B&B Electronics 1140 User Manual

Not Recommended for New Installations.

Please contact Technical Support for more information.

Miniature Fiber Optic Modem

With V.54 Diagnostics

Model 1140

Documentation Number 11401198

B&B Electronics Mfg. Co. Inc.

707 Dayton Road -- P.O. Box 1040 -- Ottawa, IL 61350

PH [phone] -- FAX [phone]

Internet:

http://www.bb-elec.com

[e-mail]

[e-mail]

B&B Electronics -- March 1998

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Table of Contents

1.0 WARRANTY INFORMATION ................................ 1

1.1 RADIO AND TV INTERFERENCE.........................................1

1.2 SERVICE................................................................................2

2.0 GENERAL INFORMATION .................................. 3

2.1 FEATURES ...........................................................................3

2.2 DESCRIPTION......................................................................3

3.0 CONFIGURATION OVERVIEW............................. 4

3.1 CONFIGURATION SWITCHES.............................................4

3.2 CONFIGURATION SWITCH SET "S1" .................................5

S1-1 through S1-4: Data Rate Setting......................................6

S1-5 and S1-6: Clock Source ...................................................6

S1-7: Asynchronous/Synchronous Mode .................................6

S1-8: Carrier Control Method ...................................................7

3.3 CONFIGURATION SWITCH SET "S2" .................................7

S2-1 and S2-2: Word Length....................................................7

S2-3: Extended Signaling Rate ................................................8

S2-4 and S2-5: RTS/CTS Delay...............................................8

S2-8: V.54 Loopback Test Enable............................................8

4.0 INSTALLATION..................................................... 9

4.1 FIBER CONNECTIONS .........................................................9

4.2 RS-232 CONNECTION..........................................................9

5.0 OPERATION........................................................ 10

5.2 TEST MODES......................................................................10

5.2.1 LOCAL ANALOG LOOP BACK (LAL) ...........................10

5.2.2 REMOTE DIGITAL LOOPBACK (RDL).........................11

5.2.3 USING THE V.52 BER TEST INDEPENDENTLY.........12

5.3 POWER UP .........................................................................12

APPENDIX A: SPECIFICATIONS ............................ 13

APPENDIX B. PIN CONFIGURATIONS................... 14

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1.0 WARRANTY INFORMATION

B&B Electronics warrants all Model 1140 components to be free
from defects, and will, at our option, repair or replace the product
should it fail within one year from the first date of shipment.
This warranty is limited to defects in workmanship or materials, and
does not cover customer damage, abuse or unauthorized
modification. If this product fails or does not perform as warranted,
your sole recourse shall be repair or replacement as described
above. Under no condition shall B&B Electronics be liable for any
damages incurred by the use of this product. These damages
include, but are not limited to, the following: lost profits, lost savings
and incidental or consequential damages arising from the use of or
inability to use this product. B&B Electronics specifically disclaims all
other warranties, expressed or implied, and the installation or use of
this product shall be deemed an acceptance of these terms by the
user.

1.1 RADIO AND TV INTERFERENCE

The Model 1140 generates and uses 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 and television reception. The Model 1140 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 from
such interference in a commercial installation. However, there is no
guarantee that interference will not occur in a particular installation.
If the Model 1140 does cause interference to radio or television
reception, which can be determined by disconnecting the RS-232
interface, the user is encouraged to try to correct the interference by
one or more of the following measures: moving the computing
equipment away from the receiver, re-orienting the receiving
antenna and/or plugging the receiving equipment into a different AC
outlet (such that the computing equipment and receiver are on
different branches).

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1.2 SERVICE

All warranty and non-warranty repairs must be returned freight
prepaid and insured to B&B Electronics. All returns must have a
Return Materials Authorization number on the outside of the
shipping container. This number may be obtained from B&B
Electronics Customer Service at [phone]. Packages received
without an RMA number will not be accepted.

B&B Electronics' technical staff is also available to answer any
questions that might arise concerning the installation or use of your
Model 1140. Technical Service hours: 8AM to 5PM CST, Monday
through Friday.

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2.0 GENERAL INFORMATION

Thank you for your purchase from B&B Electronics. This product
has been thoroughly inspected and tested and is warranted for One
Year parts and labor. If any questions or problems arise during
installation or use of this product, please do not hesitate to contact
B&B Electronics Technical Support at [phone].

2.1 FEATURES

• Supports async. or sync. communication over dual optical fibers

• V.52 and V.54 diagnostics

• Data rates to 38.4 Kbps

• Range to 2 miles

• Immune to RFI/EMI noise, ground loops and transient surges

• Easily accessible Diagnostic & Configuration Switches

• Jumper-selectable carrier control

• Requires no AC power or batteries

• Two easy-to-read status indicators

• Male or female DB-25 and SMA or ST connectors available

2.2 DESCRIPTION

The B&B Model 1140 miniature dual fiber optic modem brings
fiber to the desktop. Combining the inviolability of fiber with the
troubleshooting capabilities of V.52 and V.54 diagnostics, the Model
1140 is the best choice for your most critical RS-232 links. The
Model 1140 operates async. or sync., supports data rates to 38.4
Kbps and plugs directly into a workstation's RS-232 port. Like all
fiber optic modems, the Model 1140 is inherently immune to
RFI/EMI noise, ground loops and transient surges. The carrier may
be switch selected as either "Continuously On" or "Controlled by
RTS". The RS-232 connector is configured as DCE.

Two easy-to-read LED indicators monitor the Error and Test
modes. Drawing all necessary power from the RS-232 interface, the
Model 1140 requires no AC power or batteries to operate.
Measuring only 3.42" x 2.10" x .73", the Model 1140 is able to fit into
tight installation spaces. On the RS-232 side, the Model 1140 comes
equipped with either a male or female DB-25 connector; on the fiber
side it is available with a choice of SMA or ST connectors.

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3.0 CONFIGURATION OVERVIEW

The Model 1140 is fairly simple to install and is ruggedly
designed for excellent reliability: just set it and forget it. The
following instructions will help you set up and install the Model 1140
properly. If you have any questions, don't hesitate to call B&B’s
Technical Support Department at [phone] (8-5 PM, CST).

3.1 CONFIGURATION SWITCHES

The Model 1140 uses a unique set of 16 external mini DIP
switches that allow configuration to an extremely wide range of
applications. These 16 DIP switches are grouped in two eight-switch
sets, and are externally accessible from the underside of the Model
1140 (see Figure 1). Since all configuration DIP switches are
externally accessible, there is no need to open the Model 1140's
case for configuration.

The configuration switches allow you to select data rates,
clocking methods, V.52 & V54 tests, word lengths, extended
signaling rates, async. or sync. mode. The drawings, text and tables
on the following pages describe all switch locations, positions and
functions.

Figure 1. Model 1140 Configuration Switches External Position

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The Model 1140 has two sets of eight switches, yielding 16 total
DIP switches. The three sets will be referred to as S1 and S2. As
Figure 2 shows, the orientation of all DIP switches is the same with
respect to "ON" and "OFF" positions.

Figure 2. Close-up of DIP switches showing “ON” and “OFF” positions

3.2 CONFIGURATION SWITCH SET "S1"

The DIP switches on S1 set data rate, clock source,
async./sync. mode and carrier control method. The default settings
are summarized in the table below.

Figure 3. Summary of DIP switch default settings for set S1

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S1-1 through S1-4: Data Rate Setting

Switches S1-1 through S1-4 are set in combination to determine
the asynchronous and synchronous data rate for the Model 1140.

S1-1 S 1-2 S1-3 S1-4 Setting

On On On On 1.2 Kbps
Off On On On 1.8 Kbps
On Off On On 2.4 Kbps
Off Off On On 3.6 Kbps
On On Off On 4.8 Kbps
Off On Off On 7.2 Kbps
On Off Off On 9.6 Kbps
Off Off Off On 14.4 Kbps
On On On Off 19.2 Kbps
Off On On Off 28.8 Kbps
On On Off Off 38.4 Kbps
Off On Off Off 57.6 Kbps

S1-5 and S1-6: Clock Source

Switches S1-5 and S1-6 are set in combination to determine the
transmit clock source for the Model 1140.

SI-5

S1-6 Setting
On On Internal transmit clock
Off On Receive recover clock
On Off External transmit clock

S1-7: Asynchronous/Synchronous Mode

The setting for switch S1-7 determines whether the Model 1140

is in asynchronous or synchronous operating mode.

Setting

S1-7
On Asynchronous

Off Synchronous

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S1-8: Carrier Control Method

The setting for switch S1-8 determines whether the carrier is

"constantly on" or "controlled by RTS

". This setting allows for
operation in switched carrier, rnultipoint and/or hardware
handshaking applications.

Setting

S1-8
Off Constantly On
On Switched Carrier

3.3 CONFIGURATION SWITCH SET "S2"

The DIP switches on S2 set word length, extended signaling

rate, RTS/CTS delay and V.52 and V.54 diagnostic test.

Figure 4. Summary of DIP switch default settings for S2

S2-1 and S2-2: Word Length

Switches S2-1 and S2-2 are set in combination to determine the

word length for asynchronous data.

S2- 1

S2-2 Setting
Off On 8 bits
On On 9 bits
Off Off 10 bits
On Off 11 bits

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S2-3: Extended Signaling Rate

The setting for switch S2-3 determines the range of variability
the Model 1140 "looks for" in asynchronous data rates (i.e., the
actual variance from a given frequency level the Model 1140 will
tolerate).

Setting

S2-3

Off -2.5% to +1% Basic

On -2.5% to +2.3% Extended

S2-4 and S2-5: RTS/CTS Delay

The combined settings for switches S2-4 and S2-5 determine
the amount of delay between the time the Model 1140 "sees" RTS
and when it sends CTS. Options are no delay, 7 ms and 53 ms.

S2-4

S2-5 Setting
On On 7 mS
Off On 53 mS
On Off No delay
Off Off No delay

S2-8: V.54 Loopback Test Enable

To reset the V.54 circuit, set switch S2-6 to the "ON" position,

then back to the "OFF" position.

Setting

S2-8
Off V.54 Enable

On V.54 Disable

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4.0 INSTALLATION

The Model 1140 is easy to install. After configuring the DIP
switches, simply connect the two fiber cables and then connect the
RS-232 interface. Figure 5 shows the location of the fiber
connections on the Model 1140's rear panel.

Figure 5. Close-up of ST and SMA connections

4.1 FIBER CONNECTIONS

The Model 1140 short range modems are designed to work in
pairs. You will need one at each end of a dual fiber cable. This cable
connects to each Model 1140 using either an ST or SMA connector.
Figure 6 shows a close up of each of these connector types.

Figure 6. Close-up of ST and SMA connections

4.2 RS-232 CONNECTION

Because the Model 1140 is designed to behave as either a DCE
or a DTE device, it does not need special cables to operate. Always
use a straight-through RS-232 cable.

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5.0 OPERATION

Once you have configured each Model 1140 properly and
connected the fiber and RS-232 cables, you are ready to operate the
units. This section describes the LED status monitors, the V.52 and
V.54 diagnostics and the power up process.

5.2 TEST MODES

The Model 1140 offers two V.54 test modes to evaluate the
condition of the modems and the communication link. These tests
can be activated physically from the front panel, or via the interface.
NOTE: V.54 test modes on the Model 1140 are available for
point-to-point applications only.

5.2.1 LOCAL ANALOG LOOP BACK (LAL)

The Local Analog Loopback (LAL) test checks the operation of
the local Model 1140, and is performed separately on each unit. Any
data sent to the local Model 1140 in this test mode will be echoed
(returned) back to the user device. For example, characters typed
on the keyboard of a terminal will appear on the terminal screen. To
perform a LAL test, follow these steps:

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A. Activate LAL. This may be done in one of two ways: First, by
moving the front panel toggle switch DOWN to "LAL". Second, by
raising pin 18 on the interface. (NOTE: Make sure DIP switch
SW1-8 is OFF). Once LAL is activated, the Model 1140 transmit
output is connected to its own receiver. The "test" LED should be lit.

B. Verify that the data terminal equipment is operating properly
and can be used for a test. If a fault is indicated, call a technician or
replace the unit.

C. Perform a BER (bit error rate) test on each unit. If the BER
test equipment indicates no faults, but the data terminal indicates a
fault, follow the manufacturer's checkout procedures for the data
terminal. Also, check the interface cable between the terminal and
the Model 1140.

5.2.2 REMOTE DIGITAL LOOPBACK (RDL)

The Remote Digital Loopback (RDL) test checks the
performance of both the local and remote Model 1140s, and the
communication link between them. Any characters sent to the
remote Model 1140 in this test mode will be returned back to the
originating device. For example, characters typed on the keyboard of
the local terminal will appear on the local terminal screen after
having been passed to the remote Model 1140 and looped back. To
perform an RDL test, follow these steps:

A. Activate RDL. This may be done in two ways: first, by moving
the front panel toggle switch UP to "RDL". Second, by raising pin 21
on the interface. (NOTE: Make sure SW1-8 is OFF).

B. Perform a BER (bit error rate) test on the system.

C. If the BER test equipment indicates a fault, and the Local
Analog Loopback test was successful for both Model 1140s, you
may have a problem with the twisted pair line between the modems.
You should then check the fiber line for proper connections and
continuity.

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5.2.3 USING THE V.52 BER TEST INDEPENDENTLY

The V.52 BER test can be used independently of the V.54
loopback tests. This requires two operators: one to initiate and
monitor the test at the local Model 1140, and one at the remote
Model 1140. To use the V.52 BER test by itself, both operators
should simultaneously follow these steps:

1. Locate the "511/511 E" toggle switch on the front panel of the
1140 and move it DOWN. This activates the V.52 BER test mode
and transmits a "511" test pattern to the other unit. If any errors are
present, the receiving modem's red "Error" LED will blink
sporadically. NOTE: For this test to function, the "511" switch on
both Model 1140s must be on.

2. If the test indicates no errors are present, move the V.52
toggle switch UP, activating the "511/E" test with errors present. If
the test is working properly, the receiving modem's red "Error" LED
will glow. A successful "511/E" test will confirm that the link is in
place, and that the Model 1140's built-in "511" generator and
detector are working properly.

5.3 POWER UP

Once the Model 1140 is properly installed, it should operate
transparently—as if it were a standard cable connection. Since
operating power is derived from the RS-232 data and control
signals; there is no "ON/OFF" switch. All data signals from the
RS-232 interface are passed straight through.

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APPENDIX A: SPECIFICATIONS

Transmission Line: Dual optical cable

Transmission Mode: Async. or sync., half or full duplex

Interfaces: EIA RS-232, CCITT V.24

Data Rates: 0 - 38.4 Kbps

Distance: 2 miles over continuous fiber

RTS/CTS Delay: Switch-selectable: No delay, 9.0 mS, 79.5 mS

Receiver Sensitivity: -45 dBm

Coupled Power Output: -30 to -36 dBm

Optic Wavelength: 850 nm

LED Indicators: Carrier Detect and Fiber Optic Output

Connectors: DB-25 male or female on RS-232 side; ST or SMA

connectors on fiber side

Power Supply: No external power required; uses power from

RS-232 data and control signals

Temperature Range: 0-60°C (32-140°F)

Altitude: 0-15,000 feet

Humidity: Up to 95% non-condensing

Weight: 2 oz.

Dimensions: 23.42" x 2.10" x 0.73"

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APPENDIX B: PIN CONFIGURATIONS

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