Black Box MX880A Manuale utente

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

AUGUST 1993

MX880A

MX880AE

MX880A-ST

MX880AE-ST

Async/Sync Fiber Optic Multiplexor

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 Classe A prescrites dans le

Règlement sur le brouillage radioélectrique publié par le ministère des

Communications du Canada.

TRADEMARKS USED IN THIS MANUAL

ST is a registered trademark of AT&T.

Freon is a registered trademark of E. I. du Pont de Nemours

& Company.

Any other trademarks mentioned in this manual are acknowledged

to be the property of the trademark owners.

ASYNC/SYNC FIBER OPTIC MULTIPLEXOR

Contents

Chapter Page

1.0 Specifications ............................................................................................. 1

2.0 Introduction ............................................................................................... 3

2.1 Description .......................................................................................... 3

2.2 Applications ......................................................................................... 4

3.0 Configuration ............................................................................................. 6

3.1 Selecting the Number of Subchannels .............................................. 7

3.2 Setting Synchronous Data Rates ........................................................ 7

3.3 Selecting the Transmit Clock (TC) Source ....................................... 7

3.4 Setting the Ground ............................................................................. 8

4.0 Installation .................................................................................................. 9

4.1 AC Power Requirements ..................................................................... 9

4.2 Main Channel ...................................................................................... 9

4.3 Subchannels ...................................................................................... 10

5.0 Operation ................................................................................................. 12

5.1 Controls and Indicators .................................................................... 12

5.2 Operating Procedure ........................................................................ 13

5.3 System Tests ....................................................................................... 13

6.0 Troubleshooting ...................................................................................... 15

6.1 Front-Panel Indicators Don’t Light ................................................. 15

6.2 Local Sync Loss LED Is ON .............................................................. 15

6.3 Remote Sync Loss LED Is ON .......................................................... 16

6.4 Calling Your Supplier ....................................................................... 17

6.5 Shipping and Packaging ................................................................... 17

CHAPTER 1: Specifications

Approvals — FCC Class A, DOC Class/MDC classe A

Multiplexing

Technique — Time division

User Channels — (6); (12) with Doubler Cable (EYN356)

Interface — Channel: Serial EIA RS-232C/CCITT V.24, DCE;

Composite: Dual fiberoptic

Protocols — On 3 or 9 channels: Asynchronous only;

On 3 channels: Asynchronous or synchronous

(user-selectable)

Clock — Internal, external from DTE, or external from

remote modem (user-selectable)

Operating Mode — Full duplex over dual fiberoptic cable

Speeds — Channel: Asynchronous: Transparent to all speeds

up to 38,400 bps; Synchronous: 1200, 2400, 4800,

9600, or 19,200 bps (user-selectable);

Composite: 2.46 Mbps

Operating Range — 3.2 mi. (5.2 km)

Operating

Wavelength — 820 nm

Optical Output — -23 dBm minimum into 50/125 G. I. fiber;

-16 dBm minimum into 100/140 G. I. fiber

Receiver

Sensitivity — -40 dBm minimum

Dynamic Range — 24 dBm minimum

1.0 Specifications

ASYNC/SYNC FIBER OPTIC MULTIPLEXOR

User Controls — (8): (2) Front-mounted pushbuttons: Local Loopback,

Remote Loopback; (6) Internal: (3) Jumpers: Number

of Channels, Clock Source, Connected/Disconnected

Grounds; (3) Rotary Switches: Synchronous Data

Rate/Asynchronous for Channels 1 through 3

Indicators — (4) Front-panel LEDS: Power, Test, Local Sync Loss,

Remote Sync Loss

Diagnostics — Local and remote digital loopback

Connectors — (9) Rear-mounted: (6) DB25 female; (1) Power inlet;

Units without “-ST” suffix: (1 TX, 1 RX) SMA 905

female;

Units with “-ST” suffix: (1 TX, 1 RX) ST®female

Leads/Signals

Supported — RS-232: 1, 2, 3, 4, 5, 6, 7, 8, 15, 17, 20, 24 (PGD, TXD,

RXD, RTS, CTS, DSR, SGD, DCD, TXCLK, RXCLK,

DTR, and EXTCLK respectively)

Power — From outlet over 5-ft. (1.5-m) detachable line cord:

Consumption: 8.5 VA maximum;

For 120-VAC, 60-Hz operation:

Input range: 115 VAC ±10%, 47 to 63 Hz;

For 240-VAC, 50-Hz operation:

Input range: 230 VAC ±10%, 47 to 63 Hz

Fuse — Slo-Blo: For 120 VAC: 0.2 A; For 240 VAC: 0.1 A

Temperature — 32 to 122˚F (0 to 50˚C)

Humidity — Up to 95%, noncondensing

Size — Standalone: 1.75"H x 13.3"W x 7.9"D (4.4 x 33.8 x 20 cm)

Rackmount: 1.75"H x 19"W x 7.9"D (4.4 x 48.3 x 20 cm)

Weight — Standalone: 3.5 lb. (1.6 kg)

Rackmount: 3.85 lb. (1.75 kg)

CHAPTER 2: Introduction

2.1 Description

The Async/Sync Fiber Optic Multiplexor is a full-duplex time-division

synchronous/asynchronous multiplexor that enables up to 12 terminals to be

multiplexed onto a single fiberoptic channel. (The mux’s normal total of six

subchannels can be increased to 12 by using channel-doubler cables, product

code EYN356.) Channels 1 through 3 can be set to operate either synchron-

ously or asynchronously, while the remaining three or nine channels always

operate asynchronously.

Various configurations can be set up to suit your specific needs:

• Up to six asynchronous data channels with one control signal per channel

at data rates up to 19,200 bps. (A control signal is the same as hardware

flow control.) This signal, input to the local unit on Pin 14 (STXD,

Secondary Transmitted Data), is transposed at the remote unit and

output on Pin 16 (SRXD, Secondary Received Data). The control signal

may require special cabling; the mux can process it only in 6-channel (not

12-channel) mode at up to 19,200 (not more) bps.

• Up to six asynchronous data channels without control signals at rates

up to 38,400 bps. (Distortion increases at async speeds above 19,200 bps,

preventing the use of control signals.)

• Up to six data channels: up to three operating synchronously at rates

up to 19,200 bps and the rest operating asynchronously, with no control

signals, at rates up to 38,400 bps.

• Up to 12 data channels: up to three operating synchronously and the

rest operating asynchronously, with no control signals, all at rates up to

19,200 bps.

These configurations are set by adjusting the rotary switches and jumpers

located on the main board (see Chapter 3).

The unit implements asynchronous multiplexing using an over-sampling

technique. Each of the 12 channels is sampled at 76.8 kbps on the electrical

side while on the optical side the rate of sampling is doubled. Table 2-1 on the

next page summarizes the unit’s performance in its various configurations.

2.0 Introduction

ASYNC/SYNC FIBER OPTIC MULTIPLEXOR

2.2 Applications

The primary application of the Async/Sync Fiber Optic Multiplexor is for

point-to-point configurations where distances of up to several kilometers are

involved. For example, where a cluster of terminals is connected to a host

computer through a single link, as in Figure 2-1 below:

Table 2-1. Performance in Various Configurations

Total # of Max. # Subchannels Data Rate Distortion (%) Controls per

Subchannels In Use (kbps) (Async Channels) Subchannel

Sync Async Sync Async

6 3 6 minus sync 19.2 19.2 6.25 0

6 3 6 minus sync 19.2 38.4 12.5 0

6 3 6 minus sync 19.2 19.2 12.5 1

12 3 12 minus sync 19.2 19.2 12.5 0

NOTE: To reduce async distortion, operate the multiplexor in the 6-channel mode, at no more

than 19,200 bps, whenever possible. There is no distortion on sync channels in any mode.

Figure 2-1. Typical point-to-point installation.

HOST

CHAPTER 2: Introduction

For installations involving clusters of terminals distributed in several

locations, the Async/Sync Fiber Optic Multiplexor units may be installed

in a ring-type (multipoint) arrangement, as shown below in Figure 2-2.

Figure 2-2. Typical ring (multipoint) installation.

On each terminal-end mux in a ring arrangement, the unconnected channels

must be bypassed by shorting Pin 2 to Pin 3 of the relevant subchannels’

connectors. During synchronous operation, if a bypass is needed for a given

unit’s Channel 1, 2, or 3, the transmit-clock source in that unit should be set

to “received clock” (RX; see Section 3.3). Not more than two adjacent units

should operate in the RX mode.

ASYNC/SYNC FIBER OPTIC MULTIPLEXOR

Four setup procedures must be completed before the multiplexor can

be installed and operated: selecting the number of subchannels, setting

synchronous data rates, selecting the transmit clock (TC) source, and setting

the ground. Refer to the board layout in Figure 3-1, below, for the location

of the straps (jumpers) and switches referred to in the rest of this chapter.

3.0 Configuration

Figure 3-1. Internal strap and switch locations.

CHAPTER 3: Configuration

3.1 Selecting the Number of Subchannels

1. Unscrew the two upper-cover screws located at the back of the unit and

slide the upper cover backward.

2. Locate the strap labeled “SELECT 6 OR 12 CHANNELS.”

3. For up to 6 channels with no controls, place the strap between the center

pin and the one marked “6.” For any other application, place the strap

between the center pin and the one marked “12.”

3.2 Setting Synchronous Data Rates

1. With the cover off the multiplexor, locate the three rotary data-rate

switches marked “CH.1,” “CH.2,” and “CH.3,” and the rate table located

to the left of these switches.

2. If you want to operate Channel 1, 2, or 3 in the synchronous mode, you

must rotate the channel switch(es) to the appropriate data-rate setting(s)

(refer to the rate table). If the synchronous mode isn’t needed, set the

three switches to positions 5, 6, or 7 (asynchronous mode).

3.3 Selecting the Transmit Clock (TC) Source (Synchronous Operation Only)

1. With the cover still off the multiplexor, locate the strap marked “TC

SOURCE.”

2. For normal synchronous operation (the Transmit-Clock signal is

generated internally), place the strap over the “IN” column of pins.

For loopback timing (the TC is synchronized to the Received-Clock signal

from the remote modem), place the strap over the “RX” column of pins.

If an External-Clock signal is provided by a DTE device on RS-232 Pin 24,

place the strap over the “EX” column of pins. Only Channel 1 can accept

an External Clock.

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