Black Box IC501A manual

IC500A 7/12/00 12:38 PM Page 901

DECEMBER 1998

IC500A

IC501A

SCSI Fiber Optic Bus Extenders

SCSI FIBER OPTIC

EXTENDER

POWER

LINK ACTIVE

BUS ACTIVE

LINK ERROR

COAX

FIBER

SELF

TEST

LINK

TEST

CUSTOMER

SUPPORT

INFORMATION

Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX

FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746

Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018

Web site: www.blackbox.com • E-mail: [email protected]

IC500A 7/12/00 12:38 PM Page 1

TRADEMARKS

TRADEMARKS USED IN THIS MANUAL

Windows NT is a trademark, and Windows is a registered trademark, of Microsoft

Corporation.

UL is a registered trademark of Underwriters Laboratories Incorporated.

Any trademarks mentioned in this manual are acknowledged to be the property of the trademark owners.

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SCSI FIBER OPTIC BUS EXTENDERS

FEDERAL COMMUNICATIONS COMMISSION

AND

CANADIAN DEPARTMENT OF COMMUNICATIONS

RADIO FREQUENCY INTERFERENCE STATEMENTS

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 J 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 necessary 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 publié par le ministère des Communications du Canada.

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NORMAS OFICIALES MEXICANAS (NOM)

ELECTRICAL SAFETY STATEMENT

NOM STATEMENT

INSTRUCCIONES DE SEGURIDAD

1. Todas las instrucciones de seguridad y operación deberán ser leídas antes de que el aparato eléctrico sea operado.

2. Las instrucciones de seguridad y operación deberán ser guardadas para referencia futura.

3. Todas las advertencias en el aparato eléctrico y en sus instrucciones de operación deben ser respetadas.

4. Todas las instrucciones de operación y uso deben ser seguidas.

5. El aparato eléctrico no deberá ser usado cerca del agua—por ejemplo, cerca de la tina de baño, lavabo, sótano mojado o cerca de una alberca, etc..

6. El aparato eléctrico debe ser usado únicamente con carritos o pedestales que sean recomendados por el fabricante.

7. El aparato eléctrico debe ser montado a la pared o al techo sólo como sea recomendado por el fabricante.

8. Servicio—El usuario no debe intentar dar servicio al equipo eléctrico más allá a lo descrito en las instrucciones de operación. Todo otro servicio deberá ser referido a personal de servicio calificado.

9. El aparato eléctrico debe ser situado de tal manera que su posición no interfiera su uso. La colocación del aparato eléctrico sobre una cama, sofá, alfombra o superficie similar puede bloquea la ventilación, no se debe colocar en libreros o gabinetes que impidan el flujo de aire por los orificios de ventilación.

10. El equipo eléctrico deber ser situado fuera del alcance de fuentes de calor como radiadores, registros de calor, estufas u otros aparatos (incluyendo amplificadores) que producen calor.

11. El aparato eléctrico deberá ser connectado a una fuente de poder sólo del tipo descrito en el instructivo de operación, o como se indique en el aparato.

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12. Precaución debe ser tomada de tal manera que la tierra fisica y la polarización del equipo no sea eliminada.

13. Los cables de la fuente de poder deben ser guiados de tal manera que no sean pisados ni pellizcados por objetos colocados sobre o contra ellos, poniendo particular atención a los contactos y receptáculos donde salen del aparato.

14. El equipo eléctrico debe ser limpiado únicamente de acuerdo a las recomendaciones del fabricante.

15. En caso de existir, una antena externa deberá ser localizada lejos de las lineas de energia.

16. El cable de corriente deberá ser desconectado del cuando el equipo no sea usado por un largo periodo de tiempo.

17. Cuidado debe ser tomado de tal manera que objectos liquidos no sean derramados sobre la cubierta u orificios de ventilación.

18. Servicio por personal calificado deberá ser provisto cuando:

A: El cable de poder o el contacto ha sido dañado; u

B: Objectos han caído o líquido ha sido derramado dentro del aparato; o

C: El aparato ha sido expuesto a la lluvia; o

D: El aparato parece no operar normalmente o muestra un cambio en su desempeño; o

E: El aparato ha sido tirado o su cubierta ha sido dañada.

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TABLE OF CONTENTS

Contents

Chapter Page

1. Specifications ............................................................................................................................6

2. Introduction ..............................................................................................................................8

2.1

Description......................................................................................................................8

2.2

Features ..........................................................................................................................8

3. Installation ..............................................................................................................................11

3.1

Unpacking Your Extender ..........................................................................................11

3.2

AC Line Voltage............................................................................................................11

3.3

Placement......................................................................................................................11

3.4

Cable Recommendations ............................................................................................11

3.5

Connecting the SCSI Fiber Optic Bus Extender to the SCSI Bus ............................12

3.6

Ensuring Proper SCSI Bus Termination ....................................................................12

3.7

Connecting a Fiberoptic Cable ..................................................................................12

3.8

Connecting a DB9 Coax Cable....................................................................................13

3.9

Verify Communications ..............................................................................................14

4. Operator Controls and Indicators ........................................................................................15

4.1

AC Switch ......................................................................................................................15

4.2

Indicators ......................................................................................................................15

4.3

Front-Panel Keypad ......................................................................................................16

5. Interfacing Requirements ......................................................................................................17

5.1

SCSI Cable Interface Requirements ..........................................................................17

5.2

Internal/External Terminator Options......................................................................18

5.3

Internal Terminator Power and Fuse ........................................................................18

5.4

Selecting Internal Terminator Power ........................................................................19

5.5

RS-232 Interface Pin Assignment ................................................................................19

5.6

Internal RS-232 Jumper Block ....................................................................................20

5.7

Rear-Panel Option Switches ........................................................................................20

5.8

RS-232 Remote Operation Commands ......................................................................21

5.9

ASCII Character Reference for SCSI Fiber Optic Bus Extender Box Selection......23

5.10 Windows Software ........................................................................................................24

5.11 Connecting Multiple SCSI Fiber Optic Bus Extenders ............................................24

5.12 Rack Mount Installation ..............................................................................................25

5.13 Fiberoptic Cable Requirements ..................................................................................26

6. Operation ................................................................................................................................27

6.1

SCSI Fiber Optic Bus Extender Operation ................................................................27

6.2

System Performance ....................................................................................................27

6.3

System Configuration Options ....................................................................................27

7. SCSI Technical Information ..................................................................................................29

7.1

SCSI Basics ....................................................................................................................29

7.2

SCSI Installation Tips ..................................................................................................30

7.3

SCSI Interface Signal Descriptions ............................................................................31

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1. Specifications

SCSI Interface

Maximum Data Rate..............................................40 MB per second

Wide SCSI Connector ..........................................68-pin

Narrow SCSI Connector........................................50-pin

SCSI to Fiber to SCSI Conversion Delay..............125 ns

Internal Terminator Power ..................................1 amp

Asynchronous and synchronous compatible

Conforms to ANSI X3.131 and X3T9.2 specifications

SCSI 1, 2, and SCSI 3 compatible

Resettable internal TERMPWR fuse

IC500A....................................................................Single-ended SCSI

Maximum Cable Length ..............................19.7 feet (6 meters)

Maximum Slew Rate ....................................3 ns

Active Internal Bus Termination

IC501A....................................................................Differential SCSI

Maximum Cable Length ..............................82 feet (25 meters)

Maximum Slew Rate ....................................3 ns

Passive Internal Bus Termination

Fiberoptic Link Interface

Maximum fiber cable length (both models):

6500 feet (2 km) with 8/125-µm single-mode fiber

1800 feet (550 meters) with 62.5/125-µm multimode fiber

Fiberoptic Serial Data Rate ..................................1.0625 Gigabits per second

Fiberoptic Connector Type ..................................SC

Optical Wavelength ..............................................850/1300 nm

Typical BER (Bit Error Rate)................................10 to 14

Coax Link Interface

Maximum coax cable length ................................100 feet (30 meters)

Impedance ....................................................150 ohms

Recommended Cable ..................................Gore FCN 1008-L

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CHAPTER 1: Specifications

Serial-Port Interface—SCSI Fiber Optic Bus Extender Control

Data Rate ................................................................9600/19200 baud

Mode ......................................................................No parity, 8 bits, 1 stop bit

Maximum Cable Length ......................................50 feet (15 meters)

Rear-Panel Connector ..........................................DB9 female

Serial-Port Interface—Extension

Data Rate ................................................................1200 bps to 112 kbps

Mode ......................................................................All modes

Maximum Cable Length ......................................50 feet (15 meters)

Rear-Panel Connector ..........................................DB9 female

Physical

Temperature ..........................................................32 to 131°F (0 to 55°C)

Humidity ................................................................Up to 90% relative humidity

Power ......................................................................90 to 260 VAC, 15 W, 48 to 65 Hz

Size..........................................................................1.7"H x 14.7"W x 8.1"D

(4.3 x 37.3 x 20.6 cm)

Weight ....................................................................3 lb. (1.4 kg)

Maximum Fiber Cable

Code

IC500A

IC501A

Description

Single-ended/Wide

Differential/Wide

Maximum Fiber Cable

2 km

2 km

Agency Approvals

UL ® , CUL, CE, FCC Class A

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2. Introduction

2.1 Description

The SCSI Fiber Optic Bus Extender lets you surpass the distance limitation of the single-ended and differential SCSI bus. The SCSI bus is one of the most popular interfaces used to connect additional devices to a computer system. With the SCSI

Fiber Optic Bus Extender, SCSI components such as disk drives, CD-ROM memory systems, RAID arrays, tape backups, and SCSI laser printers can be located up to

6500 feet (2 km) from the host computer.

Because the SCSI Fiber Optic Bus Extender is completely transparent to your SCSI system, additional computer software is not needed for installation or operation.

Wide SCSI

SCSI Fiber Optic

Bus Extender

30 to 10,000-ft.

Fiberoptic Link

Wide SCSI

SCSI Fiber Optic

Bus Extender

Figure 2-1. Typical SCSI Fiber Optic Bus Extender Configuration.

2.2 Features

• Extends SCSI bus to 6500 feet (2 km)

• 40 MB per second throughput

• Ultra SCSI compatible

• 30-foot (100-meter) coax link standard

• RS-232 serial-port passthrough

• SCSI 1, SCSI 2, SCSI 3 compatible

• Single-ended or differential SCSI interface

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CHAPTER 2: Introduction

• Fiber-channel-compatible optical link

• Standard SC connectors

• Internal bus termination

• No additional software required

• Advanced SCSI Fiber Optic Bus Extender Control software for remote control

• Transparent to the SCSI system

• Does not require a SCSI bus ID

The SCSI Fiber Optic Bus Extender supports Ultra SCSI, 40-MB-per-second, wide and narrow devices in asynchronous or synchronous mode. The Extender gives you the Ultra and Fast SCSI performance available in top-of-the-line computers and peripheral devices. Its advanced proprietary design enables the Extender to maintain complete SCSI command functionality while remaining transparent to you.

The Extender includes 68- and 50-pin high-density SCSI-2 connectors for narrow and wide devices.

Internal bus terminators are switch-selectable to support flexible installations.

A standard SC duplex fiberoptic connector supports a fiberoptic interface between local and remote units.

The SCSI Fiber Optic Bus Extender also includes two duplex coaxial interfaces to support shorter SCSI extender distances.

The SCSI Fiber Optic Bus Extender can be operated and controlled via the remote

RS-232 interface using the included SCSI Fiber Optic Bus Extender Control software. Standard modem software can also be used to control the Extender. Up to 8 units can be connected together and controlled from one serial port using the internal RS-485 multidrop interface. Simple ASCII commands control SCSI Fiber

Optic Bus Extenders in addition to the supplied Windows software.

The RS-232 serial port can also be configured to pass-through the interface to a remote SCSI Fiber Optic Bus Extender, thus letting you operate a remote RS-232 device. This feature is often used in tape-storage systems where control information is provided on a separate RS-232 interface.

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The SCSI Fiber Optic Bus Extender also contains a universal power-cord receptacle, and it auto-switches any AC input voltage between 100 and 240 VAC.

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3. Installation

CHAPTER 3: Installation

3.1 Unpacking Your Extender

Unpack your SCSI Fiber Optic Bus Extender from its original shipping carton and check the contents. The package should include:

• (1) SCSI Fiber Optic Bus Extender

• (1) AC power cord (115 or 230 VAC, depending on what you ordered)

• This user’s manual

• 10-ft. (3-m) 9-pin male to 9-pin female RS-232 cable

• 9-pin male to 25-pin female RS-232 adapter

• SCSI Fiber Optic Bus Extender Control software

• Rackmount rails

• Desk-mount rubber feet

• Two loopback connectors

3.2 AC Line Voltage

The Extender can be externally connected to any AC input voltage between 100 and 240 volts. Unless otherwise specified, the Extender will be shipped with a 110volt power cord. Black Box offers a complete source of replacement power cords for most countries and appropriate voltages.

3.3 Placement

Place the Extender near the host computer and peripherals. Make sure the ventilation slots on the sides of the unit obtain adequate airflow. Do not place the

Extender on any devices that generate excessive heat.

3.4 Cable Recommendations

High-quality shielded SCSI cables will provide the greatest noise immunity and distance from the Extender to your peripherals. But in any case, no cables connected to the Extender may exceed 19.7 feet (6 meters) for single-ended or 82 feet (25 meters) for differential devices.

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3.5 Connecting the SCSI Fiber Optic Bus Extender to the SCSI Bus

NOTE

The IC501A supports a differential SCSI interface only. Do not attach this unit to a single-ended SCSI system or it may damage your system.

Switch off power to all computers and peripherals attached to the SCSI bus, before connecting the SCSI Fiber Optic Bus Extender.

You may install the SCSI Fiber Optic Bus Extender at any point on the SCSI bus.

The IC501A can be operated with another IC501A or an IC500A.

3.6 Ensuring Proper SCSI Bus Termination

SCSI buses require proper termination to ensure reliable operation. Since the

SCSI Fiber Optic Bus Extender is used in the middle of a SCSI chain, additional termination is needed at each Extender, in addition to the standard terminators at each end of the link.

That’s a total of four terminators, two on each side of the SCSI Fiber Optic Bus

Extender. Note too that your system will fail if more than two terminators are installed on

any one side of the Extender.

You have the option of disabling the internal SCSI Fiber Optic Bus Extender termination to meet system configurations and requirements.

NOTE

Sections 5.1 and 5.2 provide detailed information on SCSI Fiber Optic

Bus Extender termination option settings.

3.7 Connecting a Fiberoptic Cable

A duplex fiberoptic cable with standard SC plugs interconnects two SCSI Fiber

Optic Bus Extenders.

L

OCAL

SCSI F

IBER

O

PTIC

B

US

E

XTENDER

Insert one plug into each fiberoptic socket on the rear of the local Extender.

Measure that the “key” on each plug is facing the top of the Extender before insertion.

NOTE

Make sure that the plug is properly aligned with the connector before inserting. Do not force the plug into the connector or you may damage it.

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Key

CHAPTER 3: Installation

Figure 3-1. Installing SC Fiberoptic Plugs.

R EMOTE SCSI F IBER O PTIC B US E XTENDER

For proper operation, the fiberoptic transmitter (XMT) on the local unit must be connected to the remote fiberoptic receiver (RCV), and the local fiberoptic receiver (RCV) must be connected to the remote fiberoptic transmitter (XMT).

XMT XMT

RCV RCV

Figure 3-2. Connecting Two SCSI Fiber Optic Bus Extenders.

3.8 Connecting a DB9 Coax Cable

A fiber-channel-compatible DB9 coax interface supports a maximum distance of

100 feet (30 meters).

A high-quality duplex coax cable with standard fiber-channel compatible DB9 connectors can be used to connect two SCSI Fiber Optic Bus Extenders up to 98.4

feet (30 meters) apart. Impedance for this cable is 150 ohms. We recommend using cables similar to W. L. Gore & Associates Model FCN-1008.

Connect each plug into the connector on the rear of the SCSI Fiber Optic Bus

Extender labeled Coax Interface. Select Coax from the Extender’s front-panel keypad on both SCSI Fiber Optic Bus Extenders. The Link Active indicator on the front panel will signify a complete link.

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NOTE

Make sure that the connector is installed in the Coax Interface and not the Serial Interface. Damage to the internal circuitry may result from an improper connection.

3.9 Verify Communications

Turn on AC power to both SCSI Fiber Optic Bus Extenders and verify that the Link

Active indicators are lit. This indicates that the local and remote Extenders are communicating. Other computer equipment can now be powered up.

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CHAPTER 4: Operator Controls and Indicators

4. Operator Controls and

Indicators

4.1 AC Switch

The Extender’s power switch is located on the rear panel.

NOTE

Always turn on the SCSI Fiber Optic Bus Extender before turning on

SCSI devices and computers. This will ensure that devices are found when the computers boot up.

4.2 Indicators

Four front-panel indicators provide status information for the Extender.

Power— Indicates that power is applied to the unit.

Link Active— Shows that SCSI Fiber Optic Bus Extenders are communicating over the fiberoptic link.

NOTE

The SCSI Fiber Optic Bus Extender will electronically disconnect itself from the SCSI bus when the link is not active.

Bus Active— A visual indication of the busy signal on the SCSI bus interface. This indicator provides a general indication of devices communicating on the SCSI bus.

Link Error— Notifies the user that the integrity of the fiberoptic link is below specification and data-transfer errors will occur if not corrected. The Extender will disconnect from the SCSI bus when a Link Error is detected.

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4.3 Front-Panel Keypad

The front-panel keypad selects the SCSI Fiber Optic Bus Extender interface and test modes.

Fiber— Selects the fiberoptic link as the communications interface.

Coax— Selects the coaxial link as the communications interface.

Self-Test— Initiates a SCSI Fiber Optic Bus Extender self-test. For proper operation, either the self-test loopback plug or connection to a remote SCSI Fiber

Optic Bus Extender Coax interface must be installed.

Link Test— Initiate a SCSI Fiber Optic Bus Extender link test. When Fiber is selected, the test will be performed over the fiberoptic interface. When Coax is selected, the test will be performed over the coax interface.

NOTE

The Self-Test or Link Test, when pressed, will blink yellow for approximately 5 seconds. A “green” indicates the test was completed without error. A “red” indicates that the test failed. A failed test may indicate a bad connection or excessive fiber or coax cable length.

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CHAPTER 5: Interfacing Requirements

5. Interfacing Requirements

5.1 SCSI Cable Interface Requirements

The SCSI Fiber Optic Bus Extender can be installed at any point on the SCSI bus.

The Extender provides an optically isolated SCSI bus over extended distances.

Terminators must be installed on both the local and extended bus. Make sure that

a maximum of two terminators are installed on each bus.

The Extender has a 50-pin and a 68-pin connector for narrow and wide SCSI devices, respectively.

5.1.1 S INGLE -E NDED SCSI F IBER O PTIC B US E XTENDER

The IC500A supports a maximum cable length of 19.7 feet (6 meters) at standard

SCSI data rates (5 Mbps, narrow), or 9 feet (2.7 meters) at “Fast” SCSI data rates

(10 Mbps).

5.1.2 D

IFFERENTIAL

SCSI F

IBER

O

PTIC

B

US

E

XTENDER

The IC501A supports a maximum cable length of 82 feet (25 meters) at standard or “Fast” SCSI data rates.

NOTE

Do not connect devices to both the Wide and Narrow connectors at the same time. This will cause termination and noise problems in your system.

Do not intermix single-ended and differential devices on any one side of the SCSI chain unless a SCSI differential converter is used to convert from one bus type to the other.

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5.2 Internal/External Terminator Options

The SCSI Fiber Optic Bus Extender contains internal SCSI bus termination to improve the cable-matching characteristics between multiple SCSI devices. Each

SCSI Fiber Optic Bus Extender requires a terminator either internally selected or externally connected. To enable the internal termination, move the Rear Panel

Options Switch, TERM, to “ON.” (The default is ON.)

OFF

ON

Figure 5-1. Terminator Selection.

NOTE

Data errors will result if more than two sets of terminators are installed on any SCSI bus.

5.3 Internal Terminator Power and Fuse

The SCSI Fiber Optic Bus Extender can supply external terminator power via an internal resettable fuse. This fuse supplies 1 amp at 5 volts to the TERMPWR signal. The SCSI Fiber Optic Bus Extender contains internal protection and will not be affected if other SCSI devices provide terminator power.

To enable external terminator power, place a jumper pin in location E2.

NOTE

Default is INSTALLED.

E2

Figure 5-2. Enable External Terminator Power.

NOTE

Replace all fuses with similar type and rating.

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5.4 Selecting Internal Terminator Power

Internal SCSI Fiber Optic Bus Extender termination can be powered by internal 5volt power or externally from the SCSI bus TERMPWR line. Depending on system applications, it may be advantageous to power the internal terminators by the SCSI peripheral or computer. Note: Default is “INTERNAL 5V.”

E1

INTERNAL 5V

EXTERNAL TERMPWR

Figure 5-3. Terminator Power Jumper Locations.

5.5 RS-232 Interface Pin Assignment

The SCSI Fiber Optic Bus Extender has a DB9 female connector for external control of the unit. The connector is compatible with standard RS-232 modem cables.

Table 5-1. RS-232 Connector Pin Assignment

Signal

DCD

RXD

TXD

DTR

GND

DSR

RTS

CTS

Description

Data Carrier Detect

Receive Data

Transmit Data

Data Terminal Ready

Signal Ground

Data Set Ready

Request To Send

Clear To Send

Not Used

DB9 Pin

1

2

3

6

7

4

5

8

9

DB25 Pin

8

3

2

20

7

6

4

5

22

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5.6 Internal RS-232 Jumper Block

NOTE

To access jumper options, remove the two rear-panel screws and slide the top cover off the Extender.

Jumper block E7 through E10 configures the RS-232 interface for normal and nullmodem serial cables. The SCSI Fiber Optic Bus Extender default configuration operates with standard modem cables.

E7

E8

E9

E10

1 2 3

DEFAULT

TXD

RXD

RTS

CTS

E7 TXD

E8

E9

RXD

RTS

E10 CTS

1 2 3

NULL-MODEM

Figure 5-4. Signal Control Jumper Block.

NOTE

To bypass RTS and CTS control signals, jumper E9-1 and E10-1. (This may be required in some DOS applications.)

5.7 Rear-Panel Option Switches

The rear-panel option switches select the SCSI Fiber Optic Bus Extender box number and RS-232 serial baud rate, and lock the front-panel keypad.

OFF

ON

20

Figure 5-5. Rear-Panel Option Switches.

INT/EXT Serial Port LOCK

ON Internal ON

OFF Extended OFF

Front Panel

Unlocked

Locked

BAUD

ON

OFF

Rate

9600

19,200

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Table 5-2. SCSI Fiber Optic Bus Extender Box Selection

Sel 2 Sel 1

ON

ON

ON

ON

ON

ON

OFF

OFF

Sel 0 Box No:

ON

OFF

ON

OFF

1

2

3

4

Sel 2 Sel 1 Sel 0

OFF ON

OFF ON

OFF OFF

OFF OFF

ON

OFF

ON

OFF

Box No:

7

8

5

6

5.8 RS-232 Remote Operation Commands

The SCSI Fiber Optic Bus Extender can be controlled via the RS-232 interface using simple ASCII control characters. Any standard serial interface will work if you set it to these parameters: a. Baud rate internally selected for 9600 or 19200 baud.

(Factory default is 9600 baud.) b. Transmit and receive is set for 8 data bits, 1 stop bit, no parity.

c. Serial interface operates in half-duplex mode.

So, for example, this would be the DOS command to set a PC for communication with the Extender: MODE COMx 9600,N,8,1

The sequence for communicating with the SCSI Fiber Optic Bus Extender is defined as: a. Start sequence:

ASCII “CR”,”/”, “/“ b. Extender number:

Box 1 - “7C” ( | )

Box 2 - “7D” ( } ) c. Command :

Select Coax - “C”

Select Fiber - “F”

Box 3 - “7E” ( ~ )

Box 4 - “7F” ( DEL ) d. Transmit Data to SCSI Fiber Optic Bus Extender:

ASCII “K” - Selects desired ports.

e. End sequence:

ASCII “CR”

Typical Transmit Data sequence:

<cr> / / | FK <cr>

<cr> / / } CK <cr>

(selects Fiber, Box 1)

(selects Coax, Box 3)

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Table 5-3. List of Commands

Command

Select Coax

Select Fiber

Lock Front Panel

Unlock Front Panel

Zero self-test and link test statistics

Yank on SCSI Reset line

Initiate Self-Test

Initiate Link Test

Report S/N and data of manufacture

Report Status

Report SCSI Bus Inactivity

Report Test Statistics

Report Performance

Report Revision

Report Temperature

Command Example

Character

C <CR>//|C<CR>

I

S

T

P t

R l

?

Y s

F

L

U

Z

Response

<CR>//|F<CR>

<CR>//|L<CR>

<CR>//|U<CR>

<CR>//|Z<CR>

<CR>//|Y<CR>

<CR>//|s<CR>

<CR>//|l<CR>

<pass>, <fail>

<pass>, <fail>

<CR>//|?text…<CR> <text…..>

<CR>//|S<CR>

<CR>//|I<CR>

<abcdefgh>

<xxxx>

<CR>//|T<CR> <abcdefgh>

<CR>//|P<xy><CR> <xy>

<CR>//|R<CR>

<CR>//|t<CR>

<2030316>

<30> (celsius)

E

XPANDED

L

IST OF

C

OMMANDS a. Report SCSI Performance: command: <CR>//|P<xy><CR> report: xy: hex 00-FF b. SCSI bus Inactivity to SCSI report: command: <CR>//|I<CR> report: xxxx: hex inactive time in tenths of seconds c. Report Serial Number and Date of Manufacture: command: <CR>//}?<CR> report: //}?20301150 12-15-94

20301150 = serial number

4-15-97 = date of manufacture

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IC500A 7/12/00 12:38 PM Page 23

CHAPTER 5: Interfacing Requirements d. Report Test Statistics command: <CR>//|T<abcdefgh><CR> report: ab: # of link tests performed cd: # of link tests failed ef: # of self-tests performed gh: # of self-tests failed e. Report Status command: <CR>//|S<abcdefgh><CR> report: abcdefgh: bit 7,6,5,4,3,2,1,0

bit 7: (msb) not used (always 0) bit 6: loss of sync (1 = sync lost) bit 5: terminator on (1 = terminator on) bit 4: front panel locked ( 1 = locked) bit 3: link active status (1 = link active) bit 2: fiber power ( 1 = fiber power on) bit 1: fiber/coax selection (1 = fiber, 0 = coax) bit 0: (lsb) current busy status

(1 = bus busy, 0 = bus not busy)

5.9 ASCII Character Reference for SCSI Fiber Optic Bus Extender Box Selection

switch

ASCII switch

ASCII switch

ASCII switch

ASCII l

17 t

25

9 d

|

1

18 m

26 u

2

}

10 e

19 n

27 v

3

~ f

11

20 o

28 w

4 5

(DEL) `

12 g

13 h

21 p

29 x

22 q

30 y

6 a i

14 r

23

31 z

7 b j

15

24 s

32

{

8 c

16 k

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IC500A 7/12/00 12:38 PM Page 24


5.10 Windows Software

Your SCSI Fiber Optic Bus Extender is supplied with Windows ® 3.1, Windows 95, and Windows NT™ compatible software to allow remote control of the SCSI Fiber

Optic Bus Extender. Follow instructions on the disks to install the software.

5.11 Connecting Multiple SCSI Fiber Optic Bus Extenders

Up to 8 SCSI Fiber Optic Bus Extenders can be controlled by a single RS-232 serial interface.

5.11.1 U SING THE SCSI F IBER O PTIC B US E XTENDER RS-485 I NTERFACE

The SCSI Fiber Optic Bus Extender RS-485 interface is available on the rear-panel connector labeled Coax. Units are connected in parallel and connected to a modem on the computer serial port.

Table 5-4. Rear-Panel DB9 Coax RS-485 Connector Assignment

Signal

GND

+SIO

-SIO

Description

Ground

RS-485 (+IO)

RS-485 (-IO)

Pin

3

7

8

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IC500A 7/12/00 12:38 PM Page 25


5.11.2 U

SING THE

SCSI F

IBER

O

PTIC

B

US

E

XTENDER

RS-232 S

ERIAL

I

NTERFACE

To operate in this configuration, external modems must be used to convert the each RS-232 serial port into a RS-485 interface. This RS-485 interface is then daisychained to each SCSI Fiber Optic Bus Extender.

Computer

First Modem

SCSI Fiber

Optic Bus

Extender 1

SCSI Fiber

Optic Bus

Extender 2

SCSI Fiber

Optic Bus

Extender 3

Last Modem

SCSI Fiber

Optic Bus

Extender 4

Figure 5-6. Multiple SCSI Fiber Optic Bus Extenders with Modems.

5.12 Rack Mount Installation

The SCSI Fiber Optic Bus Extender can be installed in a standard 19-inch (EIA unit) rack.

5.12.1 I

NSTALLATION IN A

R

ACK

Attach the two mounting brackets to each side of the SCSI Fiber Optic Bus

Extender enclosure using the screws provided. Set the unit into position on the rack, aligning the mounting bracket holes with the rack holes. Use 5 ⁄

8

" 10-32 or 12-

24 screws to install in the rack.

5.12.2 R ACKMOUNT C ONSIDERATIONS

1. For proper operation, make sure that the maximum recommended operating ambient temperature of 149°F (55°C) is not exceeded. Remember that, if this unit is installed in a closed or multi-unit rack assembly, the operating ambient temperature of the rack environment may be greater than room ambient.

2. Make sure when the SCSI Fiber Optic Bus Extender is installed in its rack that the amount of air flow required for safe operation is not compromised.

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IC500A 7/12/00 12:38 PM Page 26


3. Make sure that mounting the SCSI Fiber Optic Bus Extender in a rack does not cause a hazardous condition due to uneven mechanical loading.

4. Make sure that adding the Extender doesn’t overload the rack’s power circuit.

5. Make sure the power connection is properly grounded.

5.13 Fiberoptic Cable Requirements

The SCSI Fiber Optic Bus Extender fiberoptic interface incorporates industrystandard SC optical connectors. Standard full-duplex multimode fiberoptic cables can be used with this system. Typical cable types include 62.5/125-µm, 50/125-µm, and 8/125-µm fiberoptic cable.

High-quality connectors and low-loss cable will provide the greatest operating distance between units. The maximum achievable distance between units will vary depending on the type of fiberoptic cable used.

Improper connector termination, splicing of the fiberoptic cable, and use of other cable diameters may result in reduced link distances and more data errors.

The maximum fiber cable lengths are listed below.

Maximum fiber cable length:

6500 feet (2 km) with 8/125-µm single-mode fiber

1800 feet (550 meters) with 62.5/125-µm multimode fiber

Keep fiberoptic connectors and SCSI Fiber Optic Bus Extender optical components free of dust and dirt. Whenever cables are not mated to the SCSI

Fiber Optic Bus Extender, cover them with the protective plastic caps included with the system.

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IC500A 7/12/00 12:38 PM Page 27

CHAPTER 6: Operation

6. Operation

6.1 SCSI Fiber Optic Bus Extender Operation

The SCSI Fiber Optic Bus Extender converts SCSI data and command information into a high-speed (1.06-GHz) serial data stream which is transmitted over a fiberoptic interface to another remote SCSI Fiber Optic Bus Extender. The remote

Extender decodes the data stream and re-converts it to the proper SCSI signals.

The fiberoptic serial link conforms to the ANSI X3T9.5 encoding scheme specified in the Fibre Channel specification. Fiber optics are virtually immune to all forms of radio frequency and electromagnetic interference (RFI/EMI). An unauthorized tap of the link is nearly impossible without detection. Fiberoptic cable is also lighter and smaller than standard wire cable, allowing easier installation.

SCSI bus signals are routed through proprietary switching logic, which enables the

SCSI Fiber Optic Bus Extender to appear “transparent” to devices on the SCSI bus.

The SCSI Fiber Optic Bus Extender will disconnect from the SCSI bus interface in the event of a fiberoptic link failure or disconnection from power source.

6.2 System Performance

The SCSI Fiber Optic Bus Extender will support any combination of asynchronous and synchronous SCSI devices on the bus. Overall system performance will depend on the individual data rate and protocol of each SCSI device plus the overhead of the host computer.

6.3 System Configuration Options

The SCSI Fiber Optic Bus Extender supports a maximum data rate of 40 mbps using wide SCSI devices. This data rate is often referred to as “ULTRA/WIDE

SCSI.”

To ensure optimum system performance, some system configurations may require a secondary SCSI channel to interface with the SCSI Fiber Optic Bus Extender.

In this configuration the primary SCSI bus would be connected to the local highspeed peripherals.

The secondary SCSI bus would be used exclusively as the extended SCSI bus.

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IC500A 7/12/00 12:38 PM Page 28


Computer

SCSI

Channel A

Extender

SCSI Channel B

30 to 10,000'

Fiberoptic Link

Extender

CD-ROM Tower

Disk Drive

Disk Drives

Figure 6-1. Alternate System Configuration.

Tape Drive

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IC500A 7/12/00 12:38 PM Page 29

CHAPTER 7: SCSI Technical Information

7. SCSI Technical Information

7.1 SCSI Basics

SCSI-1

The original specification supports data transfers up to 5 MB per second on an 8bit wide parallel data bus. SCSI 1 standards had some incompatibility problems between host adapters and peripheral devices. The need to improve compatibility, increase transfer rates, and add other features for better performance required a review of the specifications.

SCSI-2

Improved compatibility and higher transfer rates were provided in this enhancement. The addition of Wide SCSI permits 16 or 32 bits to be transferred in parallel, the latter requiring two cables. In combination with the “Fast SCSI” option, synchronous data transfers up to 10 MB per second for 8-bit, 20 MB per second for 16-bit, and 40 MB per second for 32-bit were achieved.

SCSI-3

The most significant additions include the ability to address up to 32 devices, a 16bit single cable data bus, and serial SCSI protocol. The SCSI-3 standard has been split into several subdocuments, including the SCSI Parallel Interface (SPI) which is based on a layered protocol and the SCSI Interlocked Protocol (SIP), a software link protocol.

Signal Wiring

The signal wire used in a SCSI bus has an impact on bus performance. The two wiring techniques generally used for SCSI are single-ended and differential.

With single-ended wiring, a single wire carries the signal from initiator to target.

Single-ended circuitry is not noise-resistant and is generally limited to about 6 meters at data-transfer speeds of 10 MB per second.

Differential wiring uses two wires for each signal and offers exceptional noise resistance because it does not rely on a common ground. This allows cables up to

25 meters and reliable operation at 10 MB per second or faster. Differential wiring and circuitry is more complex than single-ended and generally tends to be more expensive to implement.

Common Problems

The majority of problems encountered with SCSI bus installations are due to unbalanced or improper impedances on the SCSI bus transmission cables caused

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IC500A 7/12/00 12:38 PM Page 30

SCSI FIBER OPTIC BUS EXTENDERS by varying manufacturers’ peripheral devices. SCSI terminators compensate for these inherent impedance mismatches on a SCSI bus where peripheral devices such as hard drives, CD-ROM drives, scanners, or printers are used.

Passive Terminators

The most basic is a passive-resistance style terminator. This is usually supplied with peripherals and frequently does a poor job of balancing the impedance of the

SCSI bus. Passive terminators are resistor networks that allow signal voltages to vary with the load and terminator power supplied, resulting in unstable signals from end to end on the bus and causing data errors. Passive terminators are no longer recommended by ANSI for designs.

Active Terminators

Active terminators add a voltage regulator to the circuit to regulate signal voltages with varying loads and termpower, allowing a consistent signal to be transmitted everywhere on the bus which compensates for the varying bus lengths and signal loads. Active termination is the minimum ANSI-recommended termination.

7.2 SCSI Installation Tips

Keep your SCSI chain short. Official SCSI specifications limit a SCSI chain to no more that 19.7 feet (6 meters) long. Practical experience says the shorter the better. The maximum length you should allow between devices is 3 feet (0.9 m).

Never assign the same SCSI ID number to two devices on the same bus. SCSI uses these numbers as addresses to ensure that information goes to the correct location.

Giving two devices the same address can result in lost information.

Know that some SCSI-ID numbers may be reassigned. Internal boot hard drives are usually set to ID 0, while secondary hard drives are set to 1. Motherboards or host adapters are generally set to ID 7.

Always terminate the first and last devices on the chain. Drives purchased specifically for internal use nearly always arrive with terminators installed. If in doubt, call the vendor you purchased a device from.

If the last device on the chain has two SCSI connectors, attach the cable to one and a

terminator to the other. Otherwise you’ll have an open connector that may cause noise on the SCSI chain.

Always turn off the power to your computer and SCSI devices before swapping cables or

moving devices around. SCSI cables contain sensitive data-transmission lines and one or more live power wires.

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Turn on your SCSI devices before you turn on the computer. Some SCSI devices will not mount if they are not running when you power up your computer. Shutting down your computer first and then the attached SCSI devices allows your system to completely “flush” itself.

7.3 SCSI Interface Signal Descriptions

A total of 18 signals are required for the SCSI interface:

BSY (BUSY).

An “OR-tied” signal indicating that the bus is being used.

SEL (SELECT).

An “OR-tied” signal used by an initiator to select a target or by a target to reselect an initiator.

C/D (CONTROL/DATA).

A signal driven by a target that indicates whether

CONTROL or DATA information is on the DATA BUS. True indicates

CONTROL.

I/O (INPUT/OUTPUT).

A signal driven by a target that controls the direction of data movement on the DATA BUS with respect to an initiator. True indicates input to the initiator. This signal is also used to distinguish between SELECTION and

RESELECTION phases.

MSG (MESSAGE).

A signal driven by a target during the MESSAGE phase.

REQ (REQUEST).

A signal driven by a target to indicate a request for a REQ/ACK data-transfer handshake.

ACK (ACKNOWLEDGE).

A signal driven by an initiator to indicate an acknowledgement for a REQ/ACK data-transfer handshake.

ATN (ATTENTION).

A signal driven by an initiator to indicate the ATTENTION condition.

RST (RESET).

An “OR-tied” signal that indicates the RESET condition.

DB(7-0,P) (DATA BUS).

Eight data-bit signals, plus a parity-bit signal, that form a data bus. DB(7) is the most significant bit and has the highest priority during the

ARBITRATION phase. Bit number, significance, and priority decrease downward to DB(0). A data bit is defined as one when the signal value is true and is defined as zero when the signal value is false. Data parity DB(P) shall be odd.

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Table 7-1. IC500A SCSI Connector Assignments

Single-Ended/8-Bit SCSI (Narrow)

Connector Pin Number

Signal Name Shielded

-DB(0) 26

-DB(1)

-DB(2)

-DB(3)

27

28

29

-DB(4)

-DB(5)

-DB(6)

-DB(7)

-DB(P)

GROUND

GROUND

RESERVED

TERMPWR

RESERVED

GROUND

-ATN

GROUND

-BSY

-ACK

-RST

-MSG

-SEL

-C/D

-REQ

-I/O

42

43

44

45

38

39

40

41

34

35

36

37

30

31

32

33

46

47

48

49

50



GROUND 1

GROUND

GROUND

GROUND

2

3

4

GROUND

GROUND

GROUND

GROUND

GROUND

GROUND

GROUND

RESERVED

OPEN

RESERVED

GROUND

GROUND

GROUND

GROUND

GROUND

GROUND

GROUND

GROUND

GROUND

GROUND

GROUND

17

18

19

20

13

14

15

16

9

10

11

12

7

8

5

6

21

22

23

24

25

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IC500A 7/12/00 12:38 PM Page 33


Pin Number

1

2

3

32

33

34

28

29

30

31

24

25

26

27

20

21

22

23

16

17

18

19

12

13

14

15

10

11

8

9

6

7

4

5

Table 7-2. IC500A SCSI Connector Assignments

Single-Ended/16-Bit SCSI (Wide)

Signal Name

GROUND

GROUND

GROUND

GROUND

GROUND

GROUND

GROUND

GROUND

GROUND

GROUND

GROUND

GROUND

GROUND

GROUND

GROUND

GROUND

GROUND

GROUND

GROUND

GROUND

GROUND

GROUND

GROUND

GROUND

GROUND

GROUND

GROUND

GROUND

GROUND

GROUND

GROUND

TERMPWR

TERMPWR

RESERVED

Signal Name

-DB12

-DB13

-DB14

-C/D

-REQ

-I/O

-DB8

-DB9

-DB10

-DB11

GROUND

-ATN

GROUND

-BSY

-ACK

-RST

-MSG

-SEL

-DB15

-DBP1

-DB0

-DB1

-DB2

-DB3

-DB4

-DB5

-DB6

-DB7

-DBP

GROUND

GROUND

TERMPWR

TERMPWR

RESERVED

Pin Number

35

36

37

66

67

68

62

63

64

65

58

59

60

61

54

55

56

57

50

51

52

53

46

47

48

49

42

43

44

45

38

39

40

41

33

IC500A 7/12/00 12:38 PM Page 34


Table 7-3. IC501A. SCSI Connector Assignments

Differential/8-Bit SCSI (Narrow)



GROUND 26

-DB(0)

-DB(1)

-DB(2)

-DB(3)

-DB(4)

-DB(5)

-DB(6)

-DB(7)

-DB(P)

GROUND

RESERVED

TERMPWR

RESERVED

-ATN

GROUND

-BSY

-ACK

-RST

-MSG

-SEL

-C/D

-REQ

-I/O

GROUND

39

40

41

42

35

36

37

38

31

32

33

34

27

28

29

30

47

48

49

50

43

44

45

46



GROUND 1

+DB(0)

+DB(1)

+DB(2)

+DB(3)

+DB(4)

+DB(5)

+DB(6)

+DB(7)

+DB(P)

DIFFSENS

RESERVED

TERMPWR

RESERVED

+ATN

GROUND

+BSY

+ACK

+RST

+MSG

+SEL

+C/D

+REQ

+I/O

GROUND

14

15

16

17

10

11

12

13

8

9

6

7

4

5

2

3

22

23

24

25

18

19

20

21

34

IC500A 7/12/00 12:38 PM Page 35


Shielded

35

36

65

66

67

68

61

62

63

64

57

58

59

60

53

54

55

56

49

50

51

52

45

46

47

48

41

42

43

44

37

38

39

40

Table 7-4. IC501A. SCSI Connector Assignments

Differential/16-Bit SCSI (Wide)

Signal Name

-DB(12)

-DB(13)

RESERVED

-ATN

GROUND

-BSY

-ACK

-RST

-MSG

-SEL

-C/D

-REQ

-I/O

GROUND

-DB(8)

-DB(9)

-DB(10)

-DB(11)

-DB(14)

-DB(15)

-DB(P1)

GROUND

-DB(0)

-DB(1)

-DB(2)

-DB(3)

-DB(4)

-DB(5)

-DB(6)

-DB(7)

-DB(P)

GROUND

TERMPWR

TERMPWR

Signal Name

+DB(12)

+DB(13)

RESERVED

+ATN

GROUND

+BSY

+ACK

+RST

+MSG

+SEL

+C/D

+REQ

+I/O

GROUND

+DB(8)

+DB(9)

+DB(10)

+DB(11)

+DB(14)

+DB(15)

+DB(P1)

GROUND

+DB(0)

+DB(1)

+DB(2)

+DB(3)

+DB(4)

+DB(5)

+DB(6)

+DB(7)

+DB(P)

DIFFSENS

TERMPWR

TERMPWR

Shielded

1

2

31

32

33

34

27

28

29

30

23

24

25

26

19

20

21

22

15

16

17

18

11

12

13

14

9

10

7

8

5

6

3

4

35

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© Copyright 1998. Black Box Corporation. All rights reserved.

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