Black Box MD640A-ST-R2, MD640A-SMA-R2, MD640AE-ST-R2, MD640AE-SMA-R2 User Manual

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 [phone]
Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: [e-mail]

FEBRUARY 1996

MD640A-ST-R2

MD640A-SMA-R2

MD640AE-ST-R2

MD640AE-SMA-R2

MultiMode FOMs -ST and -SMA

MultiMode FOM

Test

Modes

POWER

TD RD CDRTS

Remote

Normal

Local

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.

1

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), user­selectable

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

2

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)

3

CHAPTER 2: Introduction

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