Comtech EF Data SDR-54A User Manual

SDR-54A

Satellite Demodulator

Installation and Operation Manual

Part Number MN/SDR54A.IOM Revision 4

Comtech EF Data is an ISO 9001

Registered Company.

SDR-54A

Satellite Demodulator

Installation and Operation Manual

Part Number MN/SDR54A.IOM

Revision 4

July 10, 2003

i

Customer Support

Contact the Comtech EF Data Customer Support Department for:

Product support or training
Information on upgrading or returning a product
Reporting comments or suggestions concerning manuals

A Customer Support representative may be reached at:

Comtech EF Data
Attention: Customer Support Department
2114 West 7th Street
Tempe, Arizona 85281 USA

480.333.2200 (Main Comtech EF Data Number)

480.333.4357 (Customer Support Desk)

480.333.2161 FAX

or, E-Mail can be sent to the Customer Support Department at:

[e-mail]

Contact us via the web at www.comtechefdata.com

1. To return a Comtech EF Data product (in-warranty and out-of-warranty) for
repair or replacement:

2. Request a Return Material Authorization (RMA) number from the Comtech EF
Data Customer Support Department.

3. Be prepared to supply the Customer Support representative with the model
number, serial number, and a description of the problem.

4. To ensure that the product is not damaged during shipping, pack the product in
its original shipping carton/packaging.

5. Ship the product back to Comtech EF Data. (Shipping charges should be
prepaid.)

For more information regarding the warranty policies, see, p. xiv.

.

ii

Table of Contents

CHAPTER 1. INTRODUCTION................................................................................. 1–1

1.1 Demodulator Functions .............................................................................................................................1–1

1.2 Overview......................................................................................................................................................1–2

1.3 Options ........................................................................................................................................................1–4

1.4 New in this Revision ...................................................................................................................................1–4

CHAPTER 2. INSTALLATION................................................................................... 2–1

2.1 Unpacking ...................................................................................................................................................2–1

2.2 System Installation .....................................................................................................................................2–2

CHAPTER 3. EXTERNAL CONNECTORS ............................................................... 3–1

3.1 External Connections ................................................................................................................................. 3–1

3.1.1 RF Input (J1)........................................................................................................................................3–2

3.1.2 Fault Connector (J2) ............................................................................................................................3–3

3.1.3 M&C Port (J3) ..................................................................................................................................... 3–3

3.1.3.1 Rear Panel Connector Pinout ...................................................................................................... 3–3

3.1.3.2 Front Panel Connector Pinout.....................................................................................................3–4

3.1.4 Data Out Connector (J4) Interface Type Jumpers ..............................................................................3–4

3.1.4.1 Data Out Connector (J4) Jumper Location .................................................................................3–5

3.1.4.2 Data Out Connector (J4) .............................................................................................................3–5

3.1.4.3 Data Out Connector (J4) .............................................................................................................3–6

3.1.5 Power Entry .........................................................................................................................................3–6

3.1.5.1 AC Option...................................................................................................................................3–6

3.1.5.2 48 VDC Option...........................................................................................................................3–7

3.1.5.3 24 VDC Option...........................................................................................................................3–7

3.1.6 Ground (GND).....................................................................................................................................3–7

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CHAPTER 4. OPERATION........................................................................................ 4–1

4.1 Front Panel..................................................................................................................................................4–1

4.1.1 Indicators .............................................................................................................................................4–2

4.1.2 LNB Power .......................................................................................................................................... 4–2

4.2 Configuration Setup ...................................................................................................................................4–2

4.3 Cooling Fan.................................................................................................................................................4–3

CHAPTER 5. DEMUX OPTION ................................................................................. 5–1

5.1 DEMUX Overview ..................................................................................................................................... 5–1

5.2 DEMUX 2/4-Channel (Option) .................................................................................................................5–2

5.2.1 Description...........................................................................................................................................5–2

5.2.2 Installation ...........................................................................................................................................5–3

5.2.3 DEMUX 2/4-Channel Specification....................................................................................................5–5

5.2.4 Tributary Data Interface Connector RS-422 (J4) ................................................................................5–5

5.3 DEMUX 8-Channel (Option).....................................................................................................................5–7

5.3.1 Description...........................................................................................................................................5–7

5.3.2 Installation ...........................................................................................................................................5–8

5.3.3 DEMUX 8-Channel Specification.....................................................................................................5–10

5.3.4 Tributary Data Interface Connector RS-422 (J5 and J6) ...................................................................5–11

CHAPTER 6. REED-SOLOMON ............................................................................... 6–1

6.1 Introduction ................................................................................................................................................6–1

6.2 Descrambler ................................................................................................................................................ 6–2

6.3 Deinterleaver...............................................................................................................................................6–3

6.4 Reed-Solomon Codec ................................................................................................................................. 6–4

6.5 Reed-Solomon Installation.........................................................................................................................6–4

6.6 Functionality ...............................................................................................................................................6–6

6.6.1 Correlator............................................................................................................................................. 6–6

6.6.2 Error Detection ....................................................................................................................................6–6

6.7 BER Performance.......................................................................................................................................6–7

6.7.1 Specification ........................................................................................................................................6–8

6.7.2 Interface Connector .............................................................................................................................6–9

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CHAPTER 7. FULLY ACCESSIBLE SYSTEM TOPOLOGY (FAST)........................ 7–1

7.1 FAST Accessible Options...........................................................................................................................7–1

7.2 FAST System Theory .................................................................................................................................7–1

7.3 Implementation...........................................................................................................................................7–2

CHAPTER 8. SPECIFICATIONS............................................................................... 8–1

8.1 Specifications .............................................................................................................................................. 8–1

8.1.1 Prime Power Interface .........................................................................................................................8–3

8.1.2 Desired Carrier Input Power................................................................................................................8–3

8.1.3 Composite to Desired Input Power...................................................................................................... 8–3

8.1.4 IF Input Shape .....................................................................................................................................8–3

8.1.5 Adjacent Channel Interface Performance............................................................................................ 8–4

8.1.6 Frequency Stability..............................................................................................................................8–4

8.2 Digital Data Rates ..................................................................................................................................8–4

8.2.1 Demodulator and FEC Decoding Types..............................................................................................8–5

8.2.2 BPSK and QPSK BER Performance with Noise................................................................................. 8–5

8.2.3 QPSK and BPSK Performance with Noise and Reed-Solomon..........................................................8–5

8.3 Carrier and Clock Acquisition Time....................................................................................................8–7

8.3.1 Received IF Carrier Acquisition Range............................................................................................... 8–7

8.3.2 Received Data Clock Frequency Error ................................................................................................8–7

8.4 Signal Level for Antenna Pointing ............................................................................................................. 8–8

8.5 Unit-to-Unit Dalay Variation.....................................................................................................................8–8

8.6 Monitor and Control (M&C) Specification .............................................................................................8–9

8.6.1 M&C Interface Connector(s).............................................................................................................8–10

8.6.2 M&C Interface Configurtion .............................................................................................................8–10

8.6.3 M&C Communications......................................................................................................................8–10

8.6.4 M&C Message Formats.....................................................................................................................8–10

8.7 Monitored Signals.....................................................................................................................................8–10

8.8 Faults Monitored ......................................................................................................................................8–11

8.9 System Status ............................................................................................................................................ 8–11

8.10 Space Link Remote Control (SLRC) Specifications.............................................................................. 8–12

8.11 Integrated Demultiplexer Option............................................................................................................ 8–13

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8.12 8-Channel Demux (SP/5839) (Comtech EF Data) .................................................................................8–14

8.12.1 Specifications.....................................................................................................................................8–14

8.12.2 Tributary Data Connector (J3)...........................................................................................................8–15

8.12.3 Tributary Data Connector (J4)...........................................................................................................8–16

8.12.4 Aggregate Data/Clock Input, Power Connector ................................................................................8–17

8.12.5 Mode and SYNC Connector..............................................................................................................8–17

8.12.6 Secondary Demodulator Interface Connector....................................................................................8–17

8.13 Reed-Solomon Option ..............................................................................................................................8–18

APPENDIX A. REMOTE CONTROL OPERATION ...................................................A–1

A.1 General...................................................................................................................................................A–1

A.2 Message Structure................................................................................................................................. A–1

A.2.1 Start Character ....................................................................................................................................A–2

A.2.2 Device Address................................................................................................................................... A–2

A.2.3 Command/Response ...........................................................................................................................A–3

A.2.4 End Character .....................................................................................................................................A–3

A.3 Configuration Commands/Responses ................................................................................................. A–4

A.3.1 Demodulator .......................................................................................................................................A–4

A.4 Status Commands/Responses...............................................................................................................A–7

A.5 DEMUX Commands/Responses ........................................................................................................ A–10

A.6 Interface Configuration Status ..........................................................................................................A–11

GLOSSARY .................................................................................................................g-1

INDEX ...........................................................................................................................i-1

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Figures

Figure 1-1. SDR-54A Desktop Unit.........................................................................................................................1–2

Figure 1-2. SDR-54A Rack Mount Unit ..................................................................................................................1–2

Figure 2-1. Interconnect Diagram ............................................................................................................................2–2

Figure 3-1. SDR-54A Desktop Unit (Rear and Front Panel) ...................................................................................3–2

Figure 3-2. SDR-54A Rack Mount Unit (Rear and Front Panel)............................................................................. 3–2

Figure 3-3. Data Out (J4) Interface Jumpers ............................................................................................................3–4

Figure 3-4. RS-530 Jumper Location (J4)................................................................................................................3–5

Figure 4-1. SDR-54A Desktop Unit (Front Panel)...................................................................................................4–1

Figure 4-2. SDR-54A Rack Mount Unit (Front Panel) ............................................................................................4–1

Figure 5-1. DEMUX 2/4 PCB .................................................................................................................................. 5–2

Figure 5-2. Installation of DEMUX 2/4 Card...........................................................................................................5–4

Figure 5-3. DEMUX 8-Channel PCB.......................................................................................................................5–7

Figure 5-4. Installation of DEMUX 8-Channel Card ...............................................................................................5–9

Figure 6-1. Reed-Solomon Card...............................................................................................................................6–1

Figure 6-2. V.35 Self-Synchronizing Descrambler .................................................................................................. 6–2

Figure 6-3. R-S Code Word Format ......................................................................................................................... 6–3

Figure 6-4. Installation of Reed-Solomon Card (AS/6285)......................................................................................6–5

Figure 6-5. Reed-Solomon Decoder Section Block Diagram...................................................................................6–7

Figure 6-6. BER Performance with Noise, Viterbi Decoder, and Reed-Solomon (Optional).................................. 6–8

Figure 8-1. BPSK and QPSK BER Performance .....................................................................................................8–6

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Tables

Table 3-1. External Connectors................................................................................................................................3–1

Table 3-2. RF Input (J1) Specification .....................................................................................................................3–2

Table 3-3. Fault Connector 9-Pin D Sub Female .....................................................................................................3–3

Table 3-4. Rear Panel Connector Pinouts................................................................................................................. 3–3

Table 3-5. Front Panel Connector Pinouts................................................................................................................3–4

Table 3-6. Data Interface Connector 25-Pin D Sub..................................................................................................3–5

Table 3-7. Data Interface Connector (RS-232) 25-Pin D Sub.................................................................................. 3–6

Table 3-8. AC Option ............................................................................................................................................... 3–6

Table 3-9. 48 VDC Option .......................................................................................................................................3–7

Table 3-10. 24 VDC Option .....................................................................................................................................3–7

Table 4-1. Indicators.................................................................................................................................................4–2

Table 5-1. Summary of DEMUX Specification .......................................................................................................5–5

Table 5-2. Tributary Data Interface Connector (RS-422) ........................................................................................5–5

Table 5-3. Tributary Data Interface Connector (RS-232) 25-Pin D Sub (Female) ..................................................5–6

Table 5-4. DEMUX 8-Channel Specification .......................................................................................................5–10

Table 5-5. Monitor & Control Additions................................................................................................................5–11

Table 5-6. Tributary Data Interface Connector (J5) ...............................................................................................5–11

Table 5-7. Tributary Data Interface Connector (J6) ...............................................................................................5–12

Table 5-8. Aggregate Data and Clock ....................................................................................................................5–12

Table 6-1. R-S Codes ...............................................................................................................................................6–4

Table 6-2. BER PErformance Curve Data................................................................................................................6–7

Table 6-3. Reed-Solomon Specifications .................................................................................................................6–8

Table 6-4. Interface Connector.................................................................................................................................6–9

Table 8-1. Demodulator Specifications ....................................................................................................................8–1

Table 8-2. Environmental and Physical Specification..............................................................................................8–2

Table 8-3. Digital Data Rates ...................................................................................................................................8–4

Table 8-4. Demodulator and FEC Decoding Types .................................................................................................8–5

Table 8-5. BPSK and QPSK BER Performance.......................................................................................................8–5

Table 8-6. BPSK and QPSK BER Performance.......................................................................................................8–5

Table 8-7. Carrier and Clock Acquisition Time .......................................................................................................8–7

Table 8-8. Monitor and Control Specifications ........................................................................................................8–9

Table 8-9. Aggregate Data/Clock Input and Power Connector (J3).......................................................................8–14

Table 8-10. 8-Channel Demux Specifications........................................................................................................8–14

Table 8-11. Tributary Data Connector (J3) ...........................................................................................................8–15

Table 8-12 Tributary Data Connector (J4) ............................................................................................................8–16

Table 8-13. Aggregate Data/Clock Inpout, Power Connector................................................................................8–17

Table 8-14. Mode and SYNC Connector (JP2)......................................................................................................8–17

Table 8-15. Secondary Demodulator Interface Connector ..................................................................................... 8–17

Table 8-16. Reed-Solomon Specifications .............................................................................................................8–18

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Preface

About this Manual

This manual provides installation and operation information for the Comtech EF Data
SDR-54A satellite demodulator. This is a technical document intended for earth station
engineers, technicians, and operators responsible for the operation and maintenance of the
SDR-54A.

Conventions and References Used in this Manual

Cautions and Warnings

CAUTION indicates a hazardous situation that, if not avoided, may result in
minor or moderate injury. CAUTION may also be used to indicate other

CAUTION

WARN ING

IMPORTANT

unsafe practices or risks of property damage.

WARNING indicates a potentially hazardous situation that, if not avoided,
could result in death or serious injury.

IMPORTANT indicates a statement that is associated with the task
being performed. .

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Trademarks

Product names mentioned in this manual may be a trademark or registered trademarks of
their respective companies and are hereby acknowledged.

Metric Conversion

Metric conversion information is located on the inside back cover of this manual. This
information will assist the operator in cross-referencing English to Metric conversions.

Related Documents

The following documents are referenced in this manual:

• Comtech EF Data Specification SP/5231, SOS 2/4 Channel Demux

• Comtech EF Data Specification SP/5487 SLRC - Space Link Remote Control

• Comtech EF Data Specification SP/5839 Comtech EF Data 8-Channel Demux

• Comtech EF Data Specification SP/6258 SDM-300A (Reed-Solomon)

• Comtech EF Data Specification SP/6537, SDR-54A L-Band Demodulator

Overview of Changes to Previous Edition

Changes made to Revision 3 include:

Total revision and reformat.
Added FW/5445-1K Verison: 4.2.4

Reporting Comments or Suggestions Concerning this Manual

Comments and suggestions regarding the content and design of this manual will be
appreciated. To submit comments, please contact the Comtech EF Data Customer
Support Department according to the information in the following section.

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SDR-54A Satellite Demodulator Revision 4
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Warranty Policy

This Comtech EF Data product is warranted against defects in material and workmanship
for a period of 1 year from the date of shipment. During the warranty period, Comtech EF
Data will, at its option, repair or replace products that prove to be defective.

For equipment under warranty, the customer is responsible for freight to Comtech EF
Data and all related custom, taxes, tariffs, insurance, etc. Comtech EF Data is responsible
for the freight charges only for return of the equipment from the factory to the customer.
Comtech EF Data will return the equipment by the same method (i.e., Air, Express,
Surface) as the equipment was sent to Comtech EF Data.

Limitations of Warranty

The foregoing warranty shall not apply to defects resulting from improper installation or
maintenance, abuse, unauthorized modification, or operation outside of environmental
specifications for the product, or, for damages that occur due to improper repackaging of
equipment for return to Comtech EF Data.

No other warranty is expressed or implied. Comtech EF Data specifically disclaims the
implied warranties of merchantability and fitness for particular purpose.

Exclusive Remedies

The remedies provided herein are the buyer's sole and exclusive remedies. Comtech EF
Data shall not be liable for any direct, indirect, special, incidental, or consequential
damages, whether based on contract, tort, or any other legal theory.

Disclaimer

Comtech EF Data has reviewed this manual thoroughly in order that it will be an easy-to­use guide to your equipment. All statements, technical information, and recommendations
in this manual and in any guides or related documents are believed reliable, but the
accuracy and completeness thereof are not guaranteed or warranted, and they are not
intended to be, nor should they be understood to be, representations or warranties
concerning the products described. Further, Comtech EF Data reserves the right to make
changes in the specifications of the products described in this manual at any time without
notice and without obligation to notify any person of such changes.

If you have any questions regarding your equipment or the information in this manual,
please contact the Comtech EF Data Customer Support Department.

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This page is intentionally left blank.

xii

Chapter 1. Introduction

This chapter describes the SDR-54A satellite demodulator, hereinafter referred to as
“the demodulator.”

Two versions of the SDR-54A are available:

• Desktop (Figure 1-1)

• Rack Mount (Figure 1-2)

1.1 Demodulator Functions

For the purposes of this document, a demodulator will consist of a device having the
following functions:

• Perform filtered QPSK or BPSK demodulation from carriers of variable
frequencies/amplitudes.

• Decode the data.

• Descramble the data.

• Provide Terrestrial data interface.

• Provide Monitor and Control interface for remote operation.

• Maintain full functionality of SDM-51, SDM-52, and all their respective

configurations.

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Figure 1-1. SDR-54A Desktop Unit

1.2 Overview

The demodulator provides all necessary functions for accepting L-Band digital data
transmissions, extracting the data, and providing it to the user in a standard serial data
format.

The demodulator is composed of four units:

♦ L-Band digital demodulator
♦ DEMUX (optional)
♦ L-Band low noise block (LNB) converter (required)
♦ Reed-Solomon (optional)

The demodulator is available as either a desktop or rack mount unit. The demodulator may
be located away from the LNB, provided the interconnecting cable losses do not reduce
the signal to below the minimum discernible level of the demodulator (typically
30 dB of loss, dependent on the receive signal level).

The demodulator provides all necessary functions for converting an RF modulated data
carrier input into a digital synchronous data output.

Figure 1-2. SDR-54A Rack Mount Unit

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Introduction MN/SDR54A.IOM

The LNB converter is mounted directly to the antenna and preserves received signal-to­noise while providing gain and frequency down conversion. This feature minimizes signal
degradation between the antenna site and demodulator. An appropriate LNB must be used
in order to properly operate the demodulator. LNB primary power is provided by the
demodulator via the coaxial signal interconnect. See Chapter 8 for LNB specification
information.

ully compatible LNB is available from Comtech EF Data. Contact Comtech EF

IMPORTANT

Data Customer Support representative for more information.

L-Band input frequencies are tunable from 950 to 1550 MHz, in graduated steps of
10 kHz. The demodulator will lock to a carrier within the frequency stability range of the
receive system (± 500 kHz), and will perform coherent detection for QPSK and BPSK
modulation.

Forward Error Correction (FEC) is provided by the demodulator’s integrated Viterbi
decoder, which can support 1/2, 3/4, and 7/8 rate coding, along with the optional
Reed-Solomon.

Digital data output is selectable between synchronous RS-232 or RS-422 format. Data
rates from 4.8 to 1250 kbps for BPSK and 9.6 to 4000 kbps for QPSK. The demodulator is
compatible with the following:

• INTELSAT open network filtering

• Comtech EF Data closed network filtering

• SDM-51, -52

Monitor and control of the demodulator is provided by a user-accessible RS-232 serial
port. Once configured, power may be removed for at least 1 year and reapplied without
loss of configuration.

The demodulator incorporates features for remote configuration over the satellite channel
using Comtech EF Data’s Space Link Remote Control (SLRC) protocol.

For more information about the SLRC, refer to the Comtech EF Data Space Link Remote

Control System User’s Guide.

Provisions for optional demultiplexers are as follows:

• Option 1: Synchronous/symmetrical DEMUX 2- or 4-channel. Maximum tributary
data rates of :

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Introduction MN/SDR54A.IOM

 128 kbps in the 2-channel mode.
 64 kbps in the 4-channel mode.

• Option 2: Synchronous/asymmetrical DEMUX 8-channel demultiplexer with
maximum tributary data rate of 4000.0 kbps.

Notes:

1. When using the optional DEMUX 2/4-daughter card, the data output will be in
RS-422 format only.

2. When using the optional DEMUX 8-Channel daughter card, the data output is
software selectable to RS-422 or RS-232.

Refer to Chapter 5 for additional information about DEMUX options.

1.3 Options

• Rack mounted or desktop configurations

• 48 VDC input power

• 24 VDC input power

• 2- or 4-channel synchronous DEMUX (SP/5231 SOSOFT)

• 4- or 8-channel synchronous DEMUX (SP/5839 Comtech EF Data)

• Reed-Solomon Concatenated Codec IESS 308/309 (SP/6285)

1.4 New in this Revision

Incorporated FW/5445-1K, version 4.2.4.
Replaced company name to Comtech EF Data.

1–4

This chapter provides unpacking, installation instructions.

2.1 Unpacking

The demodulator and manual are packaged in pre-formed reusable cardboard cartons
containing foam spacing for maximum shipping protection.

To remove the unit from the box, proceed as follows:

CAUTION

1. Cut the tape at the top of the carton, where it is labeled “OPEN THIS END.”

2. Lift out the cardboard/foam spacer covering the demodulator.

3. Remove the demodulator, manual, and power cord from the carton.

4. Save the packing material for reshipment.

5. Inspect the equipment for damage incurred during shipment.

6. Ensure the shipment is complete by checking the equipment against the packing
list shipped with the equipment.

7. Refer to Section 2.2 for system installation instructions.

Chapter 2. Installation

To avoid damage to the unit, do not use any cutting tool, which will extend
more than 1 inch into the container.

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2.2 System Installation

Note: The demodulator is configured at the factory. Use the remote control interface on the
front or rear panel to alter the configuration. For information on configuration and remote
control, refer to Appendix A.

After unpacking the system as outlined in Section 2.1, install the system as follows:

1. Attach an LNB converter to the antenna and connect one end of the
LNB/demodulator interconnecting cable to the LNB coaxial output.

2. Refer to Figure 2-1 prior to cabling the demodulator, the output data port must be
configured for the appropriate interface: RS-232 or RS-422.

a. The interface is configured as RS-422 at the factory.

b. If RS-232 is required, remove the demodulator cover, locate the jumpers of

JP8 (directly behind the DATA OUT connector), and reposition , as outlined
in Chapter 3.

CLK/

DATA

OUT

EIA-422 OR

EIA-232

CLK/

DATA

OUT

EIA-422 OR

EIA-232

REMOTE

SERIAL

INTERFACE

EIA-232

FRONT PANEL
M&C REMOTE

SERIAL INTERFACE

EIA-232

J6

J5

J4

J3

DEMUX
OPTION EFD
8-CHANNEL

DEMUX

OPTION EFD

24-CHANNEL

DATA

INTERFACE

MONITOR

&

CONTROL

CLK

REED-SOLOMON

OPTION

COMMAND BUS

DATA

CLK

DEMOD

CODE

POWER
SUPPLY

+24 VDC

L-BAND

IF INPUT

1.5A

90 TO 264 VAC:

47 TO 63 Hz

J1

950 TO 1550 MHz

-30 TO -80 dBm

Figure 2-1. Interconnect Diagram

3. Connect the AC power cord and turn on the demodulator. The front panel
POWER indicator should illuminate and the FAULT indicator should be off.

4. Configure the demodulator. Refer to Appendix A for specific demodulator
configuration information.

L-BAND

LNB

WAVEGUIDE

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Demodulation frequency, rate, and reacquisition time are defined as follows:

Term Definition

Frequency Carrier frequency of the desired channel
Rate Data rate of the desired channel
Reacquisition Time Time delay from incidental carrier loss until the modem initiates

carrier search

Note: The above values, when set, are retained by the demodulator until changed by the
user. Once the demodulator is configured and operating, the terminal is no longer
required.

Once configured, the demodulator will perform an acquisition search for the desired
channel. If a signal is present at a sufficient level, the CARRIER DETECT indicator on
the front panel will illuminate. Data will be present at the DATA OUT serial port, if the
detected signal can be demodulated and decoded.

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Notes:

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2–4

Chapter 3. External Connectors

This chapter provides a description of external connections.

3.1 External Connections

Connections between the demodulator and other equipment are made through external
connectors. These connectors are listed in Table 3-1, and their locations are shown in
Figure 3-1 and Figure 3-2. The use of each connector is described in the following
paragraphs.

Table 3-1. External Connectors

Ref. Desig. Name Type Function

J1 RF INPUT F coax LNB input/LNB power
J2 FAULT 9-pin D External Fault Status
J3 M&C 9-pin D Configuration and Status (RS-232)

J4 DATA OUT (RX Data) 25-pin D RS-232 or RS-422 Selectable
*J5 DEMUX T1 through T4 25-pin D DEMUX Outputs T1 through T4
*J6 DEMUX T5 through T8 25-pin D DEMUX Outputs T5 through T8

None M&C REMOTE 9-pin D Remote Configuration and Status
None PRIME POWER Standard AC Power Input
None GND #10-32 Chassis Ground

*Note: J5 and J6 are optional.

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Figure 3-1. SDR-54A Desktop Unit (Rear and Front Panel)

Figure 3-2. SDR-54A Rack Mount Unit (Rear and Front Panel)

3.1.1 RF Input (J1)

Refer to Table 3-2 for RF Input (J1) specification.

Table 3-2. RF Input (J1) Specification

Parameter Specification

Connector type
Return loss -8 dB or greater from 950 to 1550 MHz

3.1.1.1 L-Band RF Input

This is a type F female coaxial connector for signal input to the demodulator unit from the
LNB. This connector also provides DC power to the LNB along the center conductor, with
the shield as the return.

F Type (Female) 75Ω

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3.1.2 Fault Connector (J2)

A fault connection occurs when any of the indicators in the demodulator fault status
command show a fault condition.

Refer to Table 3-3 for Fault connector specifications.

Table 3-3. Fault Connector 9-Pin D Sub Female

Pin # Signal Function Name

1 Ground GND
2 FORM C Normally Closed FCNC
3 FORM C Common FCC
4 FORM C Normally Open FCNO
8 TTL OPEN Collector TTL-OC

Note: A connection between FCNO (pin 4) and FCC (pin 3) indicates no fault.

3.1.3 M&C Port (J3)

The M&C port enables the user to exercise the control and status commands listed in
Appendix A. The port is accessible from either the front or rear panel. Only one of these
ports may be used at a time.

3.1.3.1 Rear Panel Connector Pinout

The M&C port is provided on a 9-pin female D connector. Screw locks are provided for
mechanical security of the mating connector. This connector is a DCE interface. Pinouts are
described in Table 3-4:

Table 3-4. Rear Panel Connector Pinouts

Pin # Signal Function Name

2 Receive data output (RS-232-C) RX
3 Transmit data input (RS-232-C) TX

5 Ground GND
*7 Request to send input (RS-232-C) RTS
*8 Clear to send output (RS-232-C) CTS

9 AGC Analog 0 to 5 VDC at 10 mA AGC

*Note: RTS and CTS are internally connected together.

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3.1.3.2 Front Panel Connector Pinout

The M&C port is provided on a 9-pin female D connector. Screw locks are provided for
mechanical security of the mating connector. This connector is a DCE interface. Pinouts are
described in Table 3-5:

Table 3-5. Front Panel Connector Pinouts

Pin # Signal Function Name

1 +5 VDC at 100 mA +5

2 Receive data output (RS-232-C) RX

3 Transmit data input (RS-232-C) TX

5 Ground GND
*7 Request to send input (RS-232-C) RTS
*8 Clear to send output (RS-232-C) CTS

9 AGC Analog 0 to 5 VDC at 10 mA AGC

*Note: RTS and CTS are internally connected together.

3.1.4 Data Out Connector (J4) Interface Type Jumpers

The J4 port is the interface between the demodulator and the user’s terrestrial equipment.
This port may be configured internally as an RS-232 or RS-422 interface, as required, by
removing the modem cover and positioning the jumpers of JP3 (Figure 3-3), as follows:

2216 16

OPEN

1

Figure 3-3. Interface Type Jumper Location (JP3)

Notes:

1. If optional DEMUX 2/4 PCB is installed, position jumpers for RS-422 operation.

2. If optional DEMUX 8-Channel PCB is installed, refer to Chapter 5.

OPEN

JUMP

JUMP

EIA-422

OPEN

JUMP

JUMP

JUMP

15

1

OPEN

JUMP

JUMP

OPEN

OPEN

JUMP

EIA-232

OPEN

OPEN

15

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3.1.4.1 Data Out Connector (J4) Pinout Jumper Location

The pinout configuration for the Data Out Connector (J4) can be set for:

• Standard (SDR-54A, SDM-51/-52 compatible)

• EIA-530

This is accomplished by removing the cover and positioning the jumper blocks at JP4 and
JP5 to the appropriate positions. Refer to Figure 3-4 for EIA-530 jumper location.

J4

JP4

Pinout Jumper Blocks

JP3

RS232/

RS422

JP5

Figure 3-4. Data Pinout Jumper Location (JP4/JP5)

3.1.4.2 Data Out Connector (J4)

Refer to Table 3-6 for data interface connector specifications. This table reflects a
non-DEMUX operation.

Table 3-6. Data Interface Connector 25-Pin D Sub

Standard RS-422 EIA-530

DB25M (J4)

Pin #

3 RX Data A (-) 3

4 RX Data B (+) 16
17 RX Clock A (-) 17
18 RX Clock B (+) 9

CD/RR A (-) 8

20 CD/RR B (+) 10

DM A (-) 6
DM B (-) 22
DF 21

7 SIG GND 7

SHLD GND 1

Signal Name

Standard

EIA-530

DB25M (J4)

Pin#

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3.1.4.3 Data Out Connector (J4)

Refer to Table 3-7 for data interface connector specifications.

Table 3-7. Data Interface Connector (EIA-232)

25-Pin D Sub

Standard EIA-432 EIA-530

DB25M (J4)

Pin #

3 RX Data 3

17 RX Clock 17

8 CD/RR 8

N/A DM 6

7 SIG GND 7

N/A SHLD GND 1

Signal Name

DB25M (J4)

Pin #

Note: Table 3-7 reflects non-DEMUX operation.

3.1.5 Power Entry

3.1.5.1 AC Option

The AC power is supplied to the demodulator by a standard, detachable, non-locking,
3-prong power cord. Refer to Table 3-8 for the required specifications.

Parameter Specification

Connector Type I.E.C.
Input Power 40W maximum.
Input Voltage 90 to 132VAC, or 175 to 264 VAC. Unit switches

Fuse Protection
(internal on power supply)

Table 3-8. AC Option

ranges automatically.

3.15A slo-blo.
Line and neutral fusing.
5mm type fuse.

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3.1.5.2 48 VDC Option

Table 3-9. 48 VDC Option

Parameter Specification

Connector Type 20A 3-way screw-type terminal block.
Input Power 40W maximum.
Input Voltage 46 to 50 VDC.
Fuse Protection
(internal on power supply)

2A slo-blo.

3.1.5.3 24 VDC Option

Table 3-10. 24 VDC Option

Parameter Specification

Connector Type 20A 3-way screw-type terminal block.
Input Power 40W maximum.
Input Voltage 23 to 25 VDC.
Fuse Protection
(Internal on power supply)

2A slo-blo.

3.1.6 Ground (GND)

A #10-32 stud is available on the rear for connecting a common chassis ground among all
of the equipment.

Note: The safety ground is provided through the AC power connector.

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