by pressing the half of the switch marked “1”. Turn power off by

pressing the half of the switch marked “O”.

Figure 2-3. Front-Panel View.

LINK ACTIVE

BUS ACTIVE

LINK ERROR

POWER

CHAPTER 2: Introduction

2.4 Calling Your Supplier

If the Extender arrives incomplete, or subsequently malfunctions,

do not

attempt to alter or repair the unit

. It contains no user-serviceable parts. Contact

your supplier. Before you do, make a record of the history of the problem.

Your supplier will be able to provide more efficient and accurate assistance

if you have a complete description, including:

• The nature and duration of the problem.

• When the problem occurs.

• The components involved in the problem.

• Any particular application that, when used, appears to create the

problem or make it worse.

2.5 Shipping and Packaging

If you need to transport or ship your SCSI Fiber Optic Extender:

• We recommend that you use the original packaging container.

• If you are shipping the unit for repair, make sure you include its power

supply. If you are returning it, make sure you include this manual as

well. Before you ship, contact your supplier to get a Return Materials

Authorization (RMA) number.

SCSI Fiber Optic Extender

The SCSI Fiber Optic Extender requires no software configuration and

only nearby access to an AC electrical outlet for proper operation. That

makes installation fast and easy.

Install the Extender in any position and any location near the host

computer or peripherals that’s most convenient for you. Make sure that the

ventilation slots on the side of the unit are unobstructed and receive

adequate air flow.

Do not

place the Extender on any device that generates

heat.

NOTE

Switch off power to all computers and peripherals attached to the SCSI bu s

before installing the SCSI Fiber Optic Extender.

3.1 Setting the AC Line Voltage Switch

The SCSI Fiber Optic Extender can be powered from either a 110- or

220-VAC power source. Figure 3-1 shows the location of the external

voltage-selection switch on back of the unit. The default setting is 110-VAC.

CAUTION

Before installing this unit, verify that the voltage-selection switch is

switched to the appropriate setting to match your AC input source.

Figure 3-1. Rear-Panel View.

POWER

AC INPUT

RCV

XMT

220110

3. Installation

AC Voltage-Selection Switch

With the voltage-selection switch set properly, plug the female end of the

power cord into the back of the unit and plug the male end of the cord into

your AC power outlet.

3.2 Recommended Cable

Twisted-Pair Cable—

A 50-pin shielded cable and connector will provide a

connection with the greatest noise immunity and distance from your host or

peripheral to the SCSI Fiber Optic Extender. But note that this cable

connection may never exceed 6 feet (19.7 m).

Section 3.5

describes

requirements for connecting to the SCSI Bus.

Appendix B

shows the

standard SCSI connector pinning chart.

Fiberoptic Cable—

Up to 3000 feet (about 1 km) of standard, full-duplex

multimode 62.5/125 µm, 100/140 µm, or 50/125 µm fiberoptic cable.

Improper connector termination, splicing of the fiberoptic cable, or use of

other cable diameters will result in reduced link distances and increased

data error rates.

Neither of these cables are included with this unit. Call your supplier to

order them separately.

3.3 Internal/External Terminator Options

The SCSI Fiber Optic Extender features internal active SCSI bus

termination to improve the cable-matching characteristics between multiple

SCSI devices. Since some applications require external terminators, you

may remove these internal terminators for added application flexibility.

To remove the internal terminators, remove the four screws on the bottom

of the unit (see

Figure 3-2

) and gently unplug terminators RN1, RN2, and

RN3 from their positions on the printed circuit board (PCB)

(see

Figure 3-3

Normally, terminators should be installed on opposite ends of the SCSI bus.

Note that data errors may result if more than two sets of terminators are

installed on any SCSI bus.

3.4 Internal Terminator Power and Fuse

The SCSI Fiber Optic Extender contains a replaceable internal fuse to

provide power for an external terminator. This fuse supplies 1 amp at

5 volts to the TERMPWR signal. The fuse is installed in the socket labeled

F2 on the PCB (see

Figure 3-3

). The Extender contains internal protection

and will not be affected if other SCSI devices provide terminator power.

CHAPTER 3: Installation

SCSI Fiber Optic Extender

Figure 3-2. Remove Four Bottom-Panel Screws to Access the PCB.

3.5 Connecting to the SCSI Bus

The SCSI Fiber Optic Extender provides a transparent, optically isolated

SCSI bus over extended distances, so you can install the Extender at any

point on your SCSI bus. Terminators must be installed on both the local

and extended bus, so make sure that a maximum of two terminators are

installed on each side of the Extender link (see

Figures 2-1

and

2-2

Connect the twisted-pair cable from the host or SCSI peripheral to the

50-pin SCSI connector on back of the Extender. Use the bail-locking

mechanism to anchor the connection securely.

NOTE

If external termination is required, be sure to remove the internal termination

networks and replace them with an internal terminator fuse F2 (included).

(See Figures 3-2. and 3-3.).

MODEL NO:

SERIAL NO:

INPUT VOLTAGE 110/220VAC

ACI– 2000A

2003100

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