CDM-QX

Table of contents

Mocomtech CDM-QX User Manual

Multi-Channel Satellite Modem with DoubleTalk™

Carrier-in-Carrier

IMPORTANT NOTE: The information contained in this document supersedes all previously published information regarding this product. Product specifications are subject to change without prior notice.

Installation and Operation Manual

Note: This manual incorporates data for the CDM-Qx and CDM-QxL.

Part Number MN/CDMQX.IOM Revision 5

Errata A

Comtech EF Data Documentation Update

Subject:

Date: Document:

Part Number: Collating Instructions:

Comments:

The following changes affects the acquisition rate specified in Section A.2.

Change Specifics:

Revised Acquisition Range for Demodulator

January 23, 2007 CDM-Qx, Multi-Channel Satellite Modem, Installation and Operation Manual, Revision 5, dated January 20, 2007 MN/CDMQx.EA5 Attach this page to page A-3

Acquisition range

±1 to ±32 kHz, Symbol rate > 64 ksps (70/140 MHz) ±1 to ± (Symbol rate/2) kHz , Symbol Rate <=64 ksps (70/140 MHz)

±1 to ±200 kHz, Symbol rate > 625 ksps (L-Band) ±1 to ± 32 kHz, 64 ksps < Symobol Rate <=625 ksps (L-Band) ±1 to ± (Symbol rate/2)kHz, Synbol Rate <=64ksps (L-Band)

Programmable in 1 kHz increments.

s:\tpubs\manuals\released_word\modems\cdmqx_rev5\text\errata a.doc

Errata B

Comtech EF Data Documentation Update

Subject:

Date: Document:

Part Number: Collating Instructions:

Comments:

Delete Combined Transmit Power menu.

Delete COMBINED TRANSMIT POWER Menu

January 23, 2007 CDM-Qx, Multi-Channel Satellite Modem, Installation and Operation Manual, Revision 5, dated January 20, 2007 MN/CDMQx.EB5 Attach this page to page 5-22

s:\tpubs\manuals\released_word\modems\cdmqx_rev5\text\errata b.doc

Errata C

Comtech EF Data Documentation Update

Subject:

Date: Document:

Part Number: Collating Instructions:

Comments:

Revised Sub-Menu for Vit+RS and TCM+RS to delete Viterbi and TPC.

Revise Sub-Menu for Vit+RS and TCM+RS

January 23, 2007 CDM-Qx, Multi-Channel Satellite Modem, Installation and Operation Manual, Revision 5, dated January 20, 2007 MN/CDMQx.EC5 Attach this page to page 5-25

If Vit+RS orTCM+RS is selected, the following sub-menu will be displayed:

Rx Rs (n/k): (◄ ►, ENT) IESS-310 network (219/201)

s:\tpubs\manuals\released_word\modems\cdmqx_rev5\text\errata c.doc

Errata D

Comtech EF Data Documentation Update

Subject:

Date: Document:

Part Number: Collating Instructions:

Comments:

Added requirements for IESS-310 mode to Tx menu.

Add Sub-Menu for Vit+RS and TCM+RS

January 23, 2007 CDM-Qx, Multi-Channel Satellite Modem, Installation and Operation Manual, Revision 5, dated January 20, 2007 MN/CDMQx.ED5 Attach this page to page 5-16

If Vit+RS orTCM+RS is selected, the following sub-menu will be displayed:

Tx Rs (n/k): (◄ ►, ENT) IESS-310 network (219/201)

s:\tpubs\manuals\released_word\modems\cdmqx_rev5\text\errata d.doc

CDM-Qx

Multi-Channel Satellite Modem with DoubleTalk™

Carrier-in-Carrier Installation and Operation Manual

Comtech EF Data is an ISO 9001

Registered Company

Note: This manual incorporates data for the CDM-Qx and CDM-QxL.

Part Number MN/CDMQx.IOM

Revision 5

January 20,2007

CDM-Qx Satellite Modem Revision 5 Preface MN/CDMQx.IOM

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

Contact Customer Support using any of the following methods:

Mail: Comtech EF Data

Email: service@comtechefdata.com

Customer Support Department

2114 West 7th Street

Tempe, Arizona 85281 USA

Phone: 480.333.2200 (Main Comtech EF Data Number)

480.333.4357 (Customer Support Desk)

Fax: 480.333.2161

Internet:

www.comtechefdata.com

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

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

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

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

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

CDM-Qx Satellite Modem Revision 5 Preface MN/CDMQx.IOM

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

1.1 Introduction................................................................................................................................ 1–1

1.2 Features....................................................................................................................................... 1–2

1.2.1 DoubleTalk™ Carrier-in-Carrier® ..................................................................................... 1–3

1.2.2 Software – Flash Upgrading................................................................................................ 1–3

1.2.3 Verification ......................................................................................................................... 1–3

1.2.4 Data Interfaces .................................................................................................................... 1–4

1.2.5 Turbo Product Coding.........................................................................................................1–4

1.2.6 Remote Control ...................................................................................................................1–4

1.3 Major Assemblies....................................................................................................................... 1–4

1.4 FAST Options and Hardware Options ....................................................................................1–5

1.4.1 FAST Accessible Options ...................................................................................................1–6

1.4.2 FAST System Theory.......................................................................................................... 1–6

1.4.3 Implementation ................................................................................................................... 1–6

1.4.4 Hardware Options ...............................................................................................................1–6

1.4.5 Supporting Hardware and Software (Future Feature) .........................................................1–7

1.5 L-Band ........................................................................................................................................1–7

1.6 Compatibility.............................................................................................................................. 1–7

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

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

2.2 Mounting.....................................................................................................................................2–2

2.3 Configuration ............................................................................................................................. 2–4

2.4 Select Internal IF Loop.............................................................................................................. 2–4

2.5 Connect External Cables........................................................................................................... 2–4

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CDM-Qx Satellite Modem Revision 5 Preface MN/CDMQx.IOM

CHAPTER 3. FUNCTIONAL DESCRIPTION .......................................................... 3–1

CHAPTER 4. EXTERNAL CONNECTIONS ............................................................ 4–1

4.1 Introduction................................................................................................................................ 4–1

4.2 Front Panel .................................................................................................................................4–2

4.3 Rear Panel ..................................................................................................................................4–3

4.4 Chassis Connections ..................................................................................................................4–5

4.4.1 USB Port .............................................................................................................................4–5

4.4.2 M&C 10/100BaseT Connector............................................................................................4–5

4.4.3 485/232 Connector ..............................................................................................................4–5

4.4.4 Alarms Connector ...............................................................................................................4–6

4.4.5 Balanced G.703 Connector Tx/Rx Connector..................................................................... 4–7

4.4.6 Unbalanced G.703 Tx/Rx Connectors ...............................................................................4–7

4.4.7 RS-530 Data Interface Connector ....................................................................................... 4–8

4.4.8 RX and TX IF Connectors ..................................................................................................4–9

4.4.9 Ref Connector .....................................................................................................................4–9

4.5 AC Power Connector................................................................................................................. 4–9

4.6 DC Power Connector................................................................................................................. 4–9

4.7 Ground Connector ................................................................................................................... 4–10

CHAPTER 5. FRONT PANEL OPERATION ........................................................... 5–1

5.1 Introduction...............................................................................................................................................5–1

5.2 Left-Hand Display Area............................................................................................................................5–4

5.2.1 Modems .............................................................................................................................................5–4

5.2.2 Redundancy .......................................................................................................................................5–5

5.2.3 Spectrum Analyzer ............................................................................................................................5–5

5.3 Right-Hand Display Area .........................................................................................................................5–6

5.4 Accessing the Display Area.......................................................................................................................5–6

5.5 Opening Screen..........................................................................................................................................5–8

CDM-Qx Satellite Modem Revision 5 Preface MN/CDMQx.IOM

5.6 TOP LEVEL SELECTION ......................................................................................................5–8

5.6.1 CONFIG.............................................................................................................................. 5–9

5.6.2 MONITOR ........................................................................................................................ 5–49

5.6.3 TEST: ................................................................................................................................5–56

5.6.4 INFO (Information)........................................................................................................... 5–61

5.6.5 SAVE/LOAD .................................................................................................................... 5–65

5.6.6 UTILITY ........................................................................................................................... 5–68

CHAPTER 6. FORWARD ERROR CORRECTION OPTIONS ................................ 6–1

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

6.2 Viterbi ......................................................................................................................................... 6–2

6.3 Reed-Solomon Outer Codec...................................................................................................... 6–3

6.4 Trellis Coding............................................................................................................................. 6–5

6.5 Turbo Product Codec (Hardware Option) .............................................................................. 6–6

6.5.1 Introduction......................................................................................................................... 6–6

6.5.2 The Evolution of TPC in Comtech Products....................................................................... 6–6

6.5.3 End-to-End Processing Delay .............................................................................................6–7

6.5.4 Comparison of all TPC Modes............................................................................................ 6–8

CHAPTER 7. EDMAC CHANNEL............................................................................ 7–1

7.1 Theory Of Operation .................................................................................................................7–1

7.2 M&C Connection....................................................................................................................... 7–2

7.3 Setup Summary.......................................................................................................................... 7–3

CHAPTER 8. AUTOMATIC UPLINK POWER CONTROL ......................................8–1

8.1 Introduction................................................................................................................................ 8–1

8.2 Setting AUPC Parameters......................................................................................................... 8–2

8.2.1 Target Eb/No....................................................................................................................... 8–2

8.2.2 Max Range .......................................................................................................................... 8–2

8.2.3 Alarm...................................................................................................................................8–3

8.2.4 Demod Unlock .................................................................................................................... 8–3

8.3 Compensation Rate.................................................................................................................... 8–3

8.4 Monitoring.................................................................................................................................. 8–4

CDM-Qx Satellite Modem Revision 5 Preface MN/CDMQx.IOM

CHAPTER 9. DOUBLETALK™ CARRIER-IN-CARRIER® OPERATION ............... 9–1

CHAPTER 10. REDUNDANCY.............................................................................. 10–1

CHAPTER 11. ETHERNET MANAGEMENT ......................................................... 11–1

11.1 Introduction................................................................................................................. 11–1

11.2 Ethernet Management Interface Protocols .............................................................. 11–1

11.3 Web Server (HTTP) Interface ................................................................................... 11–2

11.4 SNMP Interface........................................................................................................... 11–8

11.4.1 Management Information Base (MIB) Files......................................................... 11–8

11.4.2 SNMP Community Strings ................................................................................... 11–9

11.4.3 SNMP Traps.......................................................................................................... 11–9

11.5 Telnet Interface ......................................................................................................... 11–10

APPENDIX A. SUMMARY OF SPECIFICATIONS ................................................. A–1

APPENDIX B. FLASH UPGRADING...................................................................... B–1

APPENDIX C. REMOTE CONTROL........................................................................ C-1

APPENDIX D. CARRIER-IN-CARRIER® PERFORMANCE

CHARACTERIZATION ................................................................................... D–1

CDM-Qx Satellite Modem Revision 5 Preface MN/CDMQx.IOM

About this Manual

This manual provides installation and operation information for the Comtech EF Data CDM-Qx Multi-Channel Modem with DoubleTalk™ Carrier-in-Carrier®. This is a technical document intended for earth station engineers, technicians, and operators responsible for the operation and maintenance of the CDM-Qx.

CONVENTIONS AND REFERENCES

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.

CAUTIONS AND WARNINGS

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

CAUTION

indicate other unsafe practices or risks of property damage.

WARNING indicates a potentially hazardous situation

WARN ING

that, if not avoided, could result in death or serious injury.

Indicates information critical for proper equipment

IMPORTANT

function.

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 Technical Publications Department: techpub@comtechefdata.com

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CDM-Qx Satellite Modem Revision 5 Preface MN/CDMQx.IOM

ELECTRICAL SAFETY

The CDM-Qx Multi-Channel Modem with DoubleTalk™ Carrier-in-Carrier® 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 100 to 240 VAC. It has a maximum power consumption of 60 watts, and draws a maximum of 600 mA.

IMPORTANT

FUSES

The CDM-Qx is fitted with two fuses - one each for line and neutral connections. These are contained within the body of the IEC power inlet connector, behind a small plastic flap.

• For 115 and 230 VAC operation, use T1.25A, 20mm fuses.

FOR CONTINUED OPERATOR SAFETY, ALWAYS REPLACE THE FUSES WITH THE CORRECT TYPE AND RATING.

ENVIRONMENTAL

The CDM-Qx must 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 (unpressurized) greater than 2000 meters, 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.

The user should observe the following instructions:

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CDM-Qx Satellite Modem Revision 5 Preface MN/CDMQx.IOM

INSTALLATION

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

The CDM-Qx 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 CDM-Qx 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.

The modulator and demodulator cards shall not be plugged-in when the modem is powered on. Damage to the cards can be the result.

CAUTION

International Symbols:

Symbol Definition Symbol Definition

Alternating Current

Fuse

Protective Earth

Chassis Ground

CDM-Qx Satellite Modem Revision 5 Preface MN/CDMQx.IOM

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.

CE MARK

Comtech EF Data declares that the CDM-Qx meets the necessary requirements for the CE Mark.

TRADEMARKS

Carrier-in Carrier is a registered trademark of Comtech EF Data Corporation. DoubleTalk is a trademark of Applied Signal Technology, Inc.

CDM-Qx Satellite Modem Revision 5 Preface MN/CDMQx.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 the equipment or the information in this manual, contact the Comtech EF Data Customer Support Department.

CDM-Qx Satellite Modem Revision 5 Preface MN/CDMQx.IOM

Notes:

___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________ ___________________________________________

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Chapter 1. INTRODUCTION

1.1 Introduction

The CDM-Qx, Multi-Channel Satellite Modem with DoubleTalk™ Carrier-in-Carrier® is a 70/140 MHz (or CDM-QxL with 950MHz-1950MHz L Band operation) modular multichannel modem with redundancy contained in a single rack unit (1RU) chassis. The Modem offers flexibility, redundancy, integration, and performance with four slots configurable as modulators or demodulators.

The CDM-Qx/QxL supports DoubleTalk Carrier-in-Carrier® option, allowing transmit (Tx) and receive (Rx) carriers in a full-duplex link to use the same transponder segment.

Figure 1-1. CDM-Qx/QxL

1–1

CDM-Qx Satellite Modem Revision 5 Introduction MN/CDMQx.IOM

1.2 Features

The Modem includes such features as the following:

• DoubleTalk™ Carrier-in-Carrier® allowing Tx and Rx carriers of a full-duplex

link to use the same transponder segment

• CDM-Qx: 50 to 90 and 100 to 180 MHz frequency range

• CDM-QxL: 950 MHz-1950 MHz L-band

• 32 kbps to 20 Mbps

• BPSK, QPSK, 8-PSK, 16-QAM operation

• Flexible Configuration:

• 1 modem or 2 modems configured as 1:1

• Up to 4 demodulators

• Optional Built In Redundancy:

• 1:1 modem

• Up to 1:3 modulator

• Up to 1:3 demodulator

• EIA-422/-530, V.35, G.703 (E1/T1) and HSSI Interfaces

• 1 to 4 Ports of G.703 (E1 with D&I ) Quad E1 Interface Card

• 10/100 BaseT Ethernet, RS-232 or RS-485 for M&C remote control

• Forward Error Correction (FEC) choices included:

• Viterbi

• Viterbi with Reed-Solomon

• Trellis and Reed-Solomon

• Optional, 2

(IESS-315 compliant)

• Fully Accessible System Topology (FAST)

• Asymmetric Loop Timing

• Common frequency reference for all modules

• Optional High Stability Reference

• Optional Redundant Power Supply

• Individual or summed Modulator output power control

• Interoperable with: CDM-550T, -570L, -600, -600L, SDM-300A, -300L3, and

-8000 modems (in compatible modes)

• Drop and Insert, closed network version

• FSK, for communicating to Comtech EF Data transceivers

• EDMAC, Automatic Uplink Power Control

Generation Turbo Product Coding (TPC)

1–2

CDM-Qx Satellite Modem Revision 5 Introduction MN/CDMQx.IOM

1.2.1 DoubleTalk™ Carrier-in-Carrier®

Designed for bandwidth compression, Carrier-in-Carrier is based on Applied Signal Technology’s DoubleTalk which uses “Adaptive Cancellation,” a patented (Unites States Patent # 6,859,641) technology that allows full duplex satellite links to transmit concurrently in the same segment of transponder bandwidth. Available as an option to the modem, this added dimension can result in a significant improvement in satellite transponder utilization.

1.2.2 Software – Flash Upgrading

The internal software is both powerful and flexible, permitting storage and retrieval of up to 10 different modem configurations. The modem uses ‘flash memory’ technology internally, and new firmware can be uploaded to the unit from an external PC. This simplifies software upgrading, and updates can now be sent via the Internet, e-mail, or on disk. The upgrade can be performed without opening the unit by simply connecting the modem to the USB port or Ethernet port of a computer.

1.2.3 Verification

The Modem includes many test modes and loopbacks for rapid verification of the correct functioning of the unit. Of particular interest is the IF loopback, which permits the user to perform a quick diagnostic test without having to disturb external cabling. During loopback, all of the receive configuration parameters on the selected Demodulator are temporarily changed to match those of the selected Modulator, and an internal RF switch connects the modulator output to the demodulator input. When normal operation is again selected, all of the previous values are restored.

1–3

CDM-Qx Satellite Modem Revision 5 Introduction MN/CDMQx.IOM

1.2.4 Data Interfaces

The Modem can be ordered with a number of interfaces. Each data interface can operate on a Modulator or Demodulator. This allows the user to exchange interface cards for different applications. The interfaces offered include:

• EIA/TIA-530

• (EIA-422) DCE (at rates up to 12 Mbps)

• V.35 DCE (at rates up to 12 Mbps)

• G.703 Balanced T1 & E1 (DB-15) with D&I

• G.703 Unbalanced T1 & E1 (BNC)

• EIA/TIA-612/613 HSSI (50-pin SCSI connector, to 20 Mbps)

• 1 to 4 Ports of G.703 (E1 with D&I ) Quad E1 Interface Card, (DB-9F)

1.2.5 Turbo Product Coding

The Modem offers optional 2nd generation Turbo Product Codec (TPC). TPC simultaneously offers increased coding gain, lower decoding delay, and significant bandwidth savings. The TPC provides:

• BPSK 5/16 and 21/44

• QPSK 21/44, 3/4, 7/8 and 17/18

• 8-PSK 3/4, 7/8, and 17/18

• 16-QAM 3/4 and 7/8

1.2.6 Remote Control

The operator may configure and monitor the modem from the front panel, or through the remote M&C port. M&C is via RS-232, RS-485 (2/4 wire) or 10/100 BaseT Ethernet.

1–4

CDM-Qx Satellite Modem Revision 5 Introduction MN/CDMQx.IOM

1.3 Major Assemblies

Assembly Description

PL/10570-1 1 PPM Reference IF Backplane 70/140 MHz IF PL/10570-2 0.1 PPM Reference IF Backplane 70/140 MHz IF PL/10070-1 0.1 PPM Reference IF Backplane L-Band IF PL/10069 Digital Backplane PL/10073 Monitor and Control Card PL/11128 70/140 MHz IF Modulator PL/10635 70/140 MHz IF Demodulator with Carrier in Carrier PL/10071 L-Band IF Modulator PL/10072 AS/11014 Turbo Codec – Simplex PL/10678 EIA-530 Duplex Data interface PL/10697 G.703 Balanced Duplex Data Interface PL/10698 G.703 Unbalanced Duplex Data Interface PL/12608-1 Quad E1 G.703 Data Interface Module PL/10898-1 EIA-612/613 HSSI Interface PL/10416-1 AC Chassis, 70/140 IF PL/10416-2 DC Chassis, 70/140 IF PL/12798-1 AC Chassis, L-Band PL/12798-2 DC Chassis, L-Band

L-Band IF Demodulator with Carrier in Carrier®

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CDM-Qx Satellite Modem Revision 5 Introduction MN/CDMQx.IOM

1.4 FAST Options and Hardware Options

The Modem is extremely flexible and powerful, and incorporates a large number of optional features. Some customers may not require all of these features, and therefore, in order to permit a lower initial cost, the Modem may be purchased with only the desired modules and features enabled. If, at a later date, a customer wishes to upgrade the functionality of a modulator or demodulator, Comtech EF Data provides a system known as FAST (Fully Accessible System Topology) which permits the purchase and installation of options through the use of special authorization codes, entered through the front panel, or remotely.

The base configuration of the modulators and demodulators are equipped with Viterbi and R-S codecs. It offers modulation types, and data rates up to 5 Mbps. It is, however, limited to Closed Network operation.

The following table shows what other options are available:

Modulator & Demodulator Options

Low Rate Variable Data rate 32 kbps to 5 Mbps Base Unit Mid-Rate Variable Data rate 32 kbps to 10.0 Mbps FAST Full Rate Variable Data rate 32 kbps to 20.0 Mbps FAST 8-PSK Modulation Type FAST 16-QAM Modulation Type FAST DoubleTalk Carrier-in-Carrier 128 ksps – 512 kbps FAST DoubleTalk Carrier-in-Carrier 128 ksps – 1 Mbps FAST DoubleTalk Carrier-in-Carrier 128 ksps – 2.5 Mbps FAST DoubleTalk Carrier-in-Carrier 128 ksps – 5 Mbps FAST DoubleTalk Carrier-in-Carrier 128 ksps – 1.0 Mbps FAST

DoubleTalk Carrier-in-Carrier 128 ksps – 20 Mbps FAST Redundancy Capability 1:1 or 1:2 or 1:3 Redundancy FAST Turbo Codec – high rate 20 Mbps Turbo Codec Hardware High Stability Reference Internal 10 MHz reference – 0.1 x 10-6 Hardware* Low Stability Reference Internal 10 MHz reference – 1 x 10-6 Hardware* 75Ω TX/RX Impedance 75Ω impedance with BNC female connectors 50Ω TX/RX Impedance 50Ω impedance with N female connectors (L-

Description and Comments

Band)

*Factory installed only.

Option Installation

Method

Hardware* Hardware*

1–6

CDM-Qx Satellite Modem Revision 5 Introduction MN/CDMQx.IOM

1.4.1 FAST Accessible Options

Comtech EF Data’s FAST system allows immediate implementation of different options through the user interface keypad. All FAST options are available through the basic platform unit.

1.4.2 FAST System Theory

FAST is an enhancement feature available in Comtech EF Data products, enabling onlocation upgrade of the operating feature set - in the rack - without removing a modem from the setup. When service requirements change, the operator can upgrade the topology of the modem to meet those requirements within minutes after confirmation by Comtech EF Data. This accelerated upgrade can be accomplished only because of FAST’s extensive use of programmable devices incorporating Comtech EF Data-proprietary signal processing techniques. These techniques allow the use of a unique access code to enable configuration of the available hardware. The access code can be purchased at any time from Comtech EF Data. Once obtained, the access code is loaded into the unit through the front panel keyboard or the rear remote port.

With the exclusive FAST technology, operators have maximum flexibility for enabling functions as they are required. FAST allows an operator to order a modem precisely tailored for the initial application.

1.4.3 Implementation

FAST is factory-implemented in the modem at the time of order. Hardware options for basic modems can be ordered and installed either at the factory or in the field. The operator can select options that can be activated easily in the field, depending on the current hardware configuration of the product. The Activation Procedure is described in Appendix C.

1.4.4 Hardware Options

There are four hardware options available.

There is the Comtech EF Data Turbo Product Codec (TPC), representing a very significant development in the area of FEC. It consists of a plug-in daughter card (SIMM module) that is field upgradeable. The TPC option provides data rate capability up to 20 Mbps, and code rates of:

• Rate 5/16 (BPSK)

• Rate 21/44 (BPSK, QPSK)

• Rate 3/4 (QPSK, 8-PSK, and 16-QAM)

• Rate 7/8 (QPSK, 8-PSK, and 16-QAM)

• Rate 17/18 (QPSK, 8-PSK)

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Turbo Product Coding provides one of the best Forward Error Correction technologies currently available, and is now offered with a sufficient range of code rates and modulation types to optimize link performance under any conditions.

The second hardware option is the Internal Reference Stability. The high stability option includes a 1 x 10 stability option has a 1 x 10

-7

10 MHz reference oscillator on the IF Backplane board, while the low

-6

10 MHz reference on the IF Backplane board. This option

must be configured in the factory at the time of order.

The third hardware option is the IF Impedance and Connectors. The IF may be configured with either BNC female connectors at 75Ω impedance, BNC female connectors at 50Ω impedance, or TNC female connectors at 50Ω impedance. This option also must be configured in the factory at the time of order.

The fourth hardware option is the Quad E1 Data Interface Module. This gives the user 1 to 4 ports of E1, (each are D&I capable). These ports must use a synchronous E1 reference. This option also must be configured in the factory at the time of order.

1.4.5 Supporting Hardware and Software

The Modem incorporates an FSK serial link that can be activated on the RX-IF port for purpose of communicating with an FSK capable Transceiver. In this manner, a user may monitor, configure, and control the transceiver using the front panel display and keypad of the modem or the modem’s remote control interface. The EDMAC channel can be used to convey M&C interface to a transceiver at the distant end of a satellite link if it is connected to a modem.

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CDM-Qx Satellite Modem Revision 5 Introduction MN/CDMQx.IOM

1.5 L-Band

Fully configured, the modem will meet or exceed all of the applicable requirements in IESS-315 and is available with a full range of industry standard digital interfaces. The modem expands the capabilities into L-Band frequencies. Utilizing advanced technology and proprietary digital signal processing techniques, the design eliminates analog circuitry to perform modem signal processing, resulting in higher reliability and reduced packaging size.

1.6 Compatibility

The Modem is backwards compatible with a number of Comtech EF Data CDM modems, SDM modems, and

SLM modems.

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Notes:

_______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________

1–10

Chapter 2. INSTALLATION

2.1 Unpacking

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

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 the following sections for further installation instructions.

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CDM-Qx Satellite Modem Revision 5 Installation MN/CDMQx.IOM

2.2 Mounting

If the modem is to be mounted in a rack, ensure that there is adequate clearance for ventilation, particularly at the sides. In rack systems where there is high heat dissipation, forced air-cooling must be provided by top or bottom mounted fans or blowers. Under no circumstance should the highest internal rack temperature be allowed to exceed 50°C (122°F).

2.2.1 Optional Rear-Mounting Installation Bracket

Install optional installation brackets (Figure 2-1) using mounting kit KT/6228-2:

Mounting Kit KT/6228-2 (Optional)

Quantity Part Number Description

2 HW/10-32SHLDR Screw, #10 Shoulder 4 HW/10-32FLT Washer, #10 Flat 2 HW/10-32SPLIT Washer, #10 Split 2 HW/10-32HEXNUT Nut, #10 Hex 2 FP/6138-1 Bracket, Rear Support 4 HW/10-32x1/2RK Bolt, #10 Rack Bracket

The tools required for this installation are a medium Phillips™ screwdriver and a 5/32-inch SAE Allen™ Wrench.

The CDM-QD is assembled into the equipment rack as shown in Figure 2-1:

Step Procedure

Secure the #10 shoulder screws to the unit chassis through the rear

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right and left side mounting slots, using the #10 flat washers, #10 split washers, and #10 hex nuts as shown.

Install the rear support brackets onto the equipment rack threaded rear mounting rails, using the #10 bracket bolts.

Mount the unit into the equipment rack, ensuring that the shoulders of the #10 shoulder screws properly engage into the rear support bracket slots.

CDM-Qx Satellite Modem Revision 5 Installation MN/CDMQx.IOM

Equipment Rack Rear Mounting Rail

#10 Shoulder Screw

Support Bracket

#10 Bracket Bolt

#10 Flat Washer

Figure 2-1. Installation of the Optional Mounting Brackets

#10 Split Washer

#10 Hex Nut

Back of unit

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2.3 Configuration

There are no internal jumpers to configure. All configuration is carried out entirely in software. The unit should first be configured locally, using the front panel keypad and display. The unit will ship with a default Viterbi 128 kbps, QPSK, Rate 3/4 configuration. Refer to the ‘FRONT PANEL OPERATION’ chapter for details on how to fully configure the unit for the desired operating parameters.

Note: The auto-sensing AC power supply does not require any adjustments. Simply plug in the supplied line cord, and turn on the switch on the rear panel.

2.4 Select Internal IF Loop

Correct operation of the unit may be verified rapidly, without the need for externally connected equipment, providing there are at least one modulator and one demodulator. From the top-level menu, select CONFIG, then GROUP, then MODEM. This will require a modulator to be above a demodulator in the chassis. Then go back to the toplevel menu; select TEST, then IF LOOP (refer to the ‘FRONT PANEL OPERATION’ chapter). The demod should synchronize, and the green RECEIVE TRAFFIC LED should illuminate. If the unit does not pass this test, call the factory for assistance.

2.5 Connect External Cables

Having verified correct operation in IF loop, enter the desired configuration, and proceed to connect all external cables. If difficulties occur, please call the factory for assistance.

Observe the following:

• If modulators and demodulators are to be used without grouping them as a

modem, a data interface cable is required to plug into each unit. If a modulator and demodulator are grouped as a modem, the modulator must be located above the demodulator and a single data interface cable is used simply by connecting it to the demodulator.

• If a modulator, demodulator, or grouped (modem) is defined as a back up unit, a

data interface cable is not required to the unit or units.

Note: Each modulator has an output power level in the range -5 to -25 dBm (-5 to -45 dBm for L-Band). Even though there is a single IF output connector and a single IF input connector, all four slots are hooked up by way of internal power splitters and summers. If two modulators are turned on, the total power out will be 3 dB higher (assuming both modulators are set to the same power level). If four modulators are turned on, the total power out will be 6 dB higher (assuming all modulators are set to the same power level).

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Chapter 3. FUNCTIONAL

DESCRIPTION

The modem has two fundamentally different types of interface: IF and Data.

• The Data interface can be a bi-directional path, which connects with the

customer’s equipment (assumed to be the DTE) and the modem (assumed to be the DCE).

• The IF interface provides a bi-directional link with the satellite via the uplink and

downlink equipment.

Transmit data is received by the terrestrial interface where line receivers convert the clock and data signals to CMOS levels for further processing. A small FIFO follows the terrestrial interface to facilitate the various clocking and framing options. If framing is enabled, the transmit clock and data output from the FIFO pass through the framer, where the overhead EDMAC data is added to the main data. Otherwise, the clock and data are passed directly to the Forward Error Correction encoder. In the FEC encoder, the data is scrambled, differentially encoded, and then convolutionally encoded. Following the encoder, the data is fed to the transmit digital filters, which perform spectral shaping on the data signals. The resultant I and Q signals are then fed to the BPSK/QPSK/ 8-PSK/16-QAM modulator. The carrier is generated by a frequency synthesizer, and the I and Q signals directly modulate this carrier to produce an IF output signal.

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The RX IF signal is translated and filtered at an intermediate frequency (IF) using the coarse step synthesizer. This is mixed with a second synthesizer, resulting in the signal being IF sampled with a high-speed analog to digital converter (A to D). The sampled IF is then digitally split into an in-phase (I) and a quadrature (Q) component. An AGC circuit keeps the desired signal level constant over a broad range of input levels. The I and Q signals are then decimated to reduce the computation rate into the poly phase matched filter. Carrier and clock recovery is performed on the baseband I and Q signals after the matched filter. The resultant demodulated signal is fed, in soft decision form, to the selected FEC decoder (which can be Viterbi, TCM, Reed-Solomon, or Turbo if installed). After decoding, the recovered clock and data pass to the de-framer (if EDMAC framing is enabled) where the overhead information is removed. Following this, the data passes to the Plesiochronous/Doppler buffer, which has a programmable size, or alternatively bypasses the buffer. From here, the receive clock and data signals are routed to the terrestrial interface, and are passed to the externally connected DTE equipment.

Physically a modem chassis is comprised of three main card assemblies:

1. The first of these is the IF Backplane card, which includes the frequency

reference; power splitters, power summers, the FSK link and the IF Loop back functions.

2. The second card is the Digital Back plane card. This routes all the control

signals, the data path switching, the carrier-in-carrier signals and power for all modules.

3. The third is the M&C, which controls all functions in the unit.

Within the chassis are four slots, which allow any combination of modulators or demodulators to be installed. If configured as a single modem, two plug-in cards comprising a modulator and demodulator are required.

A Modulator card contains the transmit interface circuits, the framer, the encoder or encoders and the signal processing functions of modulation.

A Demodulator card performs all of the signal processing functions of carrier search, cancellation, demodulation, Forward Error Correction, the de-framer, plesiochronous/Doppler buffer and the receive interface circuits.

Terrestrial data interface cards can be on the modulator cards or demodulator cards. When a modulator and demodulator are grouped together, the data interface card can be used for full-duplex data interface. When 1 up to 4 ports of E1 (with D&I) are needed the Quad E1 Data Interface Module can be installed in slots 3 and 4.

Figure 3-1 shows a functional block diagram of the modem with either modulators and demodulators in all 4 slots and the figure also shows a modulator in slot 1 and a demodulator in slot 2 along with a Quad E1 Data Interface Module in slot 3 and 4.

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CDM-Qx Satellite Modem Revision 5 Functional Description MN/CDMQx.IOM

Figure 3-1. Modem Block Diagram

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Notes:

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Chapter 4. EXTERNAL

4.1 Introduction

The modem is constructed as a 1RU high rack-mounting chassis, which can be freestanding, if desired. Rack handles at the front facilitate removal from and placement into a rack. Figure 4-1 shows the front panel of the modem.

CONNECTIONS

Figure 4-1. Front Panel

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4.2 Front Panel

LED Keypad Display (VFD) Indicators

The Modem front panel features a Vacuum Fluorescent Display (VFD), a keypad, and eight LED indicators. The user enters data via the keypad, and messages are displayed on the VFD. The LEDs indicate, in a summary fashion, the status of the selected module.

The VFD is an active display showing 2 lines, each of 40 characters. It produces a blue light, the brightness of which can be controlled by the user. It has greatly superior viewing characteristics compared to a Liquid Crystal Display (LCD), and does not suffer problems with viewing angle, contrast or temperature.

The keypad has six individual keyswitches, mounted directly behind a fully sealed membrane overlay. They have a positive ‘click’ action, which provides the user with tactile feedback. These six switches are identified as [↑], [↓], [→], [←] arrows, ENT and

CLR. The functions of these keys are described in the ‘FRONT PANEL OPERATION’ section.

There are eight LEDs on the front panel. The behavior of these LEDs is described in the ‘FRONT PANEL OPERATION’ section.

IMPORTANT

A USB Slave connector is provided on the front panel. This feature allows the user to reflash firmware.

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4.3 Rear Panel

The rear panel can be customized to meet the customer’s requirements. Figure 4-2 shows three configurations that are available. Table 4-1 lists these connectors and Figure 4-2 shows the locations.

Figure 4-2. Rear Panel

Slot 1 Slot 2

Configuration #1 Modem 1 with G.703 T1/E1 Balanced (DB-15) Modem 2 with EIA-422 (DB-25)

Configuration #2 Modem 1 with G.703 T1/E1 Unbalanced (BNC) Modem 2 with EIA-422 (DB-25)

Slot 3 Slot 4

IF I/OPrime Power & Control

Configuration #3 Modem 1 with G.703 T1/E1 Balanced (DB-15) and Quad E1 Interface Module, 1-4 Ports of E1,with D&I (2) DB-9F)

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Notes:

1. One interface per Modem (i.e. Modulator and Demodulator card combination) or one interface per Modulator card and Demodulator card are required if used independently.

2. When grouping a modulator and demodulator together to use as a modem, the modulator must be located above the demodulator.

3. For redundant operation the backup unit does not need an interface.

4. For redundant operation the backup unit needs to be located in the lower right hand slot (#4) for single module redundancy. For modem redundancy the backup units must be located in the right hand slots (#3 & #4).

5. In the example Configuration #1 above, because all modules have interfaces, the following configurations are possible.

a. Two independent modulators - one with a G.703 balanced and the other with an EIA-530

interface, with two independent demodulators one with a G.703 balanced and the other with an EIA-530 interface.

b. Two independent modems - one with a G.703 balanced and the other with an EIA-530

interface (located on the demodulators).

c. A 1:1 redundant modem, with the online unit configured with a G.703 interface. The off

line modules will provide the backup even with a different interface.

6. In the example Configuration #3 above, the Quad E1 Interface Module is used in slot 3 and 4. The modulator in slot 1 is grouped with the demoduletor in slot 2. This unique combinations allows the user to select the Quad E1 interface or the data interface located in the modulator or demodulator.

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Table 4-1. Modem Rear Panel Connectors

Name Ref. Desig. Connector Type Function Configuration #1 - Modem1 with G.703 T1/E1 Balanced (DB-15) Modem2 with EIA-422 (DB-25)

M&C 10/100BaseT RJ-45 Remote Interface 485/232 9-Pin D Male Remote Interface Slot #1 Mod: Alarms 15-Pin Male Form-C Alarms G.703 15-Pin Female Balanced G.703 Data Input Slot #2 Demod: Alarms 15-Pin Male Form-C Alarms G.703 15-Pin Female Balanced G.703 Data Output, or Input/Output Slot #3 Mod: Alarms 15-Pin Male Form-C Alarms EIA-530 25-Pin Female Data Input Slot #4 Demod: Alarms 15-Pin Male Form-C Alarms EIA-530 25-Pin Female Data Output, or Input/Output 70/140 Tx /Rx:

Tx BNC

Rx BNC

Ref BNC External Reference for Modem Synthesizers AC Plug IEC Modem Power Ground #10-32 Stud Grounding Configuration #2 - Modem 1 with G.703 EIA-422(DB-25) Modem2 with G.703 T1/E1 Unbalanced (BNC) M&C 10/100BaseT RJ-45 Remote Interface 485/232 9-Pin D Male Remote Interface Slot #1 Mod: Alarms 15-Pin Male Form-C Alarms G.703 BNC Unbalanced G.703 Data Output (incorrect slot for IO) Slot #2 Demod: Alarms 15-Pin Male Form-C Alarms G.703 BNC Unbalanced G.703 Data input Slot #3 Mod: Alarms 15-Pin Male Form-C Alarms EIA-530 25-Pin Female Data Input Slot #4 Demod: Alarms 15-Pin Male Form-C Alarms EIA-530 25-Pin Female Data Output, or Input/Output 70/140 Tx /Rx:

Tx BNC

Rx BNC

Ref BNC External Reference for Modem Synthesizers AC Plug IEC Modem Power Ground #10-32 Stud Grounding

RF Output 75 or 50Ω RF Input 75 or 50Ω

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Name Ref. Desig. Connector Type Function

Configuration #3 - Modem 1 with G.703 T1/E1 Balanced (DB-15) and Quad E1IInterface (1-4 Ports E1,w/ D&I) M&C 10/100BaseT RJ-45 Remote Interface 485/232 9-Pin D Male Remote Interface Slot #1 Mod: Alarms 15-Pin Male Form-C Alarms G.703 BNC Unbalanced G.703 Data Output (incorrect slot for IO) Slot #2 Demod: Alarms 15-Pin Male Form-C Alarms G.703 BNC Unbalanced G.703 Data input Slot #3 and #4 Quad E1: Ports 1-2 of E1 DB-9 Female Balance E1 (with D&I) Ports 3-4 of E1 DB-9 Female Balance E1 (with D&I) Ext Ref E1 Clock DB-9 Female Balance E1 clock input and output 70/140 Tx /Rx:

Tx BNC

Rx BNC

Ref BNC External Reference for Modem Synthesizers AC Plug IEC Modem Power Ground #10-32 Stud Grounding

RF Output 75 or 50Ω RF Input 75 or 50Ω

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Note: The European EMC Directive (EN55022, EN50082-1) requires using properly shielded cables for DATA I/O.

4.4 Chassis Connections

4.4.1 USB Port

This port is used to reflash firmware.

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

IMPORTANT

rating.

4.4.2 M&C 10/100BaseT Connector

The M&C 10/100BaseT connector is an 8-pin RJ-45 10/100BaseT Ethernet port providing access to the modem’s management functions.

4.4.3 485/232 Connector

The 485/232 connectors are a 9-pin 'D' type male (DB9-M). Access is provided to remote control ports of the modem, using both RS-232 and RS-485.

Table 4-2. Remote Control Interface Connector Pin Assignments

Pin # Description Direction

1 Ground 2 RS-232 TX Data Out 3 RS-232 RX Data In 4 Reserved - do not connect to this pin 5 Ground 6 RS-485 RX Data B * In 7 RS-485 RX Data A * In 8 RS-485 TX Data B Out 9 RS-485 TX Data A Out

*Use for 2-wire RS-485 operation

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4.4.4 Alarms Connector

All modules contain an alarm connector. The Alarms connector is a 15-pin 'D' type male (DB15 M). This provides the user with access to the Form-C relay contacts, which indicate the fault status of the unit. These are typically connected to an external fault monitoring system, often found in satellite earth stations.

For a Modulator, TX fault and Unit Fault are supported. The transmit I and Q modulator samples are available on this connector. Connecting these signals to an oscilloscope in X,Y mode will provide the modulator signal constellation diagram, which is a useful diagnostic aid. A pin also is provided which can mute the transmit carrier. This requires that the pin be shorted to ground, or a TTL ‘low’.

For a Demodulator, RX fault and Unit Fault are supported. If a Modulator and Demodulator are vertically grouped together as a modem, TX fault and the External carrier off pin will also be supported. The receive I and Q demodulator samples are provided on this connector. Connecting these signals to an oscilloscope in X,Y mode will provide the receive signal constellation diagram, which is a useful diagnostic aid. As an aid to antenna pointing, or for driving step-track equipment, an analog AGC signal is provided on Pin 2 of this connector.

Table 4-3. Alarm Interface Connector Pin Assignments

Pin # Signal Function Name

10 No Connection N/C

1 Ground GND

RX Traffic (De-energized, Faulted) RX Traffic (Energized, No Fault) RX Traffic TX Traffic (De-energized, Faulted) TX Traffic (Energized, No Fault) TX Traffic Unit Fault (De-energized, Faulted) Unit Fault (Energized, No Fault) Unit Fault I Channel (Constellation monitor) Q Channel (Constellation monitor)

AGC Voltage (Rx signal level, 0 to 2.5 volts, demodulator only)

EXT Carrier OFF (modulator or modulator and demodulator grouped together)

RX-NC RX-NO RX-COM TX-NC TX-NO TX-COM UNIT-NC UNIT-NO UNIT-COM TX or RX-I TX or RX-Q

AGC

EXT-OFF

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4.4.5 Balanced G.703 Connector Tx/Rx Connector

The Balanced G.703 connection is a 15-pin female connector located on the rear mounting plate of the modulator or demodulator. If a Modulator and Demodulator are vertically grouped together as a modem, the data interface connector on the Demodulator switches to duplex. This feature allows a single data interface connection to be used for a modem instead of needing a “Y” cable. Otherwise, each module is a simplex data interface. Refer to Table 4-4 for pin assignments.

Table 4-4. Balanced G.703 Interface Connector Pin Assignments

Pin # Signal Function Name Direction

1 Drop Data Input ( - ) DDI– In 9 Drop Data Input (+) DDI+ In 2 Ground GND

10 Not Used

3 Insert Data Output ( - ) IDO– Out

11 Insert Data Output (+) IDO+ Out

4 Ground GND

12 Drop Data Output ( - ) DDO– Out (D&I Only)

5 Drop Data Output (+) DDO+ Out (D&I Only)

13 Insert Data Input ( - ) IDI– In (D&I Only)

6 Insert Data Input (+) IDI+ In (D&I Only)

14 Not Used

7 Not Used

15 Not Used

8 Not Used

4.4.6 Unbalanced G.703 Tx/Rx Connectors

Two female BNC 75Ω connectors are available for unbalanced operation at the G.703 data rates of T1 (1.544 Mbps) and E1 (2.048 Mbps). If a Modulator and Demodulator are vertically grouped together as a modem, the Tx data input interface connector on the Demodulator becomes active, allowing duplex operation. Otherwise, the Tx data input connector is used on the modulator and the Rx data output connector is used on the demodulator.

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4.4.7 RS-530 Data Interface Connector

The Data connector is a 25-pin ‘D’ type female (DB-25F). This connector conforms to the RS-530 pinout, which allows for connection of different electrical standards, including EIA-422, V.35, and EIA-232.

All data interfaces are duplex! They will only operate as duplex if a Modulator and Demodulator are vertically grouped together as a modem. In that case the data interface connector on the Demodulator switches to duplex. This feature allows a single data interface connection to be used for a modem

IMPORTANT

instead of needing a “Y” cable. Otherwise, the data interface for each module will only operate as simplex. It is the responsibility of the user to provide the appropriate cables to connect to this RS-530 connector.

Table 4-5. RS-530 Data Interface Connector Pin Assignments

Pin #

2 TX Data A DTE to Modem SD A SD A BA 103 14 TX Data B DTE to Modem SD B SD B - 103 24 TX Clock A DTE to Modem TT A SCTE A DA 113 11 TX Clock B DTE to Modem TT B SCTE B - 113 15 INT TX Clock A Modem to DTE ST A SCT A DB 114 12 INT TX Clock B Modem to DTE ST B SCT B - 114

3 RX Data A Modem to DTE RD A RD A BB 104 16 RX Data B Modem to DTE RD B RD B - 104 17 RX Clock A Modem to DTE RT A SCR A DD 115

9 RX Clock B Modem to DTE RT B SCR B - 115

8 Receiver Ready A Modem to DTE RR A RLSD * CF 109 10 Receiver Ready B Modem to DTE RR B - - 109

7 Signal Ground - SG SG AB 102

1 Shield - Shield FG AN 101

Generic Signal

Description

External Carrier Off (RS-232 ‘1' or TTL ‘low’ )

Direction

DTE to Modem - - - -

RS-422

RS- 530

LVDS

V.35 RS-232 Circuit #

Notes:

1. Receiver Ready is an RS-232 -level control signal on a V.35 interface

2. DO NOT connect signals to pins which are not shown - these pins are reserved for use by the redundancy system

3. ‘B’ signal lines are not used for RS-232 applications

4. For X.21 operation, use the EIA-422 pins, but ignore RX Clock if the Modem is DTE, and ignore TX clocks if

the Modem is DCE.

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4.4.8 Quad E1 Data Interface Connectors

The (2) Data connectors on the Quad E1 interface card are 9-pin ‘D’ type female (DB9F). Refer to Table 4-xx for pin assignments. J1 and J2 are shown below. Also available is an adapter y-cable to adapt the DB9 to (2) RJ45 jacks, (part number PL/xxxTBD), see Table xx and figure xx.

Table 4-xx6. Quad E1 Data Interface J1 Connector Pin Assignments

Pin # Signal Function Name Direction

5 DDI (+) Port1_Tx+ In 9 DDI (-) Port1_Tx– In 4 IDO (+) Port1_Rx+ Out 8 IDO (-) Port1_Rx– Out 3 Ground Gnd 7 DDI (+) Port2_Tx+ In 2 DDI (-) Port2_Tx– In 6 IDO (+) Port2_Rx+ Out 1 IDO (-) Port2_Rx– Out

Table 4-xx7. Quad E1 Data Interface J2 Connector Pin Assignments

Pin # Signal Function Name Direction

5 DDI (+) Port3_Tx+ In 9 DDI (-) Port3_Tx– In 4 IDO (+) Port3_Rx+ Out 8 IDO (-) Port3_Rx– Out 3 Ground Gnd 7 DDI (+) Port4_Tx+ In 2 DDI (-) Port4_Tx– In 6 IDO (+) Port4 Rx+ Out 1 IDO (-) Port4_Rx– Out

Table 4-xx8. Ext Ref Clock Interface J3 Connector Pin Assignments

Pin # Signal Function Name Direction

5 E1 Ref Clock In (+) Ref_Clk_In (+) In 9 E1 Ref Clock In (-) Ref_Clk_In (+) In 4 Not used -- -8 Not used -- -3 Ground Gnd 7 Not used -- -2 Not used -- -6 E1 Ref Clock Out (+) Ref_Clk_Out (+) Out 1 E1 Ref Clock Out (-) Ref_Clk_Out (+) Out

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4.4.9 RX and TX IF Connectors

The IF connectors will depend on the configuration ordered. The following reflects configurations available. BNC 75Ω is standard for 70/140MHz IF, N-Type 50Ω for LBand, and BNC Ref Connector. This 50Ω BNC female connector provides an external reference input for the Tx and Rx IF synthesizers, and for the internal transmit clock. The load impedance is 60.4Ω, so the VSWR is less than 1.25:1 at either 50Ω or 75Ω. Input level is 0 dBm minimum to +20 dBm maximum at either 1, 2, 5, 10, or 20 MHz. When external reference is enabled, the internal 10 MHz reference oscillator is phase locked to the external reference input by a 10Hz bandwidth PLL. If no activity is present at the external reference input, the modem will revert to the internal 10 MHz reference.

4.5 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:

AC Power Specifications

Input Power 290W maximum, 57W typical without BUC power supply. Input Voltage 100 - 240 volts AC, +6%/-10% - autosensing

(total absolute max. range is 90 to 254 VAC) Connector Type IEC Fuse Protection 3.15A Slow-blow

Line and neutral fusing

20 mm type fuses

4.6 DC Power Connector

A standard, 3-screw terminal block supplies the Direct Current (DC) power to the modem. Observe the following:

AC Power Specifications

Input Power 290W maximum, 57W typical without BUC power supply. Input Voltage 36 to 72 VDC; 6.25 amps Connector Type Terminal Block Fuse Protection 3.15A Slow-blow

20 mm type fuses

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4.7 Ground Connector

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

Note: The AC power connector provides the safety ground.

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Chapter 5. FRONT PANEL

5.1 Introduction

OPERATION

Figure 5-1. Front Panel Display

The user can fully control and monitor the operation of the Modem from the front panel (Figure 5-1), using the keypad and display. Nested menus are used, which display all available options, and prompt the user to carry out a required action.

The display has two lines of 40 characters each. The display is divided into two areas.

• The left hand area briefly describes the contents of the four plug-in slots and

indicates which slot is currently being addressed. To navigate between sides is as simple as selecting a slot if the curser is on the left side and being in the root menu on the left side and arrowing to the left.

• The right hand side accesses the addressed plug-in device. To group a modulator

and demodulator together requires the modulator to be located above the demodulator, one of the two modules needs to be selected in the left side of the screen, return to the right side of the screen go to Config, Group, Modem, and select Group.

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On most menu screens, the user will observe a flashing solid block cursor, which blinks at a once-per-second rate. This indicates the currently selected item, digit, or field. Where this solid block cursor would obscure the item being edited (for example, a numeric field) the cursor will automatically change to an underline cursor.

If the user were to display the same screen for weeks at a time, the display could become ‘burnt’ with this image. To prevent this, the unit has a ‘screen saver’ feature that will activate after 1 hour. The top line of the display will show the Circuit ID (which can be entered by the user) and the bottom line will show the circuit Eb/No value (if there is a

demod and it is locked) followed by ‘Press any key....’. The message moves from right to

left across the screen, then wraps around. If there are multiple circuits, their messages and Eb/No’s will be displayed sequentially. Pressing any key will restore the previous screen. The behavior of the front panel LEDs is described below in Table 5-1.

Table 5-1. Front Panel LED Indicators

LED Color Condition

Unit Status

Transmit Traffic

Receive Traffic

Online

Stored Event

Remote

EDMAC Mode

Test Mode

Red A Unit Fault exists (Example: PSU fault) Green No Unit Faults Note: Unit fault does not include Tx or Rx fault. Green No Tx Traffic Faults Off A Tx Traffic fault exists or the Tx Carrier is in OFF state Note: This LED corresponds to the selected slot, example <TX>. Green No Rx Traffic Faults (demod and Viterbi decoder are locked, everything is OK)

Off

Note: This LED corresponds to the selected slot, example <RX>. Green The Unit is On Line, and carrying traffic

Off

Note: This LED corresponds to the selected slot, example <RX>.

Orange

Off There are no Stored Events Orange The Unit is in Remote Mode - local monitoring is possible, but no local control Off The Unit is in Local Mode - remote monitoring is possible, but no remote control Flashing ODU FSK control has been enabled, and there is a communications fault.

Orange

Off

Orange

Off

An Rx Traffic fault exists (the demod may still be OK – check the fault status of the unit from the Monitor menu).

The Unit is Off Line (standby) - forced by externally connected 1:1 or 1:N redundancy system

There is a Stored Event in the log, which can be viewed from the front panel, or retrieved via the remote control interface

Framing on, EDMAC on, and unit defined as Slave - local monitoring is possible, but no local control

Either the unit is in Transparent mode (no framing), or the framing has been selected, but in AUPC-only mode, or EDMAC Master configuration.

A Test Mode is selected (example: IF Loopback), or BERT Generator is turned on, or BERT Monitor is turned on, or Spectrum Analyzer is turned on.

There is no Test Mode currently selected, BERT Generator is off, BERT Monitor is off, and spectrum Analyzer is off.

In general, the Alarm relay state will reflect the state of the Front Panel LEDs. For instance, if the Unit Status LED is red, the Unit Alarm relay will be active, etc. The one exception is the Transmit Traffic relay. This will only be activated if a Transmit Traffic Fault exists – it does not

IMPORTANT

5–2

reflect the state of the TX carrier.

CDM-Qx Satellite Modem Revision 5 Front Panel Operation MN/CDMQx.IOM

The keypad is shown in Figure 5-2:

Diamond Keypad (Presently used on all Units) Button Keypad (New Configuration for Units)

Figure 5-2. Keypad

The function of these keys is as follows:

IMPORTANT

ENT (Enter)

CLR (Clear)

← → (Left, Right)

↑ ↓ (Up, Down)

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 ENT. Pressing CLR generally returns the display to the previous selection.

These arrows are used to move to the next selection or to move the cursor position. Most of the menus (space permitting) include arrow key hints to guide the user.

These arrows are used primarily to change configuration data (numbers), at the current cursor position. Occasionally they may be used to scroll through a number of choices at the current cursor position. Most of the menus (space permitting) include arrow key hints to guide the user.

The keypad has an auto-repeat feature. If a key is held down for more than 1 second, the key action will repeat, automatically, at the rate of 15 keystrokes per second. This is particularly useful when editing numeric fields, with many digits, such as frequency or data rate.

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CDM-Qx Satellite Modem Revision 5 Front Panel Operation MN/CDMQx.IOM

5.2 Left-Hand Display Area

The left side of the display (or slot screen) efficiently indicates what is in the four plug-in slots and which slot is currently being addressed.

Four ungrouped plug-ins are displayed as in this example:

TX TX | (right hand display area) <RX> RX | (right hand display area)

This display indicates modulators in the top slots, and demodulators in the bottom. The locations of the four indicators line up with the location of the four slots when viewed from the back of the chassis. The left hand TX on the display corresponds with the top left slot in the chassis when viewed from the back. An empty slot is left blank.

The left RX on the example display is highlighted. This is the selected slot. All monitor functions (including the front panel LEDs) reflect the status of this slot. All parameters selected from the menu tree while this slot is selected apply either to this slot or to common functions. The menus for common functions appear redundantly in all four slots. To change slots, move the cursor to the desired slot, and press enter.

The designator for a plug-in device with an unmasked failure has an F suffix:

TX TXF | (right hand display area) <RX> RX | (right hand display area)

In this example, the upper right transmitter has a fault. (View the fault using Monitor, Alarms, etc).

5.2.1 Modems

A modulator in a top slot can be grouped with a demodulator in the slot directly below it to form a modem:

TX <MD> | (right hand display area) RX | (right hand display area)

The example indicates a configuration in the right hand slots (when viewed from the back of the chassis) grouped together to form a modem. Selecting the slots is the same as a basic configuration except that the blank area below the MD are not be selectable. When the modem is selected, the menus will display modulator and demodulator functions, and the software will select the appropriate plug-in for the command.

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CDM-Qx Satellite Modem Revision 5 Front Panel Operation MN/CDMQx.IOM

Two modems can share a modem:

MD <MD> | (right hand display area) | (right hand display area)

The selected modem is the modulator demodulator pair on the right side of the chassis (when viewed from the back). When modem is in CnC™ mode, the brackets (<>) will turn into bold characters.

5.2.2 Redundancy

Modules, (modulators and demodulators) can be upgraded to operate as redundant units. If enabled the module can back up a like kind module located anywhere in the chassis. If a modulator and demodulator have redundancy enabled and they are grouped as a modem, the pair can back up a modem. Note: The interface selected for the modules does not have to match the interface type used on the prime modules.

Three redundancy modes are possible with a modem. Back-up devices are notated with a B suffix while the designated prime modules (non-modem grouped) are noted with P suffix. In a non-modem configuration, the back-up device must be installed in slot #4. If a backup device has failed, the B suffix and the F suffix will alternately display.

1:1 redundant modems look similar to the two-modem example. The modems have independent monitor functions, but configuring the prime modem will configure the back up modem.

MD <MDB> | (right hand display area) | (right hand display area)

In this example, the backup modem is selected.

1:2 and 1:3 modulators or demodulators look similar to the basic display. A backup modulator or demodulator will back up all compatible modulators or demodulators in the chassis designated as primes.

The Online LED together with the selection bracket (<>) is used to indicate which device is online.

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CDM-Qx Satellite Modem Revision 5 Front Panel Operation MN/CDMQx.IOM

5.2.3 Spectrum Analyzer

The built-in spectrum analyzer mode is available, accessible via remote control, front panel or web browser. When it is active, the selected demod will not respond to specific Rx front panel settings, nor will it carry traffic. It is marked with an S suffix. It has it’s own front panel menu controls under “Test” menu.

TX TX | (right hand display area) <RX> RXS | (right hand display area)

In this example, the bottom right receiver (as seen from the back of the chassis) is being used as a spectrum analyzer. Only one Rx is allowed to enable spectrum analyzer in a chassis. To view the spectrum, the user needs a Windows application from Comtech or a web browser.

5.3 Right-Hand Display Area

Figure 5-3 shows the menu structure similar to the CDM-570L. The menus are shown fully populated, but if the addressed plug-in device is a modulator or a demodulator, much of the menu tree will be locked out. Functions that are not tied to a plug-in slot (like the external reference) are displayed no matter which slot is addressed.

The detailed screens and menus are as follows.

5.4 Accessing the Display Area

Since the front panel display screen is split into two, the left-hand display area (also called as the slot screen) can be accessed by using ◄ arrow key if the menu-level is MAIN, CONFIG, MONITOR, or INFO (and there is more than one module to select between).

To go back to the right-hand display area (also called the menu screen), just press CLR or ENT. By pressing ENT, the user has selected the plug-in card.

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CDM-Qx Satellite Modem Revision 5 Front Panel Operation MN/CDMQx.IOM

Para Title Remarks

5.5 Opening Screen

5.6 Main Menu Select: Config; Monitor; Test; Info; Save/Load; Util; ODU

5.61 Conf: Select: Remote; Tx; Rx; Group; Frame; Interface; Ref; Mask; ODU

5.6.1.1

5.6.1.2

5.6.1.3

5.6.1.4

5.6.1.5

5.6.1.6

5.6.1.7

5.6.1.8

5.6.1.9

5.6.2 Monitor Select: Alarms; Rx-Params; Event-Log; Stats; AUPC; CNC; ODU

5.6.2.1

5.6.2.2

5.6.2.3

5.6.2.4

5.6.2.5

5.6.2.6

5.6.2.7

5.6.3 Test Select: Mode; BIST; Spec-Analyzer

5.6.4 Info Select: Rem; Tx; Rx; Buffer; Frame; Interface; Mask; Ref; ID

5.6.5 Save/Load Select: Save; Load

5.6.6 Utility Select: RxBuffer; Clock; Ref; ID; Display; Firmware; FAST

5.6.7

Config → Remote Config → Tx Select: FEC; Mod; Code; Data; Freq; On/Off; Pwr; Scram; Clk; Inv; Txα Config → Rx Config → Group Config → Frame Config → Interface Config → Ref Config → Mask Config → ODU

Monitor → Alarms Monitor → Rx-Params Select: Eb/No, BER, ΔF, BUF, RSL Monitor → Event-Log Monitor → Stats Monitor → AUPC Monitor → CnC Carrier in Carrier® (CnC) is not locked. Monitor → ODU

Utility→FAST

Select: Local; Serial; Ethernet

Select: FEC; Demod; Code; Data; Freq; Acq; Descram; Buf; Inv; Misc; CNC Select: Modem; Redundancy Select: Unframed; EDMAC; EDMAC-2; D&I++ Select: RS422; V.35; RS232; HSSI; ASI; G.703; QDI; None Select: Internal; 10MHz Select: Transmit; Receive; Reference; BUC; LNB Select: BUC; LNB

Select: Transmit; Receive; Unit; ODU

Select: View; Clear-All Select: View; Clear-All; Config Framing is required for AUPC Monitor

Select: ODU; LNB

Select: Base; Slot1; Slot2; Slot3; Slot4

Figure 5-3. Principle Menu Tree

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Front Panel Operation MN/CDMQx.IOM

5.5 Opening Screen

Comtech EF Data CDM Firmware Version: 1.1.1

This screen is displayed whenever power is first applied to the unit (70/140 MHz version). The word “CDM-Qx” will be replaced with “CDM-QxL” for L-Band units. Pressing any key will take the user to the top-level selection screen:

5.6 TOP LEVEL SELECTION

MAIN MENU: Config Monitor Test Info Save/Load Util ODU

The user is presented with the following choices:

Config

Monitor

Test

Info

Save/Load

Util

ODU (70/140 MHz only)

(Configuration) This menu branch permits the user to fully configure the unit.

This menu branch permits the user to monitor the alarm status of the unit, to view the log of stored events, and to display the Receive Parameters screen.

This menu branch permits the user to invoke one of several test modes (loopbacks, for example).

(Information) This menu branch permits the user to view information on the unit, without having to go into configuration screens.

This menu branch permits the user to save and to retrieve up to 10 different modem configurations.

(Utility) This menu branch permits the user to perform miscellaneous functions, such as setting the Real-time clock, adjusting the display brightness, etc. For L-Band unit, the menu “Util” will be replaced with “Utility”. This menu permits the user to monitor and control Comtech CSAT and KST transceivers.

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CDM-Qx Satellite Modem Revision 5 Front Panel Operation MN/CDMQx.IOM

5.6.1 CONFIG

The sub-branches available are:

CONFIG: Remote Tx Rx Group Frame Interface Ref Mask ODU

Remote

Group

Frame

Interface

Ref

Mask

ODU (L-Band unit

only)

(Remote Control) This menu sub-branch permits the user to define whether the unit is being controlled locally, or remotely.

NOTE: The unit may be monitored over the remote control bus at any time. When in Local mode, however, configuration parameters may only be changed through the front panel. Conversely, when in Remote mode, the unit may be monitored from the front panel, but configuration parameters may only be changed via the remote control bus.

(Transmit) This menu sub-branch permits the user to define, on a parameterby-parameter basis, the transmit configuration of the unit.

(Receive) This menu sub-branch permits the user to define, on a parameterby-parameter basis, the receive configuration of the unit.

This menu sub-branch permits the user to group a vertically aligned modulator and demodulator into a modem, or to group any compatible plugins for redundancy.

This menu sub-branch permits the user to define if the unit should operate in a transparent mode (no framing) or in a framed mode. In the framed mode (EDMAC), an overhead of 5% is added to the rate transmitted over the satellite so that M&C information may be passed to the distant end.

(Interface) This menu sub-branch permits the user to define which electrical interface type is active at the data connectors.

(Reference) This menu sub-branch permits the user to define whether the unit should use its own internal 10MHz reference, or phase lock to an externally applied reference, and if so, at what frequency. If the internal reference is selected, it can optionally drive the connector.

This menu sub-branch permits the user to mask certain traffic alarms, which may cause problems to the user. As an example, certain multiplexers use ‘all ones’ as an idle pattern. However, by convention, the ‘all ones’ condition is taken to be the Alarm Indication Signal (AIS). The CDM-Qx monitors for the AIS condition, and if desired, this alarm may be masked.

(Outdoor Unit) This menu sub-branch permits the user to configure externally connected Low-noise Block Down Converter (LNB) and/or Block Up Converter (BUC) for L-Band units.

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CDM-Qx Satellite Modem Revision 5 Front Panel Operation MN/CDMQx.IOM

5.6.1.1 (ConfigRemote) – REMOTE CONTROL

Select Local, Serial, or Ethernet using the

(◄ ►)arrow keys, then press ENT.

Remote Control Entry: Local Serial Ethernet (◄ ►,ENT)

If Local is selected then remote control will be disabled. Remote monitoring is still possible.

(ConfigRemoteSerial)

If Serial is selected:

Remote Serial Config: Interface Baudrate (◄ ►,ENT)

(ConfigRemoteSerialInterface)

If Interface is selected:

M&C Serial Interface: RS232 RS485-2W RS485-4W (◄ ►,ENT)

Select RS232, RS485-2W (2-wire), or RS485-4W (4-wire), using the ◄ ► arrow keys, then press ENT.

At this point the user will be further prompted to enter the bus address.

If RS232 is selected, the following menu is displayed:

In RS-232 Mode, Serial Bus Base Address is fixed @ 0000

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CDM-Qx Satellite Modem Revision 5 Front Panel Operation MN/CDMQx.IOM

(ConfigRemoteSerialInterfaceRS485) - RS-485 Bus Address

However, if either RS-485 mode is selected, the user will be further prompted:

Edit RS-485 Serial Bus Base

Address: 0245 (◄ ►,▲▼,ENT)

Edit the RS-485 bus address of this unit. This is accomplished by selecting the digit to be edited, using the dcarrow keys. The user should then press ENT. The valid range of addresses is from 1 to 9999.

efarrow keys. The value of the digit is then changed using the

(ConfigRemoteSerialBaudrate)

If the user selects Baud Rate, the user is presented with the following menu:

M&C Serial Bus Baud Rate: 19200 Baud (▲ ▼,ENT)

Edit the baud rate of the remote control bus, connected locally to the M&C computer. The value is changed using the cdarrow keys. The user should then press ENT. Values of 2400, 4800, 9600, 19200, 38400, and 57600 baud are possible.

Note that the asynchronous character format is FIXED at 8 data bits, 1 stop bit, no parity (8-N-1).

(ConfigRemoteEthernet)

If Ethernet is selected:

Ethernet Config: (◄ ►, ENT) Gateway Address MAC SNMP

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CDM-Qx Satellite Modem Revision 5 Front Panel Operation MN/CDMQx.IOM

(ConfigRemoteEthernetGateway)

If Gateway is selected, the submenu will display:

M&C Ethernet IP Gateway:

192.128.001.001 (◄ ►▲ ▼, ENT)

Edit the IP Gateway Address for the Ethernet M&C port for this unit. This is accomplished by selecting the digit to be edited, using the ◄ ► arrow keys. The value of the digit is then changed using the

▲ ▼ arrow keys. The user should then press ENT.

(ConfigRemoteEthernetAddress)

If Address is selected, the submenu will display:

M&C Ether IP Address/Range:

192.168.001.001/24 (◄ ►▲ ▼,ENT)

Edit the IP Address and Range for the Ethernet M&C port for this unit. This is accomplished by selecting the digit to be edited, using the ◄ ► arrow keys. The value of the digit is then changed using the STarrow keys. The user should then press ENT.

(ConfigRemoteEthernetMAC)

If MAC is selected, the user will only be allowed to view it as displayed for example:

M&C Port MAC Address: 00-06-B0-00-00-D5

This is a read-only window, which displays the factory program MAC address for the Ethernet management interface.

(ConfigRemoteEthernetSNMP)

If SNMP is selected, the following sub-menu is displayed:

SNMP: Communities Traps (◄ ►, ENT)

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CDM-Qx Satellite Modem Revision 5 Front Panel Operation MN/CDMQx.IOM

(ConfigRemoteEthernetSNMPCommunities)

If Communities is selected:

SNMP Communities: Read Write (◄ ►, ENT)

If Read is selected, the following sub-menu is displayed:

Read Community: (◄ ► ▲ ▼, ENT) public

If Write is selected, the following sub-menu is displayed:

Write Community: (◄ ► ▲ ▼, ENT) private

Edit the SNMP Read or Write Community string using the ◄ ► and ▲ ▼ arrow keys. Only the first 20 characters on the bottom line are available. The cursor selects the position on the bottom line (◄ ►) and the character is then edited (▲ ▼). All printable ASCII characters are available with the exception of backslash (ASCII code 92) and ~ (ASCII code 126). When the user has composed the string, press ENT. All trailing spaces are removed from the Community string upon entering.

(ConfigRemoteEthernetSNMPTraps)

If Traps is selected, the following sub-menu is displayed:

Traps: Community Version IP Addr#1 IP Addr#2 (◄ ►, ENT)

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CDM-Qx Satellite Modem Revision 5 Front Panel Operation MN/CDMQx.IOM

If Community is selected, the following sub-menu is displayed.

Trap Community: (◄ ► ▲ ▼, ENT) comtech

Edit the Trap Community string using the ◄ ► and ▲ ▼ arrow keys. Only the first 20 characters on the bottom line are available. The cursor selects the position on the bottom line (◄ ►) and the character is then edited (▲ ▼). All printable ASCII characters are available with the exception of backslash (ASCII code 92) and ~ (ASCII code 126). When the user has composed the string, press ENT. All trailing spaces are removed from the Community string upon entering.

If Version is selected, the following sub-menu is displayed.

Trap Version: (◄ ►, ENT) SNMPv1 SNMPv2

Select SNMPv1 or SNMPv2, using the ◄ ► arrow keys, then press ENT.

If IP Addr#1 is selected, the following sub-menu is displayed:

Trap IP Addr#1: (◄ ► ▲ ▼ ENT)

000.000.000.000

If IP Addr#2 is selected, the following sub-menu is displayed:

Trap IP Addr#2: (◄ ► ▲ ▼ ENT)

000.000.000.000

These two IP Addresses are Trap Destination’s IP Addresses. Edit the IP Address by using the ◄ ► and ▲ ▼ arrow keys. If both Trap IP Address are 000.000.000.000, it means Trap is disabled.

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CDM-Qx Satellite Modem Revision 5 Front Panel Operation MN/CDMQx.IOM

5.6.1.2 (ConfigTx) - TRANSMIT

Tx: FEC Mod Code Data Freq On/Off Pwr Scram Clk Inv Txα

Select FEC, Mod, Code, Data, Freq, On/Off, Pwr, Scram, Clk, Inv, or Tx the ◄ ► arrow keys, then press ENT. The user will then be taken to a further submenu. Each of these choices is described briefly in the table below:

(Forward Error Correction) This sub-menu permits the user to select the method of FEC used

FEC

Mod

Code

Data

Freq

On/Off

Pwr

Scram

Clk

Inv

Txα

for transmission (Viterbi, TPC, etc). FEC type takes the highest configuration priority.

(Modulation) This sub-menu permits the user to select the modulation type used for transmission (BPSK, QPSK, 8-PSK, etc.). The available choice of modulation will depend on the FEC type chosen.

(FEC Code Rate) This sub-menu permits the user to select the FEC Code Rate used for transmission (Rate 1/2, Rate 3/4, etc). The available choice of Code Rate will depend on both the FEC type and Modulation type selected.

(Data Rate) This sub-menu permits the user to select the transmit data rate, in steps of 1 bps. The choice of data rate will depend on the FEC type, Modulation type, and Code Rate selected.

(Frequency) This sub-menu permits the user to select the transmit frequency, from 950 MHz to 1950 MHz, in steps of 100Hz for L-Band units, or from 50 MHz to 90 MHz and from 100 MHz to 180 MHz for 70/140MHz units.

This sub-menu permits the user to control the output state of the transmit carrier.

(Output Power level) This sub-menu permits the user to control the output level of transmit carrier, either manually, or using the AUPC (Automatic Uplink Power Control) feature.

(Scrambler) This sub-menu permits the user to select whether or not data scrambling is used.

(Clock Source) This sub-menu permits the user to select the clock source for transmission. This can be from the internal source, from an external source, or from the distant-end of the satellite link (loop timed).

(Inversion) This sub-menu permits the user to invert the sense of the transmitted spectrum, or to invert the sense of the transmitted baseband data or data clock

(α-Factor) This permits the user to select the modulator’s roll-off factor either 20% or 35%.

The FEC type takes the highest configuration priority, and the selection here depends on what, if any, optional plug-in Codecs are installed. The choice of

IMPORTANT

FEC type then determines what modulation types, code rates, and data rates are available. The order of hierarchy is therefore:

FEC type ► Modulation type ► Code Rate ► Data Rate (Highest) (Lowest)

α using

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If the user changes a parameter within this hierarchy, the other parameters may become invalid. In this case, the software will change those other parameters, in order that the configuration remains valid at all times.

Example: Suppose the user has selected Viterbi + Reed Solomon, QPSK, Rate 1/2. Now, the user changes the modulation type from QPSK to 16-QAM. In this case, Rate 1/2 is no longer a valid code rate, and so it will be automatically changed to the nearest valid code rate (Rate 3/4). Each of the configuration subbranches will now be described in detail.

(ConfigTxFEC) – TX FEC TYPE

Tx FEC: Vit Vit+RS TCM+RS TPC (◄ ►, ENT)

All possible choices are presented at all times. If an option is not installed (either Hardware, or FAST) or not valid, the ◄ ► arrow keys will force the

IMPORTANT

FEC Type RULES COMMENT

Vit (Viterbi) Always valid Vit+R-S (Viterbi +Concatenated

Reed-Solomon) TCM+R-S (Trellis Coded

Modulation + Concatenated ReedSolomon)

TPC (Turbo) If the TPC codec is installed

cursor to skip past the unavailable choice.

Always valid

If 8-PSK FAST is enabled Fixed at 8-PSK and

Rate 2/3

(ConfigTxMod) – MODULATION SCHEME

Modulation: BPSK QPSK 8 16-QAM (◄ ►, ENT)

All possible choices are presented at all times. If an option is not installed (either Hardware, or FAST) or valid , the ◄ ► arrow keys will force the

IMPORTANT

CASE RULES

BPSK Valid for all FEC types except TCM+R-S

QPSK Valid for all FEC types except TCM+R-S

8-PSK Valid for TCM+R-S, TPC (Turbo) requires 8-PSK FAST option

16-QAM Valid for Viterbi + R-S, TPC (Turbo) requires 16-QAM FAST option

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cursor to skip past the unavailable choice.

CDM-Qx Satellite Modem Revision 5 Front Panel Operation MN/CDMQx.IOM

(ConfigTxCode) – TX CODE RATE

Tx Code Rate: 5/16 21/44 1/2 2/3 3/4 7/8 17/18 (◄ ►)

All possible choices are presented at all times. If an option is not installed (either Hardware, or FAST) or valid, the ◄ ► arrow keys will force the

IMPORTANT

CASE RULES

5/16 Valid for BPSK and Turbo 21/44 Valid for BPSK, QPSK and Turbo 1/2 Valid for BPSK, QPSK, Viterbi, Viterbi+R-S 2/3 Valid for TCM+R-S only (8-PSK) 3/4 Valid for QPSK, 8-PSK, and 16-QAM 7/8 Valid for QPSK, 8-PSK, and 16-QAM 17/18 Valid for QPSK, 8-PSK , and Turbo

cursor to skip past the unavailable choice.

(ConfigTxData) – TX DATA RATE

Tx Data Rate: 05000.000kbps Sym:02500.000ksps

In Quad Drop&Insert (QDI) mode, these data rates are read-only! The data rate will be the sum of the tributary rates for all ports. This also will show the calculated symbol rate and Nx64kbps (where N=001 to 124).

The overall range of data rates is from 32 to 20000 kbps. The overall range of symbol rates is up to 10000 ksps. The minimum data rate is set to 32 kbps only for BPSK and

IMPORTANT

QPSK, and the maximum data rates are dependent on modulation type and FEC encoder rate. If the user changes the modulation or FEC, and the currently selected data rate can no longer be supported, the data rate will be adjusted automatically, up or down, keeping the symbol rate constant. The bottom line of the display shows the symbol rate, based on FEC type, modulation, FEC Code Rate, and Data Rate. The valid ranges of data rate are shown in the following table.

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FEC Type

Viterbi BPSK Rate 1/2 32 kbps to 5 Mbps Yes – see note below

Viterbi QPSK Rate 1/2 32 kbps to 10 Mbps Yes – see note below

Viterbi QPSK Rate 3/4 32 kbps to 15 Mbps Yes – see note below

Viterbi QPSK Rate 7/8 32 kbps to 17.5 Mbps Yes – see note below

Viterbi + R-S BPSK Rate 1/2 32 kbps to 4.5 Mbps Yes – see note below

Viterbi + R-S QPSK Rate 1/2 32 kbps to 9.1 Mbps Yes – see note below

Viterbi + R-S QPSK Rate 3/4 32 kbps to 13.7 Mbps Yes – see note below

Viterbi + R-S QPSK Rate 7/8 32 kbps to 16 Mbps Yes – see note below

Viterbi + R-S 16-QAM Rate 3/4 349.1 kbps to 20 Mbps Yes – see note below

Viterbi + R-S 16-QAM Rate 7/8 407.3 kbps to 20 Mbps Yes – see note below

TCM + R-S 8-PSK Rate 2/3 232.7 kbps to 18.3 Mbps Yes – see note below

TPC BPSK Rate 5/16 32 kbps to 3.1 Mbps Yes – see note below

TPC BPSK Rate 21/44 32 kbps to 4.7 Mbps Yes – see note below

TPC QPSK Rate 21/44 32 kbps to 9.5 Mbps Yes – see note below

TPC QPSK Rate 3/4 32 kbps to 15 Mbps Yes – see note below

TPC QPSK Rate 7/8 32 kbps to 17.5 Mbps Yes – see note below

TPC QPSK Rate 17/18 32 kbps to 18.888 Mbps Yes – see note below

TPC 8-PSK Rate 3/4 288 kbps to 20 Mbps No

TPC 8-PSK Rate 7/8 336 kbps to 20 Mbps No

TPC 8-PSK Rate 17/18 362.7 kbps to 20 Mbps No

TPC 16-QAM Rate 3/4 384 kbps to 20 Mbps No

TPC 16-QAM Rate 7/8 448 kbps to 20 Mbps No

Important Note: Where noted in the table above, if EDMAC framing is employed, the upper data rate will be reduced by 5% for data rates up to 2.048 Mbps, and by 1.6% for data rates above 2.048 Mbps, where EDMAC2 framing is used, or for Rate 21/44 BPSK/QPSK Turbo, or Rate 5/16 BPSK Turbo.

Modulation Code Rate Data Rate Range EDMAC limited?

Tx IF Freq: 1156.3456 MHz (◄ ►,▲ ▼, ENT)

(ConfigTxFreq) – TX IF FREQUENCY

Edit the Transmit IF Frequency. This is accomplished by selecting the digit to be edited, using the WXarrow keys. The value of the digit is then changed using the STarrow keys. The user should then press ENT. The range of frequencies depends upon the plugin module. The above example shows the L-Band version of modem.

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If (using the ODU, BUC menus) the user has selected a BUC LO frequency (other than zero) and defined whether the mix is high side or low side, the display will be modified as shown below, to include the calculated Transmit RF frequency of the modem/BUC combination:

Tx IF Freq: 1156.3456 MHz RF=14156.3456 (◄ ►▲ ▼ ENT)

As the Tx IF frequency is edited the RF frequency will automatically be updated

(ConfigTxOn/Off) – TRANSMIT ON/OFF CONTROL

Tx Output State: On Off RxTxInhibit Common (◄ ►, ENT)

Select either On, Off, RxTxInhibit, or Common using the WXarrow keys, then press ENTER.

When Rx-Tx Inhibit (RTI) is selected, it will prevent the TX carrier from being

transmitted, until the demodulator is locked.

To avoid the Tx Carrier from being turned off when the demodulator loses lock for a very short period of time, the demodulator must be unlocked continuously for a period of 10 seconds before the transmit carrier is inhibited. This time interval is fixed and the user cannot change it.

Having this feature enabled does not affect the internal IF Loopback feature. But, please be aware that if an external IF Loopback is attempted (connecting

IMPORTANT

When Common is selected, this sub-menu will appear:

an external cable from the Tx IF output to the Rx IF input), then this will not work! (The Tx carrier cannot turn on until the demod is locked, and the demod cannot lock, because the TX output is off. The net result is that the demod will not lock, and the Tx carrier will not turn on. USE THE RTI FEATURE WITH EXTREME CARE!

Tx Common Output State: Off On (◄ ► ENT)

This will turn On or Off all the transmit path – master control for all modulators.

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(ConfigTxPwr) – TRANSMIT POWER LEVEL MODE

Select the output power level mode, either Manual or AUPC, then press ENT.

Output Power Level Mode: Manual AUPC (◄ ►, ENT)

If the user selects Manual, the following menu is displayed:

(ConfigTxPwrManual) – MANUAL MODE

Tx Output Power Level:

-03.9 dBm (◄ ►, ▲ ▼, ENT)

Edit the output power level using the ◄ ► and STarrow keys, then press ENT.

If the user selects AUPC, and ‘Framed’ mode is not selected, the following menu is displayed:

Warning! AUPC needs Framed Mode (ENT or CLR)

Pressing either ENT or CLR returns the user to the previous menu with Manual selected.

If the user selects AUPC, and ‘Framed’ mode is selected, the following menu is displayed:

(ConfigTxPwrAUPC) – AUPC MODE

Target-Eb/No Max DemodUnlock (◄ ►, ENT)

Select either Target EbNo, Max-Range, Alarm or Demod-Unlock using the W Xarrow keys. The user should then press ENT.

ange Alarm

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(ConfigTxPwrAUPC) – TARGET Eb/No

Remote Demod -Target Eb/No Min Eb/No:9.9dB (◄ ►, ▲ ▼, ENT)

Edit the target Eb/No of the remote demod, using the ◄ ► Default value is 3.0 dB, and upper limit is 9.9 dB. The user should then press ENT.

and STarrow keys.

(ConfigTxPwrAUPC) – MAX RANGE

Maximum-permitted Power increase: 01dB (▲ ▼, ENT)

Edit the maximum permitted increase in power level (when in AUPC mode), using the STarrow keys. Default value is 1dB, and upper limit is 9 dB. Then press ENT.

(ConfigTxPwrAUPC) – ALARM

Action when max Tx Power reached: None TxAlarm (◄ ►,

Select the action that will occur if the AUPC causes the maximum output power level to be reached, either None or TxAlarm. Then press ENT.

(ConfigTxPwrAUPC) – DEMOD-UNLOCK

Action when Remote Demo unlocks: Nom-Pwr Max-Pwr

Select the action that will occur if the remote demod is unlocked. The choices are: NomPwr (Nominal Power), where the output level will revert to the nominal power level set

under Manual, or Max-Pwr, (Maximum Power), where the output level will change to the maximum permitted. The user should then press ENT.

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(ConfigTxPwrCombined) – COMBINED TRANSMIT POWER

Tx Combined Output Power:

-3.9 dBm (◄ ►,▲ ▼,ENT)

The combined power adjusts the level after all modulators in the chassis have been combined. It has a range of –5 dBm to +5 dBm. This level is fixed, and is not adjusted by AUPC.

(ConfigTxScram) – SCRAMBLER

Scrambling:Default

IESS-315-On Off (◄ ►,ENT)

The options are:

Default-On IESS-315-On

Off

the appropriate scrambler type is automatically selected this only applies when Turbo is installed and has been selected as the FEC type No scrambling

As before, the options are displayed all of the time, but the ◄ ► arrow keys will force the cursor to skip past an unavailable choice.

The default scrambler types are:

IMPORTANT

Viterbi, no framing: ITU V.35 (Intelsat variant) Viterbi, EDMAC frame: Comtech proprietary, frame synchronized

Viterbi + R-S or TCM/R-S: Per IESS-308, frame synchronized

TPC: Comtech proprietary, frame synchronized

(ConfigTxClk) – TX CLOCKING MODE

Tx Clocking Mode: Int Ext Loop-Timed ExtLoop (◄ ►,ENT)

Select Int (Internal), Ext (External) or Loop-Timed, using the ◄ ► arrow keys, then press ENT.

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Internal

External

LoopTimed

ExtLoop

indicates that the CDM-QX will supply a clock to the DTE, which is derived from its internal high-stability source.

indicates that the CDM-QX expects to receive a clock from the DTE, to which the unit can phase-lock its internal circuits. (If G.703 is selected as the Interface type, the software will force the clock mode to External.)

indicates that the transmit timing source should be the receive clock, from the direction of the satellite. This is a useful mode, in that no external connection needs to be made in this mode. If the demodulator loses lock, or if there is no receive signal present, the internal clock is substituted. Note also that this mode will work even with asymmetric Rx and Tx data rates. Indicates that the CDM-Qx expects to receive a clock from the DTE, which is derived from the received clock from the direction of the satellite. This is useful in CnC mode with G.703 interface wherein the remote station is relying on a centralized clock from the hub station.

(ConfigTxInv) – TX INVERSION FUNCTIONS

Tx Inversion functions: Spectrum Data Clock (◄ ►,ENT)

Select Spectrum or Data Clock, using the ◄ ► arrow keys, then press ENT.

If Spectrum is selected, the following sub-menu will be displayed:

Tx Spectral Inversion: Normal Inverted (◄ ►, ENT)

Select Normal or Inverted, using the ◄ ► arrow keys, then press ENT.

If Data Clock is selected, the following sub-menu will be displayed:

Tx Data Sense: Normal Inverted (◄ ►, ENT)

Select Normal or Inverted, using the ◄ ► arrow keys, then press ENT. If Clock is selected, the following sub-menu will be displayed:

Tx Clock Inversion: Normal Inverted (◄ ►, ENT)

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(ConfigTxTxα) – TX Roll-Off (α) factor

Tx Roll-off: 20% 35% (◄ ►, ENT)

Select 20% or 35%, using the ◄ ► arrow keys, then press ENT. The default is 35%.

5.6.1.3 (ConfigRx) - RECEIVE

The sub-branches available are:

Rx:FEC Demod Code Data Freq Acq Descram Buf Inv Misc CnC

Select FEC, Dem, Code, Data, Frq, Acq, Descram, Buf, Inv, Misc, or CnC® using the WXarrow keys, then press ENT. The user will then be taken to a further sub-menu. Each of these choices is described briefly in the table below:

FEC

Demod

Code

Data

Acq

On/Off

Descram

Buf

Inv

Misc

C-in-C

(Forward Error Correction) This sub-menu permits the user to select the method of FEC used for reception (Viterbi, TPC, etc.). FEC type takes the highest configuration priority.

(Demodulation) This sub-menu permits the user to select the modulation type used for reception (BPSK, QPSK, 8-PSK, etc.). The available choice of demodulation will depend on the FEC type chosen.

(FEC Code Rate) This sub-menu permits the user to select the FEC Code Rate used for reception (Rate 1/2, Rate 3/4, etc.). The available choice of Code Rate will depend on both the FEC type and Demodulation selected.

(Data Rate) This sub-menu permits the user to select the receive data rate, in steps of 1 bps. The choice of data rate will depend on the FEC type, Demodulation, and Code Rate selected.

(Acquisition) This sub-menu permits the user to determine the amount of frequency uncertainty the demodulator will search over in order to find and lock to an incoming carrier.

This sub-menu permits the user to control the output state of the transmit carrier.

(Descrambler) This sub-menu permits the user to select whether or not data descrambling is used.

(Buffer) This sub-menu permits the user to select whether or not the Plesiochronous/Doppler buffer is used, and if so, the size of that buffer.

(Inversion) This sub-menu permits the user to invert the sense of the received spectrum, or to invert the sense of the received baseband data.

(Miscellaneous) This sub-menu will allow the user to select Eb/No Alarm Threshold (EbNo) and Rx roll-off (alpha) factor Rxα.

(Carrier-in-Carrier®) This sub-menu allows the user to set-up the carrier-in-carrier parameters.

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The FEC type takes the highest configuration priority, and the selection here depends on what, if any, optional plug-in Codecs are installed. The choice of

IMPORTANT

FEC type then determines what demodulation types, code rates, and data rates are available. The order of hierarchy is therefore:

FEC type ► Demodulation type ► Code Rate ► Data Rate (Highest) (Lowest)

Example: Suppose the user has selected Viterbi + Reed-Solomon, QPSK, Rate 1/2. Now, the user changes the demodulation type from QPSK to 16-QAM. In this case, Rate 1/2 is no longer a valid code rate, and so it will be automatically changed to the nearest valid code rate (Rate 3/4).

Each of the configuration sub-branches will now be described in detail.

(ConfigRxFEC) – RX FEC TYPE

Rx FEC: Vit Vit+RS TCM+RS TPC (◄ ► ENT)

All possible choices are presented at all times. If an option is not installed (either Hardware, or FAST) or valid, the ◄ ► arrow keys will force the cursor to skip past the unavailable

IMPORTANT

choice.

CASE RULES COMMENT

Vit (Viterbi) Always valid Vit+R-S (Viterbi +Concatenated

Reed-Solomon) TCM+R-S (Trellis Coded

Modulation + Concatenated Reed-Solomon)

TPC (Turbo) If the TPC codec is installed

If Vit, Vit+RS, TCM+RS, or TPC is selected, the following sub-menu will be displayed:

Always valid

If 8-PSK FAST is enabled Fixed at 8-PSK and

Rate 2/3

Rx Rs (n/k): (◄ ►, ENT) IESS-310 network (219/201)

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(ConfigRxDemod) – DEMODULATION SCHEME

Demodulation: BPSK QPSK 8 16-QAM (◄ ► ENT)

All possible choices are presented at all times. If an option is not installed (either Hardware, or FAST) or valid, the ◄ ► arrow keys will force the cursor to skip past the unavailable choice.

IMPORTANT

CASE RULES

BPSK Valid for all FEC types except TCM+R-S QPSK Valid for all FEC types except TCM+R-S 8-PSK Valid for TCM+R-S, TPC (Turbo) requires 8-PSK FAST option 16-QAM Valid for Viterbi + R-S, TPC (Turbo) requires 16-QAM FAST option

(ConfigRxCode) – RX CODE RATE

Rx Code Rate: 5/16 21/44 1/2 2/3 3/4 7/8 17/18 (◄ ►)

All possible choices are presented at all times. If an option is not installed (either Hardware, or FAST) or valid, the ◄ ► arrow keys will force the cursor

IMPORTANT

CASE RULES

to skip past the unavailable choice.

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(ConfigRxData) – RX DATA RATE

Rx Data Rate: 05000.000kbps Sym:02500.000ksps

In QDI mode, these data rates are read-only! The data rate will be the sum of the tributary rates for all ports. This will also show the calculated symbol rate and Nx64kbps (where N=001 to 124).

The overall range of data rates is from 32 to 20000 kbps. The overall range of symbol rates is up to 10000 ksps. The minimum and maximum data rates are