Comtech EF Data DT-4500 User Manual

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DT-4500 Series

Down Converters

Installation and Operation Manual

Part Number MN/DT4500.IOM

Revision 1

Comtech EF Data Documentation Update

Subject:

Date: Document:

Part Number: Collating Instructions:

Comments:

Add paragraph A.1.1 to read:

Change Specifics:

Added A.1.1 Configure Mute Mode

December 16, 2005 DT-4500 Series, Down Converters, Installation and Operation Manual, Revision 1, dated June 15, 2005 MN/DT4500.EA1 Attach this page to page A-1

Errata A

A.1.1 Configure Mute Mode

Turns the mute mode ON or OFF. When mute mode is OFF (default), the unit will mute upon changing RF frequency. When mute mode is ON, the unit will remain whatever its mute state upon changing RF frequency.

Command Details

Config. Mute Mode: <DEV/CMM_xxx'cr' xxx = ON or OFF

Confirmation: >DEV/CMM_xxx'cr''lf']

Mute Mode Status: <DEV/CMM_'cr'

Confirmation: >DEV/CMM_xxx'cr''lf']

Filename: T_ERRATA 1

Comtech EF Data Documentation Update

Subject:

Date: Document:

Part Number: Collating Instructions:

Comments:

Add paragraph A.1.1.1 to read:

Change Specifics:

Added A.1.1.1 Packed Configuration Status

December 16, 2005 DT-4500 Series, Down Converters, Installation and Operation Manual, Revision 1, dated June 15, 2005 MN/DT4500.EB1 Attach this page to page 41

Errata B

A.1.1.1 Packed Configuration Status

Configuration Status: <DEV/PACRCS_'cr' Confirmation: >DEV/PACRCS_aaaabbbcdeffgghijkl'cr''lf']

where: aaaa = # of 125kHz steps above base frequency bbb = # of 0.25 dB steps above 0.00 dB c = 1 if Transmitter ON, 0 if OFF, 2 if Cold d = 1 if unit ONLINE, 0 if OFFLINE e = 1 if Redundancy ON, else 0 ff = converter # (01-12,BU or 00 if e = 0) gg = 00 if 'ff' is 00 (redundancy OFF) gg = chain length (01-12) if 'ff' is BU gg = XX if 'ff' = 01 - 12 h = A if Auto Mode, M if Manual I = 1 if Cold Start Enabled, else 0 j = 1 if Auto recovery enabled, else 0 K = 1 if an Ext. Ref is present, else 0 l = 1 if Remote Mode, 0 if Local Mode

Notes: 1

If the converter is 1 kHz step size, this will be the number of 1 kHz steps above the base frequency. Also, this will be 5 bytes(aaaaa) long for model 4513X converters with 125 KHz frequency step size. This will be 7 bytes(aaaaaaa) long for all 1KHz step size converters.

If the converter is 0.1 -dB step size, this will be the number of 0.1 -dB steps above

the base frequency

If it is a backup Converter, it is always ‘A’.

If it is the primary converter, gg = P1 or P2 (single or dual polarity system.

Filename: T_ERRATA 1

DT-4500 Series

Down Converters

Installation and Operation Manual

Part Number MN/DT4500.IOM

Comtech EF Data is an ISO 9001 Registered Company

Comtech EF Data, 2114 West 7th Street, Tempe, Arizona 85281 USA, 480.333.2200, FAX: 480.333.2161.

Revision 1

June 15, 2005

DT4500 Series Down Converters MN/DT4500.IOM Preface Revision 1

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:

service@comtechefdata.com

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

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

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

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

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

For more information regarding the warranty policies, see Warranty Policy, p. xii.

Errata C

Comtech EF Data Documentation Update

Subject:

Date: Document:

Part Number: Collating Instructions:

Comments:

Add the attached procedure to System Operation

Change Specifics:

Added Dual IF Rack Mount Converters

August 28, 2006 DT-4500 Series, Down Converters, Installation and Operation Manual, Revision 1, dated June 15, 2005 MN/DT4500.EC1 Attach this page to page 25

Filename: T_ERRATA 1

Dual IF Rack Mount Converters

Comtech EF Data offers converters with the ability to switch the output IF frequency (Downconverters) and/or the input IF frequency (Upconverters) from 70 MHz to 140 MHz or vice versa. The actual IF bandwidth is maintained as the standard ± 18 MHz (± 20 MHz) of the 70 MHz configurations.

The software modification required for the implementation of the IF frequency switching are:

1. A front panel command to allow the output IF to switch from 70MHz to 140. a. The new selection is located in the “Configuration” menu tree. The “normal”

FREQ/ATT/MUT menu is split into two. First menu screen now has “RF FRE= XXXXX MHz on top line, with “IF FRE= XXX MHz” and “Rx= XXX” on second line. A second menu screen contains the attenuator setting.

b. Mute behavior after changing the IF frequency is the same as the normal mute behavior

after changing the RF frequency.

2. A new remote command is implemented to accomplish the identical operation as in (1). a. Command structure similar to the RF frequency selection.

The default is 70 MHz

Command Details

Set IF Frequency: <DEV/IFF_xxx'cr' (where xxx is either 140 or 70 without requiring

leading zero.

Confirmation: >DEV/IFF_ xxx'cr''lf'] (where xxx is either 140 or 70 without requiring

leading zero.

Retrieve Frequency: <DEV/IFF_'cr'

Confirmation: >DEV/IFF_ xxx'cr''lf'] (where xxx is either 140 or 70 without requiring

leading zero.

Mute behavior after changing the IF frequency would be the same as the mute behavior after changing the RF frequency.

Redundant operation

The customer can not “mix” dual IF converters with standard converters in a redundant system

Filename: T_ERRATA 2

Customer Support......................................................................................................................... ii

FIGURES ......................................................................................................................VII

TABLES.......................................................................................................................VIII

About this Manual ....................................................................................................................... ix

Conventions and References ....................................................................................................... ix

Metric Conversion ....................................................................................................................... ix

Trademarks .................................................................................................................................. ix

EMC Compliance......................................................................................................................... ix

Federal Communications Commission (FCC) ........................................................................... x

Safety Compliance ....................................................................................................................... xi

EN 60950 ....................................................................................................................................... xi

Warranty Policy.......................................................................................................................... xii

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

1.1 Overview .................................................................................................................................. 1

1.2 Functional Description ........................................................................................................... 2

1.3 Specifications........................................................................................................................... 4

1.4 Physical Configuration ......................................................................................................... 15

1.5 Front Panel Display .............................................................................................................. 16

1.6 Front Panel Test Point Samples........................................................................................... 16

1.7 Prime Power Switch.............................................................................................................. 16

iii

DT4500 Series Down Converters MN/DT4500.IOM Preface Revision 1

CHAPTER 2. INSTALLATION................................................................................... 19

2.1 Unpacking and Inspection....................................................................................................19

2.2 Rack Mount Installation....................................................................................................... 19

2.3 Prime Power Connection......................................................................................................19

2.4 Cable Connections ................................................................................................................ 20

2.4.1 Rear Panel Connections ................................................................................................... 20

2.4.2 RS-485/RS-232C Interface (COM 1), Connector J1 ....................................................... 21

2.4.3 High Speed Bus (HSB), Connector J3............................................................................. 22

2.4.4 Summary Fault Output (RELAY), Connector P1............................................................ 22

2.4.5 Cable Connections For Non-Redundant System Operation ............................................ 23

2.4.6 Cable Connections For Redundant System Operation..................................................... 23

CHAPTER 3. SYSTEM OPERATION ........................................................................ 25

3.1 Overview ................................................................................................................................ 25

3.2 Switching Power ON............................................................................................................. 27

3.3 Operation ............................................................................................................................... 27

3.3.1 Converter Commands ...................................................................................................... 35

3.3.2 Configuration Functions Menu........................................................................................ 36

3.3.3 Pre-select Function Menu ................................................................................................ 36

3.3.4 Monitor Status Function Menu ........................................................................................ 37

3.3.5 Current Faults Function Menu......................................................................................... 37

3.3.6 Stored Faults .................................................................................................................... 38

3.3.7 Utility Function Menu...................................................................................................... 39

APPENDIX A. REDUNDANT SYSTEM OPERATION ............................................... 41

A.1 Overview ............................................................................................................................... 41

A.2 Backup Converter................................................................................................................ 42

A.2.1 High Speed Bus (HSB) ................................................................................................... 42

A.2.2 Detachable Modules........................................................................................................ 42

A.3 Redundant Configurations.................................................................................................. 43

A.4 Redundant System Configuration ...................................................................................... 49

A.4.1 Initial Configuration........................................................................................................ 49

A.4.2 Automatic Configuration Verification ............................................................................ 50

A.4.3 Manual Configuration/Verification................................................................................. 52

A.4.4 Offset Adjustment........................................................................................................... 54

DT4500 Series Down Converters MN/DT4500.IOM Preface Revision 1

A.4.5 Redundancy Systems - Converter Removal.................................................................... 54

APPENDIX B. REMOTE CONTROL.......................................................................... 57

B.1 General .................................................................................................................................. 57

B.2 Protocol ................................................................................................................................. 58

B.2.1 Transmission Mode......................................................................................................... 58

B.2.2 Baud Rate ........................................................................................................................ 58

B.2.3 Format ............................................................................................................................. 58

B.2.4 Character Set ................................................................................................................... 58

B.2.5 Response Timeout........................................................................................................... 58

B.2.6 Bus Inactivity Requirement............................................................................................. 58

B.3 Access Methods..................................................................................................................... 59

B.3.1 Direct Access................................................................................................................... 59

B.3.2 Indirect Access ................................................................................................................ 59

B.4 Addresses............................................................................................................................... 60

B.4.1 Physical Address ............................................................................................................. 60

B.4.2 Virtual Address ............................................................................................................... 60

B.5 Message Structure................................................................................................................ 61

B.5.1 Start Character................................................................................................................. 61

B.5.2 Device Address ............................................................................................................... 61

B.5.3 Command ........................................................................................................................ 61

B.5.4 Confirmation Response................................................................................................... 61

B.5.5 Error Response ................................................................................................................ 62

B.5.6 End Of Message .............................................................................................................. 62

B.6 Command/Response Pairs................................................................................................... 63

B.6.1 Utility Commands ........................................................................................................... 63

B.6.2 Configuration Commands ............................................................................................... 66

B.6.3 Modes.............................................................................................................................. 69

B.6.4 Status Commands............................................................................................................ 71

B.6.5 Stored Alarm ................................................................................................................... 75

B.7 Error Processing................................................................................................................... 77

B.7.1 General Errors ................................................................................................................. 77

B.7.2 Configuration Errors ....................................................................................................... 77

B.7.3 Mode Errors..................................................................................................................... 77

B.7.4 Time-Outs........................................................................................................................ 77

B.8 Converter Remote Command Summary ........................................................................... 78

DT4500 Series Down Converters MN/DT4500.IOM Preface Revision 1

APPENDIX C. THEORY OF OPERATION................................................................. 81

C.1 Applications .......................................................................................................................... 81

C.2 RF Signal Conversion .......................................................................................................... 82

C.3 Monitor & Control............................................................................................................... 84

C.4 Installation, Operation and Maintenance.......................................................................... 84

APPENDIX D. MAINTENANCE AND TROUBLESHOOTING ................................... 85

D.1 Overview ............................................................................................................................... 85

D.2 Maintenance Testing............................................................................................................ 86

D.2.1 Test Point Samples.......................................................................................................... 86

D.2.2 Troubleshooting .............................................................................................................. 87

D.2.3 Converter Faults.............................................................................................................. 87

D.2.4 Converter I/O Modules ................................................................................................... 89

D.3 Spares .................................................................................................................................... 89

INDEX ...........................................................................................................................91

DT4500 Series Down Converters MN/DT4500.IOM Preface Revision 1

Figures

Figure 1. Front Panel (Model UT-4511 shown) ............................................................................ 2

Figure 2. Rear Panel (shown with RSM Module).......................................................................... 2

Figure 3. Typical Functional Block Diagram (Model DT-4512 shown)....................................... 3

Figure 4. UT-4511 Dimensional Envelope.................................................................................. 14

Figure 5. Physical Configuration - Down Converter................................................................... 15

Figure 6. Cable Interconnect Diagram......................................................................................... 23

Figure 7. Non-Redundant Converter Configuration .................................................................... 24

Figure 8. Non-Redundant Converter Configuration With Receive Switch Module ................... 24

Figure 9. Front Panel (Model DT-4511 shown) .......................................................................... 25

Figure 10. Rear Panel (with RSM Module)................................................................................. 25

Figure 11. Keypad........................................................................................................................ 27

Figure 12. Converter Operating Command Functions................................................................. 28

Figure 13. Configuration Menu Commands - Redundancy OFF. ............................................... 29

Figure 14. Configuration Menu Commands - Redundancy ON, Backup Unit Not Selected ...... 30

Figure 15. Configuration Menu Commands - Redundancy ON and Backup Unit Selected ...... 31

Figure 16. Pre-Select Menu Commands ...................................................................................... 32

Figure 17. Monitor Status Menu Commands............................................................................... 32

Figure 18. Current Faults Menu Commands................................................................................ 33

Figure 19. Stored Faults Menu Commands ................................................................................. 33

Figure 20. Utility Function Menu Commands............................................................................. 34

Figure 21. 1:1 Redundant Configuration .................................................................................... 44

Figure 22. 1:1 Redundant Configuration Diagram ..................................................................... 44

Figure 23. 1:1 Redundant Configuration Diagram ..................................................................... 45

Figure 24. 1:1 Redundant Configuration - Dual Source IF Input................................................ 46

Figure 25 1:1 Redundant Configuration Diagram .................................................................... 46

Figure 26. Dual Source1:N Redundant Configuration with PSM-XX and RSM-XX Installed .. 47

Figure 27. Dual Source 1:N Redundant ...................................................................................... 48

Figure 28. 1:3 Front Panel Displays ............................................................................................ 49

Figure 29. 1:3 System in AUTO Redundant Mode ..................................................................... 50

Figure 30. Converter #1 Being Backed Up.................................................................................. 51

Figure 31. Converter #1 in MANUAL, Others in AUTO............................................................ 52

Figure 32. Forced BU of Converter #1 ........................................................................................ 53

Figure 33. Typical Converter Functional Block Diagram (Model UT-4512 shown).................. 83

Figure 34. Converter Signal and Interconnecting Cable Diagra.................................................. 86

vii

DT4500 Series Down Converters MN/DT4500.IOM Preface Revision 1

Tables

Table 1. DT-4503 C-Band Down Converter Specifications.......................................................... 4

Table 2. DT-4503/E C-Band Down Converter Specifications ...................................................... 6

Table 3. DT-4503/X C-Band Down Converter Specifications...................................................... 8

Table 4. DT-451X Ku-Band Down Converter Specifications..................................................... 10

Table 5. DT-4513 and UT-4513/E Ku-Band Down Converter Specifications............................ 12

Table 6. Rear Panel Connectors................................................................................................... 20

Table 7. J1, 2 Wire RS-485 Interface Pin-Out............................................................................. 21

Table 8. J1, 4 Wire RS-485 Interface Pin-Out............................................................................. 21

Table 9. J1, RS-232C Interface Pin-Out ..................................................................................... 21

Table 10. J3, High Speed Bus Connector Pin-Out....................................................................... 22

Table 11. P1, Summary Fault Connector Pin-Out ....................................................................... 22

Table 12. Operating Functions – Front Panel .............................................................................. 26

Table 13. 4500 Series Down Converter Configurations.............................................................. 43

Table 14. Remote Command Summary....................................................................................... 78

viii

DT4500 Series Down Converters MN/DT4500.IOM Preface Revision 1

ABOUT THIS MANUAL

This manual provides installation and operation information for the Comtech EF Data DT4500 Series Down Converters. This is a technical document intended for earth station engineers, technicians, and operators responsible for the operation and maintenance of the DT4500 Series Down Converters.

CONVENTIONS AND REFERENCES

CAUTIONS AND WARNINGS

Indicates information critical for proper equipment function.

IMPORTANT

CAUTION

Indicates a hazardous situation that, if not avoided, may result in minor or moderate injury. CAUTION may also be used to indicate other unsafe practices or risks of property damage.

Indicates a potentially hazardous situation that, if not avoided, could result in

WARNING

death or serious injury.

METRIC CONVERSION

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

TRADEMARKS

All product names mentioned in this manual may be trademarks or registered trademarks of their respective companies and are hereby acknowledged.

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.

EMC COMPLIANCE

This is a Class A product. In a domestic environment, it may cause radio interference that requires the user to take adequate protection measures.

DT4500 Series Down Converters MN/DT4500.IOM Preface Revision 1

EN55022 COMPLIANCE

This equipment meets the radio disturbance characteristic specifications for information technology equipment as defined in EN55022.

EN50082-1 COMPLIANCE

This equipment meets the electromagnetic compatibility/generic immunity standard as defined in EN50082-1.

FEDERAL COMMUNICATIONS COMMISSION (FCC)

This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment.

This equipment generates, uses, and can radiate radio frequency energy. If not installed and used in accordance with the instruction manual, it may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference; in which case, users are required to correct the interference at their own expense.

Note: To ensure compliance, properly shielded cables for DATA I/O shall be used. More

specifically, these cables shall be shielded from end to end, ensuring a continuous shield.

DT4500 Series Down Converters MN/DT4500.IOM Preface Revision 1

SAFETY COMPLIANCE

EN 60950

Applicable testing is routinely performed as a condition of manufacturing on all units to ensure compliance with safety requirements of EN60950.

This equipment meets the Safety of Information Technology Equipment specification as defined in EN60950.

LOW VOLTAGE DIRECTIVE (LVD)

The following information is applicable for the European Low Voltage Directive (EN60950):

<HAR> Type of power cord required for use in the European Community.

CAUTION: Double-pole/Neutral Fusing.

ACHTUNG: Zweipolige bzw. Neutralleiter-Sicherung.

International Symbols:

Symbol Definition Symbol Definition

Alternating Current.

Fuse.

Protective Earth.

Chassis Ground.

Note: For additional symbols, refer to “Cautions” listed earlier in this preface.

DT4500 Series Down Converters MN/DT4500.IOM Preface Revision 1

WARRANTY POLICY

This Comtech EF Data product is warranted against defects in material and workmanship for a period of two years 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 to provide an easy-to-use 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 the equipment or the information in this manual, please contact the Comtech EF Data Customer Support Department.

xii

Chapter 1. Introduction

DT-4500

Series

Down

Converter

1.1 OVERVIEW

This manual provides instructions on the installation, operation and maintenance of the DT-4500 Series Down Converters manufactured by Comtech EF Data Corp.

Individual specifications for each model are included in this section.

DT-4503 DT-4503C DT-4503D DT-4503E

DT-4510 DT-4510D DT-4511 DT-4512 DT-4512E

DT-4513 DT-4513E

DT4500 Series Down Converters MN/DT4500.IOM Introduction Revision 1

1.2 FUNCTIONAL DESCRIPTION

The DT-4500 Series Down Converters are designed for use in communication systems, or in satellite downlink data systems, for the transmission of SCPC, DAMA and TDMA communication signals. The Down Converters can also be used in communications system applications with full transponder HDTV and analog TV.

The converter is designed to be hard mounted in a standard 19-inch (48.26 cm) rack or cabinet, or to be rack mounted using slide mechanisms provided with the converter to allow it to be serviced without its removal from the rack. An internally mounted exhaust fan for cooling is mounted on the rear of the chassis. An AC power connector, with an on/off switch, is also located on the rear on the chassis. A six-foot AC power cord is supplied with the converter.

All operator controls, indicators and displays for local and remote operation are located on the front panel of the converter. Connectors for the external interface connections are located on the rear of the converter chassis.

MADE IN USA

Figure 1. Front Panel (Model DT-4511 shown)

J4 J6 J8 J5

P1 RELAY

J1 COM 1

EXT REF

J2B OUT

J2A IN

Figure 2. Rear Panel (shown with RSM Module)

RFLP OUTLP INIFJ3 HSB

DT4500 Series Down Converters MN/DT4500.IOM Introduction Revision 1

MONITOR

CONTROL

RF INPUT

(12200-12750 MHz)

SYNTHESIZER

I/O MODULE

OSC.

OSC

IF OUTPUT

(70 or 140 MHz)

CONVERTER

SIGNAL PATH

MODULE

5/10 MHz

REF. OSC.

POWER SUPPLY

Figure 3. Typical Functional Block Diagram (Model DT-4512 shown)

DT4500 Series Down Converters MN/DT4500.IOM Introduction Revision 1

1.3 SPECIFICATIONS

Note: Contact CEFD with specific requirements.

Table 1. DT-4503 C-Band Down Converter Specifications

Characteristic Specification Frequency Range

DT-4503/C Conversion Step Size Preset Channels Stability Over Time Stability Over Temp

RF Input

Noise Figure Level Impedance Return Loss

IF Output

Range

Output Level

Intermodulation

Non–carrier Spurious

Carrier Spurious

Return Loss Impedance

Transfer

Gain

Attenuation Adjust

Gain Stability

Ripple: 70MHz IFCF

140 MHz IFCF

Slope Image Rejection AM to PM IF Bandwidth

External Ref.

3400 to 4200 MHz Dual, No Inversion 125 kHz standard, 1kHz optional 32 Frequencies ± 1 x 10 ± 1 x 10

-9

/Day

-8

0 to 50°C (32 to 122°F)

11 dB Maximum at 0 dB Attenuation

-45 dBm Typical 50 Ω 20 dB Min. with RF/IF connector module

+20 dBm at 1 dB Compression 52 to 88 or 104 to 176 MHz), optional 50 to 80

MHz or 100 to 180 MHz, (see Note)

-60 dBc @ 0 dBm Output SCL

-80 dBm

-65 dBc @ 0 dBm Output 23 dB Minimum 50 or 75 Ω

45 dB ± 2 dB 0 to 20 in 0.25 dB Steps

0.1 dB Steps Optional ± 0.25 dB/Day ± 0.25 dB (± 18 MHz), optional ± 20 MHz,

(see Note)

0.75 dB (± 36 MHz), optional ± 40 MHz, (see Note)

0.05 dB/MHz

-80 dB Inband

0.1

. / dB for Output up to –5 dBm

36 or 72 MHz), optional 40 or 80 MHz,

(see Note)

Input 5 or 10 MHz @ +3 dBm Optional 10 MHz Rear Panel Reference Output

DT4500 Series Down Converters MN/DT4500.IOM Introduction Revision 1

Characteristic Specification Group Delay

Phase Noise

Linear Group Delay Parabolic Delay Group Delay Ripple

100 Hz 1 kHz 10 kHz 100 kHz 1 MHz

Remote Control (Rear Panel) Indicators (Front Panel)

Power On Receive Remote On Line Stored Fault Fault

Test Points (Front Panel)

RF Sample IF Sample Optional L.O. Sample

Power

Voltage Frequency Dissipation Power Option

Environmental

Temperature Altitude Humidity

Physical

Width Height Depth Weight

MTBF

Summary Alarm Relay Closure

0.03 ns/MHz

0.01 ns/MHz

1.0 ns Peak-to-Peak

Limit (dBc/Hz)

-80

-89

-95

-105

-120

Typical (dBc/Hz)

-83

-92

-97

-109

-124

Comm Port RS-485 or RS-232

Green LED Yellow LED Yellow LED Yellow LED Red LED Red LED

SMA, -20 dBc Nominal BNC, -20 dBc Nominal

90 to 250 Vac 47 to 63 Hz 60 Watts

-48 Vdc

0 to 50° C (32 to 122° F) 10,000 Feet MSL 0 to 95 % Relative

19 Inches (48.26 cm)

1.75 Inches (4.44 cm)

22 Inches (55.88 cm) 25 Pounds (11.40 kg)

49,740 hrs. (calculated) >100,000 hrs. (field experience)

Form C

DT4500 Series Down Converters MN/DT4500.IOM Introduction Revision 1

Table 2. DT-4503/E C-Band Down Converter Specifications

Characteristic Specification Frequency Range

DT-4503/E Conversion Step Size Preset Channels Stability Over Time Stability Over Temp

RF Input

Noise Figure Level Impedance Return Loss

IF Output

Range

Output Level

Intermodulation

Non–carrier Spurious

Carrier Spurious

Return Loss Impedance

Transfer

Gain

Attenuation Adjust

Gain Stability

Ripple: 70 MHz IFCF

140 MHz IFCF

Slope Image Rejection AM to PM IF Bandwidth

4500 to 4800 MHz Dual, No Inversion 125 kHz standard, 1kHz optional 32 Frequencies ± 1 x 10 ± 1 x 10

-9

/Day

-8

/Day 0 to 50 °C ( 32 to 122 °F)

11 dB Maximum at 0 dB Attenuation

-45 dBm Typical 50 Ω 20 dB Min. with RF/IF Connector Module

+20 dBm at 1 dB Compression 52 to 88 or 104 to 176 MHz), optional 50 to 80

MHz or 100 to 180 MHz (see Note)

-60 dBc @ 0 dBm Output SCL

-80 dBm

-65 dBc @ +3 dBm Output 23 dB Minimum with RF/IF connector module 50 or 75 Ω

45 dB ± 2 dB 0 to 20 in 0.25 dB Steps

0.1 dB Steps Optional ± 0.25 dB/Day ± 0.25 dB (± 18 MHz), optional ± 20 MHz,

(see Note)

0.75 dB (± 36 MHz), optional ± 40 MHz, (see Note)

0.05 dB/MHz

-80 dB Inband

0.1

./ dB for Output up to –5 dBm

36 or 72 MHz), optional 40 or 80 MHz,

(see Note)

External Ref.

Group Delay

Linear Group Delay Parabolic Delay Group Delay Ripple

Input 5 or 10 MHz @ +3dBm Optional 10 MHz Rear Panel Reference Output

0.03 ns/MHz

0.01 ns/MHz

1.0 ns Peak-to-Peak

DT4500 Series Down Converters MN/DT4500.IOM Introduction Revision 1

Characteristic Specification Phase Noise

100 Hz 1 kHz 10 kHz 100 kHz 1 MHz

Remote Control (Rear Panel) Indicators (Front Panel)

Power On Receive Remote On Line Stored Fault Fault

Test Points (Front Panel)

RF Sample IF Sample Optional L.O. Sample

Power

Voltage Frequency Dissipation Power Option

Environmental

Temperature Altitude Humidity

Physical

Width Height Depth Weight

MTBF

Summary Alarm Relay Closure

Limit (dBc/Hz)

-80

-89

-95

-105

-120

Typical (dBc/Hz)

-83

-92

-97

-109

-124

Comm Port RS-485 or RS-232

Green LED Yellow LED Yellow LED Yellow LED Red LED Red LED

SMA, -20 dBc Nominal BNC, -20 dBc Nominal

90 to 250 Vac, Autoranging, optional –48 VDC 47 to 63 Hz 60 Watts

-48 Vdc

0 to 50°C (32 to 122° F) 10,000 Feet MSL 0 to 95 % Relative

19 Inches (48.26 cm)

1.75 Inches (4.44 cm)

22 Inches (55.88 cm) 15 Pounds (7.00 kg)

49,740 hrs. (calculated) >100,000 hrs. (field experience)

Form C

DT4500 Series Down Converters MN/DT4500.IOM Introduction Revision 1

Table 3. DT-4503/X C-Band Down Converter Specifications

Characteristic Specification Frequency Range

DT-4503 DT-4503/D DT-4503/E Conversion Step Size Preset Channels Stability Over Time Stability Over Temp

RF Input

Noise Figure Level Impedance Return Loss

IF Output

Range

Output Level

Intermodulation

Non–carrier Spurious

Carrier Spurious

Impedance Return Loss

Transfer

Gain

Attenuation Adjust

Gain Stability

Ripple: 70 MHz IFCF

140 MHz IFCF Slope Image Rejection AM to PM IF Bandwidth

3625 to 4200 MHz 3400 to 3700 MHz Refer to Table 2. Dual, No Inversion 125 kHz standard, 1kHz optional 32 Frequencies and Gains ± 1 x 10 ± 1 x 10

-9

/Day

-8

0 to 50°C (32 to 122oF)

11 dB Maximum at 0 dB Attenuation

-45 dBm Typical 50 Ω 20 dB Min. with RF/IF Connector Module

+20 dBm at 1 dB Compression 52 to 88 or 104 to 176 MHz), optional 50 to 80

MHz or 100 to 180 MHz, (see Note)

-60 dBc @ 0 dBm Output SCL

-80 dBm

-65 dBc @ +3 dBm Output 50 or 75 Ω 23 dB Min. with RF/IF connector module

or SW Module

45 dB ± 2 dB 0 to 20 in 0.25 dB Steps

0.1 dB Steps Optional ± 0.25 dB/Day ± 0.25 dB (± 18 MHz), optional ± 20 MHz, (see Note)

0.75 dB (± 36 MHz), optional ± 40 MHz, (see Note) 10.05 dB/MHz

0.05 dB/MHz

-80 dB Inband

0.1

./ dB for Output up to –5 dBm 36 or 72 MHz), optional 40 or 80 MHz, (see Note)

External Ref.

Input 5 or 10 MHz @ +3dBm Optional 10 MHz Rear Panel Reference Output

DT4500 Series Down Converters MN/DT4500.IOM Introduction Revision 1

Characteristic Specification Group Delay

Phase Noise

Linear Group Delay Parabolic Delay Group Delay Ripple

100 Hz 1 KHz 10 KHz 100 KHz 1 MHz

Remote Control (Rear Panel) Indicators (Front Panel)

Power On Mute Remote On Line Stored Fault Fault

Test Points (Front Panel)

RF Sample IF Sample Optional L.O. Sample

Power

Voltage Frequency Dissipation Power Option

Environmental

Temperature Altitude Humidity

Physical

Width Height Depth Weight

MTBF

Summary Alarm Relay Closure

0.03 ns/MHz

0.01 ns/MHz

1.0 ns Peak-to-Peak

Limit (dBc/Hz)

-80

-89

-95

-105

-120

Typical (dBc/Hz)

-83

-92

-97

-109

-124

Comm Port RS-485 or RS-232

Green LED Yellow LED Yellow LED Yellow LED Red LED Red LED

SMA, -20 dBc Nominal BNC, -20 dBc Nominal

90 to 250 Vac Autoranging 47 to 63 Hz 60 Watts

-48 Vdc

0 to 50° C (32 to 122° F) 10,000 Feet MSL 0 to 95 % Relative

19 Inches (48.26 cm)

1.75 Inches (4.44 cm) 22 Inches (55.88 cm) 15 Pounds (7.00 kg)

49,740 hrs. (calculated) >100,000 hrs. (field experience)

Form C

DT4500 Series Down Converters MN/DT4500.IOM Introduction Revision 1

Table 4. DT-451X Ku-Band Down Converter Specifications

Characteristic Specification

Frequency Range

DT-4510 DT-4510/D DT-4511 DT-4512 DT-4512/E Conversion Step Size Preset Channels Stability Over Time Stability Over Temp

RF Input

Level Return Loss Impedance Noise Figure

IF Output

Level Range

Intermodulation

Non–carrier Spurious

Carrier Spurious

Impedance Return Loss

Transfer

Gain

Attenuation Adjust

Gain Stability

Ripple: 70 MHz IFCF 140 MHz IFCF Slope Image Rejection AM to PM

External Ref.

10.95 to 11.70 GHz

10.70 to 11.70 GHz

11.70 to 12.20 GHz

12.20 to 12.75 GHz

12.50 to 12.80 GHz Dual, No Inversion 125 kHz standard, 1kHz optional 32 Frequencies and Gains ± 1 x 10 ± 1 x 10

-9

/Day

-8

0 to 50°C (32 to 122oF)

-45 dBm Typical 20 dB Min. with IO Module 50 Ω 11 dB Maximum at 0 dB Attenuation

+20 dBm at 1 dB Compression 52 to 88 or 104 to 176 MHz

-60 dBc @ 0 dBm Output SCL

-80 dBm

-65 dBc @ 0 dBm Output 50 or 75 Ω 23 dB Min. with IO Module

45 dB ± 2 dB 0 to 20 in 0.25 dB Steps

0.1 dB Steps Optional ± 0.25 dB/Day ± 0.25 dB (± 18 MHz)

0.75 dB (± 36 MHz)

0.05 dB/MHz

-80 dB Inband

0.1

./ dB for Output up to –5 dBm

Input 5 or 10 MHz @ +3dBm Optional 10 MHz Rear Panel Reference Output

DT4500 Series Down Converters MN/DT4500.IOM Introduction Revision 1

Characteristic Specification

Group Delay

Phase Noise

Linear Group Delay

Parabolic Delay

Group Delay Ripple

100 Hz

1 KHz

10 KHz

100 KHz

1 MHz

0.03 ns/MHz

0.01 ns/MHz

1.0 ns Peak-to-Peak

Limit (dBc/Hz)

-72

-79

-89

-98

-110

Typical (dBc/Hz)

-79

-82

-92

-101

-114

Remote Control (Rear Panel)

Indicators (Front Panel)

Power On Mute Remote On Line Stored Fault Fault

Test Points (Front Panel)

RF Sample IF Sample Optional L.O. Sample

Power

Voltage Frequency Dissipation Power Option

Environmental

Temperature Altitude Humidity

Comm Port RS-485 or RS-232

Green LED Yellow LED Yellow LED Yellow LED Red LED Red LED

SMA, -20 dBc Nominal BNC, -20 dBc Nominal

90 to 250 Vac Autoranging 47 to 63 Hz 60 Watts

-48 Vdc

0 to 50° C (32 to 122° F) 10,000 Feet MSL 0 to 95 % Relative

Physical

Width Height Depth Weight

MTBF

Summary Alarm Relay Closure

19 Inches (48.26 cm)

1.75 Inches (4.44 cm) 22 Inches (55.88 cm) 15 Pounds (7.00 kg)

49,740 hrs. (calculated) >100,000 hrs. (field experience)

Form C

DT4500 Series Down Converters MN/DT4500.IOM Introduction Revision 1

Table 5. DT-4513/E Ku-Band Down Converter Specifications

Characteristic Specification

Frequency Range

DT-4513 DT-4513/E Conversion Step Size Preset Channels Stability Over Time Stability Over Temp

RF Input

Level Return Loss Impedance Noise Figure

IF Output

Level Range

Intermodulation

Non–carrier Spurious

Carrier Spurious

Impedance Return Loss

Transfer

Gain

Attenuation Adjust

Gain Stability

Ripple: 70 MHz IFCF 140 MHz IFCF Slope Image Rejection AM to PM

External Ref.

Group Delay

Linear Group Delay

Parabolic Delay

Group Delay Ripple

10.95 to 12.75 GHz

10.70 to 12.75 GHz Dual, No Inversion 125 kHz standard, 1kHz optional 32 Frequencies ± 1 x 10 ± 1 x 10

-9

/Day

-8

0 to 50°C (32 to 122oF)

-45 dBm Typical 20 dB Min. with RF/IF Connector Module 50 Ω 11 dB Maximum at 0 dB Attenuation

+20 dBm at 1 dB Compression 52 to 88 or 104 to 176 MHz

-60 dBc @ 0 dBm Output SCL

-80 dBm

-65 dBc @ 0 dBm Output 50 or 75 Ω 23 dB Min. with IO Module

45 dB ± 2 dB 0 to 20 in 0.25 dB Steps

0.1 dB Steps Optional ± 0.25 dB/Day ± 0.25 dB (± 18 MHz)

0.75 dB (± 36 MHz)

0.05 dB/MHz

-80 dB Inband

0.1

./ dB for Output up to –5 dBm

Input 5 or 10 MHz @ +3dBm Optional 10 MHz Rear Panel Reference Output

0.03 ns/MHz

0.01 ns/MHz

1.0 ns Peak-to-Peak

DT4500 Series Down Converters MN/DT4500.IOM Introduction Revision 1

Characteristic Specification

Phase Noise

100 Hz

1 KHz

10 KHz

100 KHz

1 MHz

Limit (dBc/Hz)

-66

-76

-86

-96

-106

Typical (dBc/Hz)

-69

-79

-89

-99

-109

Remote Control (Rear Panel)

Indicators (Front Panel)

Power On Receive Remote On Line Stored Fault Fault

Test Points (Front Panel)

RF Sample IF Sample Optional L.O. Sample

Power

Voltage Frequency Dissipation Power Option

Environmental

Temperature Altitude Humidity

Comm Port RS-485 or RS-232

Green LED Yellow LED Yellow LED Yellow LED Red LED Red LED

SMA, -20 dBc Nominal BNC, -20 dBc Nominal

90 to 250 Vac Autoranging 47 to 63 Hz 60 Watts

-48 Vdc

0 to 50° C (32 to 122° F) 10,000 Feet MSL 0 to 95 % Relative

Physical

Width Height Depth Weight

MTBF

Summary Alarm Relay Closure

19 Inches (48.26 cm)

1.75 Inches (4.44 cm) 22 Inches (55.88 cm) 15 Pounds (7.00 kg)

49,740 hrs. (calculated) >100,000 hrs. (field experience)

Form C

DT4500 Series Down Converters MN/DT4500.IOM Introduction Revision 1

1.3.1 DIMENSIONAL ENVELOPE (DT-4500)

Dimensions are shown in both inches and centimeters.

17.00 (432)

1.75” (4.45)

SAMPLE STATUS

RF IF

POWER ON

TRANSMIT

REMOTE

ON LINE

FAULT

STORED FAULT

18.25

(46.35)

19.0

(48.3)

22.00 (55.9)

ENT

CLR

Figure 4. Dimensional Envelope

DT4500 Series Down Converters MN/DT4500.IOM Introduction Revision 1

1.4 PHYSICAL CONFIGURATION

Figure 5 is a top view layout of a DT-4500 Series Down Converter chassis with the cover removed. Major chassis components are shown in Figure 5. The major module assemblies shown in the layout are:

 Signal Path Module

 Step Loop Module

 Monitor & Control Assembly

 Transmit I/O Switch Module

 Reference Oscillator Assembly

 Sum Loop Module

 Power Supply Assembly

Sum Module

Signal

Path

Mo ni t o r

& Cont rol

Board

Switch Module

Power Supply

Fil ter

Module

Ref erence Oscillator

Step

Module

Figure 5. Physical Configuration - Down Converter

DT4500 Series Down Converters MN/DT4500.IOM Introduction Revision 1

1.5 FRONT PANEL DISPLAY

The front panel display is a two line, 24-character, LCD display. Each configuration function, or operating mode, is shown on the display when the operator enters a command into the keypad on the front panel.

1.6 FRONT PANEL TEST POINT SAMPLES

Two test point connections are located on the front panel for monitoring the RF input and the IF output. An SMA connector is provided for the RF input, and a BNC connector is provided for the IF output. There is also an optional RF LO monitor available that replaces the RF monitor.

1.7 PRIME POWER SWITCH

The on/off prime power switch is located on the rear of the chassis adjacent to the prime power input connector. The power switch contains a filter and dual fuse. The dual fuse is rated for 2 Amps.

1.8 NEW IN THIS MANUAL

Incorporated Errata’s A though E

Incorporated new figure for TSEQM Connector Locations.

DT4500 Series Down Converters MN/DT4500.IOM Introduction Revision 1

NOTES:

2.1 UNPACKING AND INSPECTION

Inspect the shipping container for damage. If the shipping containers are damaged, keep them until the contents of the shipment have been carefully inspected and checked for normal operation.

Remove the packing list from the outside of the shipping carton. Open the carton and remove the contents, checking the contents against the packing list. Verify completeness of the shipment and that the unit functions correctly. If damage is evident, contact the carrier and Comtech EF Data immediately and submit a damage report.

If the unit needs to be returned to Comtech EF Data, please use the original shipping container.

2.2 RACK MOUNT INSTALLATION

Chapter 2. Installation

The DT-4500 Series Down Converters are designed for installation in a standard 19 inch rack cabinet or enclosure. The converter chassis requires 1-3/4 inches of panel height space. Adequate air ventilation should be provided on both sides of the rack-mounted equipment.

If the converter is to be mounted on slides, the slides must be the Comtech EF Data rack slides provided with the converter. Mount the slides on the sides of the converter chassis with the mounting hardware provided. Then, install the slide rails in the rack cabinet enclosure.

Slide the converter into the front of the rack cabinet until the rear of the front panel contacts the mounting surface of the cabinet. Secure the converter to the rack cabinet with four screws inserted through the converter’s front panel slotted holes.

2.3 PRIME POWER CONNECTION

The detachable power cord mates with the AC Prime power receptacle on the rear of the converter chassis. A power cord for connection to 90 to 125 Vac, or 205 to 240 Vac, power sources is provided with the converter.

DT4500 Series Down Converters MN/DT4500.IOM Installation Revision 1

2.4 CABLE CONNECTIONS

Connect the signal cables to the connectors on the rear panel as shown in Figure 6. The cable signal functions are listed in Table 6.

2.4.1 REAR PANEL CONNECTIONS

Table 6. Rear Panel Connectors

Connector Description

Prime Power AC Prime Power Input (AC POWER), Optional –48 Vdc

J1: Serial Communications Interface for RS-485 or RS-232 COMM links (COM 1).

J2: External Reference Oscillator Input

J3: High Speed Bus (HSB)

J4: Converter IF Input (IF).

J5: Converter RF Output (RF).

J6: IF TSM Switching Loop Input (LP IN).

J7: RF TSM Switching Loop Input (LP IN).

J8: IF TSM Switching Loop Output (LP OUT).

J9: RF TSM Switching Loop Output (LP OUT).

P1: Summary Fault Output (RELAY).

DT4500 Series Down Converters MN/DT4500.IOM Installation Revision 1

2.4.2 RS-485/RS-232C INTERFACE (COM 1), CONNECTOR J1

The RS-485/RS-232C Interface connector, J1, is 9 pin "D" type DB9F connector socket. The pin-out specifications for RS-485 are contained in Table 7 and Table 8. The specification for RS-232 is contained in Table 9. The mating connector is a DB9M.

Table 7. J1, 2 Wire RS-485 Interface Pin-Out Table 8. J1, 4 Wire RS-485 Interface Pin-Out

Pin # Description

1 GND; Ground

4 +RX/TX; Signal

5 -RX/TX; Signal Complement

8 +RX/TX; Signal

9 -RX/TX; Signal Complement

Note: Pins 8 & 9 are the loop to the next

converter.

Pin # Description

1 GND; Ground

4 +TX; Signal

5 -TX; Signal Complement

8 +RX; Signal

9 -RX; Signal Complement

Table 9. J1, RS-232C Interface Pin-Out

Pin # Description

2 TD; Transmit Data

3 RD; Receive Data

5 GND; Ground

6 DSR; Unit Ready - always high.

7 RTS; Request to Send. Looped to CTS.

8 CTS; Clear to Send

DT4500 Series Down Converters MN/DT4500.IOM Installation Revision 1

2.4.3 HIGH SPEED BUS (HSB), CONNECTOR J3

The High Speed Bus connector, J3, is 25-pin "D" type DB25F connector socket. The pin-out specifications are contained in Table 10. The mating connector is a DB25M.

Note: This is not a “straight through” cable assembly. Contact Comtech EF Data for detailed

wire drawings when cabling between converters.

Table 10. J3, High Speed Bus Connector Pin-Out

Pin # Description Pin # Description Pin # Description

1 Cntl_12 10 Aux_3 18 Cntl_3

2 Cntl_10 11 Aux_1 19 Cntl_1

3 Cntl_8 12 -Rx/Tx 20 +14V Out

4 Cntl_6 13 GND 21 +14V In

5 Cntl_4 14 Cntl_11 22 GND

6 Cntl_2 15 Cntl_9 23 Aux_2

7 Cntl_In 16 Cntl_7 24 GND

8 +14V Out 17 Cntl_5 25 +Rx/Tx

9 +14V In

2.4.4 SUMMARY FAULT OUTPUT (RELAY), CONNECTOR P1

The summary fault output connector, P1, is 9-pin "D" type DB9F connector. The pin-out specifications are contained in Table 11. The mating connector is a DB9M.

Table 11. P1, Summary Fault Connector Pin-Out

Pin # Description

1 Summary Fault NC

2 Summary Fault NO

5 Ground

6 Summary Fault Com

7 External Fault Input

Notes: 1

Pin 1 to Pin 6: Fault.

Pin 2 to Pin 6: No Fault.

Pin 7 to Pin 5: Forced Fault. Typically used with external group delay equalizers

DT4500 Series Down Converters MN/DT4500.IOM Installation Revision 1

Prime Power Cord Input

5/10 MHz Ref. Osc. Input J2

Summary Fault Relay Output

Serial Comm. Interface

(EIA-485 / EIA-232C)- COM 1

High Speed Bus (HSB)

Power

Supply

Monitor & Control Assembly

Reference

Oscillator

Fine Step

Module

IF Output (IF)

IF Loop Input (LP IN)

IF Loop Output (LP OUT)

RF Input (RF)

(Not Used)

Receive

I/O Switch

Module

RF Converter

Loop

Module

Figure 6. Cable Interconnect Diagram

2.4.5 CABLE CONNECTIONS FOR NON-REDUNDANT SYSTEM OPERATION

In non-redundant converter configuration the converter has an Input/Output Module (IOM-XX) for the RF input and the IF Output. A converter with a Transmit or Receive Switch Module may be operated in a non-redundant configuration if an IOM is unavailable. Figure 7 is an illustration of the converter cable connections with an IOM installed. Figure 8 is an illustration of the converter cable connections with a TSM installed.

2.4.6 CABLE CONNECTIONS FOR REDUNDANT SYSTEM OPERATION

Sum

In subsystems where a redundant converter configuration is used, the backup Converter has an Input/Output Module (IOM-XX) and the online converters have Receive Switch Modules (TSM-XX), which switch to the backup Converter when a fault is detected. Redundant system operation is discussed in Appendix A, Redundant System Operation.

DT4500 Series Down Converters MN/DT4500.IOM Installation Revision 1

CONNECTION

RSM-XX

IOM-XX

OUTPUT

RFIFJ3 HSB

INPUT

Figure 7. Non-Redundant Converter Configuration

J4 J6 J8

J3 HSB IF

LP OUTLP IN RF

IF OUTPUT RF INPUT

CONNECTION

DOWN CONVERTER - RSM

IF OUTPUT

Figure 8. Non-Redundant Converter Configuration With Receive Switch Module (RSM-XX) Installed

RF INPUT

3.1 OVERVIEW

This chapter contains instructions for operating the converter. Illustrations of the front and rear panels are provided showing the keypad for operator input commands, LCD Display, LED status indicators, and the connectors. Tables are provided to show the control and operating functions of the converter.

The front and rear panels are shown below. Table 12 lists of the operating functions for the keypad, LCD display, LED indicators and test sample connections on the front panel.

Chapter 3. System Operation

Figure 9. Front Panel (Model DT-4511 shown)

J4 J6 J8 J5

P1 RELAY

J1 COM 1

EXT REF

MADE IN USA

EXT REF

J2B OUT

J2A IN

Figure 10. Rear Panel (with RSM Module)

RFLP OUTLP INIFJ3 HSB

DT4500 Series Down Converters MN/DT4500.IOM System Operation Revision 1

Table 12. Operating Functions – Front Panel

Item Reference Designation Functional Description

Enter key Enters commands into the converter.

ENT

Clear key Clears commands and data selected and not

CLR

Right Arrow key Selects functions and the menu operating data.

Left Arrow key Selects functions and the menu operating data.

Up Arrow key Selects the operating menu and data values.

Down Arrow key Selects the operating menu and data values.

entered.

LCD Display Displays commands and data

DT_4511-1

entered into the keypad.

SW VER 4.06 SN45113513

Indicator Color Function

POWER ON

TRANSMIT

REMOTE

ON LINE

FAULT

STORED FAULT

Item Reference

Designation

RF SAMPLE RF An SMA connector test point to sample RF.

IF SAMPLE IF A BNC connector test point to sample IF.

Green

Yellow

Red

Prime power is applied when the light is on.

Transmit function operating when the light is on.

In Remote Control Mode when the light is on.

Operating on-line to transmit data when the light is on.

Fault condition exists when the light is on.

Faults stored and logged when the light is on.

Function

DT4500 Series Down Converters MN/DT4500.IOM System Operation Revision 1

3.2 SWITCHING POWER ON

Before turning the Prime Power Switch to the ON position, check to ensure that the installation is complete, and verify that the converter is connected to the proper prime power source, RF Input and IF Output.

Switch the ON/OFF Prime Power Switch on the rear panel to ON. Verify that the cooling fan is operating, and that the POWER ON LED STATUS indicator light is on.

After the AC power is switched on and before pressing the buttons on the keypad, the LCD display message should be similar to:

DT-4512-X

SW VER 2.08 SN4513XXXX

3.3 OPERATION

Local operation of the RF Down Converter is controlled by operator input commands initiated through the six-button keypad on the front panel shown in Figure 11. The keypad is the local operator's interface to control, configure and monitor the status of the converter. Operator inputs and commands entered into the keypad are displayed by the front panel 24-character, two line, LCD display. See Appendix B for Remote Control.

There are six operating command functions: Configuration, Pre-Select, Monitor Status, Currents Faults, Stored Faults and Utility Functions. A flow-chart for selecting the commands, operating menus, and data inputs is shown in Figure 12 through Figure 20.

ENT

CLR

Figure 11. Keypad

DT4500 Series Down Converters MN/DT4500.IOM System Operation Revision 1

--------DT-4513--------

-SOFTWARE VERSION-1.00-

---------SELECT---------

----CONFIGURATION-MENU--

---------SELECT---------

----PRE-SELECT MENU-----

---------SELECT---------

--MONITOR-STATUS-MENU---

---------SELECT---------

--CURRENT-FAULTS-MENU---

---------SELECT---------

---STORED-FAULTS-MENU---

LEGEND

---------SELECT---------

-UTILITY-FUNCTIONS-MENU-

DISPLAY

---------SELECT---------

--MONITOR-STATUS-MENU---

Figure 12. Converter Operating Command Functions

KEY-PAD

ENT

CLR

DT4500 Series Down Converters MN/DT4500.IOM System Operation Revision 1

---------SELECT---------

----CONFIGURATION-MENU--

ENTER

FREQ= 12XXX.XXX-MHz-----

ATTN=-10.00-DB---Rx=OFF-

----EXTERNAL-5-MHz------

--REFERENCE-PRESENT-----

--ENTRY-MODE-=-REMOTE---

-COLD-START-=-DISABLED--

FAULT RECOVERY:-MANUAL--

------------------------

REDUNDANCY-CONFIG?-OFF--

------------------------

* Displayed only when there is

a 5/10 MHz reference input.

LEGEND

DISPLAY

---------SELECT---------

--MONITOR-STATUS-MENU---

KEY-PAD

ENT

CLR

Figure 13. Configuration Menu Commands - Redundancy OFF.

DT4500 Series Down Converters MN/DT4500.IOM System Operation Revision 1

---------SELECT---------

----CONFIGURATION-MENU--

ENTER

FREQ= 12XXX.XXX-MHz-----

ATTN=-10.00-DB---Rx=OFF-

** Manual when “Redundancy Config ON” and not in “BU”

----EXTERNAL-5-MHz------

--REFERENCE-PRESENT-----

--ENTRY-MODE-=-REMOTE---

-COLD-START-=-DISABLED--

FAULT RECOVERY:-MANUAL--

------------------------

REDUNDANCY-CONFIG?-OFF--

------------------------

LEGEND

* Displayed only when there is a 5/10 MHz reference input.

ENT + DOWN + ENT

CLR

KEY-PAD

DISPLAY

---------SELECT---------

--MONITOR-STATUS-MENU---

REDUNDANCY-CONFIG?-ON---

-CONVERTER-#-XX---------

ENT

CLR

Figure 14. Configuration Menu Commands - Redundancy ON, Backup Unit Not Selected

DT4500 Series Down Converters MN/DT4500.IOM System Operation Revision 1

---------SELECT---------

----CONFIGURATION-MENU--

ENTER

FREQ= 12XXX.XXX-MHz-----

ATTN=-10.00-DB---Rx=OFF-

REDUNDANCY-CONFIG?-ON---

-CONVERTER-#-01---------

----EXTERNAL-5-MHz------

--REFERENCE-PRESENT-----

--ENTRY-MODE-=-REMOTE---

-COLD-START-=-DISABLED--

FAULT RECOVERY:-MANUAL--

------------------------

REDUNDANCY-CONFIG?-OFF--

------------------------

ENT + DOWN + ENT

ENT + UP + ENT

REDUNDANCY-CONFIG?-ON---

-CONVERTER-#-XX---------

* Displayed only when there is a 5/10 MHz reference input.

ENT + RIGHT+UP + ENT

LEGEND

ENT + RIGHT+UP . . . +UP + ENT

REDUNDANCY-CONFIG?-ON---

-CONVERTER-#-BU---1:03--

-CONVERTER-123456789ABC-

-AUTO/MAN--AAM----------

CONV-01-OFFSET=+00.00-DB

--ACTIVATE-BACKUP:-NO---

-CONV-#03-FRQ=XXXXX.XXX-

-ATEN=10.00---MANUAL-OK-

KEY-PAD

ENT

DISPLAY

---------SELECT---------

--MONITOR-STATUS-MENU---

CLR

Figure 15. Configuration Menu Commands -

Redundancy ON and Backup Unit Selected

DT4500 Series Down Converters MN/DT4500.IOM System Operation Revision 1

---------SELECT---------

-----PRE-SELECT-MENU----

ENTER

-DISPLAY-PRE-SELECT-XX--

XXXXX.XXX-MHz--XX.XX--DB

-CONFIGURE-CONVERTER-TO-

-----PRE-SELECT?-XX-----

-PROGRAM-PRE-SELECT-XX-XXXX.XXX-MHZ---XX.XX-DB-

----CLEAR-DATA-FROM-----

-----PRE-SELECT?-XX-----

LEGEND

DISPLAY

---------SELECT---------

--MONITOR-STATUS-MENU---

KEY-PAD

ENT

CLR

Figure 16. Pre-Select Menu Commands

---------SELECT---------

---MONITOR-STATUS-MENU--

ENTER

15VDC=-15.6--14VDC=-14.0

-VCC-=5.0---5VDis-=-4.0-

--CONVERTER-TEMP-=-+50C-

--IFLO-TUNING-=-X.X-V---

SYNTH.-TUNING-=-X.X-V---

--COARSE=X.XX-FINE=X.XX-

LEGEND

DISPLAY

---------SELECT---------

--MONITOR-STATUS-MENU---

KEY-PAD

ENT

CLR

Figure 17. Monitor Status Menu Commands

DT4500 Series Down Converters MN/DT4500.IOM System Operation Revision 1

---------SELECT---------

---CURRENT-FAULTS-MENU--

ENTER

------POWER-FAULTS------

15VDC=OK-14VDC-OK-VCC=OK

-INFO-LOCK-DETECT-=-OK--

REFERENCE-LOCK-DET-=-OK-

SYNTH-FAULTS:-SUM-LD=OK-

FINE-LD=OK--COARSE-LD=OK

-CONV-TEMPERATURE-=-OK--

--HIGH-SPEED-BUS-=-OK---

LEGEND

DISPLAY

---------SELECT---------

--MONITOR-STATUS-MENU---

KEY-PAD

ENT

CLR

Figure 18. Current Faults Menu Commands

---------SELECT---------

---STORED-FAULTS-MENU---

ENTER

TOTAL-FAULTS-STORED:--XX LAST-19:20:05---05/19/02

----CLEAR-ALL-STORED----

-------FAULTS?-NO-------

LEGEND

DISPLAY

---------SELECT---------

--MONITOR-STATUS-MENU---

ENT + UP to scroll thru Stored Faults

KEY-PAD

ENT

CLR

ST-FAULT-XX-----19:20:05 OK-FINE-LOCK----05/19/02

CLR to return

Figure 19. Stored Faults Menu Commands

DT4500 Series Down Converters MN/DT4500.IOM System Operation Revision 1

---------SELECT---------

-UTILITY-FUNCTIONS-MENU-

ENTER

----TIME:-10:22:05AM----

-----DATE:-05/19/02-----

---SERIAL-MODE=EIA232C-ADDR=XXX-BAUD=YYYY-P=ZZ-

-DISPLAY-CONTRAST-=-XX-DISPLAY-BRIGHTNESS-=-XX-

--REFERENCE-FREQUENCY---

----ADJUSTMENT-=-XXX----

---CONVERTER-SLOPE------

----ADJUSTMENT-=-X.X----

-------LAMP-TEST--------

-----------OFF----------

LEGEND

DISPLAY

---------SELECT---------

--MONITOR-STATUS-MENU---

KEY-PAD

ENT

CLR

Figure 20. Utility Function Menu Commands

DT4500 Series Down Converters MN/DT4500.IOM System Operation Revision 1

3.3.1 CONVERTER COMMANDS

The converter commands are in a tree structured menu format designed for access and execution of all control functions, and to prevent the execution of an invalid entry by the operator. When the prime power is turned on, the LCD display will contain a message indicating the converter model number and the version number of the firmware installed in the converter.

To select a Command Function press the "ENT" button on the keypad. The LCD display will indicate:

SELECT

CONFIGURATION MENU

This will provide the local operator access to the Command Function Menus, which is the top-level structure to start the selection of Command Function Menus to input into the converter. To sequence to the next Command Function Menu press a "DOWN" or "UP" arrow button on the keypad. The converter will step to the next Command Function Menu each time a "DOWN" or "UP" arrow button is pressed. The current Command Function Menu will be displayed on the LCD display. The Command Function Menus are shown in Figure 12.

To select a specific Command Function Menu press the "ENT" keypad button. If a function is selected in error, press the clear ("CLR") button, which will return the converter to the main command menus to allow the selection of another function. Any one of the six Command Function Menus can be selected using this procedure.

Once a Command Function has been selected, use the "RIGHT" or "LEFT" arrow keypad buttons to sequence through the Operating Mode Commands. Each of the modes will be displayed on the LCD display. A specific operating mode is selected by pressing the "ENT" button. If an mode is selected in error, press the clear ("CLR") button, which will return the converter to the operating menus to allow the selection of another mode.

When an operating mode is selected, a parameter or a digit within the parameter will be flashing on the LCD display. Use the "RIGHT" and "LEFT" arrows buttons to sequence through the parameters or digits to select the next parameter or digit. A specific parameter or value is selected by pressing the "ENT" button. If a parameter or value is selected in error, press the clear ("CLR") button, which will return the converter to the original parameter or value to allow another selection.

After selecting a parameter or digit, use the "UP" or "DOWN" arrow buttons to select the next parameter, or to increment or decrement the value of a digit. A specific new parameter or new value is selected by pressing the "ENT" button. If a parameter or value is selected in error, press the clear ("CLR") button, which will return the converter to the original parameter or value to allow another selection.

Each time the clear ("CLR") button is pressed, the converter will return to the menu level prior to the last "ENT" command.

DT4500 Series Down Converters MN/DT4500.IOM System Operation Revision 1

3.3.2 CONFIGURATION FUNCTIONS MENU

The Configuration Functions are as follows:

3.3.2.1 FREQUENCY OPERATING MODE

Frequency (FREQ):

Displays the current converter frequency in MHz, and allows the selection of a new frequency channel between RF

Low

to RF

MHz (e.g.; 10950.000 to

High

12750.000 MHz for Model DT-4513) in 125 KHz steps through keypad inputs.

Attenuation (ATTN):

Input and displays the converter attenuation setting which is selected between

0.00 to 20.00 in 0.25 dB steps. The default setting is 10.00 dB.

Rx: The converter is ON or OFF. The default mode is OFF.

3.3.2.2 EXTERNAL REFERENCE

External Reference:

The External Reference is displayed only when the 5 or 10 MHz external reference input to the converter is present.

3.3.2.3 ENTRY MODE/COLD START

The entry mode is Local or Remote. The default is Remote.

COLD Start:

The COLD Start Mode, if enabled, mutes the converter output signal for a predetermined time, 15 minutes, after power is applied to the converter to ensure that the reference oscillator is stable. The default mode is Disabled. This function is disabled in redundant systems.

3.3.2.4 FAULT RECOVERY

Fault Recovery:

Fault Recovery is Manual or Auto. The default is Auto.

3.3.2.5 REDUNDANCY MODE

Refer to Appendix A, Redundant System Operation.

3.3.3 PRE-SELECT FUNCTION MENU

3.3.3.1 D

Displays the frequency and attenuation pre-selects for the converter. One (1) to thirtytwo (32) frequencies can be pre-selected. If no frequencies have been pre-selected, the LCD display will indicate "NONE".

ISPLAY PRE-SELECT

DT4500 Series Down Converters MN/DT4500.IOM System Operation Revision 1

3.3.3.2 CONFIGURE CONVERTER TO PRE-SELECT

This command allows the local operator to pre-select from one (1) to thirty-two (32) frequencies to pre-set a programmed frequency channel and attenuation setting.

3.3.3.3 CLEAR DATA FROM PRE-SELECT

This command allows the local operator to clear a pre-set frequency and attenuation setting from a pre-selected converter.

3.3.3.4 PROGRAM PRE-SELECT

This command allows the local operator to input a pre-set frequency channel and attenuation settings into a converter.

3.3.4 MONITOR STATU S FUNCTION MENU

Monitors and displays the status of:

 15 and 14 Vdc power supplies.

 Converter internal temperature.

 IFLO tuning voltage level.

 Synthesizer Sum., Coarse and Fine Loop tuning.

3.3.5 CURRENT FAULTS FUNCTION MENU

Displays the status of the current fault conditions. The LCD display will indicate "FT" when a fault condition exists. The display will indicate "OK" when a fault has not occurred.

3.3.5.1 POWER FAULTS

Displays the DC voltage power supply faults.

 15 Vdc Power Supply.

 14 Vdc Power Supply.

 VCC voltage.

3.3.5.2 CONVERTER OSCILLATOR FAULTS

Displays the converter oscillator faults:

 IFLO Lock Detect.

 Reference Oscillator Lock Detect (only present if external reference is detected.).

DT4500 Series Down Converters MN/DT4500.IOM System Operation Revision 1

3.3.5.3 SYNTHESIZER FAULTS

Displays the synthesizer faults:

 Sum Loop Detect.

 Coarse Loop Detect.

 Fine Loop Detect.

3.3.5.4 CONVERTER OVER TEMPERATURE FAULT

Displays a converter temperature fault condition.

3.3.6 STORED FAULTS

The converter displays a total of one hundred (100) faults, which are date and time stamped and stored in memory as they occur. The stored faults remain in memory until a clear command is entered. When the number of faults reaches 100, the 100th fault will display ER.

3.3.6.1 TOTAL STORED FAULTS

Displays the total number of faults stored. The most recent fault stored is displayed on the LCD display.

3.3.6.2 CLEAR ALL STORED FAULTS

Input command to clear all faults. The command is "YES" or "NO' which is displayed on the LCD display.

3.3.6.3 DISPLAY STORED FAULT

The local operator can sequence through the stored faults starting with the most recent fault. The fault number, time, description and date are displayed on the LCD display.

DT4500 Series Down Converters MN/DT4500.IOM System Operation Revision 1

3.3.7 UTILITY FUNCTION MENU

The local operator can input commands to the following Utility Functions, which are displayed on the LCD display:

 TIME. Military time is used in hours, minutes and seconds.

 DATE. The date is displayed in month, day and year.

 Serial MODE (communications link).

 RS-485 or RS-232.

 Physical Address. The default address starts from one (001).

 BAUD (Rate). The default baud rate is 9600.

 PARITY. Even, Odd or None.

 Display Controls.

 DISPLAY CONTRAST. The default is 15, with values from 0 - 30.

 DISPLAY BRIGHTNESS. The default is 15, with values from 0 - 30.

 REF Adjust.

REFERENCE FREQUENCY ADJUSTMENT. The default tuning adjustment is 87, with values from 0 – 255

DT4500 Series Down Converters MN/DT4500.IOM System Operation Revision 1

NOTES:

Appendix A.

Redundant System Operation

Overview 41

Backup Converter 42

Redundant Configurations 43

A.1 OVERVIEW

The Comtech EF Data DT-4500 Series Down Converters are configured for redundant system operation using distributed protection switching in an active "Daisy Chain" configuration. Comtech EF Data's Proprietary "Daisy Chain" configuration distributes the converter protection switching functions in the converters.

This provides a system capability to backup from 1 to 12 online converters. A High Speed Bus (HSB) provides the communications interface between the backup and online converters to detect faults and reconfigure the subsystem to replace the failed converter.

When a faulted converter is removed from active operation, it is detached from the active converter chain by separating the converter from its switch module, leaving the active online converter chain intact through the switch module. The chain can be extended without affecting the online converter operation.

The active "chained" converters in a redundancy subsystem can also be indirectly controlled through the backup Converter using the remote serial communication link - this capability is discussed in Appendix B, Remote Control.

DT4500 Series Down Converters MN/DT4500.IOM Redundant System Operation Revision 1

A.2 BACKUP CONVERTER

The "Daisy Chain" terminates in the backup Converter. The backup Converter has a microprocessor, which performs fault detection, self-reconfiguration and the logical switching functions. If the backup Converter does not have a fault, it will assume the frequency and attenuation of the faulted converter and compensate for the chain losses. This capability is accomplished through the operation of the High Speed Bus (HSB) and the online converter detachable switch modules.

A.2.1 HIGH SPEED BUS (HSB)

In the "Daisy Chain" configuration, the backup Converter communicates with the online units through the high-speed interface bus (HSB). The backup Converter is able to detect faults and reconfigure itself to replace the faulted converter. The HSB interface is also used in the backup Converter to monitor configuration changes made to an online converter. Changes in frequency, gain, or polarity are immediately entered into the backup table as well as information from new online units. The high-speed bus does not interfere with the remote serial communication link access to any of the converters in the chain.

A.2.2 DETACHABLE MODULES

Comtech EF Data's converters are designed with a detachable Input/Output Module (IOM), which contain the signal path connectors. The IOM is utilized for single thread operation, or for testing of the unit.

For redundant "Daisy Chain" operations, the on-line Down Converters are provided with a detachable Receive Switch Module (RSM) replacing the IOM.

A.2.2.1 DOWN CONVERTER SWITCHING

The RSM contains IF switches for input/output looping of the signal. Options for the RSM include SMA connectors for the RF Input signal, and 50 or 75Ω BNC connectors

for the IF.

DT4500 Series Down Converters MN/DT4500.IOM Redundant System Operation Revision 1

REDUNDANT CONFIGURATIONS

Comtech EF Data DT-4500 Series Down Converters can be configured in several different redundant subsystem "Daisy Chain" configurations to meet the reliability requirements of a communication system. These configurations include:

Table 13. 4500 Series Down Converter Configurations

1:1 Redundant Subsystems

Single Source IF Output Configuration

The online converter uses an IF transfer switch to switch the IF signal. A single

switched IF output is provided to and from the online converter. The transfer switches are contained in the Receive Switch Module (RSM) installed in the online converter. When a fault occurs in the online converter, the RSM is de-activated to switch out the online converter, and switch the IF output to the backup Converter. Figure 21 is an illustration of the cable connections between the converters. Figure 22 is a block diagram of this 1:1 redundant converter configuration.

Dual Source IF Output Configuration

Two IF outputs, IF output #1 (priority) and IF output #2, are switched in the

Receive Switch Module (RSM) to provide redundant operation of the converters. The converters provide two switched IF outputs, IF output #1 (priority) and IF output #2. If converter #1 faults, converter #2 backs up the priority channel and IF signal #2 is not operational. Figure 25 is an illustration of the cable connections between the converters. Figure 26 is a block diagram of the 1:1 redundant, dual source RF input, converter configuration.

1:N Redundant Subsystems

An IF switch in the RSM is used to switch the IF output of a faulted online

converter to the backup Converter. Figure 27 is an illustration of the cable

connections between the converters.

Figure 28 is a block diagram of this 1:N redundant "Daisy Chain" converter configuration.

DT4500 Series Down Converters MN/DT4500.IOM Redundant System Operation Revision 1

LP OUTJ3 HSB

CUSTOMER

SUPPLIED

RF DIVIDER

IOM-XX

J4 J6 J8

OUTPUT

LP OUTLP IN RF

Figure 21. 1:1 Redundant Configuration - Single Source IF Output w/IOM and RSM-XX Installed

RF INPUT

DOWN CONVERTER - IOM

(BACKUP UNIT)

Customer

Supplied

LOAD

RF Divider

DOWN CONVERTER - RSM

IF OUTPUT

Figure 22. 1:1 Redundant Configuration Diagram - Single Source IF Output w/IOM and RSM-XX Installed

DT4500 Series Down Converters MN/DT4500.IOM Redundant System Operation Revision 1

Load

BU EQ

IF Out

LP Out

Down Converter - IOM

(Backup Unit)

RF In

LP In

Load

Down Converter - TSEQM

LP In

IF Out

EQ Out

(On line)

P1 - Pin 7

NO (Closed When EQ Faults)

LP Out

RF In

Figure 23. 1:1 Redundant Configuration Diagram -

Single Source RF Input with IOM-XX and TSEQM-XX Installed

J3 HSB

LP INJ8LP OUT

J10

EQ OUT

J11

EQ IN

RF OUT

LP IN

LP OUT

Figure 24. TSEQM Connection Locations

DT4500 Series Down Converters MN/DT4500.IOM Redundant System Operation Revision 1

IOM-XX

LP OUTJ3 HSB

J4 J6 J8

OUTPUT

LP OUTLP IN RF

OUTPUT

Figure 25. 1:1 Redundant Configuration - Dual Source IF Input

CUSTOMER

SUPPLIED

RF DIVIDER

OUTPUT

DOWN CONVERTER - IOM

(BACKUP UNIT)

DOWN CONVERTER - RSM

Figure 26 1:1 Redundant Configuration Diagram

Dual Source IF Output with IOM-XX and RSM-XX Installed.

RF INPUT

Customer

Supplied

RF Divider

DT4500 Series Down Converters MN/DT4500.IOM Redundant System Operation Revision 1

IOM-XX

LP IN

OUTPUT

J4 J6 J8

LP IN

LP OUT

BACKUP CONVERTER (BU)

CONVERTER No. 1

POL = 1

CONVERTER No. 2

POL = 2

INPUT

CUSTOMER

SUPPLIED

RF DIVIDER

POL = 1

INPUT

CUSTOMER

RF DIVIDER

POL = 2

SUPPLIED

CONN. J3 ON

CVTR. #3

CONN. J3 ON

CVTR. #(N-1)

OUTPUT

J4 J6 J8

IFJ3 HSB LP OUTLP IN

CONN. J6

CVTR. #3

CONN. J8 ON

CVTR. #(N-1)

CONVERTER No. N

LOAD

POL = 1

Figure 27. Dual Source1:N Redundant Configuration with PSM-XX and RSM-XX Installed

DT4500 Series Down Converters MN/DT4500.IOM Redundant System Operation Revision 1

RF INPUT

DOWN CONVERTER - PSM

(BACKUP UNIT)

DOWN CONVERTER - RSM #1

OUTPUT

DOWN CONVERTER - RSM #2

OUTPUT

DOWN CONVERTER - RSM #3

OUTPUT

Customer

Supplied

RF Divider

TO CONVERTER #4 IF (LP IN) CONN. J6

TO CONVERTER #N-1 IF (LP OUT) CONN. J8

LOAD

IF OUTPUT #N

DOWN CONVERTER - RSM #N

Figure 28. Dual Source 1:N Redundant Configuration Diagram

with PSM-XX and RSM-XX Installed

DT4500 Series Down Converters MN/DT4500.IOM Redundant System Operation Revision 1

A.3 REDUNDANT SYSTEM CONFIGURATION

A.3.1 INITIAL CONFIGURATION

Redundant system configuration is controlled from the converter’s front panel configuration menu. Each online unit is assigned a redundancy configuration address. This address is dependent on the location of the online converter with reference to the backup. The unit closest to the backup must be converter # 1. The next unit down must be converter # 2. Figure 29 shows the appropriate entries for a 1:3 system

STATUS

POWER ON

TRANSMIT

REMOTE

ON LINE

FAULT

STORED FAULT

REDUNDANCY-CONFIG?-ON---

-CONVERTER-#-BU---1:03--

STATUS

POWER ON

TRANSMIT

REMOTE

STATUS

POWER ON

TRANSMIT

ON LINE

FAULT

STORED FAULT

ON LINE

FAULT

REDUNDANCY-CONFIG?-ON---

-CONVERTER-#-01----POL-1

REDUNDANCY-CONFIG?-ON---

-CONVERTER-#-02----POL-1

REMOTE

STATUS

POWER ON

TRANSMIT

STORED FAULT

ON LINE

FAULT

REDUNDANCY-CONFIG?-ON---

-CONVERTER-#-03----POL-1

REMOTE

Configure the online units first, and then configure the backup unit. Redundant polling starts when the backup is configured. If this polling starts before the online units are configured, a high-speed bus fault will result. This fault should clear when configuration is completed. At this point, control of the redundant system is performed from the backup Converter.

STORED FAULT

Figure 29. 1:3 Front Panel Displays

DT4500 Series Down Converters MN/DT4500.IOM

Redundant System Operation Revision 1

In a single polarity system set “POL=1” on all online units. In a dual polarity system, where the BU has a Polarity Switch Module (PSM) installed, configure each unit to represent the RF feed it is connected to POL=1 or POL=2. See Figure 27.

A.3.2 AUTOMATIC CONFIGURATION VERIFICATION

The backup Converter has a menu that allows the operator to choose, on a converter-byconverter basis, manual (M) or automatic (A) operating mode.

Figure 30 shows the system configured for automatic (A) operation. In this mode, failure of an online converter will automatically cause a switchover to the redundant unit to occur. In the field, the simplest way to test this mode is to turn off an online unit. The AUTO/MANUAL selection is made in the converter. The online units will report their status as show in Figure 30.

STATUS

POWER ON

ON LINE

-CONVERTER-123456789ABC-

TRANSMIT

FAULT

-AUTO/MAN--AAA-----------

REMOTE

STORED FAULT

STATUS

POWER ON

TRANSMIT

REMOTE

STATUS

POWER ON

TRANSMIT

ON LINE

FAULT

STORED FAULT

ON LINE

FAULT

FREQ= 12XXX.XXX-MHz-AUTO

TTN= 10.00-DB---Tx=ON--

FREQ= 12XXX.XXX-MHz-AUTO

TTN= 10.00-DB---Tx=ON--

REMOTE

STATUS

POWER ON

TRANSMIT

STORED FAULT

ON LINE

FAULT

FREQ= 12XXX.XXX-MHz-AUTO

TTN= 10.00-DB---Tx=ON--

REMOTE

Figure 30. 1:3 System in AUTO Redundant Mode

STORED FAULT

DT4500 Series Down Converters MN/DT4500.IOM Redundant System Operation Revision 1

Figure 31 depicts the front panel displays after power has been turned off on converter #1. Note the on line LED is illuminated on the backup Converter. This indicates that the backup is now providing the frequency translation in place of the online unit. As soon as power is restored, converter #1 will come back online.

STATUS

POWER ON

TRANSMIT

REMOTE

STATUS

POWER ON

ON LINE

FAULT

STORED FAULT

ON LINE

CONV-01-OFFSET=+00.00-DB

-ACTIVATE-BACKUP:-ACTIVE-

TRANSMIT

REMOTE

POWER ON

TRANSMIT

REMOTE

POWER ON

TRANSMIT

REMOTE

FAULT

STORED FAULT

STATUS

ON LINE

FAULT

REDUNDANCY-CONFIG?-ON---

-CONVERTER-#-02---------

STORED FAULT

STATUS

ON LINE

FAULT

REDUNDANCY-CONFIG?-ON---

-CONVERTER-#-03---------

STORED FAULT

Figure 31. Converter #1 Being Backed Up

DT4500 Series Down Converters MN/DT4500.IOM

Redundant System Operation Revision 1

A.3.3 MANUAL CONFIGURATION/VERIFICATION

Figure 32 shows the system with converter #1 configured for manual(M) operation. In this mode, the backup Converter can force switchover of an online unit. This mode also overrides fault status detection of the online units performed by the backup Converter. If an online unit is configured to manual mode and this unit faults, no switchover will occur.

STATUS

POWER ON

ON LINE

-CONVERTER-123456789ABC-

TRANSMIT

FAULT

-AUTO/MAN-MAA-----------

REMOTE

STATUS

POWER ON

TRANSMIT

REMOTE

STORED FAULT

ON LINE

FAULT

STORED FAULT

FREQ= 12XXX.XXX-MHz-MAN-

TTN= 10.00-DB---Tx=ON--

STATUS

POWER ON

ON LINE

FREQ= 12XXX.XXX-MHz-AUTO

TRANSMIT

FAULT

TTN= 10.00-DB---Tx=ON--

REMOTE

STATUS

POWER ON

TRANSMIT

STORED FAULT

ON LINE

FAULT

FREQ= 12XXX.XXX-MHz-AUTO

TTN= 10.00-DB---Tx=ON--

REMOTE

Figure 32. Converter #1 in MANUAL, Others in AUTO

STORED FAULT

DT4500 Series Down Converters MN/DT4500.IOM Redundant System Operation Revision 1

Figure 33 shows the front panel displays after the backup has forced converter 1 offline. Note the online LED allows the user to tell whether the backup is currently active and which converter is being by passed.

STATUS

POWER ON

TRANSMIT

REMOTE

STATUS

POWER ON

TRANSMIT

ON LINE

FAULT

STORED FAULT

ON LINE

FAULT

CONV-01-OFFSET=+00.00-DB

-ACTIVATE-BACKUP:-FORCED-

REDUNDANCY-CONFIG?-ON---

-CONVERTER-#-01---------

REMOTE

STATUS

POWER ON

TRANSMIT

STORED FAULT

ON LINE

FAULT

REDUNDANCY-CONFIG?-ON---

-CONVERTER-#-02---------

REMOTE

STORED FAULT

STATUS

POWER ON

TRANSMIT

ON LINE

FAULT

REDUNDANCY-CONFIG?-ON---

-CONVERTER-#-03---------

REMOTE

STORED FAULT

Figure 33. Forced BU of Converter #1

DT4500 Series Down Converters MN/DT4500.IOM Redundant System Operation Revision 1

A.3.4 OFFSET ADJUSTMENT

The offset is used to compensate for cable and switch losses. When the system is initially set up and tested, each converter needs to be forced to backup and the offset adjusted to minimize gain mismatch between the normal and bypassed mode. This offset will be different for each converter and is stored in a table in the backup unit.

Set the offset as follows:

Connect a signal source to the input and a power meter or spectrum analyzer to the

output of the first online converter. Record the output power.

Force a backup of the first online unit and adjust the offset until the output power

matches what was recorded in step one.

Restore the online unit and repeat for the other online units.

A.3.5 REDUNDANCY SYSTEMS - CONVERTER REMOVAL

In a redundancy system, to remove an “inline” converter for repair the following procedure must be used:

Force backup of faulted unit.

Turn the power switch on the inline converter rear panel to OFF, and remove the power

cord from the converter. DO NOT disconnect the RF and IF cables from the RSM Module.

Unscrew the mounting screws on the RSM Module first, and then unscrew the rack

mounting screws on the front panel of the converter.

From the rear of the inline converter, hold the RSM Module and push the converter to

the front of the rack until RSM Module is free of the converter chassis.

Remove the inline converter from the front of the rack.

To install the replacement unit, the following procedure must be used:

Power up the new unit on the bench.

Configure the new unit for the correct redundancy settings (Redundant = ON, Address =

match old unit) and correct frequency and attenuation.

Power off the new unit.

Remove existing personality module from the new unit.

Carefully install the new unit into the rack. The existing module in the rack will be

plugged into the new unit.

Power up the new unit and un-force the backup.

DT4500 Series Down Converters MN/DT4500.IOM Redundant System Operation Revision 1

To remove a “Backup” converter for repair the following procedure must be used:

Turn the power switch on the backup Converter rear panel to OFF, and remove the

power cord from the converter. Disconnect the RF and IF cables from the IOM Module.

Unscrew the rack mounting screws on the front panel of the backup Converter.

Remove the backup Converter from the front of the rack.

DT4500 Series Down Converters MN/DT4500.IOM Redundant System Operation Revision 1

NOTES:

B.1 GENERAL

Each Comtech EF Data series Down Converter can be remotely controlled through a serial port. Primary (chained) converters in a redundancy subsystem can also be indirectly controlled through the backup Converter using virtual addressing. Comtech EF Data’s simplified Command/Response protocol is easily invoked by either a monitor and control computer, a non-intelligent ASCII terminal or a laptop computer operating in terminal emulation mode. All converter configuration parameters as well as all monitor and status information is available via the remote port.

Appendix B.

Remote Control

General 57

Protocol 58

Access Methods 59

Addresses 60

Message Structure 61

Command/Response Pairs 63

Error Processing 77

The Comtech EF Data converter family has been designed specifically to reduce the cost and complexity associated with operating in redundancy subsystem configurations. The backup Converter in the redundancy subsystem automatically monitors the configuration and status for each of the primary (chained) converters. This information is communicated via the High Speed Bus interface is updated at a polling rate of 1.95 milliseconds per primary converter. If a primary converter fails, the backup detects this event and automatically reconfigures itself to the proper frequency and attenuation setting providing minimal loss of traffic on the failed channel.

The result of this design is to greatly reduce the throughput requirements (i.e. polling rate) of earth station monitor and control systems. The backup Converter handles all of the ‘time critical’ tasks allowing the earth station monitor and control system to focus on less intelligent subsystems. This document specifies the remote control capabilities of the converter including hardware configuration and software command structure.

DT4500 Series Down Converters MN/DT4500.IOM Remote Control Revision 1

B.2 PROTOCOL

B.2.1 TRANSMISSION MODE

The transmission mode is half duplex implemented in Command/Response convention. This method requires the external system monitor and control unit to initiate all communications by command and all converters to respond with either confirmation or an error message. The confirmation may contain status information.

B.2.2 BAUD RATE

The default serial port Baud Rate is 9600. Baud rates of 1200, 2400, 4800, 19200, and 38400 are also supported.

B.2.3 FORMAT

The following parameters are the default character format.

 1 Start Bit

 8 Data Bits

 No Parity Bit

 1 Stop Bit

B.2.4 CHARACTER SET

The character set implemented is ASCII.

B.2.5 RESPONSE TIMEOUT

A minimum of 500 milliseconds should be provided before declaring a ‘no response’ instance, at which time the command should be re-transmitted.

B.2.6 BUS INACTIVITY REQUIREMENT

Comtech EF Data recommends that a minimum of 50 milliseconds bus inactivity be provided by the user between the receipt of a response from an addressed converter and issuing the next command on the serial bus.

DT4500 Series Down Converters MN/DT4500.IOM Remote Control Revision 1

B.3 ACCESS METHODS

Converters may be accessed directly by using a physical address or indirectly through a backup Converter by using a virtual address.

B.3.1 DIRECT ACCESS

Converters may be directly accessed by the RS-232C interface or by the RS-485 interface in a bus configuration.

B.3.1.1 RS-485

In this control network, all converters including the backup Converter are paralleled on a common RS-485 cable. Both up and down converters can be mixed on the cable as long as each converter has a unique physical address. Only one RS-485 port is required on the system's monitor and control computer. If a change is initiated directly to a converter in a redundancy subsystem, the backup Converter will detect the change via the High Speed Bus and update its backup tables.

B.3.1.2 RS-232

For RS-232 control, a direct RS-232 cable connection is made to each converter to be accessed. If an external Monitor and Control Computer is used, one RS-232 port per converter is required. This mode is commonly used with an ASCII terminal for bench testing.

B.3.2 INDIRECT ACCESS

Converters in Redundancy Mode may be addressed indirectly by adding a virtual address to the backup Converter's physical address. The virtual address corresponds to converter's position in the redundant subsystem. The backup Converter recognizes the virtual address and executes the command via the high-speed bus.

B.3.2.1 RS-485

To control by using the RS-485 interface, one or more backup Converters are connected to a system's monitor and control computer or ASCII terminal with a common RS-485 bus cable. Both up and down backup Converters may be mixed on the cable as long as each has a unique device address. In order to indirectly address an online converter in the subsystem, a virtual address must be provided. The virtual address corresponds to the converter's position in the chain beginning with number 1. Virtual addressing is only recognized by a backup Converter. Only one RS-485 port is required on the monitor and control computer.

DT4500 Series Down Converters MN/DT4500.IOM Remote Control Revision 1

B.3.2.2 RS-232

To control by using the RS-232 interface, one RS-232 port on the monitor and control computer is required for each backup Converter. Virtual addressing must be established by command. All converters including the backup Converter must be in the Redundancy Mode.

B.4 ADDRESSES

All converters are addressed in a command by the Device Address. The Device Address consists of a physical address or a physical address plus a virtual address.

B.4.1 PHYSICAL ADDRESS

Each converter in the system must have a unique physical address regardless of the access method used. The physical address consists of a string of 1, 2 or 3 numbers from 1 to 255. The physical address is entered into a converter via the front panel. For Direct Access, the physical address is the only address required to command a converter. A backup Converter or a stand-a-lone converter can only be accessed with a physical address.

Example: 10 Addresses converter whose physical address is 10.

B.4.2 VIRTUAL ADDRESS

In order to access a converter controlled by a backup Converter indirectly, a virtual address is required. A virtual address is appended to the physical address of the backup Converter with a "V". The virtual address is a number from 1 to 12, corresponds to the position of the active converter from the backup Converter, and is assigned by a configuration command.

Example: 10V3 Addresses the third converter controlled by the backup converter whose physical address is 10.

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B.5 MESSAGE STRUCTURE

The structure of a Command, Response or Error Message is as follows:

 Start Character.

 Device Address.

 Command or Response.

 End of Message String.

B.5.1 START CHARACTER

The Start Character begins each message:

Example: < Start of a user Command.

> Start of a converter response.

B.5.2 DEVICE ADDRESS

The Device Address consists of a Physical Address or a Physical Address and an appended Virtual Address. For this document, DEV is used for the generic case examples.

Example: <3V12

B.5.3 COMMAND

A Command is a variable length character string beginning with a / and containing either an instruction or an instruction and data for a converter to act upon. If data is passed by command, it is appended to the instruction by an underscore (_). If data is retrieved by, command underscore follows the instruction flagging the converter to supply data in a response. In this document /COM is used for the generic case examples.

Example: <DEV/COM_xxx'cr' Sends data to a converter.

Example: <DEV/COM_'cr' Requests information from a converter.

B.5.4 CONFIRMATION RESPONSE

A confirmation will change the start character, and echo the Device Address and Command. Any requested data will be appended to the Command.

Example: >DEV/COM_xxx'cr''lf']

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B.5.5 ERROR RESPONSE

If a converter cannot execute a Command or detects a protocol violation, an error response is generated. An error is flagged by changing the "/" command designator in the response to a "?". Following the "?" error symbol are two characters which are unique error symbols useful for computer analysis. The two error symbols are followed by a text string explaining the error for the convenience of a human operator. For this document, ER is used for the generic case examples response.

Example: >DEV?COM ER Error Message 'cr''lf']

B.5.6 END OF MESSAGE

End of message strings were devised in such a way that an orderly screen presentation would result when converters are controlled by simple ASCII terminals.

B.5.6.1 COMMAND ENDING

The end of message for a command is a carriage return. For this document, 'cr' is used for the carriage return.

Example: <DEV/COM_'cr'

B.5.6.2 RESPONSE ENDING

End of message for a response is a carriage return, line feed and a bracket: 'cr''lf'].

Example: >DEV/COM_'cr''lf']

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B.6 COMMAND/RESPONSE PAIRS

B.6.1 UTILITY COMMANDS

B.6.1.1 T

IME

Command Details

Set Time: <DEV/TIM_hh:mm:ss'cr' hh = Hour*

Confirmation: >DEV/TIM_hh:mm:ss'cr''lf'] mm = Minutes ss = Seconds

Retrieve Time: <DEV/TIM_'cr'

Confirmation: >DEV/TIM_hh:mm:ss'cr''lf']

* 24 hour military time is used.

B.6.1.2 DATE

Command Details

Set Date: <DEV/DAT_mm/dd/yy'cr' mm = Month

Confirmation: >DEV/DAT_mm/dd/yy'cr'lf'] dd = Day yy = Year

Retrieve Date: <DEV/DAT_'cr'

Confirmation: >DEV/DAT_mm/dd/yy'cr''lf']

B.6.1.3 PHYSICAL ADDRESS

The default Physical Address from is 1.

Command Details

Set Physical Address: <DEV/SPA_xxx'cr' xxx = 1 to 255

Confirmation: >DEV/SPA_xxx'cr''lf']

Retrieve Phys. Addr: <DEV/SPA_'cr'

Confirmation: >DEV/SPA_xxx'cr''lf']

B.6.1.4 BAUD RATE

The default baud rate is 9600.

Command Details

Set Baud Rate: <DEV/SBR_xxxx'cr' xxxx = 1200, 2400, 4800, 9600, 19K2, or 38K4

Confirmation: >DEV/SBR_xxxx'cr''lf']

Retrieve Baud Rate: <DEV/SBR_xxxx'cr'

Confirmation: >DEV/SBR_xxxx'cr''lf']

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B.6.1.5 LCD CONTRAST

The default is 15.

Command Details

Set Contrast: <DEV/CON_xx'cr' xx = 0 to 30

Confirmation: >DEV/CON_xx'cr''lf']

Retrieve Contrast: <DEV/CON_'cr'

Confirmation: >DEV/CON_xx'cr''lf']

B.6.1.6 LCD BRIGHTNESS

The default is 15.

Command Details

Set Brightness <DEV/LCD_xx'cr' xx = 0 to 30

Confirmation: >DEV/LCD_xx'cr''lf']

Retrieve Brightness: <DEV/LCD_'cr'

Confirmation: >DEV/LCD_xx'cr''lf']

B.6.1.7 REFERENCE OSCILLATOR TUNING

The default is 87.

Command Details

Set Oscillator: <DEV/SRO_xxx'cr' xxx = 0 to 255

Confirmation: >DEV/SRO_xxx'cr''lf']

Retrieve Tuning: <DEV/SRO_'cr'

Confirmation: >DEV/SRO_xxx'cr''lf']

B.6.1.8 CONVERTER SLOPE ADJUSTMENT

The default is 0.3.

Command Details

Set Slope Adjust: <DEV/SSA_xxx'cr' xxx = 0.0 to 1.0

Confirmation: >DEV/SSA_xxx'cr''lf']

Retrieve Slope Adjust: <DEV/SSA_'cr'

Confirmation: >DEV/SSA_xxx'cr''lf']

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B.6.1.9 EQUIPMENT TYPE

Equipment Type is a command that retrieves the model number and software version of the equipment. The information cannot be changed by command.

Command Details

Retrieve Equipment Type: <DEV/RET_'cr'

Confirmation: >DEV/RET_xxxxxxxxxx yyyyyyy'cr’’lf']

xxxxxxxxxx = Model Number yyyyyyy = Software Version.

B.6.1.10 FIRMWARE INFORMATION

Retrieves the firmware information of the unit.

Command Details

Retrieve Firmware Information:

Confirmation: >DEV/FRW_’cr’

<DEV/FRW_’cr’

BULK= FWnnnn-nr Ver=x.xx’cr’ M&C = FWnnnn-nr Ver=x.xx’cr’ FPGA= FWnnnn-nr Ver=x.xx’cr’’if’] Where: nnnn-n firmware number r firmware revision x.xx firmware version Note: BULK, M&C, and FPGA have different firmware

numbers, revisions, and versions among each other.

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B.6.1.11 APPLICATION IDENTIFICATION

The Application Identification (AID) command allows a free form message to be created. It is intended to identify the satellite, either transponder, beam, destination or other aspects of the application that may be significant to operations.

The message length corresponds to capability of the LCD and is 48 characters in total. The second line begins at character 25, therefore, blanks must be used after line 1 information in order to space to line 2. A carriage return ends the command. Trailing blanks will be generated to fill the LCD field. The AID display will alternate with the Equipment type display by use of the clear function key on the front panel. The default is "AID MESSAGE".

Command Details

Application ID: <DEV/AID_xxxxxxx ... xxxxx'cr'

Confirmation: >DEV/AID_'cr'

xxxxxxxxxxxxxxxxxxxxxxxx'cr' xxxxxxxxxxxxxxxxxxxxxxxx'cr''lf']

Retrieve ID: <DEV/AID_'cr'

Confirmation: >DEV/AID_'cr'

xxxxxxxxxxxxxxxxxxxxxxxx'cr' xxxxxxxxxxxxxxxxxxxxxxxx'cr''lf']

Note: xxxxxxx ... xxxxx = Your message, maximum 48 characters.

B.6.2 CONFIGURATION COMMANDS

B.6.2.1 F

REQUENCY

The default is RF

Command Details

Set Frequency: <DEV/FRE_xxxxx.xxx'cr'

Confirmation: >DEV/FRE_xxxxx.xxx'cr''lf']

Retrieve Frequency: <DEV/FRE_'cr'

Confirmation: >DEV/FRE_xxxxx.xxx'cr''lf']

Note: For example, xxxx.xxx = 14000.000 to 14500.000 MHz in 125 KHz steps for Model UT-

4514.

MHz (e.g.; 14000.000 MHz for Model UT-4514).

Low

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B.6.2.2 ATTENUATOR

The default is 10 dB.

Command Details

Set Attenuator: <DEV/ATT_ yy.yy'cr'

Confirmation: >DEV/ATT_yy.yy'cr'lf']

Retrieve Attenuator: <DEV/ATT_'cr'

Confirmation: >DEV/ATT_ yy.yy'cr''lf']

Note: yy.yy = 0.0 to 25.00 dB in 0.25 steps.

B.6.2.3 COLD START

The cold start function, if enabled, mutes the output signal for a predetermined time following Power-Up to ensure a stable reference oscillator (15 minutes). The default is OFF. This command is disabled in redundant systems (i.e. COMMAND NOT AVAILABLE).

Command Details

Set Cold Start: <DEV/CLD_xxx'cr' xxx = ON or OFF

Confirmation: >DEV/CLD_xxx'cr''lf']

Retrieve Status: <DEV/CLD_'cr'

Confirmation: >DEV/CLD_xxx'cr''lf']

B.6.2.4 MUTE

The default is ON.

Command Details

Mute Output: <DEV/MUT_xxx'cr' xxx = ON or OFF

Confirmation: >DEV/MUT_xxx'cr''lf']

Retrieve Mute Status:

Confirmation: >DEV/MUT_yyy'cr''lf']

<DEV/MUT_'cr'

yyy = ON/OFF/COLD

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B.6.2.5 AUTO FAULT RECOVERY

The converter output is automatically muted in the event of a detected fault. Auto Fault Recovery, if enabled, will cause the output signal to go active (unmuted) if all faults clear. If disabled, the output will remain muted even after all faults clear until a MUT_OFF command is received (see 4.8.2.4). If Auto Fault Recovery is enabled and the converter detects the same fault, more than five times in a five minute interval (ex: multiple IFLO lock detect faults) the function reverts to DISABLED and the converter remains muted. The default is ON.

Command Details

Set Fault Recovery: <DEV/AFR_xxx'cr' xxx = ON or 0FF

Confirmation: >DEV/AFR_xxx'cr''lf']

Retrieve Status: <DEV/AFR_'cr'

Confirmation: >DEV/AFR_xxx'cr''lf']

B.6.2.6 PROGRAM PRESET

This command is used to stores up to 32 preset frequency and attenuation settings.

Command Details

Program Preset: <DEV/PGM_nn_xxxxx.xxx_yy.yy'cr'

Confirmation: >DEV/PGM_nn_xxxxx.xxx_yy.yy'cr''lf']

Note: nn = Preset Number = 01 to 32.

xxxx.xxx = Frequency = RF

Model UT-4513).

yy.yy = Attenuator = 00.00 to 25.00.

B.6.2.7 DISPLAY ALL PRESETS

This command is used to display all programmed preset numbers.

Command Details

Display Presets: <DEV/DPS_'cr'

Confirmation: >DEV/DPS_'cr'

P01 xxxxx.xxx yy.yy'cr'

to P32 xxxxx.xxx yy.yy'cr''lf'] Where: xxxxx.xxx = Frequency yy.yy= Attenuator

Low

to RF

(for example, 10950.000 to 12750.000 MHz for

High

Note: Only programmed preset numbers are returned. If no preset(s) is programmed, “No Pre-

Selects Programmed” is returned.

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B.6.2.8 CLEAR PRESET

This command is used to clear a preset number.

Command Details

Clear a Preset: <DEV/CLR_nn'cr'

Confirmation: >DEV/CLR_nn_Cleared'cr''lf']

Note: nn = Preset Number = 01 to 32.

B.6.2.9 SELECT A PRESET

This command is used to configure the converter to the frequency and attenuation data assigned to a given preset number.

Command Details

Select Preset: <DEV/SEL_nn'cr'

Confirmation: >DEV/SEL_nn_Selected'cr''lf']

Note: nn = Preset Number = 01 to 32.

Only programmed preset numbers are available.

B.6.3 MODES

There are two modes of operation that may intersect: Redundant Mode and Automatic Mode.

B.6.3.1 REDUNDANCY MODE

Since the default mode is OFF, each converter including the backup Converter must be commanded into the Redundancy Mode.

Polling on the high-speed bus will not begin until the position assignments are made.

Command Details

Redundancy Mode: <DEV/RED_xxx'cr' xxx = ON or OFF

Confirmation: >DEV/RED_xxx'cr''lf']

Redundancy Status: <DEV/RED_'cr'

Confirmation: >DEV/RED_xxx'cr''lf']

Each converter's chain position must be initialized including the backup Converter. The following redundancy initialization command is only allowed if Redundancy Mode has been selected.

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Command Details

Initialize Command: <DEV/ICT_xx_yy'cr'

Confirmation: >DEV/ICT_xx_yy'cr''lf']

Initialize Status: <DEV/ICT_'cr'

Confirmation: >DEV/ICT_xx_yy'cr''lf']

xx = chain position = 01 to 12, or BU. Where BUselects the converter as the backup.

yy = chain length for xx = BU (i.e. Backup Converter) 01 to 12. yy = P1 or P2, single or dual polarity

Example 1: The following command assigns the converter chain position "1".

<DEV/ICT_01'cr'

>DEV/ICT_01'cr''lf']

Example 2: The following command assigns the receiving converter as the backup converter in a 1:8 system.

<DEV/ICT_BU_08'cr'

>DEV/ICT_BU_08'cr''lf']

It should be reiterated that only the converter physically located at the top of a redundant rack should be assigned as the Backup unit. Likewise, assignment of chain positions in a redundant rack should be made according to the physical allocation of each converter in the rack (i.e. The top converter should be the Backup, the second converter should be assigned chain position 1, the third converter position 2, etc.).

B.6.3.2 AUTOMATIC/MANUAL MODE

This command provides for automatic switching by the backup Converter if both units are in the Redundancy Mode. This command is only accepted by the backup Converter. If a chain converter is set in Manual Mode, the backup Converter will log the occurrence and not act upon further information from the converter until put into Automatic Mode. The default is off.

Command Details

Automatic Mode: <DEV/SAM_xx_y'cr'

Confirmation: >DEV/SAM_xx_y'cr''lf']

Automatic Status: <DEV/SAM_xx_'cr'

Confirmation: >DEV/SAM_xx_y'cr''lf']

Where: xx = 01 to 12, converter number y = A for Auto; M for Manual

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B.6.3.3 BACKUP MODE

This command allows the user to force a backup condition for maintenance and test purposes. This command must be sent to the converter designated as the backup Converter (i.e., “BU”). When activated this command forces the backup Converter to assume the state of the specified chain converter and forces the chain converter offline.

Command Details

Initiate a Backup: <DEV/FBU_xx_y'cr'

Confirmation: >DEV/FBU_xx_y'cr''lf']

Where: xx = 01 to 12, converter number y = ‘F’ to force a backup ‘N’ to remove a backup

Retrieve Backup Status:

Confirmation: >DEV/FBU_xx_zzzzz'cr''lf']

<DEV/FBU_'cr'

Where: xx = 01 to 12, converter number. If zzzzz = NONE, converter number is not displayed.

zzzzz = ‘NONE’ if no backup active = ‘ACTIVE’ if an automatic backup has occurred = ‘FORCED’ if a forced backup is active

B.6.4 STATU S COMMANDS

Status commands retrieve configuration, maintenance and alarm status in summary form.

B.6.4.1 CONFIGURATION STAT U S

Command Details

Configuration Status: <DEV/RCS_'cr'

Confirmation: >DEV/RCS_'cr'

FRE_xxxxx.xxx'cr' Frequency

ATT_yy.yy'cr' Attenuator RX_nnn'cr' Receive - ON/OFF/COLD ONL_nnn'cr' Online - ON/OFF RED_xx_yy_z'cr' See Note CLD_nnn'cr' Cold Start - ON/OFF AFR_nnn'cr' Auto Flt Recovery-ON/OFF EXT_xxx'cr''lf'] Ext. Ref. - YES/NO

Note: If Redundancy OFF, xx_yy_z = OFF. If Redundancy ON and converter selected as

backup controller, xx_yy_z = BU_yy where yy is the number of converters in the chain (i.e. 01 to 12). If Redundancy ON and converter is selected as a chain unit xx is the converter number (01 to 12), yy = P1 or P2 for single or dual polarity system, and z = A if Auto Mode or M if Manual Mode.

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B.6.4.2 MAINTENANCE STATUS

Command Details

Maintenance Status: <DEV/RMS_'cr'

Confirmation: >DEV/RMS_'cr'

P15_xx.x'cr' 15 Vdc Supply P14_xx.x'cr' 14 Vdc Supply VCC_x.x'cr' VCC Supply 5VD_x.x'cr' Display 5 Vdc TEM_xx'cr' Temperature IFL_xx.x'cr' IFLO Tuning SUM_xx.x'cr' Sum Loop Tuning COR_xx.x'cr' Coarse Loop Tune FIN_xx.x'cr''lf'] Fine Loop Tuning.

B.6.4.3 UTILITY STATUS

Command Details

Utility Status: <DEV/RUS_'cr'

Confirmation: >DEV/RUS_'cr'

COMM_aaaaaa'cr' RS-232 or RS-485 ADD_xxx'cr' Address (001 to 255) BR_nnnn'cr' Baud Rate (1200, 2400, 4800, 9600, 19K2, or 38K4) FMT_x-y-z’cr’ Data Format x=data, y=parity, z=stop bit (8-N-1, 7-E-2, 7-O-2) REF_xxx'cr' Osc. Adjust (000 to 255) SLP_x.x'cr' Slope Adjust (0.0 to 1.0) CON_xx'cr' LCD Contrast (0 to 30) LCD_xx'cr''lf'] LCD Brightness (0 to 30).

B.6.4.4 ALARM STATUS

Command Details

Alarm Status: <DEV/RAS_'cr'

Confirmation: >DEV/RAS_'cr'

Note: REF_xx is only returned if an external reference is present.

P15_xx'cr' 15 Vdc Fault P14_xx'cr' 14 Vdc Fault VCC_xx'cr' VCC Fault 5VD_xx'cr' 5VD Fault TEM_xx'cr' Temperature Fault IFL_xx'cr' IFLO Lock Fault SUM_xx'cr' Sum Lock Fault COR_xx'cr' Coarse Lock Fault FIN_xx'cr' Fine lock Fault HSB_xx’cr’ High Speed Bus Fault *REF_xx'cr''lf'] Ref. Lock Fault xx = OK or FT

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B.6.4.5 SUMMARY ALARM STATUS

Summary alarm is set to Fault (FT) if any of the items in Paragraph B.6.4.4 are faulted.

Command Details

Summary Alarm: <DEV/SAS_'cr' xx = OK or FLT

Confirmation: >DEV/SAS_xx'cr''lf']

B.6.4.6 TERMINAL STATUS CHANGE

The TSC_ command can be used to determine if the status of the terminal has changed since it was last polled. If any of the parameters listed in the RCS or RUS commands have changed as a result of user front panel operations or remote operations or if any new fault condition occur the TSC_ command will return YES. The TSC_ command will then continue to return YES until any of the following commands are received: RCS_, RUS_, RAS_, PACRCS_, PACRUS_, or PACRAS.

Configuration Status: <DEV/TSC_'cr'

Confirmation: >DEV/TSC_nnn'cr''lf'] nnn = YES/NO

B.6.4.7 PACKED CONFIGURATION STATU S

Configuration Status: <DEV/PACRCS_'cr' Confirmation: >DEV/PACRCS_aaaabbbcdeffgghijkl'cr''lf']

where: aaaa = # of 125kHz steps above base frequency1 bbb = # of 0.25 dB steps above 0.00 dB2 c = 1 if Transmitter ON, 0 if OFF, 2 if Cold d = 1 if unit ONLINE, 0 if OFFLINE e = 1 if Redundancy ON, else 0 ff = converter # (01-12,BU or 00 if e = 0) gg = 00 if 'ff' is 00 (redundancy OFF) gg = chain length (01-12) if 'ff' is BU gg = XX if 'ff' = 01 - 12 h = A if Auto Mode, M if Manual3 I = 1 if Cold Start Enabled, else 0 j = 1 if Auto recovery enabled, else 0 K = 1 if an Ext. Ref is present, else 0 l = 1 if Remote Mode, 0 if Local Mode

Notes: 1

If the converter is 1 kHz step size, this will be the number of 1 kHz steps above the base frequency

If the converter is 0.1 -dB step size, this will be the number of 0.1 -dB steps above

the base frequency

If it is a backup Converter, it is always ‘A’.

If it is the primary converter, gg = P1 or P2 (single or dual polarity system.

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B.6.4.8 PACKED MAINTENANCE STAT U S

Packed Maintenance Status: <DEV/PACRMS_'cr'

Confirmation: >DEV/PACRMS_aabbccddeeeffgghhii'cr''lf']

where: aa = V15 scaled 123mV per count (0x00 - 0xFF) bb = V14 scaled 123mV per count (0x00 - 0xFF) bc = VCC scaled 39mV per count (0x00 - 0xFF) dd = V5D scaled 39mV per count (0x00 - 0xFF) eee = signed Temperature in degrees C (-10 to +60) ff = IFLO tune scaled 67mV per count (0x00 - 0xFF) gg = SUM tune scaled 54mV per count (0x00 - 0xFF) hh = COARSE tune scaled 78mV per count(0x00 - 0xFF) ii = FINE tune scaled 89mV per count (0x00 - 0xFF)

B.6.4.9 PACKED UTILITY STATUS

Packed Utility Status: <DEV/PACRUS_'cr'

Confirmation: >DEV/PACRUS_abbcdeeffghhii'cr''lf']

where: a = 0=RS-232, 1=RS-485 bb = Address in hex (01 to FF) c = 0 if Baud Rate 38400 = 1 if Baud rate 19200 = 2 if Baud rate 9600 = 3 if Baud rate 4800 = 4 if Baud rate 2400 = 5 if Baud rate 1200 d = 0 if Data Format 8-N-1 = 1 if Data Format 7-E-2 = 2 if Data Format 7-O-2 ee = Osc. Adjust in hex (00 to FF) ff = Slope Adjust times by 10 (00 to 10) g = Always 0, unused hh = LCD Contrast (0 to 30) ii = LCD Brightness (0 to 30)

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B.6.4.10 PACKED ALARM STATUS

Packed Alarm Status: <DEV/PACRAS_'cr'

Confirmation: >DEV/PACRAS_abcdefghijk'cr''lf']

where:

a = 1 if V15 Fault, else 0 b = 1 if V14 Fault, else 0 c = 1 if VCC Fault, else 0 d = 1 if V5D Fault, else 0 e = 1 if TEMP Fault, else 0 f = 1 if IFLO Fault, else 0 g = 1 if SUM Fault, else 0 h = 1 if COARSE Fault, else 0 I = 1 if FINE Fault, else 0 j = 1 if HSB Fault, else 0 k = 1 if EXT REF Fault, else 0

B.6.5 STORED ALARM

The 100 alarms are date/time stamped and stored in memory as they occur. The alarm

entry is also updated with its date/time of clearance. The entry remains in memory until

it is removed by command.

B.6.5.1 TOTAL STORED ALARMS

This command retrieves the total number of stored alarms and the time and date of the

most recent alarm.

Retrieve Total Alarms: <DEV/TSA_'cr'

Confirmation: >DEV/TSA_TOTAL:nn'cr'

LAST:hh:mm:ss mm/dd/yy'cr''lf']

where:

nn = 0 to 99; the 100

alarm will be ER hh.mm.ss = time in hour:minute:second mm/dd/yy = date in month/day/year

B.6.5.2 CLEAR ALL STORED ALARMS

Clear Alarms: <DEV/CAA_YES'cr'

Confirmation: >DEV/CAA_CLEARED'cr''lf']

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B.6.5.3 LIST ALL ALARMS

This command retrieves a list of the stored alarms. This command is currently unavailable when using virtual addressing mode.

List All Alarms: <DEV/LAA_'cr'

Confirmation: >DEV/LAA_'cr'

xx yyyyyyyyyyy hh:mm:ss mm/dd/yy'cr'

" " " " " " " " xxx yyyyyyyyyyy hh:mm:ss mm/dd/yy'cr''lf']

Where:

xx = stored fault number yyyyyyyyyyy = fault description hh:mm:ss = fault time mm/dd/yy = fault date

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B.7 ERROR PROCESSING

B.7.1 GENERAL ERRORS

The following Error Responses may be generated by any command instead of a confirmation:

>DEV?COM CU CMD UNRECOGNIZED'cr''lf']

>DEV?COM IP INVALID PARAM'cr''lf']

>DEV?COM PE PARITY ERROR'cr''lf']

B.7.2 CONFIGURATION ERRORS

The following Error Responses may be generated by configuration commands:

>DEV?COM LO DEVICE IN LOCAL MODE'cr''lf']

B.7.3 MODE ERRORS

The following Error Responses may be generated by Mode selection:

>DEV?COM AE ONLY VALID WHEN BACKUP'cr''lf']

>DEV?COM OE OFFLINE NOT AVAILABLE'cr''lf']

>DEV?COM CN COMMAND NOT AVAILABLE'cr''lf']

B.7.4 TIME-OUTS

A time-out should be assumed if there is no response in 500 milliseconds. The station monitor and control computer should try at least three times.

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B.8 CONVERTER REMOTE COMMAND SUMMARY

Table 14. Remote Command Summary

Utility Commands Paragraph

Set Time <DEV/TIM_hh:mm:ss'cr' B.6.1.1

Set Date <DEV/DAT_mm/dd/yy'cr' B.6.1.2

Set Physical Address <DEV/SPA_xxx'cr' B.6.1.3

Set Baud Rate <DEV/SBR_xxxx'cr' B.6.1.4

Set LCD Contrast <DEV/CON_xx'cr' B.6.1.5

Set LCD Brightness <DEV/LCD_xx'cr' B.6.1.6

Set Reference Oscillator <DEV/SRO_xxx'cr' B.6.1.7

Set Converter Slope Adj. <DEV/SSA_xxx'cr' B.6.1.8

Retrieve Equipment Type <DEV/RET_'cr' B.6.1.9

Retrieve Firmware Information <DEV/FRW_'cr' B.6.1.10

Set Application ID Message <DEV/AID_xxxxx...xxxxx'cr' B.6.1.11

Configuration Commands Paragraph

Set Frequency <DEV/FRE_xxxxx.xxx'cr' B.6.2.1

Set Attenuation <DEV/ATT_xx.xx'cr' B.6.2.2

Select Cold Start Mode <DEV/CLD_xxx'cr' B.6.2.3

Mute/Unmute Converter <DEV/MUT_xxx'cr' B.6.2.4

Select Auto Fault Recovery Mode <DEV/AFR_xxx'cr' B.6.2.5

Program a Preset <DEV/PGM_nn_xxxxx.xxx_yy.yy'cr' B.6.2.6

Display All Presets <DEV/DPS_'cr' B.6.2.7

Clear a Preset <DEV/CLR_nn'cr' B.6.2.8

Select a Preset <DEV/SEL_nn'cr' B.6.2.9

Redundancy Mode Commands Paragraph

Select Redundancy ON/OFF <DEV/RED_xxx’cr’ B.6.3.1

Configure Redundant Converter <DEV/ICT_xx_yy’cr’ B.6.3.1

Select Auto/Manual Mode <DEV/SAM_xx_y'cr' B.6.3.2

Forced Backup Mode <DEV/FBU_xx_y'cr' B.6.3.3

DT4500 Series Down Converters MN/DT4500.IOM Remote Control Revision 1

Status Commands Paragraph

Retrieve Configuration Status <DEV/RCS_'cr' B.6.4.1

Retrieve Maintenance Status <DEV/RMS_'cr' B.6.4.2

Retrieve Utility Status <DEV/RUS_'cr' B.6.4.3

Retrieve Alarm Status <DEV/RAS_'cr' B.6.4.4

Summary Alarm Status <DEV/SAS_'cr' B.6.4.5

Terminal Status Change <DEV/TSC_'cr' B.6.4.6

Packed Configuration Status <DEV/PACRCS_'cr' B.6.4.7

Packed Maintenance Status <DEV/PACRMS_'cr' B.6.4.8

Packed Utility Status <DEV/PACRUS_'cr' B.6.4.9

Packed Alarm Status <DEV/PACRAS_'cr' B.6.4.10

Stored Alarm Commands Paragraph

Retrieve Total Stored Alarms <DEV/TSA_'cr' B.6.5.1

Clear All Stored Alarms <DEV/CAA_YES'cr' B.6.5.2

List All Stored Alarms <DEV/LAA_'cr' B.6.5.3

DT4500 Series Down Converters MN/DT4500.IOM Remote Control Revision 1

NOTES:

C.1 APPLICATIONS

This appendix contains a general description of the theory of operation for the Model DT4500 Series Down Converters. The DT-4500 Series Down Converters are used for SCPC, DAMA AND TDMA, as well as for full transponder HDTV and analog TV, applications.

The converter operates over the RF frequency range with a typical gain of 35 dB. The RF output level is +10 dBm at 1 dB compression allowing the capability for longer cable runs to compensate for splitting networks without adding options such as external line amplifiers.

Appendix C.

Theory of Operation

Applications 81

RF Signal Conversion 82

Monitor & Control 84

Installation, Operation and Maintenance 84

The phase noise performance exceeds the Intelsat phase noise mask for IBS and IDR services by more than 9 dB. This allows high capacity earth stations to add more demodulators and still meet transmission standards. The close-in phase noise is also very low make the converter ideal for low bit rate digital circuits such as used in DAMA hub earth stations.

A selectable RS-232C or RS-485 remote control serial communications connector interface is provided on the rear of the converter. All configuration control, status retrieval and adjustments are available as ASCII commands through the serial interface, or as local operator input command to the converter.

A detachable Input/Output Module (IOM) can be mounted in the rear of the converter chassis for switching the RF output for single thread operations, or for testing the output of the unit. The connectors for the IOM are located on the rear panel.

In applications where converters are "Daisy Chained" together to provide distributed online protection switching to a backup Converter, the IOM is replaced with a detachable Transmit Switch Module (TSM). The TSM contains RF and IF transfer switches. Type N connectors are provided for the RF loop, and 50 or 75 ohms BNC connectors are provided for the IF loop.

DT4500 Series Down Converters MN/DT4500.IOM Theory of Operation Revision 1

The "Daisy Chain" configuration is designed to chain the IF output of up to twelve (12) on-line converters together through RSM's terminating in a backup Converter. When a fault occurs in an on-line converter, the RSM in the converter with the fault is commanded to switch to the backup Converter. The backup Converter performs the fault detection, self-reconfiguration and the logical switching functions. If the backup Converter has a fault, it will not attempt to perform the protection-switching task. If the backup Converter does not have a fault, it will assume the frequency and attenuation of the faulted on-line converter, and compensate for the chain losses.

The backup Converter in the "Daisy Chain" communicates with the on-line converters through a high speed (data interface) bus (HSB). When faults are detected, the backup Converter re-configures itself to replace the on-line converter with the fault. The backup Converter also uses the HSB to monitor configuration changes made to the on-line converters by either remote control or front panel command inputs. Changes in frequency, attenuation or polarity are entered into the backup table as they are made, as well as information from new on-line units. The HSB does not interfere with the remote control communications link for access to any of the converters in the "Daisy Chain".

The DT-4500 Series Down Converters are a standard 19 inch rack mounted units, 1.75 inches in height. The converter is 22 inches deep, and weighs 25 pounds. Prime power the converter can be either 100 to 125 Vac, or 205 to 240 Vac, at 47 to 63 Hz (or provided with an optional -48 Vdc prime power input). The power dissipation is 60 watts. The converter can operated in a temperature environment of 0 to 50 degrees C at 10,000 feet altitude in 0 to 95% relative humidity.

C.2 RF SIGNAL CONVERSION

As a typical example of the RF signal processing, the RF input to the DT-4512 Down Converter is 12200 to 12750 MHZ at a typical level of -45 dBm. The RF is mixed in the first mixer with a 13280 to 13830 MHZ synthesizer signal from a multiplier, in 125 KHz fine tuning steps. The synthesizer is locked to a 5/10 MHZ reference oscillator. The first mixer is located in the converter Signal Path Module, and the synthesizer consists of a Coarse/Fine Step Module and a Sum Loop Module.

The intermediate IF is 1080 MHZ which is mixed in the second mixer with the1150 MHZ IFLO providing a +20 dBm, at 1 dB compression, 70 MHZ IF output. The second mixer is also located in the converter Signal Path Assembly.

Figure 34 is a typical functional block diagram of the converter.

Comtech EF Data DT-4500 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Errata A

Errata B

CUSTOMER SUPPORT

Errata C

Table of Contents

ABOUT THIS MANUAL

CONVENTIONS AND REFERENCES

CAUTIONS AND WARNINGS

METRIC CONVERSION

TRADEMARKS

REPORTING COMMENTS OR SUGGESTIONS CONCERNING THIS MANUAL

EMC COMPLIANCE

EN55022 COMPLIANCE

EN50082-1 COMPLIANCE

FEDERAL COMMUNICATIONS COMMISSION (FCC)

SAFETY COMPLIANCE

EN 60950

LOW VOLTAGE DIRECTIVE (LVD)

WARRANTY POLICY

LIMITATIONS OF WARRANTY

EXCLUSIVE REMEDIES

DISCLAIMER

REDUNDANT CONFIGURATIONS