Patton electronics 1140RC User Manual

USER
MANUAL

MODEL 1140RC

RS-232 Fiber Optic
Rack Card Modem
w/ V.54 & V.52 Diagnostics

SALES OFFICE
[phone]
TECHNICAL SUPPORT
[phone]
http://www.patton.com

Part #07M1140RC-C
Doc #018031UC
Revised 6/6/97

CERTIFIED

An ISO-9001

Certified Company

Dear Valued Customer,

Thank you for purchasing Patton Electronics products! We do

appreciate your business. I trust that you find this user manual helpful.

We manufacture one of the widest selections of data
communications products in the world including CSU/DSU's, network
termination units, powered and self-powered short range modems, fiber optic
modems, interface converters, baluns, electronic data switches, data-line surge
protectors, multiplexers, transceivers, hubs, print servers and much more. We
produce these products at our Gaithersburg, MD, USA, facility, and can
custom manufacture products for your unique needs.

We would like to hear from you. Please contact us in any of the
following ways to tell us how you like this product and how we can meet your
product needs today and in the future.

Web: http://www.patton.com

Sales E-mail: [e-mail]

Support E-mail: [e-mail]

Phone - Sales [phone]

Phone - Support [phone]

Fax: [phone]

Mail: Patton Electronics Company

7622 Rickenbacker Drive
Gaithersburg, MD 20879 USA

We are committed to a quality product at a quality price. Patton
Electronics is BABT and ISO 9001 certified. We meet and exceed the highest
standards in the industry (CE, UL, etc.).

It is our business to serve you. If you are not satisfied with any
aspect of this product or the service provided from Patton Electronics or its
distributors, please let us know.

Thank you.

Burton A.Patton

Vice President

P.S. Please tell us where you purchased this product.

_________________________________________________________
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1.0 WARRANTY INFORMATION

Patton Electronics warrants all Model 1140RC 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 Patton 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. Patton 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 1140RC 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 1140RC 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
1140RC does cause interference to radio or television reception, which
can be determined by turning the power off or removing the card, 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). In the event the
user detects intermittent or continuous product malfunction due to
nearby high power transmitting radio frequency equipment, the user is
strongly advised to take the following steps: use only data cables with
an external outer shield bonded to a metal or metalized connector; and,
configure the rear card as shown in section 3.2 of this manual.

1.2 CE NOTICE

The CE symbol on your Patton Electronics equipment indicates
that it is in compliance with the Electromagnetic Compatibility (EMC)
directive and the Low Voltage Directive (LVD) of the Union European
(EU). A Certificate of Compliance is available by contacting Technical
Support.

1

1.3 SERVICE

All warranty and nonwarranty repairs must be returned freight
prepaid and insured to Patton Electronics. All returns must have a
Return Materials Authorization number on the outside of the shipping
container. This number may be obtained from Patton Electronics
Technical Support: [phone]; http://www.patton.com; or,

[e-mail].

NOTE: Packages received without an RMA number will not be

accepted.

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

through Friday.

2

3.0 CONFIGURATION

This section describes the location and orientation of the Model
1140RC’s configuration switches and jumpers, and provides detailed
instructions for all possible settings.

The Model 1140RC uses a combination of DIP switches and
jumpers that allow configuration to an extremely wide range of
applications. Designed around a mid-plane architecture, the Model
1140RC incorporates both front and rear cards. Configuration of both
may be necessary. The switches/jumpers are accessible when the
cards are removed from the rack chassis. Once configured, the Model
1140RC is designed to operate transparently, without need for frequent
re-configuration.

3.1 FRONT CARD CONFIGURATION

The Model 1140RC front card has two sets of eight switches (S1 &
S2), which are mounted on the PC board (Figure 1, below). These
configuration switches allow you to configure the Model 1140RC for a
wide range of applications. The ON/OFF orientation of the DIP
switches is shown in figure 2 (below).

2.0 GENERAL INFORMATION

Thank you for your purchase of this Patton Electronics product.
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 Patton Electronics Technical Support at [phone],

[e-mail] or www.patton.com.

2.1 FEATURES

• Supports async or sync communication over dual optical fibers

• RS-232 Data rates to 57.6 Kbps

• Distances to 2 miles

• V.54 and V.52 Diagnostics

• Mounts in Patton’s 16-Card Rack Chassis

• Compatible with the Patton Model 1140 self-powered modem

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

• Easily accessible configuration jumpers & switches

• Bi-level LED status indicators

• Works with switchable 120V or 240V rack mount power supply

• SMA or ST connectors available (HD-26 female RS-232 port) on
rear Interface card

2.2 DESCRIPTION

The Patton Model 1140RC fiber optic rack card modem is the

rack mountable counterpart to Patton’s Model 1140 self-powered, fiber
optic modem. Communicating full or half duplex over dual optical
fibers, the Model 1140RC supports data rates to 57.6 Kbps and
distances to 2 miles. Both V.54 and V.52 diagnostics are built into the
unit. Like all fiber optic modems, the Model 1140RC 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”. Five pairs of bi-level LED indicators monitor TD,
RD, RTS, CD, test and error. A single LEDmonitors power.

The Model 1140RC is designed to mount in Patton’s 2U high 19”
rack chassis. This 16-card chassis has a switchable 120/240 volt
power supply and mounts cards in a mid-plane architecture: The front
“brains” half-card can be plugged into different rear “interface” cards.
The Model 1140RC is available with a choice of two interface cards:
one with SMA connectors, and one with ST connectors. Both cards are
equipped with an HD-26 female connector for the RS-232 interface.

3 4

Figure 1. Model 1140RC front card jumper locations

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

12345678

ON

OFF

ON

Switch Set 1

(Switch 1:1 on bottom)

SwitchSet 2

(Switch 2:1 on bottom)

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 1140RC.

S1-5 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 1140RC

is in asynchronous or synchronous operating mode.

S1-7 Setting

On Asynchronous
Off Synchronous

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, multipoint and/or hardware handshaking
applications.

S1-8 Setting

Off Constantly On
On Switched Carrier

3.1.1 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. Following the table is a description of all possible S­1 switch settings.

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 1140RC.

S1-1

S1-2 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

5 6

S1 SUMMARY TABLE

Position Function Factory Default

S1-1 Data Rate On
S1-2 Data Rate Off
S1-3 Data Rate Off
S1-4 Data Rate On
S1-5 Clock Source On
S1-6 Clock Source On
S1-7 Async./Sync. On Async.
S1-8 Carrier Control Off Constantly On

9,600 bps

Internal

}

}

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 1140RC “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..

S2-8 Setting

Off V.54 Enable

On V.54 Disable

3.2 REAR CARD CONFIGURATION

The Model 1140RC is compatible with two dual-fiber interface cards,
one with dual ST connectors and one with dual SMA connectors. Both
cards use an HD-26 female for the RS-232 interface. The single
configuration jumper (JB1) functions identically on both cards. Figure 3
(below) shows the jumper’s location.

3.1.2 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. The default settings
are summarized in the table below. Following the table is a description
of all possible S-2 switch settings.

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

S2-3: Extended Signaling Rate

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

S2-3 Setting

Off -2.5% to +1% Basic
On -2.5% to +2.3% Extended

87

Figure 3. Model 1140RC rear card jumper location

JB1

(pin 1 on left)

S2 SUMMARY TABLE

Position Function Factory Default

S2-1 Word Length Off
S2-2 Word Length Off
S2-3

Extended Signaling Rate

Off-2.5% to +2.3%
S2-4 RTS/CTS Delay On
S2-5 RTS/CTS Delay On
S2-6 Future Use ­S2-7 Future Use ­S2-8 V.52/V.54 Tests Off

Enable

}

}

7 mS

10 bits

9

10

3.2.1 HOW THE JUMPER WORKS

Figure 4 (below) shows the 3-pin jumpers used on the rear card.
The strap enables or disables a particular function depending upon
whether it straddles pins 1 and 2, or pins 2 and 3.

DTE Shield (Pin 1) & FRGND (JB1)

In the connected (closed) position, this strap links DB-25 pin 1 and
frame ground. In the open (disconnected) position, pin 1 is “lifted” from
frame ground.

JB1
Position 1&2 = DTE Shield (Pin 1) and FRGND connected
Position 2&3 = DTE Shield (Pin 1) and FRGND not connected

4.0 INSTALLATION

This section describes the functions of the Model 1000R16 rack
chassis, tells how to install front and rear Model 1140RC cards into the
chassis, and provides instructions for connecting the interface cables.

4.1 THE MODEL 1000R16 RACK CHASSIS

The 1000R16 Rack Chassis (Figure 5, below) has sixteen short
range modem card slots, plus its own power supply. Measuring only

3.5” high, the 1000R16 is designed to occupy only 2U in a 19” rack.
Sturdy front handles allow the 1000R16 to be extracted and transported
conveniently.

4.1.1 THE RACK POWER SUPPLY

The power supply included in the Model 1000R16 rack uses the
same mid-plane architecture as the modem cards. The front card of
the power supply slides in from the front, and the rear card slides in
from the rear. They plug into one another in the middle of the rack.
The front card is then secured by thumb screws and the rear card by
conventional metal screws.

Figure 4. Orientation of interface card strap

123 123 123

Figure 5. Model 1000R16 rack chassis with power supply

WARNING! There are no user-serviceable parts in the power

supply section of the Model 1140RC. Voltage setting changes
and fuse replacement should only be performed by qualified
service personnel. Contact Patton Electronics Technical
support at [phone], http://www.patton.com, or
[e-mail] for more information.

4.3 WIRING UP THE MODEL 1140RC

Both of the rear interface cards compatible with the Model 1140RC
have one RS-232 port and one dual-connector fiber port (see Figure 6.
below). Depending upon the card you have, the fiber port will be either
an ST or SMA connector. The RS-232 port is always a female HD-26
connector.

4.3.1 RS-232 CONNECTION

The RS-232 port on the rear card of the Model 1140RC is wired as
a DCE, and uses a female HD-26 connector. The HD-26 is an alternate
connector according to the EIA RS-232E specification, and the pin-out
is the same as a standard DB-25. Pin 26 is not used.

You will need an interface cable to connect the Model 1140RC to
your RS-232 device. Assuming your RS-232 device is a DTE (PC,
host, terminal, workstation, etc.), the cable should be wired

straight

through

. You may either provide your own cable, or you may purchase
an HD-26 to DB-25 cable from Patton Electronics Company. Please
call the Patton Sales Department at [phone] for price and
delivery information.

Switching the Power Supply On and Off

The power supply on/off switch is located on the front panel. When
plugged in and switched on, a red front panel LED will glow. Since the
Model 1000R16 is a “hot swappable” rack,

it is not necessary for any

cards to be installed before switching on the power supply

. The power
supply may be switched off at any time without harming the installed
cards.

NOTE: Please refer to the Model 1000RP Series User Manual

AC

and DC Rack Mount Power Supplie

s for fuse and power card

replacement information.

4.2 INSTALLING THE MODEL 1140RC INTO THE CHASSIS

The Model 1140RC is comprised of a front card and a rear card.
The two cards meet inside the rack chassis and plug into each other via
mating 50 pin card edge connectors. Use the following steps as a
guideline for installing each Model 1140RC into the Model 1000R16
rack chassis:

1. Slide the rear card into the back of the chassis along the metal

rails.

2. Secure the rear card using the metal screws provided.

3. Slide the front card into the front of the chassis. It should meet the

rear card when it’s almost all the way into the chassis.

4. Push the front card

gently

into the card-edge receptacle of the rear

card. It should “click” into place.

5. Secure the front card using the thumb screws.

NOTE: Since the Model 1000R16 chassis allows “hot swapping”

of cards, it is

not necessary to power down

the rack when you

install or remove a Model 1140RC.

1211

Dual SMA

Dual ST

Figure 6. Model 1140RC interface card options

A1

TX

RX

A1

TX

RX

HD-26 F

HD-26 F

Notice! Any terminal cable connected to the Model 1140RC

must be shielded cable, and the outer shield must be 360
degree bonded–at both ends–to a metal or metalized backshell.

13

5.0 OPERATION

Once you have configured each Model 1140RC and connected the
cables, you are ready to operate the units. This section describes the
LED status monitors and power-up procedure.

5.1 LED STATUS MONITORS

The Model 1140RC features ten front panel status LEDs that
indicate the condition of the modem and communication link:

• The green “PWR” LED glows when power is applied to the modem

card through its mid-plane chassis connection.

• The green “TD” and “RD” indicators blink to show positive state

data activity. The Red “TD” and “RD” indicators blink to show
negative state data activity. Solid red indicates an idle state.

• The green “RTS” and “CD” indicators glow solid to show the control

signal is on. The red “RTS” and “CD” indicators glow solid to show
the control signal is off. When the 1140RC is connected to a DTE,
RTS will glow green for an incoming signal on RS-232 pin 4. CD
will glow green for an incoming signal from the line, and an
outgoing signal on RS-232 pin 8.

• The “Test” LED glows when either the Local Analog Loopback

(LAL) or Remote Digital Loopback (RDL) V.54 test mode is
initiated. The “Error” LED blinks when an error is detected by the
V.52 diagnostics.

5.2 POWER-UP

There is no power switch on the Model 1140RC: Power is
automatically applied to the 1140RC when its card-edge connector
makes contact with the chassis’ mid-plane socket, or when the chassis’
power supply is turned on.

Note: The 1140RC is a “hot swappable”
card—it will not be damaged by plugging it in or removing it while the
rack is powered up.

When the local and remote units are

both

powered up, and are

passing data

normally

, the following LED conditions will exist:

• PWR = green

• TD & RD = flashing red and green

• RTS & CD = green

• Test = off

• Error = off
14

4.3.2 FIBER CONNECTIONS

The Model 1140RC is designed to work with the self-powered
Model 1140, or with another Model 1140RC. In either case, you will
need one unit at each end of a dual

fiber cable. This cable connects to
the Model 1140RC using either ST or SMA connectors. Figure 7
(below) shows a close-up of each of these connector types.

Figure 7. Close up of ST and SMA connections

ST

SMA

alignment pin
faces down

15 16

5.3 TEST MODES

The Model 1140RC offers two V.54 test modes and two V.52 test
modes to evaluate the condition of the modems and the communication
link. Both sets of tests can be activated physically from the front panel.
The V.54 test can also be activated from the RS-232 interface.

Note:
V.54 and V.52 test modes on the Model 1140RC are available for point­to-point applications only.

5.3.1 LOCAL ANALOG LOOPBACK (LAL)

The Local Analog Loopback (LAL) test checks the operation of the

local Model 1140RC, and is

performed separately on each unit.

Any
data sent to the local Model 1140RC 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:

1. Activate LAL. This may be done in one of two ways: First, by
moving the upper front panel toggle switch RIGHT to “Analog”.
Second, by raising pin 18 on the RS-232 interface (note: be
sure DIP switch S2-8 is off). Once LAL is activated, the Model
1140RC transmit output is connected to its own receiver. The
“Test” LED should be lit.

2. Verify that the data terminal equipment is operating properly
and can be used for a test.

3. Locate the lower of the two toggle switches on the front panel
of the Model 1140RC and move it to the right. This will
activate the V.52 BER test mode and inject a “511” test pattern
into the local loop. If any errors are present in the loop, the
red “Error” LED will blink sporadically.

4. If the BER test indicates

no errors

are present, move the V.52
toggle switch to the left, thus activating the “511/E” test with
periodic errors. If the test is working properly, the red “Error”
LED will light. A successful “511/E” test will confirm that the
loop is in place, and that the Model 1140RC’s built-in “511”
generator and detector are working properly.

5. If the BER test indicates that errors

are

present, check to see
that the RS-232 cable connecting the DTE to the Model
1140RC is wired straight through, and is plugged in properly.
Also, ensure that the Model 1140RC is configured properly.
Then re-check your DTE equipment. If you still have errors,
call Patton Technical Support at [phone].

5.3.2 REMOTE DIGITAL LOOPBACK (RDL)

The Remote Digital Loopback (RDL) test checks the performance of

both the local and remote Model 1140RCs,

and

the communication link
between them. Any characters sent to the remote 1140RC 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

1140RC and looped back. To perform an RDL test, follow these steps:

1. Activate RDL. This may be done in two ways: First, by
moving the upper front panel toggle switch LEFT to “Remote”.
Second, by raising pin 21 on the RS-232 interface. (Note: be
sure DIP switch S2-8 is off).

2. Verify that the DTE equipment on the local end is operating
properly and can be used for a test.

3. Locate the lower of the two toggle switches on the front panel
of the 1140RC and move it to the right. This will activate the
V.52 BER test mode and inject a “511” test pattern into the
remote loop. If any errors are present in the loop, the red
“Error” LED will blink sporadically.

4. If the BER test indicates

no errors

are present, move the V.52
toggle switch to the left, thus activating the “511/E” test with
periodic errors. If the test is working properly, the red “Error”
LED will light. A successful “511/E” test will confirm that the
loop is in place, and that the Model 1140RC’s built-in “511”
generator and detector are working properly.

5. If the remote BER test indicates that errors

are

present, and
the local analog loopback/BER tests showed that both Model
1140RCs were functioning properly, this suggests a problem
with the twisted pair communication line connecting the two
modems. A common problem is improper crossing of the
pairs. Also, verify that the modular connections are pinned
properly, and the twisted pair line has continuity. If you still
have errors, call Technical Support at [phone].

5.3.3 USING THE V.52 BER TEST INDEPENDENTLY

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

APPENDIX A

SPECIFICATIONS

Transmission Line: Dual optical cable
Transmission Mode: Asynchronous, half or full duplex, point-to-point
Interfaces: EIA RS-232, CCITT V.24
Data Rates: 0 - 57.6 Kbps
Distance: 2 miles over continuous fiber
RTS/CTS Delay: Switch-selectable: No delay, 7.0 mS, 53 mS
Receiver Sensitivity: -45 dBm
Coupled Power Output: -30 to -36 dBm
Optic Wavelength: 850 nm
LED Indicators: Power, TD, RD, RTS, CD, Test Mode, Error
Connectors: HD-26 female on RS-232 side; ST or SMA connectors

on fiber side

Power Supply: 120/240V (switchable) on rack chassis
Temperature Range: 0-60°C (32-140°F)
Altitude: 0-15,000 feet
Humidity: Up to 95% non-condensing
Weight: 2 oz.
Dimensions: 0.95”W x 3.1”H x 5.4”L

17 18

1. Locate the lower of the two toggle switches on the front panel
of the Model 1140RC and move it to the right. This will
activate the V.52 BER test mode and transmit 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 independent test to function, the “511” switch on

both

Model 1140RCs must be turned on.

2. If the test indicates no errors are present, move the V.52
toggle switch to the left, thus activating the “511/E” test with
periodic errors present. If the test is working properly, the
receiving modem’s red “Error” LED will blink

regularly

. A
successful “511/E” test will confirm that the link is in place, and
that the Model 1140RC’s built-in “511” generator and detector
are working properly.

APPENDIX C

PIN CONFIGURATIONS

APPENDIX B

FACTORY REPLACEMENT PARTS

The Patton Model 1140RC rack system features interchangeable
rear half cards, power cords/fuses for international various operating
environments and other user-replaceable parts. Model numbers and
descriptions for these parts are listed below:

Patton Model # Description

1000RPEM..........................120/240V Rear Power Entry Module

1000RPSM-2.......................120/240V Front Power Supply Module

1000RPEM-DC ...................DC Rear Power Entry Module

1000RPSM-48A..................48V Front Power Supply Module

1000RPEM-V......................120/240V CE Compliant Rear Power

Entry Module

1000RPSM-V......................120/240V CE Compliant Front Power

Supply Module

0805US...............................American Power Cord

0805EUR.............................European Power Cord CEE 7

0805UK...............................United Kingdom Power Cord

0805AUS.............................Australia/New Zealand Power Cord

0805DEN.............................Denmark Power Cord

0805FR ...............................France/Belgium Power Cord

0805IN.................................India Power Cord

0805IS.................................Israel Power Cord

0805JAP..............................Japan Power Cord

0805SW ..............................Switzerland Power Cord

05R16FPB1.........................Single Width Blank Front Panel

05R16FPB4.........................4-Wide Blank Front Panel

05R16RPB1........................Single Width Blank Rear Panel

05R16RPB4........................4-Wide Blank Rear Panel

0821R4................................400 mA Fuse (5x20mm)

Littlefuse 239.400 or equivalent

0821R2................................200 mA Fuse (5x20mm)

Littlefuse 239.200 or equivalent

056S1..................................Set of 16 #4 pan head screws/washers

19 20

8- (CD) Carrier Detect
7- (SG) Signal Ground
6- (DSR) Data Set Ready
5- (CTS) Clear to Send
4- (RTS) Request to Send
3- (RD) Receive Data
2- (TD) Transmit Data
1- (FG) Frame Ground

UNIVERSAL D-26 INTERFACE (DCE WIRING)

Digital Loop (RDL) -21

Data Terminal Ready (DTR) -20

Analog Loop (LAL) -18

APPENDIX D

BLOCK DIAGRAM

Copyright ©

Patton Electronics Company

All Rights Reserved

MODEL 1140RC

BLOCK DIAGRAM

21