Black Box MD640A-ST-R2 Manuale utente

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]

FEBRUARY 1996

MD640A-ST-R2

MD640A-SMA-R2

MD640AE-ST-R2

MD640AE-SMA-R2

MultiMode FOMs -ST and -SMA

POWER

Test

Modes

Remote

Normal

Local

TD RD CDRTS

MultiMode FOM

Contents

Chapter Page

1. Specifications ............................................................................................. 1

2. Introduction ............................................................................................... 3

2.1 Features ............................................................................................... 3

2.2 Description .......................................................................................... 4

3. Configuration ............................................................................................. 5

4. Installation .................................................................................................. 8

4.1 Single-Fiber Connection ..................................................................... 8

4.2 RS-232 Connection ............................................................................. 9

5. Operation ................................................................................................. 10

5.1 LED Indicators .................................................................................. 10

5.2 Power-Up ........................................................................................... 11

5.3 Loopback-Test Modes ....................................................................... 11

5.4 Power-Down ....................................................................................... 12

6. Troubleshooting ...................................................................................... 13

6.1 Calling Black Box .............................................................................. 13

6.2 Shipping and Packaging ................................................................... 13

Appendix: RS-232 Pinout .............................................................................. 14

MULTIMODE FOMS -ST AND -SMA

TRADEMARKS USED IN THIS MANUAL

ST is a registered trademark of AT&T.

Any other trademarks mentioned in this manual are acknowledged to be the property

of the trademark owners.

CHAPTER 1: Specifications

Cable Required — (1) Multimode fiberoptic cable, 62.5-µm core

Interface — EIA RS-232/CCITT V.24, DCE

Protocols — Asynchronous or synchronous

Clock — Internal or external from attached RS-232 device

Flow Control — Transparent hardware (RTS/CTS and DTR/DSR

passed through from DTE) or local hardware or

software (RTS/CTS or X-ON/X-OFF), user-

selectable

Operating Mode — Point-to-point

Speed — Asynchronous: Up to 38.4 Kbps;

Synchronous: 2.4, 9.6, 19.2, 38.4, 56, 64, 192, or

256 Kbps

Maximum

Distance — 2.5 km (1.5 mi.) at all data rates,

5 km (3.1 mi.) at data rates of 64 Kbps or below

Modulation — 3B4B

Wavelength — 880 nm

Attenuation — 14 dB

LED-Responsivity

Minimum — 0.12 amps per watt

User Controls — (2) External:

(1) Front-mounted rocker switch: Test;

(1) Bottom-mounted 8-position DIP switch:

Async/sync operation, data rates, clock source,

flow control

1. Specifications

MULTIMODE FOMS -ST AND -SMA

Indicators — (6) Front-mounted LEDs: TD, RD, RTS, CTS, Power,

Test

Diagnostics — Local and remote loopback

Connectors — (3) Rear-mounted:

(1) DB25 female;

(1) Barrel-type power jack;

Units with “-ST” suffix: (1) ST female;

Units with “-SMA” suffix: (1) SMA female

Power — For 120-VAC, 60-Hz operation:

From wallmount power supply:

Input: 115 VAC, 60 Hz, 100 mA;

Output: 10 VAC, 700 mA;

For 240-VAC, 50-Hz operation:

From desktop power supply:

Input: 230 VAC, 50 Hz, 100 mA;

Output: 10 VAC, 700 mA

MTBF — 125,000 hrs.

Maximum

Altitude — 10,000 ft. (3048 m)

Temperature — 32 to 140˚ F (0 to 60˚ C)

Humidity — Up to 95% noncondensing

Size — 1.5"H x 4.1"W x 5"D (3.9 x 10.5 x 12.7 cm)

Weight — 5 lb. (2.3 kg)

CHAPTER 2: Introduction

MultiMode FOMs are fiberoptic short-range modems with a special money-

saving edge. Many other fiberoptic modems can’t transmit and receive data

through the same port, so they use cables with two fibers. MultiMode FOMs

communicate with each other over a much less expensive single-fiber cable,

across distances of as much as 5 km (3.1 miles).

2.1 Features

• Synchronous or asynchronous operation

• Communicates point-to-point over a single optical fiber

• Local and remote test modes

• Asynchronous data rates up to 38.4 Kbps

• Synchronous data rates up to 256 Kbps

• Distances up to 2.5 kilometers (1.5 miles) at any speed

• Distances up to 5 kilometers (3.1 miles) at speeds of 64 Kbps or less

• Internal or external clocking

• Support for transparent hardware, or local hardware, or local software

flow control

• Available with ST®or SMA connectors

• Tri-state front-panel LED indicators

2. Introduction

MULTIMODE FOMS -ST AND -SMA

2.2 Description

The MultiMode FOM is a fiberoptic short-range modem for point-to-point

RS-232 communication over a single 62.5-µm fiber, such as one of those

bundled into our bulk multifiber cables EFN1004 and EFN1006. The FOM

supports synchronous data rates up to 256 Kbps, and asynchronous data rates

up to 38.4 Kbps. It can also support transparent hardware flow control or

local flow control; in the local setting, it automatically adapts to either

hardware or software flow control. Synchronous timing can be set for

internal or external (from attached RS-232 device) clock.

The MultiMode FOM features extended-data-rate circuitry that allows for

single-fiber distances between 1.5 and 3.1 miles (2.5 and 5 km). Depending

on which model you have, you can connect optical cable with ST or SMA

connectors to the FOM. The MultiMode FOM encodes your data signals

using 3B4B modulation, then converts them to an 880-nm optical signal.

The MultiMode FOM features two test modes: local and remote loopback.

You can activate either of these tests with the FOM’s front-panel toggle switch.

The local loopback test is used to evaluate the DTE-to-modem connection.

The remote loopback test is used to evaluate the condition of the connection

between the modems.

CHAPTER 3: Configuration

With the MultiMode FOM’s external DIP switch, you can configure the unit

for many different combinations of data rates and clocking methods for

synchronous or asynchronous applications. (Since the FOM has no internal

jumpers or other internal controls, you don’t have to open the unit’s case to

configure the unit.) Figures 3-1 and 3-2 below and Table 3-1 on the next page

show the location of the switch and the switch positions’ identities, settings,

and functions.

Figure 3-2. Closeup of the DIP switch positions showing

ON/OFF settings and position numbers.

2345678

OFF

Figure 3-1. The location of the DIP

switch on the underside of the unit.

2345678

REAR

FRONT

3. Configuration

MULTIMODE FOMS -ST AND -SMA

This section provides detailed information about the function of each

DIP switch position, and lists all possible settings. Use this section as a

configuration guide for applications where the FOM’s default settings

would not provide correct results. (Position 1 is reserved for future use.)

Positions 2 though 5: Data Rate (Sync. Mode)

Switches 2 through 5 determine two configuration parameters: synchronous

or asynchronous data rate and the mode of synchronization (Sync. Mode)

between two FOMs. Here’s how the packet-spacing option works: The “2X”

setting doubles the space between data packets compared to the “1X” setting,

so that each packet is more easily distinguishable from those before and after

it. This offsets some of the effects of signal degradation over distance, and

allows communication over as much as 5 km (3.1 miles) as opposed to the

“1X” setting’s limit of 2.5 km (1.5 miles). Table 3-2 at the top of the next

page shows every possible setting for these four switch positions.

Position 6: Reset

You can use position 6 to reset the MultiMode FOM without powering down

the unit. Move position 6 to ON to put the FOM in “reset conditon,” then

move position 6 back to OFF (the default setting) to put the FOM back in

“operating condition” (resume normal operation). Don’t leave position 6

ON: the FOM will not work properly unless this switch position is OFF.

Position Function Factory Default

1 RESERVED OFF

2 Data Rate (Sync Mode) ON

3 Data Rate (Sync Mode) OFF

4 Data Rate (Sync Mode) OFF

5 Data Rate (Sync Mode) ON

6 Reset OFF Operating Mode

7 Handshaking ON Control Signal Mode

8 Clocking Method OFF Internal Clock

0 to 19.2

Async (2X)

}

Table 3-1. Summary of Switch Settings, Showing Factory Defaults

CHAPTER 3: Configuration

Table 3-2. Possible Settings of DIP Switch Positions 2 Through 5

Pos. 2 Pos. 3 Pos. 4 Pos. 5 Data Rate (Sync. Mode)

ON OFF OFF ON Async 0 to 19.2 Kbps (2X)

ON OFF OFF OFF Async 0 to 38.4 Kbps (1X)

ON ON ON OFF Sync at 2.4 Kbps (1X)

OFF ON ON OFF Sync at 9.6 Kbps (1X)

OFF ON ON ON Sync at 9.6 Kbps (2X)

ON ON OFF OFF Sync at 19.2 Kbps (1X)

ON ON OFF ON Sync at 19.2 Kbps (2X)

OFF ON OFF OFF Sync at 38.4 Kbps (1X)

OFF ON OFF ON Sync at 38.4 Kbps (2X)

ON OFF ON OFF Sync at 48 Kbps (1X)

ON OFF ON ON Sync at 48 Kbps (2X)

OFF OFF ON OFF Sync at 56 Kbps (1X)

OFF OFF OFF OFF Sync at 64 Kbps (1X)

OFF OFF OFF ON Sync at 64 Kbps (2X)

OFF OFF ON ON Sync at 192 Kbps (1X)

ON ON ON ON Sync at 256 Kbps (1X)

Position 7: Handshake Mode

Use position 7 to set the type of flow control. (This switch position must be

moved to the same setting on both FOMs.) If position 7 is set to ON (the

default setting), the Multimode FOMs perform transparent hardware flow

control by passing the RTS/CTS and DTR/DSR signal pairs from the

attached DTEs across the modem link. In this setting, when one FOM drops

the RS-232 “RTS” signal, the other FOM drops the “CTS” signal, and when

one FOM drops the “DTR” signal, the other drops the “DSR” signal.

If position 7 is set to OFF (the “standard modem” setting), each FOM

independently performs flow control between itself and the local DTE,

automatically adapting to either hardware (RTS/CTS) or software

(X-ON/ X-OFF) flow control.

Position 8: Clock Source

Use position 8 to set the clock source. The MultiMode FOM works from an

internal clock if position 8 is set to OFF (the default setting) and provides this

clock signal on RS-232 Pin 15. The FOM receives an external clock from the

attached RS-232 device on RS-232 Pin 24 if position 8 is set to ON.

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