Comtech EF Data SNM-1001L User Manual

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SNM-1001L

Satellite Modem

Installation and Operation Manual

Part Number MN/SNM1001L.IOM Revision 1

Errata A

Comtech EF Data Documentation Update

Subject:

Date:

Document:

Part Number: Collating Instructions:

Comments:

The following changes provide updated information for page xii and Section 3.2.9. This information will be incorporated into the next revision.

Change Specifics:

Changes to power consumption and fusing information

May 30, 2003

SNM-1001L Satellite Modem Installation and Operation Manual, Rev. 1, dated March 17, 2003

MN/SNM1001L.EA1

Attach this page to page xii

ELECTRICAL SAFETY

The SNM-1001L Satellite Modem has been shown to comply with the following safety standard:

• EN 60950: Safety of Information Technology Equipment, including electrical business machines.

The equipment is rated for operation over the range 85 to 264 volts AC. It has a maximum

power consumption of 55 watts without BUC power supply. Input power increases to 175W with 100W, 24V BUC power supply at maximum load. Input power increases to 230W with 150W, 48V BUC power supply at maximum load.

FUSES

The SNM-1001L Satellite Modem is fitted with two fuses, one each for line and neutral connections. These are contained within the body of the IEC power connector, behind a small plastic flap.

• Use T3.15A, 20mm fuses.

For continued operator safety, always replace the fuses with the

IMPORTANT

correct type and rating.

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3.2.9 AC Power Connector

A standard, detachable, non-locking, 3-prong power cord (IEC plug) supplies the Alternating Current (AC) power to the modem. Observe the following:

Input Power

Input Voltage

Connector Type Fuse Protection

55W maximum, 40W typical

without BUC power supply.

90 to 132 or 175 to 264 VAC Unit switches ranges automatically I.E.C

T3.15A 20 mm type fuses Line and neutral fusing

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SNM-1001L

Satellite Modem

Installation and Operation Manual

Part Number MN/SNM1001A.IOM

Comtech EF Data is an ISO 9001

Registered Company.

MULTIMEDIA INTEGRATED DIGITAL ACCESS SYSTEM

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

Revision 1

March 17, 2003

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.

Be prepared to supply the Customer Support representative with the model

number, serial number, and a description of the problem.

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

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

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

Table of Contents

Customer Support........................................................................................................................................ i

About this Manual ...................................................................................................................................xiii

Electrical Safety ........................................................................................................................................xv

Telecommunications Terminal Equipment Directive...........................................................................xvi

EMC (Electromagnetic Compatibility).................................................................................................xvii

Warranty Policy .....................................................................................................................................xviii

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

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

1.2 Options Summary ....................................................................................................................... 1–2

1.3 Comtech EF Data Part Numbers............................................................................................... 1–3

1.4 FAST Accessible Options ...........................................................................................................1–4

1.5 Compatibility............................................................................................................................... 1–5

1.6 Description of the Modulator..................................................................................................... 1–5

1.6.1 Overview............................................................................................................................... 1–5

1.6.2 Functional Description.......................................................................................................... 1–5

1.6.3 Description of Modulation Types ......................................................................................... 1–6

1.7 Description of the Demodulator................................................................................................. 1–9

1.7.1 Overview............................................................................................................................... 1–9

1.7.2 Functional Description........................................................................................................ 1–10

1.8 Description of Monitor & Control........................................................................................... 1–11

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1.8.1 Overview............................................................................................................................. 1–11

1.8.2 Functional Description........................................................................................................ 1–12

1.9 Dimensional Envelope .............................................................................................................. 1–14

1.10 New in this Release.................................................................................................................... 1–15

CHAPTER 2. INSTALLATION/ UPGRADES ........................................................................2–1

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

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

2.2.1 Modem Installation (Optional).............................................................................................. 2–2

2.3 Software and Hardware Installation/Upgrades .......................................................................2–4

2.3.1 Reed-Solomon PCB .............................................................................................................. 2–4

2.3.2 Turbo Codec Installation....................................................................................................... 2–6

2.4 Data I/O Interface Connector (J8) Removal/Installation........................................................ 2–8

2.5 Hardware Upgrades.................................................................................................................... 2–9

2.5.1 Main PCB Firmware Chips................................................................................................... 2–9

2.6 Flash Upgrading........................................................................................................................2–11

2.6.1 Downloading Flash Updates from the Web ........................................................................ 2–12

CHAPTER 3. CONNECTOR PINOUTS.................................................................................3–1

3.1 Connector Overview ................................................................................................................... 3–1

3.2 Connector Description................................................................................................................ 3–3

3.2.1 Remote Connector and Pinouts (J6)...................................................................................... 3–3

3.2.2 Fault Connector and Pinouts (J7).......................................................................................... 3–4

3.2.3 Data I/O Interface Connector (J8)......................................................................................... 3–5

3.2.4 Auxiliary 1 Connector and Pinouts (J9)................................................................................ 3–9

3.2.5 Alarms Connector and Pinouts (J10) .................................................................................. 3–10

3.2.6 RF Output Connector (CP1) ...............................................................................................3–10

3.2.7 External Reference (CP2) ...................................................................................................3–10

3.2.8 RF Input Connector (CP3) .................................................................................................. 3–10

3.2.9 AC Power Connector .......................................................................................................... 3–11

3.2.10 Ground Connector (GND) ..................................................................................................3–11

CHAPTER 4. FRONT PANEL OPERATION......................................................................... 4–1

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

4.1.1 LED Indicators The 10 LEDs on the front panel indicate: • General modem summary faults

• Status • Alarms The indicators are defined in Table 4-1 as follows:............................................ 4–2

4.1.2 Front Panel Keypad............................................................................................................... 4–3

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4.2 Menu System ...............................................................................................................................4–4

4.2.1 Revision Emulation............................................................................................................... 4–5

4.2.2 Menu Tree............................................................................................................................. 4–6

4.3 OPENING SCREEN................................................................................................................... 4–7

4.3.1 FUNCTION SELECT: CONFIGURATION........................................................................ 4–7

4.3.2 FUNCTION SELECT: MONITOR .................................................................................... 4–39

4.3.3 FUNCTION SELECT: FAULTS/ALARMS...................................................................... 4–46

4.3.4 FUNCTION SELECT: STORED FLTS/ALMS................................................................. 4–50

4.3.5 FUNCTION SELECT: REMOTE AUPC (CONDITIONAL)......................................... 4–55

4.3.6 FUNCTION SELECT: UTILITY....................................................................................... 4–58

FUNCTION SELECT:UTILITY: DEMODULATOR: RX TERMINAL LO ................................... 4–70

FUNCTION SELECT: UTILITY: INTERFACE: BUFFER PROGRAM ..................................... 4–76

FUNCTION SELECT: UTILITY: OUTDOOR UNIT: ODU FSK ADDRESS (CONDITIONAL) .4– 78

4.4 Custom Modem Defaults .......................................................................................................... 4–97

CHAPTER 5. MODEM TYPE............................................................................................... 5–1

5.1 Modem Type................................................................................................................................ 5–1

5.1.1 AUPC Operation (with Reed-Solomon) ............................................................................... 5–2

5.1.2 Closed Network Operation (Comtech EF Data) ...................................................................5–2

5.2 Custom Operation....................................................................................................................... 5–3

5.3 Reed-Solomon Modes .................................................................................................................5–4

CHAPTER 6. CLOCKING AND RX BUFFERING SETTINGS.............................................6–1

6.1 Clocking Options......................................................................................................................... 6–1

6.1.1 EIA-232, EIA-422, or V.35 Master/Master .......................................................................... 6–1

6.1.2 EIA-232, EIA-422, or V.35 Master/Slave ............................................................................6–1

6.2 Buffering ...................................................................................................................................... 6–2

6.2.1 Buffer Size ............................................................................................................................ 6–2

6.3 Doppler......................................................................................................................................... 6–7

6.4 Plesiochronous............................................................................................................................. 6–8

6.5 Frame/Multiframe Length ......................................................................................................... 6–9

6.5.1 Multiples of the Frame Length.............................................................................................. 6–9

6.5.2 Total Buffer Length ..............................................................................................................6–9

6.5.3 Converting Between Bits and Seconds ................................................................................. 6–9

CHAPTER 7. FORWARD ERROR CORRECTION (FEC) ....................................................7–1

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7.1 Introduction................................................................................................................................. 7–1

7.2 Coding .......................................................................................................................................... 7–2

7.3 Turbo Product Codec (Hardware Option) ............................................................................... 7–2

7.3.1 Introduction...........................................................................................................................7–2

7.3.2 Mod/Demod Processing Delay .............................................................................................7–3

7.3.3 Comparison of all TPC Modes.............................................................................................. 7–4

7.4 Uncoded Operation (No FEC) ...................................................................................................7–5

CHAPTER 8. SYSTEM CHECKOUT..................................................................................... 8–1

8.1 System Checkout......................................................................................................................... 8–1

8.1.1 Interface Checkout ................................................................................................................ 8–2

8.1.2 Modulator Checkout .............................................................................................................8–3

8.1.3 Demodulator Checkout ........................................................................................................... 8–5

CHAPTER 9. FAULT ISOLATION ........................................................................................9–1

9.1 Fault Isolation.............................................................................................................................. 9–1

9.1.1 System Faults/Alarms ........................................................................................................... 9–2

9.1.2 Faults/Alarms Display........................................................................................................... 9–2

9.1.3 Faults/Alarms Analysis......................................................................................................... 9–2

CHAPTER 10. AUTOMATIC UPLINK POWER CONTROL.................................................10–1

10.1 AUPC ......................................................................................................................................... 10–1

10.2 Modes of AUPC Location......................................................................................................... 10–3

10.2.1 AUPC – Between Two Modems......................................................................................... 10–4

10.2.2 Self-Monitoring Local Modem AUPC Control .................................................................. 10–5

10.2.3 MUX Operation .................................................................................................................. 10–6

10.2.4 DEMUX Operation............................................................................................................. 10–6

10.2.5 Buffer Operation ................................................................................................................. 10–6

10.2.6 Loop Timing Operation ......................................................................................................10–7

10.2.7 Baseband Loopback Operation ........................................................................................... 10–7

10.2.8 Front Panel Operation ......................................................................................................... 10–7

CHAPTER 11. ASYMMETRICAL LOOP TIMING .................................................................11–1

11.1 Asymmetrical Loop Timing .....................................................................................................11–1

CHAPTER 12. FULLY ACCESIBLE SYSTEM TOPOLOGY (FAST)................................... 12–1

12.1 FAST System Theory................................................................................................................ 12–1

12.1.1 Implementation ................................................................................................................... 12–1

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12.2 Variable Data Rates .................................................................................................................. 12–5

CHAPTER 13. BUC FSK COMMUNICATIONS ....................................................................13–1

13.1 Introduction............................................................................................................................... 13–1

13.1.1 Transmission Interface........................................................................................................ 13–2

13.2 Message Structure..................................................................................................................... 13–2

13.2.1 Command Message Structure (IDU to ODU)..................................................................... 13–2

13.2.2 Response Message Structure (BUC to IDU)....................................................................... 13–3

13.3 Power Class................................................................................................................................ 13–3

CHAPTER 14. DECODER................................................................................................... 14–1

14.1 Decoder ...................................................................................................................................... 14–1

14.1.1 Sequential Decoder ............................................................................................................. 14–1

14.1.2 Viterbi Decoder................................................................................................................... 14–3

CHAPTER 15. REED-SOLOMON CODEC .........................................................................15–1

15.1 Reed-Solomon Codec ................................................................................................................ 15–1

15.1.1 Specifications...................................................................................................................... 15–2

15.1.2 Theory of Operation............................................................................................................ 15–2

15.1.3 Reed-Solomon Encoder ......................................................................................................15–3

15.1.4 Reed-Solomon Decoder ...................................................................................................... 15–5

APPENDIX A SPECIFICATION............................................................................................ A–1

A.1 Specifications .............................................................................................................................. A–1

A.2 Specification Summary.............................................................................................................. A–2

A.3 L-Band Modulator Specification Summary ............................................................................ A–3

A.4 Demodulator Specification Summary ......................................................................................A–4

A.5 L-Band Modulator Specifications............................................................................................. A–5

A.5.1 Digital Data Rate.................................................................................................................. A–5

A.5.2 Modulation and Encoding Types ......................................................................................... A–6

A.5.3 Scrambling Types ................................................................................................................A–7

A.5.4 Modulator Frequency Reference.......................................................................................... A–7

A.5.5 Modulator Spurious Emissions ............................................................................................ A–8

A.5.6 Modulator Phase Noise ........................................................................................................ A–8

A.5.7 Modulator IF Output Spectrum Shape ................................................................................. A–8

A.5.8 L-Band INMARSAT Spurious Emissions ........................................................................... A–8

A.5.9 Differential Encoder............................................................................................................. A–9

A.5.10 BPSK Bit Ordering .............................................................................................................. A–9

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A.5.11 Interleaver (Reed-Solomon Codec)...................................................................................... A–9

A.5.12 Modulator Transmit Frequency (IF) .................................................................................... A–9

A.5.13 Transmit Frequency Change Time....................................................................................... A–9

A.5.14 Modulator Transmit IF Output Switch................................................................................. A–9

A.5.15 Modulator Transmit IF Power.............................................................................................. A–9

A.5.16 Modulator Power Offset..................................................................................................... A–10

A.5.17 Modulator I / Q Imbalance................................................................................................. A–10

A.5.18 Modulator Output Noise Floor........................................................................................... A–10

A.5.19 Modulator Spectrum Rotation............................................................................................ A–10

A.5.20 Modulator Output Return Loss .......................................................................................... A–10

A.5.21 L-Band ODU Reference Signal ......................................................................................... A–10

A.5.22 L-Band ODU Control and Monitor.................................................................................... A–10

A.5.23 Modulator Transmit IF Test Modes................................................................................... A–10

A.5.24 L-Band ODU Supply Voltage............................................................................................ A–11

A.5.25 ODU DC Current Sense..................................................................................................... A–11

A.6 Encoding ................................................................................................................................... A–11

A.6.1 BPSK Encoding ................................................................................................................. A–11

A.6.2 OQPSK Encoding .............................................................................................................. A–12

A.6.3 8-PSK Encoding................................................................................................................. A–12

A.7 L-Band Demodulator Specifications ...................................................................................... A–13

A.7.1 Digital Data Rate................................................................................................................ A–13

A.7.2 Demodulation and FEC Decoding Types .......................................................................... A–14

A.7.3 Descrambling Types .......................................................................................................... A–15

A.7.4 Differential Decoder .......................................................................................................... A–15

A.7.5 BPSK Bit Ordering ............................................................................................................ A–15

A.7.6 Deinterleaver (Reed-Solomon Codec) ............................................................................... A–15

A.7.7 Demodulator Spectrum Rotation ....................................................................................... A–15

A.7.8 Receive Frequency ............................................................................................................. A–16

A.7.9 Input Overload ...................................................................................................................A–16

A.7.10 Demodulator Input Return Loss......................................................................................... A–16

A.7.11 LNB Prime Power.............................................................................................................. A–16

A.7.12 LNB Band Control............................................................................................................. A–16

A.7.13 LNB Reference Signal ....................................................................................................... A–16

A.7.14 Receive Input Power (Composite) ..................................................................................... A–17

A.7.15 Demodulator Input Shape .................................................................................................. A–17

A.7.16 Receive Input Power (Desired Carrier).............................................................................. A–18

A.7.17 Demodulator Channel Spacing/Adjacent Carrier Performance ......................................... A–18

A.8 Bit Error Rate Performance ................................................................................................... A–19

A.8.1 Performance With Noise, Viterbi Decoder, and Closed Network ..................................... A–19

A.8.2 Performance with Noise, Viterbi Decoder, and Reed-Solomon (Optional).................... A–19

A.8.3 Performance With BPSK and {O}QPSK BER Performance ............................................ A–19

A.8.4 Performance with Noise Turbo Product Codec (Optional)................................................ A–20

A.8.5 Performance With Noise, 1544 kbps Sequential Decoder and Reed Solomon(Optional) A–20

A.8.6 Performance With Noise, 56 kbps Sequential Decoder (Optional) ................................... A–20

A.8.7 Performance With Noise, 1544 kbps Sequential Decoder (Optional) ............................... A–21

A.8.8 BER Threshold................................................................................................................... A–21

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A.9 Acquisition Time ......................................................................................................................A–22

A.9.1 Receive Carrier Acquisition Range.................................................................................... A–23

A.9.2 Receive Carrier Reacquisition ........................................................................................... A–23

A.9.3 AGC Output ....................................................................................................................... A–23

A.9.4 Doppler Tracking Performance.......................................................................................... A–23

A.10 Interface Specifications........................................................................................................ A–24

A.10.1 TX Clock Switching Due to Failure of Selected Clock ..................................................... A–24

A.10.2 TX Clock Phase Adjustment.............................................................................................. A–24

A.10.3 TX Data Phase Adjustment................................................................................................ A–24

A.10.4 Transmit Clock Source....................................................................................................... A–24

A.10.5 Send Clock Timing Source ................................................................................................ A–24

A.10.6 Doppler/Plesiochronous Buffer Clock Source ................................................................... A–25

A.10.7 RX Clock Switching Due to Failure of Selected Clock..................................................... A–25

A.10.8 RX Clock Phase Adjustment.............................................................................................. A–25

A.10.9 RX Clock Jitter .................................................................................................................. A–25

A.10.10 RX Data Phase Adjustment............................................................................................ A–25

A.10.11 Buffer Centering ............................................................................................................ A–25

A.10.12 Receive Doppler/Plesiochronous Buffer Size................................................................ A–26

A.10.13 Switch Faults.................................................................................................................. A–26

A.11 Decoding................................................................................................................................ A–26

A.11.1 BPSK Decoding ................................................................................................................. A–26

A.11.2 QPSK Decoding................................................................................................................. A–26

A.11.3 Offset QPSK Decoding (Optional) .................................................................................... A–27

A.11.4 8-PSK Decoding ................................................................................................................ A–27

A.12 Terrestrial Interface Types ................................................................................................. A–28

A.12.1 EIA-232 Specification........................................................................................................ A–28

A.12.2 V.35 Specification V.10, V.11 Specification, Circuit Supported ...................................... A–29

A.12.3 EIA-449/EIA-422 Mil-188-114A Specification ................................................................ A–30

A.13 AUPC Specification (Optional)........................................................................................... A–31

A.13.1 AUPC Parameters .............................................................................................................. A–32

A.13.2 AUPC with Reed-Solomon Option.................................................................................... A–32

A.13.3 Turbo AUPC ...................................................................................................................... A–32

A.14 System Specifications........................................................................................................... A–33

A.14.1 Loopback Modes................................................................................................................ A–33

A.14.2 Test Modes......................................................................................................................... A–33

A.14.3 Remote Control.................................................................................................................. A–34

A.14.4 Modem Remote Address.................................................................................................... A–34

A.14.5 Monitored Signals.............................................................................................................. A–34

A.15 Stored Faults......................................................................................................................... A–35

A.16 Stored Configurations.......................................................................................................... A–35

A.17 Interoperability Modes ........................................................................................................ A–35

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APPENDIX B. REMOTE CONTROL OPERATION.............................................................. B–1

B.1 General ............................................................................................................................................. B–1

B.2 Message Structure ........................................................................................................................... B–2

B.2.1 Start Character............................................................................................................................ B–2

B.2.2 Device Address .......................................................................................................................... B–2

B.2.3 Command/Response................................................................................................................... B–3

B.2.4 End Character............................................................................................................................. B–4

B.3 Configuration Commands/Responses............................................................................................B–5

B.3.1 Modulator Configuration Commands ........................................................................................ B–5

B.3.2 Demodulator Configuration Commands .................................................................................... B–7

B.3.3 Interface Configuration Commands ........................................................................................... B–9

B.3.4 System Configuration Commands............................................................................................ B–11

B.3.5 Automatic Uplink Power Control (AUPC) .............................................................................. B–12

B.4 Status Commands/Responses ....................................................................................................... B–14

B.4.1 Modulator Configuration Status............................................................................................... B–14

B.4.3 ODU Configuration Status................................................................................................ B–19

B.4.4 Fault Status........................................................................................................................ B–20

B.4.2 Error Performance .................................................................................................................... B–21

B.5 Stored Faults.................................................................................................................................. B–24

APPENDIX C. BURST MODE MODULATOR OPERATION .............................................. C–1

C.1 Burst Mode Modulator: Theory of Operation ........................................................................ C–1

C.1.1 Burst Mode........................................................................................................................... C–1

C.2 Burst Mode Modulator: Specifications .................................................................................... C–2

C.2.1 Digital Data Rate.................................................................................................................. C–2

C.2.2 Modulation and Encoding Types ......................................................................................... C–2

C.2.3 Scrambling Types ................................................................................................................C–3

C.2.4 Differential Encoder............................................................................................................. C–3

C.2.5 Transmit Frequency (IF) ...................................................................................................... C–3

C.2.6 Frequency Reference............................................................................................................ C–3

C.2.7 Transmit Frequency Change Time....................................................................................... C–3

C.2.8 Phase Noise.......................................................................................................................... C–4

C.2.9 Transmit IF Output Switch .................................................................................................. C–4

C.2.10 Transmit IF Power ...............................................................................................................C–4

C.2.11 Modulator Power Offset....................................................................................................... C–4

C.2.12 Modulated IF Output Shape ................................................................................................. C–4

C.2.13 Spurious Emissions ..............................................................................................................C–5

C.2.14 Modulator Phase Error ......................................................................................................... C–5

C.2.15 Transmit IF Test Modes ....................................................................................................... C–5

C.2.16 Modulator Spectrum Rotation.............................................................................................. C–5

C.2.17 Transmit Preamble ...............................................................................................................C–6

C.2.18 Transmit Packet ................................................................................................................... C–6

C.2.19 Transmit Postamble ............................................................................................................. C–6

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C.3 Burst Mode Demodulator: Theory of Operation ....................................................................C–7

C.3.1 Burst Mode........................................................................................................................... C–7

C.4 Burst Mode Demodulator: Specifications ................................................................................ C–8

C.4.1 Digital Data Rate.................................................................................................................. C–8

C.4.2 Demodulation and FEC Decoding Types ............................................................................ C–8

C.4.3 Descrambling Types ............................................................................................................ C–8

C.4.4 Differential Decoder ............................................................................................................C–9

C.4.5 Demodulator Spectrum Rotation ......................................................................................... C–9

C.4.6 Receive Frequency (IF)........................................................................................................ C–9

C.4.7 Receive Input Power (Desired Carrier)................................................................................ C–9

C.4.8 Receive Input Power (Composite) ....................................................................................... C–9

C.4.9 IF Input Overload................................................................................................................. C–9

C.4.10 Demodulator IF Input Shape................................................................................................ C–9

C.4.11 Channel Spacing/Adjacent Carrier Performance ............................................................... C–10

C.4.12 Acquisition Time ............................................................................................................... C–10

C.4.13 Acquisition Probability ...................................................................................................... C–10

C.4.14 Receive IF Carrier Acquisition Range ............................................................................... C–10

C.4.15 Collision Recovery............................................................................................................. C–11

C.5 Burst Mode System - Specifications ....................................................................................... C–11

C.5.1 Loopback Modes................................................................................................................ C–11

C.5.2 Remote Control.................................................................................................................. C–12

C.5.3 Modem Remote Address.................................................................................................... C–12

C.5.4 Monitored Signals.............................................................................................................. C–12

C.5.5 Faults Monitored................................................................................................................ C–12

C.5.6 Stored Faults ...................................................................................................................... C–16

C.5.7 Stored Configurations ........................................................................................................ C–16

C.6 Burst Mode Specifications....................................................................................................... C–17

GLOSSARY G–1

INDEX i–1

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Figures

FIGURE 1-1. BLOCK DIAGRAM..........................................................................................................................1–2

FIGURE 1-2. DEMODULATOR BLOCK DIAGRAM ..........................................................................................1–9

FIGURE 1-3. M&C BLOCK DIAGRAM..............................................................................................................1–12

FIGURE 1-4. DIMENSIONAL ENVELOPE DRAWING ....................................................................................1–14

FIGURE 2-1. INSTALLATION OF THE OPTIONAL MOUNTING BRACKET KT/6228-1 ..............................2–3

FIGURE 2-2. REED-SOLOMON CODEC INSTALLATION................................................................................2–5

FIGURE 2-3. TURBO CODEC INSTALLATION..................................................................................................2–7

FOR RIBBON-CONFIGURED CONNECTOR FIGURE 2-4. DATA I/O CONNECTOR (J8)

REMOVAL/INSTALLATION.........................................................................................................................2–9

FIGURE 2-5. MAIN BOARD FIELD-CHANGEABLE CHIPS (SHOWN WITH OVERHEAD CARD

REMOVED) ...................................................................................................................................................2–10

FIGURE 3-1. REAR PANEL...................................................................................................................................3–1

FIGURE 4-1. FRONT PANEL VIEW .....................................................................................................................4–1

FIGURE 4-2. KEYPAD ...........................................................................................................................................4–3

FIGURE 4-3. MENU TREE.....................................................................................................................................4–6

FIGURE 4-4. RF LOOPBACK ..............................................................................................................................4–21

FIGURE 4-5. IF LOOPBACK ...............................................................................................................................4–22

FIGURE 4-6. BASEBAND LOOPBACK..............................................................................................................4–30

FIGURE 4-7. INTERFACE LOOPBACK .............................................................................................................4–31

FIGURE 6-1. EIA-422, EIA-232, OR V.35 MASTER/MASTER CLOCKING DIAGRAM..................................6–3

FIGURE 6-2. EIA-422, EIA-232, OR V.35 MASTER/SLAVE CLOCKING DIAGRAM.....................................6–4

FIGURE 6-3. CLOCK SLIP..................................................................................................................................6–5

FIGURE 6-4. DOPPLER SHIFT..............................................................................................................................6–6

FIGURE 7-1. VITERBI DECODER........................................................................................................................7–7

FIGURE 7-2. VITERBI DECODER AND REED-SOLOMON..............................................................................7–8

FIGURE 7-3. BPSK AND {O}QPSK BER PERFORMANCE...............................................................................7–9

FIGURE 7-4. TURBO PRODUCT CODEC..........................................................................................................7–10

FIGURE 7-5. SEQUENTIAL DECODER, REED-SOLOMON, AND 1544 KBPS .............................................7–11

FIGURE 7-6. SEQUENTIAL DECODER AND 56 KBPS ...................................................................................7–12

FIGURE 7-7. SEQUENTIAL DECODER AND 1544 KBPS................................................................................7–13

FIGURE 8-1. FAULT ISOLATION TEST SETUP.................................................................................................8–2

FIGURE 8-2. TYPICAL OUTPUT SPECTRUM ...................................................................................................8–5

FIGURE 8-3. TYPICAL EYE CONSTELLATIONS..............................................................................................8–6

FIGURE 10-1. AUPC BLOCK DIAGRAM ..........................................................................................................10–2

FIGURE 11-1. TRANSMIT SECTION OF THE ASYMMETRICAL LOOP TIMING BLOCK DIAGRAM.....11–2

FIGURE 11-2. RECEIVE SECTION OF THE ASYMMETRICAL LOOP TIMING BLOCK DIAGRAM ........11–3

FIGURE 14-1. SEQUENTIAL DECODER BLOCK DIAGRAM.........................................................................14–1

FIGURE 14-2. VITERBI DECODER BLOCK DIAGRAM..................................................................................14–3

FIGURE 15-1. REED-SOLOMON PCB (AS/5304-1)...........................................................................................15–1

FIGURE 15-2.REED-SOLOMON CODEC BLOCK DIAGRAM.........................................................................15–2

FIGURE 15-3. REED-SOLOMON ENCODER SECTION BLOCK DIAGRAM................................................15–3

FIGURE 15-4. REED-SOLOMON CODE PAGE FORMAT ................................................................................15–4

FIGURE 15-5. REED-SOLOMON DECODER SECTION BLOCK DIAGRAM................................................15–5

FIGURE A-1. CARRIER LEVEL VS SYMBOL RATE......................................................................................A–18

FIGURE C-1. SNM-1001L BURST MODE FAULT TREE ................................................................................ C–13

SNM-1001L Satellite Modem Revision 1 Preface MN/SNM1001L.IOM

Tables

TABLE 1-1. FAST OPTIONS AND REQUIRED CONFIGURATIONS...............................................................1–4

TABLE 3-1. MODEM REAR PANEL CONNECTORS.........................................................................................3–2

TABLE 3-2. REMOTE CONNECTOR AND PINOUTS (J6).................................................................................3–3

TABLE 3-3. FAULT CONNECTOR AND PINOUTS (J7) ....................................................................................3–4

TABLE 3-4. 25-PIN D CONNECTOR PINOUTS ..................................................................................................3–6

TABLE 3-5. 34-PIN WINCHESTER CONNECTOR PINOUTS (V.35) ................................................................3–7

TABLE 3-6. 37-PIN CONNECTOR PINOUTS (OPTIONAL)...............................................................................3–8

TABLE 3-7. AUX 1 CONNECTOR AND PINOUTS (J9).....................................................................................3–9

TABLE 3-8. ALARMS CONNECTOR AND PINOUTS (J10).............................................................................3–10

TABLE 4-1. LED INDICATORS ............................................................................................................................4–2

TABLE 4-2. CUSTOM MODEM DEFAULTS.....................................................................................................4–97

TABLE 5-1. MODEM TYPE SELECTION ............................................................................................................5–1

TABLE 5-2. COMTECH EFD CLOSED NETWORK PARAMETER SETTINGS...............................................5–3

TABLE 5-3. REED-SOLOMON MODES...............................................................................................................5–4

TABLE 7-1. AVAILABLE TPC MODES ...............................................................................................................7–2

TABLE 7-2. TURBO PRODUCT CODING PROCESSING DELAY COMPARISON ..........................................7–3

TABLE 8-1. CONVERSION TO S/N AND EB/N0 CHART..................................................................................8–4

TABLE 10-1. SETTING AUPC PARAMETERS..................................................................................................10–3

TABLE A-1. SYSTEM SPECIFICATION SUMMARY........................................................................................A–2

TABLE A-2. L-BAND MODULATOR..................................................................................................................A–3

TABLE A-3. DEMODULATOR SPECIFICATION..............................................................................................A–4

TABLE A-4. MODULATOR DIGITAL DATA RATES.......................................................................................A–5

TABLE A-5. MODULATION AND ENCODING TYPES....................................................................................A–6

TABLE A-6. SCRAMBLING TYPES....................................................................................................................A–7

TABLE A-7. DEMODULATOR DIGITAL DATA RATE.................................................................................. A–13

TABLE A-8. L-BAND DEMODULATION AND FEC DECODING TYPES ....................................................A–14

TABLE A-9. DESCRAMBLING TYPES.............................................................................................................A–15

TABLE A-10. AUPC PARAMETERS .................................................................................................................A–32

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SNM-1001L Satellite Modem Revision 1 Preface MN/SNM1001L.IOM

About this Manual

This manual provides installation and operation information for the Comtech EF Data SNM-1001A satellite modem. This is a technical document intended for earth station engineers, technicians, and operators responsible for the operation and maintenance of the SNM-1001A.

Related Documents

The following documents are referenced in this manual:

• INTELSAT Earth Station Standards 308, 309, and 310

Conventions and References

Cautions and Warnings

CAUTION

WARN ING

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.

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

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

Examples of Multi-Hazard Formats

xiii

SNM-1001L Satellite Modem Revision 1 Preface MN/SNM1001L.IOM

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.

Recommended Standard Designations

Recommended Standard (RS) Designations have been superseded by the new designation of the Electronic Industries Association (EIA). References to the old designations are shown only when depicting actual text displayed on the screen of the unit (RS-232, RS485, etc.). All other references in the manual will be shown with the EIA designations (EIA-232, EIA-485, etc.) only.

Trademarks

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.

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SNM-1001L Satellite Modem Revision 1 Preface MN/SNM1001L.IOM

ELECTRICAL SAFETY

The SNM-1001L Satellite Modem has been shown to comply with the following safety standard:

• EN 60950: Safety of Information Technology Equipment, including electrical business machines.

The equipment is rated for operation over the range 85 to 264 volts AC. It has a maximum power consumption of 60 watts.

FUSES

The SNM-1001L Satellite Modem is fitted with two fuses, one each for line and neutral connections. These are contained within the body of the IEC power connector, behind a small plastic flap.

• For 230 volt AC operation, use T0.75A, 20mm fuses.

• For 115 volt AC operation, use T1.25A fuses, 20mm fuses.

IMPORTANT

Environmental

The SNM-1001L shall not be operated in an environment where the unit is exposed to extremes of temperature outside the ambient range 0 to 50°C (32 to 122°F), precipitation, condensation, or humid atmospheres above 95% RH, altitudes (un-pressurised) greater than 2000 metres, excessive dust or vibration, flammable gases, corrosive or explosive atmospheres.

Operation in vehicles or other transportable installations that are equipped to provide a stable environment is permitted. If such vehicles do not provide a stable environment, safety of the equipment to EN60950 may not be guaranteed.

For continued operator safety, always replace the fuses with the correct type and rating.

SNM-1001L Satellite Modem Revision 1 Preface MN/SNM1001L.IOM

Installation

The installation and connection to the line supply must be made in compliance to local or national wiring codes and regulations.

The SNM-1001L is designed for connection to a power system that has separate ground, line and neutral conductors. The equipment is not designed for connection to power system that has no direct connection to ground.

The SNM-1001L is shipped with a line inlet cable suitable for use in the country of operation. If it is necessary to replace this cable, ensure the replacement has an equivalent specification. Examples of acceptable ratings for the cable include HAR, BASEC and HOXXX-X. Examples of acceptable connector ratings include VDE, NF-USE, UL, CSA, OVE, CEBEC, NEMKO, DEMKO, BS1636A, BSI, SETI, IMQ, KEMA-KEUR and SEV.

International Symbols:

Symbol Definition Symbol Definition

Alternating Current

Fuse

Telecommunications Terminal Equipment Directive

In accordance with the Telecommunications Terminal Equipment Directive 91/263/EEC, this equipment should not be directly connected to the Public Telecommunications Network.

Protective Earth

Chassis Ground

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SNM-1001L Satellite Modem Revision 1 Preface MN/SNM1001L.IOM

EMC (Electromagnetic Compatibility)

In accordance with European Directive 89/336/EEC, the SDM-300L3 Satellite Modem has been shown, by independent testing, to comply with the following standards:

Emissions: EN 55022 Class B - Limits and methods of measurement of radio

interference characteristics of Information Technology Equipment.

(Also tested to FCC Part 15 Class B)

Immunity: EN 50082 Part 1 - Generic immunity standard, Part 1: Domestic,

commercial and light industrial environment.

Additionally, the SDM-300L3 has been shown to comply with the following standards:

EN 61000-3-2 Harmonic Currents Emission

EN 61000-3-3 Voltage Fluctuations and Flicker

EN 61000-4-2 ESD Immunity

EN 61000-4-4 EFT Burst Immunity

EN 61000-4-5 Surge Immunity

EN 61000-4-6 RF Conducted Immunity

EN 61000-4-8 Power frequency Magnetic Field Immunity

EN 61000-4-9 Pulse Magnetic Field Immunity

EN 61000-4-11 Voltage Dips, Interruptions, and Variations Immunity

EN 61000-4-13 Immunity to Harmonics

In order that the Modem continues to comply with these standards, observe the following instructions:

IMPORTANT

• Connections to the transmit and receive IF ports (Type N and Type F, female, connectors) should be made using a good quality coaxial cable - for example RG58/U (50Ω or RG59/U (75Ω).

• All 'D' type connectors attached to the rear panel must have back-shells that provide continuous metallic shielding. Cable with a continuous outer shield (either foil or braid, or both) must be used, and the shield must be bonded to the back-shell.

• The equipment must be operated with its cover on at all times. If it becomes necessary to remove the cover, the user should ensure that the cover is correctly re-fitted before normal operation commences.

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SNM-1001L Satellite Modem Revision 1 Preface MN/SNM1001L.IOM

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

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

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Chapter 1. INTRODUCTION

SNM-1001L

Satellite

Modem

The SNM-1001L Satellite Modem is a dual function modem: it can operate in burst and continuous mode.

1.1 Overview

• Burst mode operation: 19.2 kbps and/or 57.6 kbps, 1/2 rate QPSK

• 2.4 kbps to 5.0 Mbps Continuous Mode

• Automatic Uplink Power Control (AUPC)

• Reed-Solomon

• Turbo Product Coding

• Built-In Test

• BPSK, QPSK, Offset QPSK, and 8-PSK

• BUC FSK Communications

• Fully Accessible System Topology (FAST)

1–1

SNM-1001L Satellite Modem Revision 1

AGCA

Introduction MN/SNM1001L.IOM

Refer to Figure 1-1 for a system block diagram.

User Data

UX 1

OC-TTL

Faults

Form C

Contacts

Remote

Port

C Or

Optional

DC Prime Power

J10

Power

Supply

UX 1

Fault Relays

larm Rela ys

Remo te Port

Data

Interface

UX 1

M&C

Opt ODU

C Only

Opt ODU

Supply

Tx Data

Tx Clock

ST Clock

Rx Data

Rx Clock

I/Q

Sat Clock

Control / Status

SNM-1001L Satellite Modem

Figure 1-1. Block Diagram

1.2 Options Summary

Encoder /

Modulator

Demodulator

/ Decoder

Ref Osc

Ext Ref

Tx IF

Note 1

Rx IF

Note 2

CP2

CP1

CP3

Notes:

1) Tx IF (L-Band only) Outputs a 10 MHz

2) Rx IF Outputs LNB V oltage and 10 MH z

Transmit

RF Equipment

LNB

Reference and Optional ODU Voltage.

Reference.

A summary of the available options for the unit is provided. Contact Comtech EF Data Customer Support for upgrade information.

Option Description /Comment Availability Install Option

Single Data/Code Rate Yes FAST

Low Rate Variable

Full Rate Variable

≤ 512 kbps

≤ 5.0 Mbps

Offset QPSK Yes FAST

8-PSK Requires Viterbi, Reed-Solomon Codec.

Overhead card required for Open Network.

TX/RX L-Band ± 0.02 ppm

L-Band Modem with high stability reference.

TX only, L-Band ± 0.02 ppm

Hardware limited with high stability reference.

RX only, L-Band ± 1.0 ppm

TX/RX L-Band ± 1.0 ppm

Hardware limited with 1 ppm reference Yes Factory

L-Band modem with 1 ppm reference Yes Factory

Sequential or Viterbi Codec Modem can be supplied with either:

Viterbi, Sequential TX Reed-Solomon Codec Concatenates with Viterbi Yes User

RX Reed-Solomon Codec Concatenates with Viterbi Yes User

1–2

Yes FAST

Yes User

Standard Factory

Yes Factory

Yes FAST

SNM-1001L Satellite Modem Revision 1 Introduction MN/SNM1001L.IOM

Option Description/Comment Availability Install Option

Turbo Codec Requires Reed-Solomon Codec

Asymmetrical Loop Timing (SCT) Yes FAST

AUPC (No ASYNC) Requires Reed-Solomon cards Yes User or FAST

37-Pin Female D Connector EIA-422/EIA-449 Interface and

25-Pin Female D Connector EIA-530 (RS-422), EIA-232 and V.35 Yes User

34-Pin Female V.35 “Winchester” Connector with V.35 Yes User

50-Pin Female D Connector for use

Overhead card.

Without

Primary Power: Auto-ranging AC 85 to 264 VAC

Primary Power: 48 VDC (Modem only, No BUC)

ODU DC Power: 24V or 48V. Primary input = AC Only

removal.

Mil-188-114

Includes EIA-422, EIA-232, and V.35

Use with redundancy switches

Yes Factory

100W @ 24V

150W @ 48V

Yes User

Yes Factory

1.3 Comtech EF Data Part Numbers

Part No. Description Remarks

PL/9066-3 RX only IF 1.0 ppm Use with internal reference LNBs.

PL/9066-2 TX only IF 0.02 ppm Hardware limited version PL/9066-1 TX/RX IF 0.02 ppm Full Duplex PL/9066-5 TX/RX IF 1.0 ppm Full Duplex (No BUCs) PL/5727-1 25-pin EIA-530 Interface PL/6031-1 37-pin EIA-449 Interface PL/6167-1 50-pin Interface No Overhead PL/6032-1 34-pin Interface V.35 PL/6284 TX Reed-Solomon PL/6285 RX Reed-Solomon PL/9394-1 TX/RX Turbo PS/AC65W01P01 90-264 VAC Modem PS Modem only PS/DC-DC5V65W -48 VDC Modem PS Modem only KT/9567-2 90 – 264 VAC, 100W

BUC P/S, 24V, CE Mark

KT/9567-3 90 – 264 VAC, 150 W

BUC P/S, 48 VDC

Hardware limited version.

24 VDC, 100W AC BUC Power Supply 48 VDC 150 W AC BUC Power Supply

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SNM-1001L Satellite Modem Revision 1 Introduction MN/SNM1001L.IOM

1.4 FAST Accessible Options

Comtech EF Data FAST system allows immediate implementation of different options through the user interface keypad. Some FAST options are available through the basic platform unit, while others require that the unit be equipped with optional hardware or that the hardware be installed in the field. Refer to Table 1-1 for a listing of possible configurations.

The options available through the FAST architecture include:

• Single Data Rate • BUC FSK: DiSEQ

• Low Variable Data Rate

(up to 512 kbps)

• High Variable Data Rate (up to 4.375 Mbps)

• Sequential Decoder

• Viterbi Decoder

• Asymmetrical Loop Timing

* Optional hardware required.

• OQPSK

• 8-PSK

• Offset QPSK

• Reed-Solomon COdec *

• AUPC

• Turbo Codec

Table 1-1. FAST Options and Required Configurations

Hardware

Basic Platform SNM-1001L

FAST Option X X X X X X X FAST Option with

Reed-Solomon Option with Turbo

Hardware

Single Data rate

Low Variable Data

Rate

High Variable Data

Rate

X X

(Note 1)

X X

Sequential Decoder

X (Note 1)

Viterbi Decoder

Asymmetrical Loop

Timing

BUC FSK: DiSEQ

Offset QPSK

8-PSK

Reed-Solomon

Codec (See Note 2)

AUPC

Turbo Codec (See

Note 2)

Notes:

1. The basic modem is shipped with either Sequential or Viterbi decoder.

2. Either Reed-Solomon or Turbo Codec is installed, not both.

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SNM-1001L Satellite Modem Revision 1 Introduction MN/SNM1001L.IOM

1.5 Compatibility

The SNM-1001L is functionally compatible with many Comtech EF Data modems. When properly configured, the unit will interoperate with the following Comtech EF Data modems:

• CDM-550/550T (Turbo only) • SDM-650B

• CDM-600 (Open Network and Turbo only) • SDM-6000

• SDM-100/100A • SDM-8000

• SDM-300/300A • SDM-150A

• SNM-1010

1.6 Description of the Modulator

1.6.1 Overview

The modulator provides PSK modulated carriers within the 950 to 1750 MHz range. The types of modulation that encode the transmitted baseband data from the interface PCB are:

• BPSK

• QPSK

• Offset QPSK

• 8-PSK

1.6.2 Functional Description

The modulator is composed of eight basic subsections. These subsections are divided into the baseband processing section and the RF section of the modulator. The modulator controls all programmable functions on this module. Fault information from the modulator is sent to the M&C. Refer to Chapter 9 for a list of reported faults. The major modulator subsections are:

• Scrambler/Differential Encoder

• Convolutional Encoder

• Programmable Vector Rotation

• I/Q Nyquist Filters

• Modulator

• RF Synthesizer

• Output Amplifier

• Output Level Control

1–5

SNM-1001L Satellite Modem Revision 1 Introduction MN/SNM1001L.IOM

If the modem is so equipped, the optional Reed-Solomon PCB first processes the data. The data is then sent to the scrambler for energy dispersal, and then to the differential encoder. The differential encoder is a 2-bit encoder, which allows for resolution of two of the four ambiguity states of the QPSK or OQPSK demodulator.

The data is sent to the convolutional encoder for encoding the baseband data. The code rates 1/2, 3/4, 7/8, and 2/3 are based on the symbol rate range of 2.4 kbps to 2.5 Mbps. For Viterbi codes, the convolutional encoder encodes the data at 1/2 rate. If the selected code rate is 3/4, then 2 of every 6 symbols are punctured. For 3 bits in, there are 4 symbols out.

• For Sequential codes, the convolutional encoder generates the parity bits from the input data stream, which allows for error correction at the far end of the link. The rate of the encoder may be 1/2, 3/4, and 7/8.

For example, the 7/8 rate puts out 8 symbols for every 7 bits in. In {O}QPSK mode, the data is split into two separate data streams to drive the I and Q channels of the modulator.

The baseband processing for the SNM-1001L does not use the digital modulation. Instead, the baseband Nyquist filtered I and Q signals pass through D/A converters to drive an analog vector modulator.

The local oscillator input to the vector modulator is a single loop synthesizer incorporating a Direct Digital Synthesis (DDS) chip to accommodate 100 Hz steps over the range of 950 to 1750 MHz. The modulator output then passes through amplifiers and AGC incorporating programmable output level control and switched low pass filters for harmonic attenuation.

1.6.3 Description of Modulation Types

The modulation types for the modem include BPSK, QPSK, Offset QPSK, or 8-PSK.

The PSK data transmission encoding method uses the phase modulation technique. This method varies the phase angle of the carrier wave to represent a different bit value for the receiver. The higher levels of modulation are required for an operating range that has a limited bandwidth.

The order of modulation is represented by mPSK, where “m” relates to the number of discrete phase angles. Refer to the following list for a brief description of the modulation types.

• BPSK: 2 discrete phase angles represent the 2 possible states of a symbol.

• Offset QPSK: 4 discrete phase angles represent the 4 possible states of a symbol.

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SNM-1001L Satellite Modem Revision 1 Introduction MN/SNM1001L.IOM

• 8-PSK: 8 discrete phase angles represent the 8 possible states of a symbol.

Note: The code rate determines the number of symbols per bit.

1.6.3.1 BPSK Encoding

The modulator converts transmitted baseband data into a modulated BPSK carrier at

2.4 kbps to 1.25 Mbps (1/2 rate). Using vector analysis of the constellation pattern, BPSK represents one symbol with the carrier phase either at 0° or 180°. The 1/2 rate encoding at the convolutional encoder provides two symbols output for every bit input. Uncoded (1/1 rate) BPSK operation also is allowed from 4.8 kbps to 2.5 Mbps.

Code Rate Symbols/Bit Bits/Hz

1/2 2 0.5 1/1 1 1

1.6.3.2 QPSK Encoding

The modulator converts transmitted baseband data into a modulated QPSK carrier at the following parameters:

• 4.6 kbps to 5.0 Mbps (1/1 rate, uncoded)

• 4.8 kbps to 2.5 Mbps (1/2 rate)

• 7.2 kbps to 3.75 Mbps (3/4 rate)

• 8.4 kbps to 4.375 Mbps (7/8 rate)

Using vector analysis of the constellation pattern, QPSK represents a symbol with the carrier phase angle at 45°, 135°, 225°, or 315°. The 1/1, 1/2, 3/4, and 7/8 rates encoded at the convolutional encoder provide the desired input/output bit rates.

Code Rate Symbols/Bit Bits/Hz

1/1 1 2 1/2 2 1 3/4 1.33 1.5 7/8 1.143 1.75

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SNM-1001L Satellite Modem Revision 1 Introduction MN/SNM1001L.IOM

1.6.3.3 Offset QPSK Encoding

The modulator PCB converts the transmitted baseband data into a modulated Offset QPSK carrier within the same parameters as QPSK.

The Offset QPSK modulation is mainly different from QPSK by offsetting the I and Q channel modulation signals. This offset prevents the RF envelope from going through zero. Under certain conditions, this may allow less back-off in the High Power Amplifier (HPA) system. The 1/1, 1/2, 3/4, and 7/8 rates encoded at the convolutional encoder provide the desired input/output bit rates.

Code Rate Symbols/Bit Bits/Hz

1/1 1 2 1/2 2 1 3/4 1.333 1.5 7/8 1.143 1.75

1.6.3.4 8-PSK Encoding

The modulator converts transmitted baseband data into modulated 8-PSK carrier at the following parameters:

• 64 kbps to 5.000 Mbps (2/3 rate)

Using vector analysis of the constellation pattern, 8PSK represents a symbol with carrier phase angles at 22.5°, 67.5°, 112.5°, 157.5°, 202.5°, 247.5°, 292.5°, and 337.5°. The 2/3 rate encoding provides the desired input/output bit rates.

Code Rate Symbol/Bit Bit/s Hz

2/3 1.5 2

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SNM-1001L Satellite Modem Revision 1

Introduction MN/SNM1001L.IOM

1.7 Description of the Demodulator

A block diagram of the demodulator is shown in Figure 1-2.

1.7.1 Overview

The demodulator converts PSK modulated carriers within the 950 to 1750 MHz range to a demodulated baseband data stream. The converted modulation types are BPSK, QPSK, Offset QPSK, and 8-PSK. The demodulator then performs FEC decoding on the data stream to produce the error corrected data output to the data interface.

L O O P B

A C K

L-BAND INPUT

S W I T C H

B P F

G C

L PF BPF

L-BAND INPUT

O C

S T

E X T

R E F E R E N C E

R E F

V C X O

O P T

H I G H

A B I L I T Y

T O

CONV E R T E R

DIG I T SIG N

PROC E S S I N G

DIG I T CL O C K

RECO V E R Y -

LO O P

DOPPLER

PLESIOC HRO N O U S

BUFFER

R E F

P L L

L O #1

REFEREN CE

EQUENTIAL DECODER

LO #2

VITERBI

DECODER

OPTIONAL

TURBO CODEC

OPTION

REED-SOLOMON

CODEC

MUX

A L

RFACE

N T E

Figure 1-2. Demodulator Block Diagram

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SNM-1001L Satellite Modem Revision 1 Introduction MN/SNM1001L.IOM

1.7.2 Functional Description

The demodulator functions as an advanced, digital, coherent-phase-lock receiver and decoder. Demodulator faults also are reported to the front panel. The demodulator consists of the following basic subsections.

• Digital Costas Loop

• RF Section

• Automatic Gain Control

• Analog-to-Digital (A/D) Converter

• Soft Decision Mapping

• Programmable Vector Rotation

• Digital Nyquist Filters

• FEC Decoder

• Digital Clock Recovery Loop

• Decoder

The modulated IF signal at 950 to 1750 MHz enters the RF module for conversion to an IF frequency. The IF is then sampled by an A to D converter and digitally demodulated. The I and Q data is then sent to the digital Nyquist filters, resulting in a filtered, digital representation of the received signal. The digital data is then sent to four separate circuits:

• Automatic Gain Control

• Carrier Recovery (Costas) Loop

• Clock Recovery Loop

• Soft Decision Mapping

The AGC provides a gain feedback signal to the RF section. This closed loop control ensures that the digital representation of the I and Q channels is optimized for the Costas and Clock loops, as well as the soft-decision mapping circuitry.

When the active decoder determines that the modem is locked, the M&C stops the sweep and begins the de-stress process. This involves fine tuning the DDS based on the phase error in the Costas loop. The de-stress process continues as long as the modem is locked. If the carrier is interrupted, the M&C resumes the sweep process.

The digital Costas loop, in conjunction with a Direct Digital Synthesizer (DDS), performs the carrier recovery function. The Costas loop consists of a Costas phase detector, loop filter, and DDS, all implemented digitally. The DDS performs the function of a Voltage-Controlled Oscillator (VCO) in an analog implementation, but can be easily programmed to the desired center frequency via the M&C. The output of the DDS is sent to the RF module and provides the reference to which the local oscillator is locked. The M&C sweeps the local oscillator (via DDS programming) through the user-specified sweep range.

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SNM-1001L Satellite Modem Revision 1 Introduction MN/SNM1001L.IOM

The digital clock loop, in conjunction with another DDS, performs the clock recovery function. The clock loop consists of a phase detector, loop filter, and DDS, all implemented digitally. The DDS performs the function of a VCO in an analog implementation. The recovered data and symbol clocks are then used throughout the demodulator.

The soft decision mapper converts the digital I and Q data to 3-bit soft decision values. These values are then fed to the programmable vector rotation circuit, providing compatibility with spectrum reversal of the I and Q channels.

The output of the vector rotation circuit is then sent to the Viterbi decoder and optional Sequential decoder. The output is then sent to the optional Reed-Solomon or Overhead PCB. With the Turbo coding hardware option, the vector rotation circuit output is sent to the optional Turbo Codec for decoding.

1.8 Description of Monitor & Control

1.8.1 Overview

The Monitor & Control (M&C) monitors the modem and provides configuration updates to other modems within the modem when necessary. The modem configuration parameters are maintained in battery-backed RAM, which provides total recovery after power-down situation. The M&C functions include extensive fault and status reporting.

All modem functions are accessible through a local front panel interface and a remote communications interface.

A block diagram of the M&C is shown in Figure 1-3.

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SNM-1001L Satellite Modem Revision 1 Introduction MN/SNM1001L.IOM

1.8.2 Functional Description

The M&C card is composed of the following subsections:

• Microcontroller with Universal Asynchronous Receiver/Transmitter (UART)

• Digital-to-Analog Converter (DAC)

• Read Only Memory (ROM)

• Analog-to-Digital Converter (ADC)

• Read Access Memory (RAM)

• User Interface

• Fault and Alarm Relay

FAULT

MODEM

AND ALARM

RELAYS

11 M H z CLOCK

DAC

ADC

MICRO-

IC BUS

CONTROLLER

EIA-232

EIA-485

Figure 1-3. M&C Block Diagram

ROM (M&C, BULK,

BOOT)

RAM AND

REAL

TIME

CLOCK

9-PIN

REMOTE

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SNM-1001L Satellite Modem Revision 1 Introduction MN/SNM1001L.IOM

The heart of the M&C card is the Dallas 80C310 microcontroller operating at 11 MHz. This microcontroller contains 256 Kbytes of internal RAM. The ROM at U8 is 29F040 (512 kbytes).

ROM access times must be equal to or greater than 150 ns. The RAM size can be 8 or 32 Kbytes. This RAM chip is internally battery-backed and contains a real time clock used by the M&C.

The non-volatile RAM on the M&C module allows the module to retain configuration information without prime power for 1 year (approximately). If the modem is powered down, the following sequence is carried out by the M&C microcontroller.

1. When power is applied to the M&C, the microcontroller checks the non-volatile memory to see if valid data has been retained. If valid data has been retained, the modem is reconfigured to the parameters maintained by the RAM.

2. If the non-volatile memory fails the valid data test, a default configuration from ROM is loaded into the system.

The UART supports serial ASYNC communications channels (remote port) with a maximum data rate of 19200 bit/s. The UART is a built-in peripheral of the microcontroller. The communications type can be EIA-232, EIA-485 (2-wire), EIA-485 (4-wire), and software selectable.

The DAC supplies a voltage that controls the contrast of the display. The ADC monitors all the voltages from the power supply. The DAC and ADC are mapped to the microcontroller with an Integrated Circuit (IC) bus.

The user interface includes the following parts:

• Front panel

• Status LEDs

• Keyboard

• Sounder (beeper)

All functions are memory-mapped to the microcontroller.

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Introduction MN/SNM1001L.IOM

1.9 Dimensional Envelope

Refer to Figure 1-2 for the unit’s dimensional envelope drawing.

Note: Dimensions are listed in inches and centimeters are in parentheses.

19.0

48.26

1.75

4.4

19.1

48.72

17.0

(43.18)

1.25

3.2

Figure 1-4. Dimensional Envelope Drawing

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SNM-1001L Satellite Modem Revision 1 Introduction MN/SNM1001L.IOM

1.10 New in this Release

Revision 1 of this document incorporates the foillowing changes:

• Added 57.6 kbps throughtout the manual.

• Changed SNM-1001L3 to SNM-1001L from the Opening Screen

• Added Continuous Mode Data Rates and Burst Mode Data Rate in Chapter 3.

• Added Burst Mode Data Rate to B.3.1 Modulator Comnfiguration Commands

• Added Burst Mode Data Rate to B.3.2 Demodulator Comnfiguration Commands.

• Changed second paragraph of C.1.1 to read: 96 clock cycles at 19.2 kbps or 288

clock cycles at 57.6 kbps.

• Added 57.6 kbps to paragraph C.2.1

• C.2.17 changed to read: 96 clock cycles at 19.2 kbps or 288 clock cycles at 57.6

kbps.

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SNM-1001L Satellite Modem Revision 1 Introduction MN/SNM1001L.IOM

This page is intentionally left blank.

1–16

Chapter 2. INSTALLATION/

UPGRADES

The equipment contains parts and assemblies sensitive to damage by Electrostatic Discharge (ESD). Use ESD precautionary procedures when

CAUTION

touching, removing, or inserting PCBs.

2.1 Unpacking

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

Do not use any cutting tool that will extend more than 1 inch into the container. This can cause damage to the modem.

CAUTION

Unpack the modem as follows:

1. Cut the tape at the top of the carton indicated by OPEN THIS END.

2. Remove the cardboard/foam space covering the modem.

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

4. Save the packing material for storage or reshipment purposes.

5. Inspect the equipment for any possible damage incurred during shipment.

6. Check the equipment against the packing list to ensure the shipment is correct.

7. Refer to Section 2.2 for installation instructions.

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SNM-1001L Satellite Modem Revision 1 Installation MN/SNM1001L.OM

2.2 Installation

The modem arrives fully assembled from the factory. After unpacking the modem, install the modem as follows:

2.2.1 Modem Installation (Optional)

Refer to Figure 2-1. Use the following mounting kit, KT/6228-1.

Optional: Mounting KIT, KT/6228-1 (Modem to Equipment Rack)

QTY Part Number Description

2 FP/6138-1 Bracket, Rear Support 4 HW/10-32x1/2RK Bolt, #10 Rack 2 HW/10-32X1/4 SHC Screw, Socket 10-32 x 1/4inch

Tools Required:

Screw Driver Phillips 5/32-inch SAE Allen Wrench

1. Install the IDU rear support brackets as follows:

a. Install provided rear support bracket onto the mounting rail of the rack. Fasten

with provided bracket bolts.

b. Fasten the provided #10 socket head screws to the rear-side mounting holes on

either side of the chassis modem. Mount the modem into the equipment rack ensuring that the socket heads engage into the slots of the rear support brackets.

Note: It may be necessary to adjust the location of the rear mounting rails of the rack.

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Equipment

Rack

Mounting

Rail

BRACKET

BOLTS

#10 Socket head

* Note: Components of mounting kit KT/6228-1

screw

Support

Bracket

Figure 2-1. Installation of the Optional Mounting Bracket KT/6228-1

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SNM-1001L Satellite Modem Revision 1 Installation MN/SNM1001L.OM

2.3 Software and Hardware Installation/Upgrades

2.3.1 Reed-Solomon PCB

The TX/RX Reed-Solomon PCBs are installed in the same slots as the Turbo module.

Do not mix Reed-Solomon PCBs with Turbo PCB. Damage to the equipment may be the result.

CAUTION

2.3.1.1 Unpacking

This equipment contains parts and assemblies sensitive to damage by ESD. Use ESD precautionary procedures when touching, removing, or inserting

CAUTION

PCBs.

1. Remove the Reed-Solomon PCB and mounting hardware from the cardboard caddypack and anti-static material.

2. Check the packing list to ensure the shipment is complete.

3. Inspect the Reed-Solomon PCB for any shipping damage.

2.3.1.2 Installation

The following tool is required to install the overhead interface PCB:

Description Application

Phillips  Screwdriver

Use the following information to install the Reed-Solomon Codec PCB as a daughter

card on the main PCB.

Refer Figure 2-3 for installation location of the Reed-Solomon daughter card.

Turn the power off before installation. High current VDC is present. Failure to do so could result in damage to modem components.

CAUTION

1. Turn off the modem and unplug the power supply.

2. Remove the rear panel retaining screws. Using the finger pulls, slide the main modem assembly out from the rear of the modem chassis.

3. Install the Reed-Solomon PCB to the main PCB by mating the male SIMM connectors with the female SIMM connectors in the position shown in Figure 2-2.

To remove and replace cross-point screws.

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SNM-1001L Satellite Modem Revision 1 Installation MN/SNM1001L.OM

4. After completing the above installation procedure turn on the modem. If the Reed-Solomon PCB was installed properly, the Utility Interface/Interface Module menu will display “OPT:Reed-Solomon.”

Reed-Solomon

Cards (TX or RX in

Either Slot)

Figure 2-2. Reed-Solomon Codec Installation

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SNM-1001L Satellite Modem Revision 1 Installation MN/SNM1001L.OM

2.3.2 Turbo Codec Installation

The Turbo Card is installed in the same slots as the Reed-Solomon PCBs. While the ReedSolomon uses two cards (TX and RX), the Turbo Codec uses only a single card.

DO not mix Reed-Solomon PCBs with Turbo PCs. Damage to the equipment may be the result.

CAUTION

2.3.2.1 Unpacking

This equipment contains parts and assemblies sensitive to damage by ESD. Use ESD precautionary procedures when touching, removing, or inserting

CAUTION

PCBs.

1. Remove the Turbo Codec PCB and mounting hardware from the cardboard caddypack and anti-static material. Check the packing list to ensure the shipment is complete.

2. Inspect the Turbo PCBs for any shipping damage.

2.3.2.2 Installation

The following tool is required to install the overhead interface PCB:

Description Application

Phillips  Screwdriver

Use the following information to install the Turbo Codec PCB as a daughter card on the main PCB.

Refer Figure 2-3 for installation location of the Turbo Codec PCB.

Turn the power off before installation. High current VDC is present. Failure to do so could result in damage to modem components.

CAUTION

1. Turn off the modem and unplug the power supply.Remove the rear panel retaining screws. Using the finger pulls, slide the main modem assembly out from the rear of the modem chassis.

2. If required: Reed-Solomon Removal – Remove the Reed-Solomon boards from the SIMM sockets by pushing the spring clips outward while rocking the board vertically, then lift the board out.

3. Turbo Codec Installation - Align the Turbo board with either of the SIMM sockets while holding it vertically with components toward Rear panel. Seat the connector into the socket and tilt the board toward the Front Panel until the spring clips lock the board into place.

4. Replace the top cover and reinstall the two side screws.

To remove and replace cross-point screws.

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SNM-1001L Satellite Modem Revision 1 Installation MN/SNM1001L.OM

5. Turn on the AC power. Modem will reinitialize.

Notes:

1. In this configuration, the Modem allows only Data Rates and Formats valid for Turbo.

2. Open-network modem types cannot be selected.

Turbo Codec Installed

Figure 2-3. Turbo Codec Installation

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SNM-1001L Satellite Modem Revision 1 Installation MN/SNM1001L.OM

2.4 Data I/O Interface Connector (J8) Removal/Installation

Note: The following procedures outline the removal and installation of the Data I/O connector (J8). These procedures are written with the assumption that the same configured connector will be reinstalled. However, the operator does have an option to install a different configured connector. Refer to Table 2-1 for a matrix explaining connector options.

Table 2-1. Connector (J8) Matrix

Modem Configuration EIA-422/EIA449 V.35

25-pin Connector X X 34-pin Connector X 37-pin Connector X

To remove Data I/O Connector (J8), as follows:

1. (For Ribbon-Configured Connector PL/6031.) Remove Data I/O connector (J8) (Figure 2-4) as follows:

a. Remove four screws securing the rear panel to the chassis.

b. Pull out rear panel to gain access to disconnect connector (J8).

c. Disconnect connector (J8) from the PCB.

d. Remove the four screws securing connector (J8) to the rear panel.

e. Remove the connector (J8).

To install Data I/O Connector (J8), as follows:

1. (For Ribbon-Configured Connector PL/6031.) Install Data I/O connector (J8) (Figure 2-

4) as follows:

a. Position connector (J8) in rear panel.

Use care when connecting the data I/O connector (J8) to the PCB. Damage to the connector pins may render the data I/O connector

CAUTION

b. Connect connector (J8) to the PCB.

c. Secure connector (J8) to the rear panel with four screws.

d. Position the rear panel to mate with the chassis and secure with four screws.

(J8) unserviceable. Misalignment can be the result.

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SNM-1001L Satellite Modem Revision 1 Installation MN/SNM1001L.OM

For Ribbon-Configured Connector

Figure 2-4. Data I/O Connector (J8) Removal/Installation

2.5 Hardware Upgrades

2.5.1 Main PCB Firmware Chips

The main PCB has one field-changeable flash memory chip for the M&C firmware. If necessary, this chip can be removed and a new chip added to allow for additional options, enhancements, or repairs. See Figure 2-5 for the locations of the field-changeable chips.

The bulk firmware for the FPGA downloads is stored in a non-replaceable flash memory device. Bulk firmware can be upgraded by reflashing the device through the remote control port as described in paragraph 2.6. The M&C firmware also can be upgraded by reflashing through the host port.

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SNM-1001L Satellite Modem Revision 1 Installation MN/SNM1001L.OM

U68

Figure 2-5. Main Board Field-Changeable Chips (Shown with Overhead Card Removed)

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SNM-1001L Satellite Modem Revision 1 Installation MN/SNM1001L.OM

2.6 Flash Upgrading

The SNM-1001L eliminates the need for physically replacing EPROMs to update firmware. Instead, the SNM-1001L modem uses ‘flash memory’ technology internally, and new firmware can be uploaded to the unit from an external PC.

Performing a flash upgrade erases the non-volatile RAM, which is where the modem's configuration is stored. Users shall re-enter the

IMPORTANT

The SNM-1001L provides for flash upgrading the M&C firmware or the BULK firmware.

Note: While the M&C and BULK firmware downloads are independent processes, the modem may have to be upgraded to the latest releases of both the M&C and BULK for proper function.

Flash updating firmware is a simple process, and users can obtain updates by any of the following means:

The upgrade is performed without opening the unit, by connecting the modem to the serial port of a computer and executing a flash uploader utility program.

The cable to connect the PC to the modem is the same as is used for normal EIA-232 remote control, and comprises three wires connected between two 9-pin ‘D’ type female connectors. Ensure this cable is connected and working properly before proceeding with a flash update.

WARN ING

desired configuration parameters.

• Download from the Comtech EF Data website: (http://www.comtechefdata.com

• Request as E-mail attachments

• Request shipment on diskettes or cd-rom.

The Remote Control port EIA-232 lines used for Flash upgrading also are connected to the Primary 25-pin data connector (P3B), and are used when 1:N Redundancy Switch is connected. Ensure that NOTHING is connected to P3B pins 4, 21 and 22 – if these pins are used, the EIA-232 remote control port will not function, and Flash upgrading is impossible.

)

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SNM-1001L Satellite Modem Revision 1 Installation MN/SNM1001L.OM

2.6.1 Downloading Flash Updates from the Web

The latest firmware releases and a free software utility are available on the Comtech EF Data web site (http://www.comtechefdata.com or Windows NT/2000/XP and provides all of the support required to perform a Comtech EF Data firmware reflash. If web downloading is not available or practical, contact the Customer Support department to obtain the firmware via an alternate method.

The downloadable firmware files are provided in both .zip or self extracting .exe formats. If your firewall does not permit downloading an .exe file, try the .zip file instead. The downloadable file contents are identical, usually comprising an uploader program, a help file, and a flashable data file.

). This utility is designed to run under Windows 95/98

2.6.1.1 How to Download Flash Upgrade Files

1 Create a new folder on the PC. This folder will be the destination folder for any flash

upgrade files downloaded.

On the Comtech EF Data web site (http://www.comtechefdata.com/ link.

Click the “flash upgrades” link for detailed downloading instructions.

Click the “flash firmware data files” link (located at the bottom of the instruction page). The flash firmware data files are organized by product.

Click the "SNM-1001L3" link. 6 Identify and download the latest M&C firmware file to the destination folder on the PC. 7 Repeat Step 6 for the BULK firmware file.

), click the “downloads”

2.6.1.2 How to Perform a Flash Upgrade

Full on-line help is provided with the uploader program. If you experience a problem, or have a question, contact Comtech EF Data Customer Support for assistance.

1 On the PC, double-click the .exe or .zip flash upgrade file to uncompress its contents. 2 Identify and execute the uploader program. 3 Follow the instructions presented on the screen to select a firmware file and initiate the

upload.

Following a successful upload process, the modem will automatically restart, running the new version of firmware.

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Chapter 3. CONNECTOR PINOUTS

3.1 Connector Overview

The rear panel connectors provide all necessary external connections between the modem and other equipment. Table 3-1 lists these connectors and Figure 3-1 show their locations.

J10 CP2

CP3

CP1

Figure 3-1. Rear Panel

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Table 3-1. Modem Rear Panel Connectors

Name

TX/IF OUTPUT CP1 Type N , Female RF Output EXT REF CP2 BNC, Female EXT REF IN RF IF INPUT CP3 Type F, Female REMOTE J6 9-pin D, Female Remote Interface FAULT J7 9-pin D, Female FORM C Fault Relay Contacts DATA I/O (Customer-select)

AUX 1 J9 9-pin D, Female (TTL) Faults

ALARMS J10 9-pin D, Female FORM C Alarm

AC INPUT NONE IEC GROUND NONE 10-32 Stud

Desig.

Ref.

Connector Type

25-pin D, Female 34-pin, Female 37-pin D, Female 50-pin D, Female

Function

RF Input 75Ω

Data Input/Output (standard modem) V.35 EIA-449 Data Input/Output

Satellite Clock Demod I/Q Automatic Gain Control (AGC) Out

Relay Contacts

Note: The European EMC Directive (EN55022, EN50082-1) requires using properly shielded cables for DATA I/O. These cables must be double-shielded from end-to-end, ensuring a continuous ground shield.

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SNM-1001L Satellite Modem Revision 1 Connector Pinouts MN/SNM1001L.IOM

3.2 Connector Description

3.2.1 Remote Connector and Pinouts (J6)

The remote connector is a 9-pin subminiature female D connector (J6) located on the rear panel of the modem. Screw locks are provided for mechanical security of the mating connector.

The remote connector interfaces the M&C functions to a remote location. The remote location can be an M&C computer located away from the modem, but attached via cable to the remote connector. This DCE interface is user selectable for either EIA-232 or EIA-484.

Refer to Table 3-2 for pinout information.

Table 3-2. Remote Connector and Pinouts (J6

EIA-232 EIA-485

Pin #

1 1 GND 2 RD (RX) 2 3 TD (TX) 3 4 4* +RX/TX +TX 5 GND 5* -RX/TX -TX 6 DSR 6 7 RTS 7 8 CTS 8* +RX/TX +RX 9 9* -RX/TX -RX

*For 2-Wire Operation:

• Only two wires are required.

• Tie pins 4 and 8 together (both +).

• Tie pins 5 and 9 together (both -).

Name

Pinout

Pin #

)

Name

(2-Wire)

Name

(4-Wire)

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SNM-1001L Satellite Modem Revision 1 Connector Pinouts MN/SNM1001L.IOM

3.2.2 Fault Connector and Pinouts (J7)

The fault connector provides Form C contact closures for fault reporting. The three Form C summary fault contacts, ratings 1A maximum at 24 VDC, 0.5A at 120 VAC, are Modulator, Demodulator, and Common Equipment.

The fault interface connection is a 9-pin subminiature female D connector (J7) located on the rear panel of the modem. Screw locks are provided for mechanical security on the mating connector. Refer to Table 3-3 for pinout information.

Table 3-3. Fault Connector and Pinouts (J7)

Pin # Signal Function Name

1 Common equipment is not faulted NO 2 COM 3 Common equipment is faulted NC 4 Modulator is not faulted NO 5 COM 6 Modulator is faulted NC 7 Demodulator is not faulted NO 8 COM 9 Demodulator is faulted NC

Note: A connection between the common (COM) and normally open (NO) contacts indicates no fault.

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SNM-1001L Satellite Modem Revision 1 Connector Pinouts MN/SNM1001L.IOM

3.2.3 Data I/O Interface Connector (J8)

The Data I/O interface connector conducts data input and output signals to and from the modem, and connects to the customer’s terrestrial equipment, breakout panel, or protection switch. The modem is currently available with a choice of four Data I/O connectors, as follows:

• 25-pin D connector is the standard connector shipped with a base platform modem.

• 37-pin D is an alternate connector available upon special request for the base platform modem.

• 34-pin Winchester is an alternate connector available upon special request for the base platform modem.

• Eurocom Interface – (Future)

The Data I/O pinout is different for each of the interface configurations. For pinout information, refer to the appropriate table as follows:

Standard: 25-pin D connector Optional: 34-pin Winchester connector Optional: 37-pin D connector Optional: 50-pin D connector

Table 3-4 Table 3-5 Table 3-6 Table 3-7

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SNM-1001L Satellite Modem Revision 1 Connector Pinouts MN/SNM1001L.IOM

Table 3-4. 25-Pin D Connector Pinouts

25-Pin D Connector

Pin # EIA-422 EIA-232 V.35

1 SHLD SHLD SHLD 2 SD-A TXD SD-A 3 RD-A RXD RD-A 4 RS-A RTS RTS 5 CS-A CTS CTS 6 DM-A DSR DSR 7 SIGGND SIGGND SIGGND 8 RR-A DCD RLSD 9 RT+B SCR+B 10 RR-B 11 TT+B SCTE+B 12 ST+B SCT+B 13 CS+B 14 SD+B SD+B 15 ST-A ST SCT-A 16 RD+B RD+B 17 RT-A RXC SCR-A 18 LL LL LL 19 RS+B 20* MC-A MC MC-A 21 DF DF DF 22 DM+B 23* MC+B MC-B 24 TT-A TXC SCTE-A 25 MF MF MF

*Note: Use the MASTER clock for EXTERNAL clock input. This clock input should equal the data rate unless the Asymmetrical Loop Timing Option (ASLT) is available. The ASLT option allows selection of different clock rates that vary from the digital data rate. Refer to the Utility/Modem Type/Modem Options menu for the ASLT option information.

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Table 3-5. 34-Pin Winchester Connector Pinouts (V.35)

Pin # Name

A SIGGND B SHLD C Request to Send (RTS) D Clear to Send (CTS) E Data Set Ready (DSR) F Receive Line Signal Detect (RLSD) P Send Data A (SD-A) R Receive Data A (RD-A) S Send Data B (SD+B) T Receive Data B (RD+B) U Serial Clock Transmit External A (SCTE-A) V Serial Clock Receive A (SCR-A) W Serial Clock Transmit External B (SCTE+B) X Serial Clock Receive B (SCR+B) Y Serial Clock Transmit A (SCT-A) c (CC) MC-A d (DD) MC-B m (MM) Modulator Fault (MF) n (NN) Demodulator Fault (DF) a(AA) Serial Clock Transmit B (SCT+B)

Note: Pins H, J, K, L, M, N, Z, a (AA), b (BB), e (EE), f (FF), h (HH), j (JJ), k (KK), l (LL) have no connection.

The modem is available with a Winchester V.35 as the data I/O connector (PL/6032). There is a jumper on the unit that either opens or closes the CC line. The interface is shipped with jumpers in positions 2 and 3, because:

1. Comtech EF Data has determined that several locations use Fireberd test equipment and a conflict will occur if CC is connected between the modem and the Fireberd.

2. Placing the jumper in positions 2 and 3 opens up the CC line, because the TTC/Fireberd test equipment interfaces use the line for DTE/DCE control.

3. Grounding pin CC at the Fireberd interface will change the Fireberd  to a DCE device.

4. Comtech EF Data uses the CC and DD for the input master clock (same as the external clock input to the modem). To input an external clock, change the jumper to positions 1 and 2 (the pin closest to the Winchester connector).

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Table 3-6. 37-Pin Connector Pinouts (Optional)

Pin # EIA-422/MIL-188-144

1, 19 Shield 3 MF 4 SD-A 5 ST-A 6 RD-A 7 RS-A 8 RT-A 9 CS-A 11 DM-A 13 RR-A 16 MC-A 17 TT-A 20, 37 SIGGND 21 DF 22 SD+B 23 ST+B 24 RD+B 25 RS+B 26 RT+B 27 CS+B 29 DM+B 31 RR+B 34 MC+B 35 TT+B

There are jumpers on the PL/6031 EIA-422 interface. Place the jumpers on the center pin and the pin towards the Master Clock (MC) to allow an external clock input on pins 16 and 34.

If desired, place the jumpers on the TR side to allow an external clock input on pins 12 and 30. Place the jumpers on the TR side for Demand Assigned Multiple Access (DAMA) applications.

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3.2.4 Auxiliary 1 Connector and Pinouts (J9)

The auxiliary 1 (AUX 1) connector provides:

• MOD and DEMOD (TTL) faults

• Satellite clock

• Satellite I&Q

• Automatic Gain Control (AGC) output voltage

The faults are open collector levels that indicate a modulator or demodulator failure. A logic “1” indicates the faulted condition.

AGC_OUT is a programmable voltage, 0 to 10V, for a receive signal level between

-25 and -60 dBm.

AUX 1 connection is a 9-pin female D connector (J9) located on the rear panel of the modem. Screw locks are provided for mechanical security on the mating connector. Refer to Table 3-7 for pinout information.

Table 3-7. AUX 1 Connector and Pinouts (J9)

Pin # Signal Function Name

1 Satellite Clock - SAT_CLK2 External TX Enabled EXT_TX_EN 3 Satellite Clock + SAT_CLK+ 4 MODULATOR TTL Fault MDFLTTTL 5 Ground GRN 6 RX_Q RX Q Channel Eye 7 DEMODULATOR TTL Fault DMDFLTTL 8 RX 1 Channel Eye RX_1 9 AGC Output AGC

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3.2.5 Alarms Connector and Pinouts (J10)

The alarm connector provides Form C contact closures for alarm reporting. The two Form C summary fault contacts are Modulator and Demodulator.

The alarm connection is a 9-pin female D connector (J10) located on the rear panel of the modem. Screw locks are provided for mechanical security on the mating connector. Refer to Table 3-8 for pinout information.

Table 3-8. Alarms Connector and Pinouts (J10)

Pin # Signal Function Name

1 Alarm 1 is faulted NO 2 COM 3 Alarm 1 is not faulted NC 4 Alarm 2 is faulted NO 5 COM 6 Alarm 2 is not faulted NC 7 Alarm 3 is faulted NO 8 COM 9 Alarm 3 is not faulted NC

• Alarm 1 = Not used

• Alarm 2 = TX

• Alarm 3 = RX

3.2.6 RF Output Connector (CP1)

CP1 is a 50Ω Type N connector for the TX IF signal. In normal operation, the output will be a QPSK (Optional: OQPSK or 8PSK) or BPSK modulated result of the Data I/O connector between 950 to 1750 MHz, in 100 Hz steps

3.2.7 External Reference (CP2)

CP2 is a BNC connector for an EXT REF. The input impedance is 75Ω. For normal operation, the desired carrier signal level is ≥ 0 dB. EXT REF frequencies are EXT 1, EXT 5, EXT 10, and EXT 20 MHz.

3.2.8 RF Input Connector (CP3)

CP3 is a 75Ω, Type F Female connector for an RX IF signal.

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SNM-1001L Satellite Modem Revision 1 Connector Pinouts MN/SNM1001L.IOM

3.2.9 AC Power Connector

A standard, detachable, non-locking, 3-prong power cord (IEC plug) supplies the Alternating Current (AC) power to the modem. Observe the following:

Input Power Input Voltage

Connector Type Fuse Protection

55W maximum, 40W typical 90 to 132 or 175 to 264 VAC Unit switches ranges automatically I.E.C 1A slo-blo Line and neutral fusing 5 mm type fuses

3.2.10 Ground Connector (GND)

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

Note: The AC power connector provides the safety ground.

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SNM-1001L Satellite Modem Revision 1 Connector Pinouts MN/SNM1001L.IOM

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3–12

Chapter 4. FRONT PANEL

4.1 Front Panel

The modem front panel (Figure 4-1) enables control of modem configuration parameters and displays the modem status.

TRANSMIT

SNM-1001L

Satelli te Modem

SNM -1010 Data ControlM odem

RECEIVE

Figure 4-1. Front Panel View

TRANSMIT

RECEIVE

COMMON

STORED

POWER ON

OPWERON

NSMITTERON

RRIE R D E TE CT

RRIER DETECT

EST M ODE

TEST MODE

OPERATION

ENTER

CLE

The front panel features include:

• 32-character, 2-line LCD display

• 6-button keypad for local control

• 10 LEDs to provide overall status at a glance

All functions are accessible at the front panel by entering one of six pre-defined Function Select categories or levels:

• Configuration

• Monitor

• Faults/Alarms

• Stored Faults/Alarms

• AUPC

• Utility

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SNM-1001L Satellite Modem Revision 1 Front Panel Operation MN/SNM1001L.IOM

4.1.1 LED Indicators

The 10 LEDs on the front panel indicate:

• General modem summary faults

• Status

• Alarms

The indicators are defined in Table 4-1 as follows:

Table 4-1. LED Indicators

Name LED Meaning

Faults

Transmit Red A fault condition exists in the transmit chain. Receive Red A fault condition exists in the receive chain. Common Red A common equipment fault condition exists. Stored Yellow A fault has been logged and stored.

The fault may or may not be active.

Status

Power On Green Power is applied to the modem. Transmitter On Green Transmitter is currently on.

This indicator reflects the actual condition of the transmitter, as

opposed to the programmed condition. Carrier Detect Green Decoder is locked. Test Mode Yellow Flashes when the modem is in a test configuration.

Alarms

Transmit Yellow A transmit function is in an alarm condition. Receive Yellow A receive function is in an alarm condition.

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SNM-1001L Satellite Modem Revision 1 Front Panel Operation MN/SNM1001L.IOM

4.1.2 Front Panel Keypad

The front panel keypad permits local operation of the modem. The keypad consists of six keys (Figure 4-2).

ENTER

CLEAR

Figure 4-2. Keypad

Each key provides one or more logical functions. These functions are defined in the following table.

ENTER

CLEAR

Left and Right Diamond Keys

Top and Bottom Diamond Keys

This key is used to select a displayed function or to execute a modem configuration change.

This key is used to back out of a selection or to cancel a configuration change, which has not been executed using [ENTER]. Pressing [CLEAR] generally returns the display to the previous selection.

These keys are used to move to the next selection or to move the cursor for certain functions.

Note: Throughout this chapter, [←] and [→] are used to indicate left and right diamond keys.

These keys are used primarily to change configuration data (numbers). At times, they are also used to move from one section to another.

Note: Throughout this chapter, [↑] and [↓] are used to indicate top and bottom diamond keys.

The modem responds by beeping whenever a key is pressed:

• A single beep indicates a valid entry and the appropriate action was taken.

• A double beep indicates an invalid entry or a parameter is not available for operation.

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SNM-1001L Satellite Modem Revision 1 Front Panel Operation MN/SNM1001L.IOM

4.2 Menu System

Note: The menus show features and options that are not available. However, they are shown to preserve the menu structure and reserve the structure for the future. This does not imply an intent or obligation to add these features or options in the future.

Use the Main menu in Figure 4-3 as a quick reference for accessing the modem functions. When

the modem power is applied, the base level of the menu system displays the sign-on message:

• • Line 1 of the sign-on message is the modem model number and type.

• • Line 2 is the version number of the firmware.

The main level of the menu system is Function Select. To access this level from the sign-on message, press the [←] or [→] keys. From the Function Select menu; select one of the functional categories:

• Configuration

• Monitor

• Faults/Alarms

• Stored Faults/Alarms

• Remote AUPC (ASYNC mode only)

• Utility

Press [←] or [→] to move from one selection to another. When line 2 displays the desired function, select that level by pressing [ENTER]. After entering the appropriate functional level, press [←] or [→] to move to the desired function.

To view or change the modem’s configuration, enter the Configuration level from the Function Select menu. Once in the Configuration menu, press [←] or [→] to scroll through the Configuration menu selection:

• Modulator

• Demodulator

• Interface

• AUPC

• Save

• Recall

Press [ENTER] to select the desired Configuration menu option. To view the options for the selected configuration parameters, press [←] or [→]. To change a configuration parameter, press [ENTER] to begin the change process.

Press [↑] or [↓] to change the parameters. After the display represents the correct parameters, press [ENTER] to execute the change. This action initiates the necessary programming by the modem.

To undo a parameter change prior to execution

, press [CLEAR].

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SNM-1001L Satellite Modem Revision 1 Front Panel Operation MN/SNM1001L.IOM

Notes:

1. Figure 4-3 list the front panel menu window selections.

2. Comtech EF Data recommends that selection of the desired Modem Type be made prior to making any other setting. This procedure is located in the Utility Modem Type menu.

3. Menus or commands that are specific to certain modem configurations are only accessible after selecting the appropriate modem configuration. This prevents incompatible parameters from accidentally being selected.

4. All of the windows are accessible in the Custom mode. Take caution not to select incompatible parameters, as the modem does not shut out incompatible command choices in the Custom mode.

4.2.1 Revision Emulation

To program an emulation mode from Version X.X.X through the current version, use the revision emulation feature in the Utility: Modem Type menu.

Software Version # Firmware # Rev. Description of Change

2.1.12 FW/8460-1 M Original issue

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SNM-1001L Satellite Modem Revision 1 Front Panel Operation MN/SNM1001L.IOM

4.2.2 Menu Tree

SELECT (4.3)

CONFIGURATION MONITOR FAULTS/ALARMS STORED FLTS/ALMS REMOTE AUPC UTILITY

CONFIGURATION (4.3.1)

MODULATOR DEMODULATOR INTERFACE LOCAL AUPC SAVE RECALL

MONITOR (4.3.2)

RAW BER CORRECTED BER Eb/No RECEIVE SIGNAL SWEEP FREQUEN CY BUFFER FILL FRAME ERRORS LNB CURRENT LNB VOLTAGE ODU CURRENT ODU VOLTAGE ODU OUTPUT LEVEL ODU TEMPERATURE ODU PLL LOCK ODU SOFTWARE ODU POWER CLASS TX L-BAND FREQ RX L-BAND FREQ

FAULTS/ALARMS (4.3.3)

MODULATOR DEMODULATOR TX INTERFACE RX INTERFACE COMMON OUTDOOR UNIT

STORED FLT S/ALMS (4.3.4)

MODULATOR DEMODULATOR TX INTERFACE RX INTERFACE COMMON OUTDOOR UNIT UNAVIL SECONDS CLEAR

REMOTE AUPC (4.3.5)

CONFIGURATION MONITOR

UTILIT Y (4.3.6)

MODULATOR DEMODULATOR INTERFACE OUTDOOR UNIT SYSTEM MODEM TYPE SETUP

TX-X CODE/DATA RAT E TX-IF FREQUENCY TX TERMINAL FREQ TX-IF OUTPUT TX POWER L EVEL SCRAMBLER DIFF. ENCODER CARRIER MODE MODEM REFERENCE FSK OUTPUT ODU POWER SUPPLY ODU OUTPUT DELAY ODU 10 MHz REF RS ENCODER

RX-X CODE/DATA RATE RX-IF FREQUENCY RX TERMINAL FREQ DESCRAMBLER DIFF. DECODER RF LOOP BACK IF LOOP BACK BER THRESHOLD SWEEP CENTER SWEEP RANGE REACQUISITION LNB POWER LNB VOLTAGE LNB 10 MHz REF RS DECODER

TX CLOCK SOURCE TX CLOCK PHASE EXT-CLK FREQ BUFFER CLOCK RX CLOCK PHASE B-BAND LOOP BACK INTRFC LOOP BACK BUFFER SIZE BUFFER CENTER LOOP TIMING TX DATA FAULT

LOCAL AUPC AUPC ENABLE NOMINAL POWER MINIMUM PO WER MAXIMUM POWER TARGET EB/NO TRACKING RATE LOCAL CL ACTION REMOTE CL ACTION

ASSIGNED TRANSMIT F ILTERS TX TERMINAL LO MOD POWER OFFSET MODULATOR TYPE ENCODER TYPE SCRAMBLER TYPE TX BPSK ORDERING MOD SPECTRUM TX-RS N/K DEEP TX IESS-310 TX MODE ODU ALARM - LOW ODU ALARM - HIGH RF MODE CONTROL TX SYMBOL RATE

ASSIGNED RECEIVE FIL TERS RX TERMINAL LO DEMODULATOR TYPE DECODER TYPE DESCRAMBLER TYPE RX BPSK ORDERING RX MODE MAX PACKET SIZE DEMOD SPECTRUM RX-RS N/K DEEP RX IESS-310 MODE LNB ALARM - LOW LNB ALARM - HIGH RX SYMBOL RATE

TX OVERHEAD TYPE RX OVERHEAD TYPE BUFFER PROGRAM FRAMING STRUCTURE RTS TX-IF CNT RL TX DATA PHASE RX DATA PHASE CTS DELAY

ODU FSK ADDRESS ODU OUTPUT POWER ODU PWR LEVELING

TIME/DATE REMOTE BAUD RATE REMOTE ADDRESS REMOTE TYPE OPERATION MODE YEAR DISPLAY TEST MODE STATUS LAMP TEST SELF TEST DISPLAY CONTRAST M&C FIRMWARE BOOT FIRMWARE FPGA FIRMWARE TURBO FIRMWARE DEMO MODE EXT AGC: MIN/MAX PW R MASTER RESET

MODEM TYPE INTELSAT DATA NRZ DATA I/O MODEM OPTIONS CARD #X TYPE CARD #X OPTIONS LOCAL MODEM AUPC MODEM SERIAL # CARD #X SERIAL CONFIGURATION CODE - MODEM CONFIGURATION CODE - CARD #X

Figure 4-3. Menu Tree

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SNM-1001L Satellite Modem Revision 1 Front Panel Operation MN/SNM1001L.IOM

4.3 OPENING SCREEN

This screen is displayed whenever power is first applied to the unit.

SNM-1001L CUSTOM VER: X.X.X

Press [→] key to go to the any of the following FUNCTIONAL SELECT menu screens

• CONFIGURATION

• MONITOR

• FAULTS/ALARMS

• STORED FLTS/ALMS

• UTILITY

Note: At any time, pressing CLEAR will return to a main heading.

4.3.1 FUNCTION SELECT: CONFIGURATION

FUNCTIONAL SELECT

CONFIGURATION

Press [→] key to go to any of the following sub-menus. Press <ENTER> to review or edit the menu.

CONFIGURATION MODULATOR

CONFIGURATION DEMODULATOR

CONFIGURATION INTERFACE

CONFIGURATION LOCAL AUPC

CONFIGURATION SAVE

CONFIGURATION RECALL

Permits the user to configure the modulator portion of the modem.

Permits the user to configure the demodulator portion of the modem.

Permits the user to configure the interface portion of the modem.

Permits the user to configure the AUPC parameters of the modem.

Permits the user to save the configuration of the modem to non-volatile memory.

Permits the user to configure the modem with a previously saved configuration.

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SNM-1001L Satellite Modem Revision 1 Front Panel Operation MN/SNM1001L.IOM

4.3.1.1 FUNCTION SELECT: CONFIGURATION: MODULATOR

CONFIGURATION

MODULATOR

Press <ENTER > to review or edit the following sub-menus.

FUNCTION SELECT: CONFIGURATION: MODULATOR: TX-X CODE/DATA RATE

TX-A QPSK 1/2

64.000 Kbps

TX-B QPSK 1/2

128.000 Kbps

TX-C QPSK 1/2

256.000 Kbps

TX-D QPSK 1/2

512.000 Kbps

TX-V QPSK 1/2

38.400 Kbps

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SNM-1001L Satellite Modem Revision 1 Front Panel Operation MN/SNM1001L.IOM

Upon entry, the current transmitter rate is displayed with the flashing cursor on the first character of the code rate on line 1. Line 2 displays the data rate. Press [←] or [→] to make the selection. To select the currently defined variable data rate, select TX-V, and press <ENTER> twice.

To change the rate using the variable rate selection, press <ENTER> when TX-V is displayed. A flashing cursor is displayed on the first character of the coding type on line 1. Press [←] or [→] to move the flashing cursor, and [↑] or [↓] to increment or decrement the digit at the flashing cursor. Press <ENTER> to execute the change.

Notes:

1. When the TX rate has been programmed, the transmitter is automatically turned off to

prevent swamping of other channels. To turn the transmitter on, use the TX-IF Output function.

2. Code Rate 3/4 not compatible with a combination of a CSC Closed Modulator Type and

Sequential Encoder.

Continuous Mode Data Ranges

Code Rate Data Rate Range

BPSK 1/2 2.4 to 1250 kbps Offset QPSK 1/2 4.8 to 2500 kbps Offset QPSK 3/4 7.2 to 3750 kbps QPSK 7/8 8.4 to 4375 kbps 8-PSK 2/3 64.0 to 5000 kbps BPSK 1/1 4.8 to 2500 kbps Offset QPSK 1/1 9.6 to 5000 kbps

BPSK 21/44 2.4 to 1193.181 kbps BPSK 5/16 2.4 to 781.25 kbps Offset QPSK 1/2 4.8 to 2386.363 kbps 8-PSK 3/4 384 to 5000 kbps

Burst Mode Data Ranges

QPSK 1/2 19.2 and 57.6 kbps

Non-Turbo Requirements

Turbo Requirements

Code Rate Data Rate Range

Notes:

1. Max Symbol Rate = 2500 ksps

2. Max Data Rate for Low Var. Rate: 512 kbps.

3. Offset QPSK Option only: Offset QPSK 1/2, 3/4, and 7/8

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SNM-1001L Satellite Modem Revision 1 Front Panel Operation MN/SNM1001L.IOM

FUNCTION SELECT: CONFIGURATION: MODULATOR: TX-IF FREQUENCY (CONDITIONAL)

TX-IF FREQUENCY

1200.0000 MHz

Conditional: This menu is displayed when LO is programmed to 0

IMPORTANT

Programs the modulator transmit frequency between 950 and 1750 MHz, in 100 Hz steps.

Upon entry, the current transmitter frequency is displayed with the flashing cursor on the first character. Press [←] or [→] to move the flashing cursor, and [↑] or [↓] to increment or decrement the digit at the flashing cursor. Press <ENTER> to execute the change.

Note: When the transmitter frequency is changed, the transmitter is automatically turned off to prevent the possible swamping of other channels. To turn the transmitter on, use the TX-IF Output function.

under Utility: Modulator: TX Terminal LO menu.

FUNCTION SELECT: CONFIGURATION: MODULATOR: TX TERMINAL FREQUENCY (CONDITIONAL)

TX TERMINAL FREQUENCY

5845.0000 MHz

Conditional: This menu is available only when TX Terminal LO and Mix

IMPORTANT

The reminder of the functions is the same as TX-IF Frequency.

Note: This menu permits programming the TX frequency of the satellite terminal, including the modem and ODU/BUC. When properly setup, it indicates the frequency radiated toward the satellite.

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are programmed under Utility: Modulator menu.

SNM-1001L Satellite Modem Revision 1 Front Panel Operation MN/SNM1001L.IOM

FUNCTION SELECT: CONFIGURATION: MODULATOR: TX-IF OUTPUT

TX-IF OUTPUT

OFF

Programs the modulator output On or Off. Upon entry, the current status of the output is displayed. Press [↑] or [↓] to make the selection. Press <ENTER> to execute the change.

FUNCTION SELECT: CONFIGURATION: MODULATOR: TX POWER LEVEL

TX POWER LEVEL

- 10.0 dBm

Programs the modulator output power level from 0 to -40 dBm

Upon entry, the current transmitter power level is displayed with the flashing cursor on the first character. Press [↑] or [↓] to increase or decrease the output power level in 0.1 dBm steps. Press <ENTER> to execute the change.

TX POWER LEVEL

-10.0 dBm (ADJ)

This menu appears when:

1. ODU Power Leveling is On (Utility: Outdoor Unit), or

2. The MOD Power Offset (Utility: Modulator is ≠ 0 dB.).

3. (ADJ) appears after the power level in the TX Power Level screen when this menu is active.

Notes:

1. When Power Leveling is Enabled, manual changes to the output level are inhibited, and the menu indicates the TX Power Level TX by the modulator.

2. When MOD power offset is active the output power is adjusted [↑] and [↓] with arrow keys. However, the value indicated in the display is:

Modulator Power Level + Offset

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FUNCTION SELECT: CONFIGURATION: MODULATOR: SCRAMBLER

SCRAMBLER

Programs the scrambler On or Off.

Upon entry, the current status of the scrambler is displayed. Press [↑] or [↓] to make the selection. Press <ENTER> to execute the change.

FUNCTION SELECT: CONFIGURATION: MODULATOR: DIFF. ENCODER

DIFF. ENCODER

Programs the differential encoder On or Off.

Upon entry, the current status of the scrambler is displayed. Press [↑] or [↓] to make the selection. Press <ENTER> to execute the change.

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FUNCTION SELECT: CONFIGURATION: MODULATOR:

CARRIER MODE

NORMAL-MODULATED

Programs the modem for alternate carrier modes. All modes, except Normal-Modulated are Test Modes. Four modes of operation are available:

NORMAL-MODULATED

CENTER-CW

DUAL-CW

OFFSET-CW

Upon entry, the Center mode is displayed. To activate this test mode, press <ENTER>. Press [↑] or [↓] to select the desired mode. To return to the Configuration menu, press [CLEAR].

This mode is normally selected.

Generates a CW-carrier at the current modulator frequency. This can be used to measure the output frequency.

Generates a dual side-band suppressed carrier signal. Side-bands are at one-half of the symbol rate from the carrier. This is used to check the channel balance and carrier null.

Generates a single, upper, side-band-suppressed carrier signal. The upper sideband is at one-quarter of the symbol rate from the carrier. When inverted spectrum is selected, this generates a single, lower, side-band-suppressed carrier.

FUNCTION SELECT: CONFIGURATION: MODULATOR: MODEM REFERENCE

MODEM REFERENCE

INTERNAL

Select either: Internal, EXT1 MHz, EXT5 MHz, EXT 10MHz, EXT 20MHz, or Output 10 MHz.

Use only Internal or EXT 10 MHz with a Block Up Converter (BUC) or

IMPORTANT

Upon entry, the current status of the scrambler is displayed. Press [↑] or [↓] to make the selection. Press <ENTER> to execute the change.

Note: If any EXT REF is selected for the modem reference and is disconnected or not present at CP3, an alarm is generated, and the modem switches to its Internal Clock.

Outdoor Unit (ODU).

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FUNCTION SELECT: CONFIGURATION: MODULATOR:

FSK OUTPUT

OFF

Note: FSK is operational only with a BUC or ODU that incorporates FSK capabilities.

Programs the FSK Output On or Off. Upon entry, the current status of the FSK Output is displayed. Press [↑] or [↓] to make the selection. Press <ENTER> to execute the change.

The modem will attempt to communiate with the ODU/BUC when the FSK is tuned On. When the communicateions are successful the Monitor menu willl indicate the ODU Output Level, ODU Temperature, ODU, PLL Lock, ODU Software, and ODU Power Class ( for BUCs that support these parameters). If communications are not established then all of the following are indicated as faults under the Faults/Alarms: Outdoor Unit menu: Temperature, PLL Lock, and Checksum.

Every 10 seconds the modem will try to re-establish FSK communications. It is possible the address the modem is using to contast the ODU/BUC differs from the address in the ODU/BUC. Usually the default address = 1. Check this at the ODU FSK Address menu located under the Utility: Outdoor Unit menu.

FUNCTION SELECT: CONFIGURATION: MODULATOR: ODU POWER SUPPLY

ODU POWER SUPPLY

OFF

Programs the ODU Power Supply On or Off. DC power is transmitted up the center conductor of the TX-IF connector. Upon entry, the current status of the ODU Power is displayed. Press [↑] or [↓] to make the selection. Press <ENTER> to execute the change.

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FUNCTION SELECT: CONFIGURATION: MODULATOR: ODU OUTPUT DELAY

ODU OUTPUT DELAY

00.00 MIN SEC

Programs the ODU Output delay with 0.0 to 20.00 minutes. At power up, the M&C delays carrier turn On by the programmed time. During output delay timeout, the front panel carrier On LED flashes and the ODU output delay screen shows the remaining delay time.

Normally, when using this feature, the ODU 10MHz reference is On and the ODU Power Supply is On. This allows the ODU or BUC time to warm-up before the carrier is transmitted. Upon entry, the current status of the ODU Output Delay is displayed. Press [↑] or [↓] to make the selection. Press <ENTER> to execute the change.

FUNCTION SELECT: CONFIGURATION: MODULATOR: ODU 10 MHz REF

ODU 10 MHz REF

OFF

Programs the ODU 10 MHz REF On or Off. The reference is transmitted up the center conductor of the TX-IF connector.

Upon entry, the current status of the ODU 10 MHz REF is displayed. Press [↑] or [↓] to make the selection. Press <ENTER> to execute the change.

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FUNCTION SELECT: CONFIGURATION: MODULATOR: RS ENCODER (CONDITIONAL)

RS ENCODER

OFF

Conditional: Reed-Solomon option only.

IMPORTANT

Programs the Reed-Solomon Encoder On or Off.

Upon entry, the current status of the Reed-Solomon encoder is displayed. Press [↑] or [↓] to make the selection. Press <ENTER> to execute the change.

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4.3.1.2 FUNCTION SELECT: CONFIGURATION: DEMODULATOR

CONFIGURATION

DEMODULATOR

Press <ENTER> to review or edit the following sub-menus.

FUNCTION SELECT: CONFIGURATION: DEMODULATOR: RX-X CODE/DATA RATE

RX-A QPSK 1/2

64.000 Kbps

RX-B QPSK 1/2

128.000 Kbps

RX-C QPSK 1/2

256.000 Kbps

RX-D QPSK 1/2

512.000 Kbps

RX-V QPSK 1/2

38.400 Kbps

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To change the rate using the variable rate selection, press [ENTER] when RX-V is displayed. A flashing cursor is displayed on the first character of the coding type on line 1. Press [←] or [→] to move the flashing cursor, and [↑] or [↓] to increment or decrement the digit at the flashing cursor. Press [ENTER] to execute the change.

Notes:

1. When the RX rate has been programmed, the transmitter is automatically turned off to prevent swamping of other channels. To turn the transmitter on, use the RX-IF Output function.

2. Code Rate 3/4 not compatible with a combination of a CSC Closed Modulator Type and Sequential Encoder.

Continuous Mode Data Range

Code Rate Data Rate Range

BPSK 21/44 2.4 to 1193.181 kbps BPSK 5/16 2.4 to 781.25 kbps Offset QPSK 1/2 4.8 to 2386.363 kbps 8-PSK 3/4 384 to 5000 kbps

Burst Mode Data Range

QPSK 1/2 19.2 and 57.6 kbps

Non-Turbo Requirements

Turbo Requirements

Code Rate Data Rate Range

Notes:

1. Max Symbol Rate = 2500 ksps

2. Max Data Rate for Low Var. Rate: 512 kbps.

3. Offset Qffset PSK Option only: Offset QPSK 1/2, 3/4, and 7/8

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FUNCTION SELECT: CONFIGURATION: DEMODULATOR: RX-IF FREQUENCY (CONDITIONAL)

RX-IF FREQUENCY

1200.0000 MHz

Conditional: This menu is displayed when LO is programmed to 0

IMPORTANT

Programs the demodulator receive frequency between 950 and 1750 MHz, in 100 Hz steps.

Upon entry, the current receive frequency is displayed with the flashing cursor on the first character. Press [←] or [→] to move the flashing cursor, and [↑] or [↓] to increment or decrement the digit at the flashing cursor. Press <ENTER> to execute the change.

under Utility: Demodulator: RX Terminal LO menu.

FUNCTION SELECT: CONFIGURATION: DEMODULATOR: RX TERMINAL FREQUENCY (CONDITIONAL)

RX TERMINAL FREQUENCY

4200.0000 MHz

Conditional: This menu is available only when RX Terminal LO and Mix

IMPORTANT

The reminder of the functions is the same as RX-IF Frequency.

Note: This permits programming of the RX frequency of the satellite terminal, including the modem and LNB. When properly setup it indicates the satellite frequency of the desired RX carrier received from the satellite.

4–19

are programmed under Utility: Demodulator menu.

SNM-1001L Satellite Modem Revision 1 Front Panel Operation MN/SNM1001L.IOM

FUNCTION SELECT:CONFIGURATION:DEMODULATOR:

DESCRAMBLER

Programs the descrambler On or Off.

Upon entry, the current status of the descrambler is displayed. Press [↑] or [↓] to make the selection. Press <ENTER> to execute the change.

FUNCTION SELECT:CONFIGURATION:DEMODULATOR:

DIFF. DECODER

Programs the differential decoder On or Off.

Upon entry, the current status of the differential decoder is displayed. Press [↑] or [↓] to make the selection. Press <ENTER> to execute the change.

FUNCTION SELECT: CONFIGURATION: DEMODULATOR: RF LOOP BACK

RF LOOP BACK

OFF

This is a Test Mode.

IMPORTANT

Programs the modem for RF loopback operation. When RF loopback is turned on, the demodulator is programmed to the same frequency as the modulator. When RF loopback is turned off, the demodulator is tuned to the previous frequency. Refer to (Figure 4-4) for a block diagram of RF loopback operation.

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Note: RF loopback nullifies IF loopback.

Upon entry, the current status of the RF loopback is displayed. Press [↑] or [↓] to make the selection. Press [ENTER] to execute the change.

CUSTOMER

DATA

REMOTE SERI AL

INTERFACE

FAULT IND ICATORS

DATA

INTERFACE

SATELLITE MODEM

ENCO DER/

MODULATOR

MICRO-

COMP UTER

DEMODULATOR

DECODER

TX = 1200 MHz

SUPPLY

POWER

RX = 1225 MHz

RF LBK = 1200 MHz

LOOPBACK CHANGES DEMOD RECEIVE FREQU ENCY TO 70 MHz WI THOUT LOSI NG ORIGINAL PROGRAMMING INFORMATION.

TRANSMIT RF

EQUIPMENT

AC P OWER

RECEIVE RF EQUIPMENT

ANTENNA

Figure 4-4. RF Loopback

Note: When RF loopback is turned on, the demodulator receive frequency is programmed to be the same frequency as the modulator transmit frequency. This test mode will verify the satellite link without changing the programmed frequency of the demodulator. When RF loopback is turned off, the demodulator is programmed back to the previous frequency.

FUNCTION SELECT: CONFIGURATION: DEMODULATOR: IF LOOP BACK

IF LOOP BACK

OFF

This is a Test Mode.

IMPORTANT

Programs the modem for IF loopback operation. When IF loopback is turned on, the demodulator input is connected to the modulator output through an internal attenuator and the modulator continues to TX a signal. The demodulator is programmed to the same frequency as the modulator. When IF loopback is turned off, the demodulator is tuned to the previous frequency and is reconnected to the IF input. Refer to Figure 4-5 for a block diagram of IF loopback operation.

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Note: IF loopback nullifies RF loopback.

C U S T O M E R

R E M O T E S E R I A L

I N T E R F A C E

F A U L T I N D I C A T O R S

A T A

DATA

INTERFACE

A T E L L I T E M O D E M

ENCO DER/

MOD UL

TOR

MICR O-

COM PUT ER

DEM ODULATOR/

DECO DE R

POWER S UPP LY

T R

A N S M I T R F

E Q U I P M E N T

AC P O W E R

R E C E I V E R F E Q U I P M E N T

NTEN N

Figure 4-5. IF Loopback

Note: When IF loopback is turned on, the demodulator is looped back to the modulator inside the modem and the demodulator is

programmed to the same frequency as the modulator. This test mode will verify the operation of the modem. When IF loopback is turned off, the demodulator is programmed back to the previous frequency and is reconnected to the IF input.

FUNCTION SELECT: CONFIGURATION: DEMODULATOR: BER THRESHOLD

BER THRESHOLD

NONE

Sets the BER threshold. If the BER threshold set is exceeded, a receive fault will be indicated by the modem status indicators. BER threshold may be set from 1.0 E-3 to 1.0 E-8, or may be disabled by specifying NONE.

Upon entry, the current setting of the BER threshold is displayed. Press [↑] or [↓] to select the desired setting. Press <ENTER> to execute the change.

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FUNCTION SELECT: CONFIGURATION: DEMODULATOR: SWEEP CENTER

SWEEP CENTER

+ 0 Hz

Programs the sweep center frequency for the directed sweep function. When in directed sweep, the value from the sweep monitor screen (when the modem was last locked) should be entered for the sweep center frequency. The sweep center frequency can be set in the range from -75000 to +75000 Hz.

FUNCTION SELECT: CONFIGURATION: DEMODULATOR: SWEEP RANGE

SWEEP RANGE

60000 Hz

Programs the overall travel of the sweep width range during acquisition in the directed sweep mode. The sweep width may be set from 0 to 1,000,000 Hz. When set at 60000 Hz, the modem is in the default acquisition mode. The smaller the range, the faster the modem will lock, provided the receive carrier center frequency is within the RX IF frequency sweep range.

Upon entry, the current programmed setting is displayed. Press [←] or [→] to move the flashing cursor. Press [↑] or [↓] to increment or decrement the digit at the flashing cursor. Press <ENTER> to execute the change.

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FUNCTION SELECT: CONFIGURATION: DEMODULATOR: REACQUISITION

REACQUISITION

0 SECONDS

Programs the sweep reacquisition mode time duration. This is the time that the modem will remain in a narrow sweep after loss of acquisition. After this timer runs out, the modem will return to the normal acquisition sweep. The reacquisition time is 0 to 999 seconds.

Upon entry, the current programmed setting is displayed with a flashing cursor on the first character. Press [←] or [→] to move the flashing cursor. Press [↑] or [↓] to increment or decrement the digit at the flashing cursor. Select the number of seconds desired for the reacquisition mode. Press <ENTER> to execute the change.

FUNCTION SELECT: CONFIGURATION: DEMODULATOR: LNB POWER

LNB POWER

OFF

Programs the LNB Power On or Off. The LNB voltage is transmitted up the center conductor of the RF-IF connector.

Upon entry, the current status of the descrambler is displayed. Press [↑] or [↓] to make the selection. Press <ENTER> to execute the change.

FUNCTION SELECT: CONFIGURATION: DEMODULATOR: LNB VOLTAGE

LNB VOLTAGE

13 VDC

Programs the LNB Power at 13, 18, or 24 VDC.

Upon entry, the current status of the descrambler is displayed. Press [↑] or [↓] to make the selection. Press <ENTER> to execute the change.

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FUNCTION SELECT: CONFIGURATION: DEMODULATOR: LNB 10 MHZ REF

LNB 10 MHz REF

OFF

Programs the LNB 10 MHz REF to On or OFF. The LNB 10 MHz reference is transmitted out the center conductor of the RF-IF connector.

Upon entry, the current status of the descrambler is displayed. Press [↑] or [↓] to make the selection. Press <ENTER> to execute the change.

FUNCTION SELECT: CONFIGURATION: DEMODULATOR: RS DECODER

RS DECODER

OFF

Programs the Reed-Solomon decoder On, Off, or Correction_Off.

Upon entry, the current status of the Reed-Solomon decoder is displayed. Use [↑] or [↓] to select one of the following modes:

CORRECTION_OFF

OFF

Press [ENTER] to execute the change.

If none of the proper overhead types or data rates apply, the ReedSolomon decoder in the On state will be rejected (double beep). With the Reed-Solomon decoder turned On (not off or Correction_ Off), the

IMPORTANT

corrected BER will be reported from the outer decoder (Reed-Solomon decoder).

Enables the Reed-Solomon decoder to provide data error corrections. This is the Normal operating Mode.

Turns off the Reed-Solomon decoder data error correction circuitry. Data flow is then routed through normal data paths without error corrections. This is a Test Mode.

The RS decoder is normally disabled (off position). To execute any of the Reed-Solomon decoder modes, enter the desired Reed-Solomon decoder and select the desired mode. This is a Test Mode.

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4.3.1.3 FUNCTION SELECT: CONFIGURATION INTERFACE

CONFIGURATION

INTERFACE

Press <ENTER > to review or edit the following sub-menus.

FUNCTION SELECT: CONFIGURATION: INTERFACE: TX CLOCK SOURCE

TX CLOCK SOURCE

TX TERRESTRIAL

Programs the clock source for the modem transmitter clock to the following configurations:

TX TERRESTRIAL

SCT (INTERNAL)

EXT. CLOCK/DATA CLOCK

Upon entry, the current transmit clock setting is displayed. Press [↑] or [↓] to make the selection. Press <ENTER> to execute the change.

Sets the TX clock to recover timing from the incoming clock/data.

Sets the TX clock to operate from the modem internal clock (this is also the fallback clock).

Note: When loop timing is enabled, SCT (LOOP) is displayed

instead of SCT (INTERNAL).

Sets the TX clock to operate from the external reference clock (Ext Clock). TX Data Rate and Ext Clock frequency shall match or unless the ASLT option is installed. The correct frequency must be programmed into EXT-CLK FREQ.

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FUNCTION SELECT: CONFIGURATION: INTERFACE: TX CLOCK PHASE

TX CLOCK PHASE

AUTO

Programs the TX clock phase to AUTO, NORMAL, or INVERT.

Note: AUTO is the default.

Upon entry, the current setting of the TX clock phase is displayed. Press [↑] or [↓] to make the selection. When AUTO is selected, the modem will automatically select NORMAL or INVERT to properly phase the TX clock with the TX data. Press <ENTER> to execute the change.

FUNCTION SELECT: CONFIGURATION: INTERFACE: EXT-CLK FREQ

EXT-CLK FREQ

1544.000 KHz

Programs the EXT REF clock input frequency between 8.000 kHz and 10000.000 kHz.

Notes:

1. When an ODU or BUC is operated with an EXT REF, 10 MHz is required.

2. The clock rate shall be equal to the data rate unless the asymmetrical loop timing option is present.

This clock frequency can be any multiple of 600 Hz from 2.4 to 64 kHz, and can be any multiple of 8 kHz from 64 kHz to 4.376 MHz. This can be used for the Doppler/ Plesiochronous buffer reference. It can be a reference to SCT. Use the master clock input on J8 for the external master reference. The EXT REF on CP3 only allows for 1, 5, 10, and 20 MHz EXT REF input.

Upon entry, the current setting for the EXT REF is displayed. Press [←] or [→] to increment or decrement the digit at the flashing cursor. Press <ENTER> to execute the change.

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FUNCTION SELECT: CONFIGURATION: INTERFACE: BUFFER CLOCK

BUFFER CLOCK

RX (SATELLITE)

Programs the interface buffer output clock to one of the following modes:

RX (SATELLITE)

SCT (INTERNAL)

EXT. CLOCK

TX TERRESTRIAL

Upon entry, the current setting of the plesiochronous buffer clock is displayed. Press [↑] or [↓] to make the selection. Press <ENTER> to execute the change.

Sets the output buffer clock to the satellite clock. (Bypasses the buffer.)

Sets the buffer clock to operate from the modem internal clock. This is also the fallback clock

Sets this clock source to the external clock.

Sets the buffer output clock to recover timing from the incoming TX data clock.

FUNCTION SELECT: CONFIGURATION: INTERFACE: RX CLOCK PHASE

RX CLOCK PHASE

NORMAL

Programs the RX clock phase to Normal or Inverted.

Upon entry, the current status of the RX Clock is displayed. Press [↑] or [↓] to make the selection. Press <ENTER> to execute the change.

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FUNCTION SELECT: CONFIGURATION: INTERFACE: B-BAND LOOP BACK

B-BAND LOOP BACK

OFF

This is a Test Mode.

IMPORTANT

Programs the modem for baseband loopback operation. When baseband loopback is turned on, the data and timing signals are switched from the demodulator to the modulator on the modem side of the interface. The DTE baseband signals are also looped back from the transmitter data and clock to receiver data and clock on the customer side of the interface. This is a bi-directional loopback of the baseband data. Refer to Figure 4-6 for a block diagram of baseband loopback operation.

C U S T O M E R

A T A

R E M O T E S E R I

I N T E R F

C E

A U L T I N D I C A T O R S

DATA

I N T E R F

A C E

T EL L I T E M O D E M

ENCODER/

TOR

MODUL

MICRO-

COMPUTER

DEMODULATOR/

DECODER

POWER SUPPLY

A N S M I T R F

T R

E Q U I P M E N T

C P O W E R

R E C E I V E R F

E Q U I P M E N T

NTENN

Figure 4-6. Baseband Loopback

Note: When baseband loopback is turned on, data is looped back on the customer side of the interface. This is a bi-directional loopback

of the baseband data. This test mode will verify the customer equipment and cabling between the modem and the customer equipment.

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FUNCTION SELECT: CONFIGURATION: INTERFACE: INTRFC LOOP BACK (CONDITIONAL)

INTRFC LOOP BACK

OFF

This is a Test Mode. Conditional: This menu is only available when the

IMPORTANT

Programs the modem for Interface Loopback operation. When INTERFACE LOOPBACK is turned on, data is looped back at the modem side of the interface. This is a bi-directional loop back of the data after the base band data has had the overhead added. Refer to Figure 4-7 for the interface loopback block diagram.

Upon entry, the current status is displayed. [↑] or [↓] to make the selection. Press [ENTER] to execute the change.

overhead interface PCB or Reed-Solomon PCB is installed.

C U S T O M E R

A T A

R E M O T E S E R I

A C E

I N T E R F

U L T I N D I C A T O R S

A L

DATA

A C E

I N T E R F

T E L L I T E M O D E M

ENCODER/

TOR

MODUL

MICRO-

COMPUTER

DEMODULATOR/

DECODER

POWER SUPPLY

A N S M I T R F

T R

E Q U I P M E N T

C P O W E R

R E C E I V E R F E Q U I P M E N T

NTENN

Figure 4-7. Interface Loopback

Note: When interface loopback is turned on, data is looped back on the modem side of the interface. This test mode will verify the internal

channel unit interface operation.

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FUNCTION SELECT: CONFIGURATION: INTERFACE: BUFFER SIZE (CONDITIONAL)

Conditional: The Bits or Milliseconds menu is displayed depending upon whether Bits or Milliseconds is selected under the Utility:

IMPORTANT

Interface Buffer Program menu.

BUFFER SIZE

384 BITS

BUFFER SIZE

6 MILLI SECONDS

Sets the size of the buffer in either Bits or Milliseconds..

Upon entry, the current buffer length is displayed. Press [↑] or [↓] to select the desired buffer size. The buffer size is displayed in seconds or bits. Enter the Utility Interface menu to change the buffer units to seconds or bits.

• If selecting seconds, choose from 1 to 99 ms, in increments of 1 ms ≤ 2.6 Mbps or 0 (Bypass).

• If selecting bits, choose from 32 to 262144 bits, in increments of 16 bits.

• Press [ENTER] to execute the change.

Note: To have the modem calculate the plesiochronous shift, set the buffer units to ms. When a specific buffer depth is desired, set the buffer units to bits. Select bits or ms from the Utility: Interface menu.

FUNCTION SELECT: CONFIGURATION: INTERFACE: BUFFER CENTER

BUFFER CENTER

YES/NO

This configuration function is used to center the buffer. Choosing YES centers the buffer.

Press <ENTER> twice to center the buffer.

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FUNCTION SELECT: CONFIGURATION: INTERFACE: LOOP TIMING

LOOP TIMING

OFF

The On setting programs the transmit clocking to the RX satellite clock. TX and RX data rates must be equal unless the asymmetrical loop timing (ASLT) option is enabled. SCT is phase locked to the RX Satellite clock.

FUNCTION SELECT: CONFIGURATION: INTERFACE: TX DATA FAULT (CONDITIONAL)

TX DATA FAULT

NONE

Conditional: This menu is only available when the overhead interface

IMPORTANT

Transmit data fault. Press [↑] or [↓] to select one of the following modes:

NONE ALARM INDICATION SIGNAL (AIS)

DATA

Upon entry, the current TX data fault that is being monitored is displayed. Press [↑] or [↓] to make the selection. Press [ENTER] to execute the change.

PCB is installed.

The transmit interface fault Data/AIS is not activated. Sets transmit interface fault Data/AIS to monitor a fault condition of all 1s from customer data input to the modem. Sets transmit interface fault Data/AIS to monitor a fault condition of all 1s or 0s. This is referred to as a data-stable condition, which means that the data is not transitioning.

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4.3.1.4 Function SELECT: CONFIGURATION: LOCAL AUPC (Conditional)

CONFIGURATION

LOCAL AUPC

Conditional: This menu is displayed when Local Modem AUPC = ON

IMPORTANT

The menu is available in several modes:

Self-Monitoring AUPC with 1 Modem:

Remote AUPC between 2 Modems:

Press <ENTER> to review or edit sub-menus that follow. The selections are On or Off.

located under the Utility: Modem Type menu.

In this mode ASYNC is not used. This does not require the Overhead card or the Reed-Solomon cards.

The optional Reed-Solomon cards are installed and the Modem Type is AUPC located under Utility: Modem Type menu.

FUNCTION SELECT: CONFIGURATION: LOCAL AUPC: AUPC ENABLE (CONDITIONAL)

AUPC ENABLE

OFF

Conditional: This menu is displayed when Local Modem AUPC = ON

IMPORTANT

Programs the AUPC On or Off.

Upon entry, the current status is displayed. Press [↑] or [↓] to make the selection. Press <ENTER> to execute the change.

located under the Utility: Modem Type menu.

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FUNCTION SELECT: CONFIGURATION: LOCAL AUPC: NOMINAL POWER (CONDITIONAL)

NOMINAL POWER

-10.0 dBm

Conditional: This menu is displayed when Local Modem AUPC = ON

IMPORTANT

Programs the nominal power value of the AUPC. The nominal power value can range from 0 to 40 dBm, in 0.5 dBm steps.

Upon entry, the current nominal power value is displayed. Press [↑] or [↓] to increment or decrement the digit at the flashing cursor. Press <ENTER> to execute the change.

located under the Utility: Modem Type menu.

FUNCTION SELECT: CONFIGURATION: LOCAL AUPC: MINIMUM POWER (CONDITIONAL)

MINIMUM POWER

-30.0 dBm

Conditional: This menu is displayed when Local Modem AUPC = ON

IMPORTANT

Programs the minimum power level of the AUPC. The minimum power level can range from 0 to

-40 dBm, in 0.5 dBm steps.

located under the Utility: Modem Type menu.

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FUNCTION SELECT: CONFIGURATION: LOCAL AUPC: MAXIMUM POWER (CONDITIONAL)

MAXIMUM POWER

-5.0 dBm

Conditional: This menu is displayed when Local Modem AUPC = ON

IMPORTANT

Programs the maximum power level of the AUPC. The maximum power level can range from 0 to

-40 dBm, in 0.5 dBm steps.

FUNCTION SELECT: CONFIGURATION: LOCAL AUPC: TARGET EB/NO (CONDITIONAL)

located under the Utility: Modem Type menu.

Conditional: This menu is displayed when Local Modem AUPC = ON located under the Utility: Modem Type menu.

IMPORTANT

Programs the E

16.0 dB, in 0.1 dB steps

Manufacturer does not recommend a setting greater than 15.5 dB.

target set point. The Eb/N0 target set point ranges from 3.2 to

b/N0

TARGET EB/NO

6.0 dB

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FUNCTION SELECT: CONFIGURATION: LOCAL AUPC: TRACKING RATE (CONDITIONAL)

TRACKING RATE

5.0 dB/Min

Conditional: This menu is displayed when Local Modem AUPC = ON

IMPORTANT

Programs the maximum tracking rate of the AUPC.

Maximum tracking rate can range from 0.5 to 6.0 dBm/minute, in 0.5 dBm/minute steps.

located under the Utility: Modem Type menu.

FUNCTION SELECT: CONFIGURATION: LOCAL AUPC: LOCAL CL ACTION (CONDITIONAL)

LOCAL CL ACTION

HOLD

Conditional: This menu is displayed when Local Modem AUPC = ON

IMPORTANT

Programs the Local Carrier Loss action (CL) for HOLD, NOMINAL, or MAXIMUM. The modulator at the local carrier end moves to this value upon carrier loss.

HOLD

NOMINAL

MAXIMUM

located under the Utility: Modem Type menu.

Upon Carrier Loss (CL) the carrier level remains at the level just before carrier loss.

Upon CL the TX Carrier Level reverts to the Nominal Power Level programmed under Configuration: Local AUPC: Nominal Power

Upon CL the TX Carrier Level is programmed to the level programmed under Configuration: Local AUPC: Maximum Power.

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Comtech EF Data SNM-1001L User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual