MD2401
L-Band Multi Demod
Installation and Operation Manual
IMPORTANT NOTE: The information contained in this document supersedes all previously
published information regarding this product. This manual is subject to change without prior notice.
Part Number MN-MD2401 Revision 7
MD2401
L-Band Multi Demod
Installation and Operation Manual
Part Number MN-MD2401
Revision 7
September 2, 2010
Copyright © 2010 Comtech EF Data. Al l rights reserv ed. Printed in the USA.
Comtech EF Data, 21 14 Wes t 7th St re et , Tem pe, Ariz on a 85 28 1 USA, 480.333.220 0, FAX: 480.333.2161
This page is intentionally blank.
Table of Contents
TABLE OF CONTENTS ............................................................................................................III
CHAPTER 1. INTRODUCTION .................................................................................. 1–1
1.1 Description ................................................................................................................................... 1–1
1.2 MD2401 Available Options ........................................................................................................ 1–2
1.2.1 Reed-Solomon Codec ........................................................................................................... 1–2
1.2.2 Turbo Codec .......................................................................................................................... 1–2
1.2.3 8PSK (Optional) .................................................................................................................... 1–2
1.3 Ethernet Data Interface (Optional) ........................................................................................... 1–2
CHAPTER 2. INSTALLATION ................................................................................... 2–1
2.1 Unpacking and Inspection .......................................................................................................... 2–1
2.2 Installation Requirements .......................................................................................................... 2–2
2.3 Mounting Considerations ........................................................................................................... 2–2
2.4 Demodulator Checkout............................................................................................................... 2–4
2.4.1 Initial Power-Up .................................................................................................................... 2–4
2.4.2 Factory Terminal Setup (Refer to Section 4.4) ..................................................................... 2–4
2.4.3 Remote Protocol Factory Default Setup ............................................................................... 2–5
2.5 Storage ......................................................................................................................................... 2–5
CHAPTER 3. THEORY OF OPERATION .................................................................. 3–1
3.1 Theory of Operation ................................................................................................................... 3–1
3.2 Applications ................................................................................................................................. 3–3
3.2.1 SCPC Point-to-Point Links ................................................................................................... 3–3
3.2.2 SCPC Point to Multi–Point Links in a Broadcast Application ............................................. 3–3
3.2.3 DAMA (Demand Assigned Multiple Access) ...................................................................... 3–4
3.2.4 TDMA (Time Division Multiple Access) Remote Site Application ..................................... 3–4
3.3 3.2 Clocking Options .................................................................................................................. 3–4
3.3.1 RX Buffer Clock Options ..................................................................................................... 3–5
3.3.1.1 RX SAT Clock .................................................................................................................. 3–5
3.3.1.2 SCT: Serial Clock Transmit .............................................................................................. 3–5
3.3.2 EXT REF: External Reference, J2 ........................................................................................ 3–6
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3.4 MD2401 Reed-Solomon .............................................................................................................. 3–6
3.4.1 Reed-Solomon Codec ........................................................................................................... 3–6
3.4.2 Reed-Solomon Operation in the MD2401 Demodulator ...................................................... 3–6
3.4.3 Reed-Solomon Code Rate ..................................................................................................... 3–6
3.4.4 Interleaving ........................................................................................................................... 3–7
CHAPTER 4. USER INTERFACES............................................................................ 4–1
4.1 User Interfaces ............................................................................................................................ 4–1
4.1.1 Front Panel User Interface .................................................................................................... 4–1
4.2 MD2401 Demodulator Remote Port Control (J5) .................................................................... 4–1
4.3 MD2401 Demodulator Terminal Mode Control (J1) ............................................................... 4–2
4.4 Terminal Port User Interface ..................................................................................................... 4–2
4.4.1 Connecting the Terminal ....................................................................................................... 4–2
4.4.2 Terminal Screens................................................................................................................... 4–3
4.5 Remote Port User Interface (J5) .............................................................................................. 4–10
4.5.1 Protocol Structure ............................................................................................................... 4–10
4.5.2 Protocol Wrapper ................................................................................................................ 4–10
4.5.3 Frame Description and Bus Handshaking ........................................................................... 4–12
4.5.4 Global Response Operational Codes ................................................................................... 4–13
4.5.5 Collision Avoidance ............................................................................................................ 4–14
4.5.6 Software Compatibility ....................................................................................................... 4–15
4.5.7 Flow Control and Task Processing ..................................................................................... 4–16
4.5.8 RLLP Summary .................................................................................................................. 4–16
4.5.9 MD2401 Opcode Command Set ......................................................................................... 4–18
4.5.10 Demodulator Command Set ................................................................................................ 4–18
4.5.11 Module Command Set ........................................................................................................ 4–18
4.5.12 Detailed Command Descriptions ........................................................................................ 4–19
4.5.12.1 DMD2401 Demodulator ................................................................................................. 4–19
4.6 If G.703 Daughter Card Installed ............................................................................................ 4–23
4.7 4.4.12.2 Module Queries & Commands ................................................................................. 4–41
4.8 4.4.12.3 Default Values Demodulator ..................................................................................... 4–44
CHAPTER 5. REAR PANEL INTERFACES .............................................................. 5–1
5.1 MD2401 Connections .................................................................................................................. 5–1
5.2 Power ............................................................................................................................................ 5–2
5.3 Terrestrial Data & Terminal Cont rol Inte r face (J1) ............................................................... 5–2
5.4 Ethernet Data Interface .............................................................................................................. 5–3
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5.4.1 Compatibility ........................................................................................................................ 5–3
5.4.2 Auto-Crossover, Auto-Polarity, and Auto-Negotiation ........................................................ 5–3
5.4.3 Automatic Demodulator card detection and dedicated HDLC decoders .............................. 5–3
5.4.4 Ingress Quality of Service ..................................................................................................... 5–3
5.4.5 Egress Quality of Service ...................................................................................................... 5–3
5.4.6 Prioritized Queues ................................................................................................................. 5–4
5.5 EXT REF ..................................................................................................................................... 5–4
5.6 SERIAL CONTROL & AGC Monitor (J3).............................................................................. 5–4
5.7 RX IN ........................................................................................................................................... 5–5
5.7.1 L-Band (J4) ........................................................................................................................... 5–5
5.8 Remote Port (J5) ......................................................................................................................... 5–5
5.9 Remote Addresses ....................................................................................................................... 5–6
CHAPTER 6. MAINTENANCE AND TROUBLESHOOTING ..................................... 6–1
6.1 Basic Troubleshooting and Maintenance .................................................................................. 6–1
CHAPTER 7. TECHNICAL SPECIFICATIONS .......................................................... 7–1
7.1 Introduction ................................................................................................................................. 7–1
7.2 Receive Data Rates ...................................................................................................................... 7–1
7.3 Demodulator Specifications ....................................................................................................... 7–1
7.4 Standard Options ........................................................................................................................ 7–2
7.5 Environmental ............................................................................................................................. 7–2
7.6 Physical ........................................................................................................................................ 7–2
7.7 MD2401 BER Specifications ...................................................................................................... 7–3
7.7.1 BER Performance (Viterbi) .................................................................................................. 7–3
7.7.2 BER Performance (Viterbi - w/Reed-Solomon) ................................................................... 7–4
7.7.3 BER Performance (Turbo) .................................................................................................... 7–5
7.7.4 BER Performance (8PSK Trellis) ......................................................................................... 7–6
7.7.5 BER Performance (8PSK Turbo) .......................................................................................... 7–7
7.7.6 BER Performance ((O)QPSK Turbo) ................................................................................... 7–8
7.7.7 BER Performance (8PSK Turbo) .......................................................................................... 7–9
7.8 MD2401 Input Level ................................................................................................................. 7–12
7.9 AGC Curve ................................................................................................................................ 7–13
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Notes:
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PREFACE
About this Manual
This manual provides installation and operation information for the Comtech EF Data MD2401
Multi-Demod System. This is a technical document intended for earth station engineers,
technicians, and operators responsible for the operation and maintenance of the MD2401.
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:
TechnicalPublications@comtechefdata.com
Trademarks
Product names mentioned in this manual may be trademarks or registered trademarks of
their respective companies and are hereby acknowledged.
Copyright
2010, Comtech EF Data This manual is proprietary to Comtech EF Data and is
intended for the exclusive use of Comtech EF Data’s customers. No part of this
document may in whole or in part, be copied, reproduced, distributed, translated or
reduced to any electronic or magnetic storage medium without the express written
consent of a duly authorized officer of Comtech EF Data
Conventions and References
Metric Conversion
Metric conversion information is located on the insi de back cover of this manual. This i nformation
is provided to assist the operator in cross-referencing non-metric to metric conversions.
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