Radyne OM20 User manual

Part Number MN-OM20 Revision 5
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.
OM20
Universal Outdoor Modem
Installation and Operation Manual

Copyright © 2009 Comtech EF Data.All rights reserved. Printed in the USA.
Comtech EF Data,2114 West 7thStreet, Tempe, Arizona 85281 USA, 480.333.2200, FAX: [phone]
OM20
Universal Outdoor Modem
Installation and Operation Manual
Part Number MN-OM20
Revision 5
October 27, 2009

This page is intentionally blank.

iii
Table of Contents
TABLE OF CONTENTS............................................................................................................................................. III
CHAPTER 1. INTRODUCTION ........................................................................................................................ 1–1
1.0 OVERVIEW...................................................................................................................................................1–1
1.1 OM20 CONFIGURATIONS...............................................................................................................................1–2
1.1.1 Features/Options Installed at Time of Order .......................................................................................1–3
1.1.2 Software Feature Upgrades.................................................................................................................1–3
1.1.3 Future Hardware Options ....................................................................................................................1–3
CHAPTER 2. INSTALLATION .......................................................................................................................... 2–1
2.1 INSTALLATION REQUIREMENTS.........................................................................................................................2–1
2.2 UNPACKING .................................................................................................................................................2–2
2.2.1 Outdoor Modem (OM20) .....................................................................................................................2–2
2.3 REMOVAL AND ASSEMBLY...............................................................................................................................2–3
2.4 MOUNTING AND WIRING CONSIDERATIONS .......................................................................................................2–4
2.4.1 OM20 Mounting Bracket Instructions..................................................................................................2–5
2.4.2 OM20 General Antenna Post Mount Diagram.....................................................................................2–6
2.4.3 OM20 General Antenna Post Mount Diagram.....................................................................................2–7
2.4.4 OM20 Antenna Feed Arm Mount Diagram..........................................................................................2–8
2.4.5 OM20 with External TWTA Amplifier...................................................................................................2–9
2.4.6 OM20 Additional Interface Diagrams................................................................................................2–10
CHAPTER 3. OM20 INITIAL CONFIGURATION ............................................................................................... 3–1
3.1 OM20 INITIAL CONFIGURATION CHECK ............................................................................................................3–1
3.2 INITIAL CONFIGURATION AND SETUP PROCESS ....................................................................................................3–3
3.2.1 Initial Power-Up and Configuration Verification..................................................................................3–3
3.2.2 M&C Setup (IP Configuration & RS232 Interface)................................................................................3–3
3.3 OM20 VERIFICATION TESTING ........................................................................................................................3–4
3.3.1 TX Output Verification Test..................................................................................................................3–4
3.3.2 RX Input Verification Test.....................................................................................................................3–5
3.4 STORAGE AND RESHIPMENT ............................................................................................................................3–5
CHAPTER 4. OM20 THEORY OF OPERATION ................................................................................................. 4–1
4.1 OM20 HARDWARE.......................................................................................................................................4–1
4.1.1 OM20 L-Band Printed Circuit Card .......................................................................................................4–2
4.1.2 OM20 Baseband Processing Printed Circuit Card ................................................................................4–3
4.2 OM20 FUNCTIONAL BLOCK DIAGRAM..............................................................................................................4–4
4.2.1 Baseband Processing ...........................................................................................................................4–4
4.2.2 Tx Baseband Processing.......................................................................................................................4–5
4.2.3 Rx Baseband Processing.......................................................................................................................4–5
4.3 MONITOR &CONTROL (M&C) SUBSYSTEM.......................................................................................................4–6
4.3.1 Terminal Port .......................................................................................................................................4–7
4.3.2 Modem Remote Communications (RLLP).............................................................................................4–7
4.3.3 Ethernet M&C Port...............................................................................................................................4–7
4.3.4 Modem Monitor Status........................................................................................................................4–8
4.4 ASYNC PORT /ES-ES COMMUNICATIONS ..........................................................................................................4–8

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4.5 INTERNAL CLOCK...........................................................................................................................................4–8
4.6 LOOPBACK FEATURES (TERRESTRIAL &IF)..........................................................................................................4–8
4.7 CLOCKING OPTIONS.....................................................................................................................................4–12
4.7.1 TX Clock Options ................................................................................................................................4–12
4.7.1.1 SCTE: Serial Clock Transmit External......................................................................................................... 4–13
4.7.1.2 SCT: Serial Clock Transmit ......................................................................................................................... 4–13
4.7.2 RX Buffer Clock Options .....................................................................................................................4–13
4.7.2.1 RX SAT Clock.............................................................................................................................................. 4–14
4.7.2.2 SCTE: Serial Clock Transmit External ......................................................................................................... 4–14
4.7.2.3 SCT: Serial Clock Transmit ......................................................................................................................... 4–14
4.7.2.4 EXT CLK/EXT BNC: ..................................................................................................................................... 4–14
4.7.2.5 EXT IDI: Insert Data In ............................................................................................................................... 4–14
4.7.3 EXT REF: External Reference, Optional...............................................................................................4–15
4.8 RS422/V.35 INTERFACE J3 (STANDARD OPTION).............................................................................................4–15
4.8.1 G.703 Interface (Optional) .................................................................................................................4–15
4.8.2 Ethernet Data Interface J4 (Optional)................................................................................................4–15
4.9 REED-SOLOMON CODEC...............................................................................................................................4–16
4.9.1 Reed-Solomon Operation in the OM20..............................................................................................4–16
4.9.2 Reed-Solomon Code Rate...................................................................................................................4–16
4.9.3 Interleaving........................................................................................................................................4–16
4.10 DROP AND INSERT (D&I)..............................................................................................................................4–17
4.11 OM20 AUTOMATIC UPLINK POWER CONTROL (AUPC OPERATION)....................................................................4–18
4.12 ASYNCHRONOUS OVERHEAD OPERATION J3 (FRAMING/MULTIPLEXER CAPABILITY).................................................4–18
4.13 STANDARD IBS MODE .................................................................................................................................4–19
4.14 ASYNCHRONOUS MULTIPLEXER MODE ...........................................................................................................4–20
4.15 ESC BACKWARD ALARMS .............................................................................................................................4–21
4.15.1 To Disable the ESC Backward Alarms ............................................................................................4–22
4.16 SATELLITE CONTROL CHANNEL (SCC)..............................................................................................................4–22
4.16.1 SCC Framing Structure...................................................................................................................4–22
4.16.2 Aggregate Data Rate.....................................................................................................................4–23
4.16.3 Overhead Rate Comparison...........................................................................................................4–24
4.16.4 Actual Overhead Rate Calculation.................................................................................................4–24
4.16.5 SCC Overhead Channel Setup ........................................................................................................4–25
4.17 EDMAC SATELLITE FRAMING/DEFRAMING MODE............................................................................................4–27
4.18 LOCATING THE ID CODE OPERATIONAL PROCEDURE...........................................................................................4–27
4.19 STRAP CODES .............................................................................................................................................4–27
CHAPTER 5. REAR PANEL INTERFACES.......................................................................................................... 5–1
5.1 OM20 EXTERNAL INTERFACE CONNECTIONS......................................................................................................5–1
5.1.1 Power Input..........................................................................................................................................5–3
5.1.1.1 AC Power Input (J1)..................................................................................................................................... 5–3
5.1.1.2 DC Power Input/Switch (Optional).............................................................................................................. 5–3
5.1.2 Remote/Terminal/Fault Port (J2) .........................................................................................................5–3
5.1.3 EIA-530 Synchronous Data, ES-ES Asynchronous Overhead Data, and G.703 Balanced Data I/O Port
(J3) 5–5
5.1.4 ETHERNET DATA/M&C (J4) ..................................................................................................................5–6
5.1.5 Ground Lug (J6)....................................................................................................................................5–7
5.1.6 RX L-Band IF (J7)...................................................................................................................................5–7
5.1.7 TX L-Band IF (J8)...................................................................................................................................5–7
5.1.8 Compact Flash Card (J9).......................................................................................................................5–7
5.1.9 SD (J10) (Optional) ...............................................................................................................................5–8
5.1.10 RD (J11) (Optional) ..........................................................................................................................5–8

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5.1.11 LED Indicators..................................................................................................................................5–8
5.1.12 G.703 Balanced – Connections are available via the J3 connector. Refer to Table 5.4a. ...............5–8
5.1.13 EXT Reference J12............................................................................................................................5–8
CHAPTER 6. WEB BROWSER/REMOTE PROTOCOL........................................................................................ 6–1
6.1 WEB BROWSER USER INTERFACE .....................................................................................................................6–1
6.2 CONFIGURING YOUR PC .................................................................................................................................6–1
6.2.1 Appearance..........................................................................................................................................6–2
6.2.2 Navigation ...........................................................................................................................................6–3
6.2.3 LED Indicators ......................................................................................................................................6–4
6.3 GUI SCREEN MENUS .....................................................................................................................................6–5
6.3.1 Introduction Menu ...............................................................................................................................6–6
6.3.1.1 Login Screen................................................................................................................................................ 6–7
6.3.2 Password Setup....................................................................................................................................6–8
6.3.3 IP and Application Administration .....................................................................................................6–10
6.3.3.1 Modem Addressing................................................................................................................................... 6–10
6.3.3.2 Configuring Applications ........................................................................................................................... 6–12
Table 6-5. SNMP Parameters........................................................................................................................................ 6–13
6.3.4 Monitor and Control Menu ................................................................................................................6–16
6.3.4.1 Transmit Menu.......................................................................................................................................... 6–16
6.3.4.2 Receive Menu ........................................................................................................................................... 6–29
6.3.4.3 Interface Menu ......................................................................................................................................... 6–37
6.3.4.4 Monitor Menu........................................................................................................................................... 6–44
6.3.4.5 Alarms Menu............................................................................................................................................. 6–49
6.3.4.6 System Menu ............................................................................................................................................ 6–56
6.3.4.7 Test Menu ................................................................................................................................................. 6–59
6.4 CONFIGURING THE OM20 TO USE THE ETHERNET DATA INTERFACE (OPTIONAL).....................................................6–60
6.4.1 Ethernet Flow Control ........................................................................................................................6–60
6.4.1.1 Half-Duplex Flow Control .......................................................................................................................... 6–60
6.4.1.2 Full-Duplex Flow Control........................................................................................................................... 6–61
6.4.2 Packet Statistics .................................................................................................................................6–61
6.5 TERMINAL MODE CONTROL ..........................................................................................................................6–62
6.5.1 Modem Terminal Mode Control.........................................................................................................6–63
6.6 MODEM REMOTE COMMUNICATIONS.............................................................................................................6–63
6.6.1 Host Computer Remote Communications..........................................................................................6–63
CHAPTER 7. MAINTENANCE AND TROUBLESHOOTING................................................................................. 7–1
7.1 PERIODIC MAINTENANCE................................................................................................................................7–1
7.1.1 Clock Adjustment .................................................................................................................................7–1
7.2 TROUBLESHOOTING .......................................................................................................................................7–1
7.2.1 Alarm Faults.........................................................................................................................................7–2
7.2.1.1 Major Tx Alarms.......................................................................................................................................... 7–2
7.2.1.2 Major Rx Alarms.......................................................................................................................................... 7–3
7.2.1.3 Minor Tx Alarms.......................................................................................................................................... 7–3
7.2.1.4 Minor Rx Alarms.......................................................................................................................................... 7–4
7.2.1.5 Drop and Insert Alarms ............................................................................................................................... 7–5
7.2.1.6 Common Major Alarms............................................................................................................................... 7–5
7.2.2 Alarm Masks ........................................................................................................................................7–5
7.2.2.1 Active Alarms .............................................................................................................................................. 7–6
7.2.2.1.1 Major Alarms.......................................................................................................................................... 7–6
7.2.2.1.2 Minor Alarms.......................................................................................................................................... 7–6
7.2.2.1.3 Common Equipment Faults.................................................................................................................... 7–6
7.2.2.2 Latched Alarms ........................................................................................................................................... 7–6

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CHAPTER 8. TECHNICAL SPECIFICATIONS ..................................................................................................... 8–1
8.1 DATA RATES.................................................................................................................................................8–1
8.2 MODULATOR ...............................................................................................................................................8–1
8.3 DEMODULATOR ............................................................................................................................................8–2
8.4 PLESIOCHRONOUS BUFFER ..............................................................................................................................8–2
8.5 MONITOR AND CONTROL................................................................................................................................8–2
8.6 OM20 DROP AND INSERT (OPTIONAL) .............................................................................................................8–2
8.7 TERRESTRIAL INTERFACES................................................................................................................................8–3
8.8 IDR/ESC INTERFACE (OPTIONAL) ....................................................................................................................8–3
8.9 ETHERNET DATA INTERFACE ............................................................................................................................8–3
8.10 ENVIRONMENTAL ..........................................................................................................................................8–3
8.11 PHYSICAL.....................................................................................................................................................8–3
8.12 OM20 DATA RATE LIMITS..............................................................................................................................8–3
8.12.1 Non-DVB ..........................................................................................................................................8–3
8.12.2 DVB ..................................................................................................................................................8–5
8.13 OM20 /BER SPECIFICATIONS ........................................................................................................................8–7
8.13.1 BER Performance (Viterbi) ...............................................................................................................8–7
8.13.2 BER Performance (Sequential).........................................................................................................8–8
8.13.3 BER Performance (Viterbi with Reed-Solomon)...............................................................................8–9
8.13.4 BER Performance (8PSK Trellis) .....................................................................................................8–10
8.13.5 BER Performance (16QAM Viterbi)................................................................................................8–11
8.13.6 BER Performance (16QAM Viterbi with Reed-Solomon)................................................................8–12
8.13.7 BER Performance ((O)QPSK Turbo)................................................................................................8–13
8.13.8 BER Performance (8PSK Turbo) .....................................................................................................8–14
8.13.9 BER Performance (16QAM Turbo).................................................................................................8–15
8.13.10 Input Level .....................................................................................................................................8–19
APPENDIX A. PRODUCT OPTIONS...................................................................................................................A–1
A.1 HARDWARE OPTIONS.................................................................................................................................... A–1
A.1.1 G.703/IDR ESC Interface ..................................................................................................................... A–1
A.1.2 Turbo Card .......................................................................................................................................... A–1
A.1.3 Internal High Stability ......................................................................................................................... A–1
A.1.4 DC Input Prime Power ......................................................................................................................... A–1
A.1.5 Ethernet Data Interface ...................................................................................................................... A–1
A.1.6 Sequential Interface............................................................................................................................ A–1
A.2 CUSTOMIZED OPTIONS.................................................................................................................................. A–2
APPENDIX B. SOFTWARE UPGRADE PROCEDURE ........................................................................................... B–1
B.1 TERMINAL SOFTWARE UPGRADE ..................................................................................................................... B–1
B.2 REQUIRED EQUIPMENT ................................................................................................................................. B–1
B.3 UPGRADE PROCEDURE .................................................................................................................................. B–1
B.4 DEMONSTRATION PROCEDURE ....................................................................................................................... B–3
B.5 CANCELING DEMONSTRATION MODE............................................................................................................... B–4
B.6 WEB BROWSER SOFTWARE UPGRADE .............................................................................................................. B–5
B.7 MONITOR AND CONTROL............................................................................................................................... B–5
APPENDIX C. CARRIER CONTROL.................................................................................................................... C–1
C.1 STATES........................................................................................................................................................C–1
C.2 CARRIER OFF................................................................................................................................................C–1
C.3 CARRIER ON.................................................................................................................................................C–1
C.4 CARRIER AUTO .............................................................................................................................................C–2

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C.5 CARRIER VSAT ..............................................................................................................................................C–2
C.6 CARRIER RTS ...............................................................................................................................................C–2
APPENDIX D. QUICK START GUIDE .................................................................................................................D–1
D.1 INTRODUCTION............................................................................................................................................ D–1
D.2 REQUIRED ITEMS.......................................................................................................................................... D–1
D.3 WEB INTERFACE SETUP GUIDELINES ................................................................................................................ D–1
D.3.1 Preparing the OM-20 for Web Setup .................................................................................................. D–1
D.4 IP NETWORK CHANGE FROM THE INITIAL WEB SETUP ......................................................................................... D–4
D.4.1 Configuring the modem ...................................................................................................................... D–4
D.4.2 Configuring the Computer .................................................................................................................. D–5
D.5 WEB USERS SETUP AND CONFIGURATIONS CONTROLS OPTIONS........................................................................... D–6
D.5.1 Change Authentication Password....................................................................................................... D–8
D.5.2 Boot Mode Options (Reference only).................................................................................................. D–8
APPENDIX E. DROP & INSERT (D&I) ............................................................................................................... E–1
E.1 DROP AND INSERT (D&I)................................................................................................................................E–1
E.2 DROP ONLY .................................................................................................................................................E–2
E.3 INSERT ONLY ................................................................................................................................................E–2
E.4 MODE SELECTION .........................................................................................................................................E–3
E.4.1 PCM-30 ................................................................................................................................................E–3
E.4.2 PCM-30C ..............................................................................................................................................E–3
E.4.3 PCM-31 ................................................................................................................................................E–4
E.4.4 PCM-31C ..............................................................................................................................................E–4
E.4.5 T1-D4/T1-D4-S .....................................................................................................................................E–4
E.4.6 T1-ESF/T1-ESF-S ...................................................................................................................................E–4
E.5 MULTIDESTINATIONAL SYSTEMS.......................................................................................................................E–4
E.6 DROP AND INSERT MAPPING ...........................................................................................................................E–5
E.7 CONFIGURING THE OM20 FOR DROP AND INSERT...............................................................................................E–7
E.7.1 Data Rate.............................................................................................................................................E–7
E.7.2 Operational Network Specification......................................................................................................E–8
E.7.3 Terrestrial Framing - Drop Mode/Insert Mode ....................................................................................E–8
E.7.3.1 Insert Terrestrial Frame Source .................................................................................................................. E–9
E.7.4 D&I Sample Configurations and D&I Clock Setup Options...................................................................E–9
E.8 D&I MAPS AND MAP EDITING ......................................................................................................................E–12
APPENDIX F. EFFICIENT DROP & INSERT (D&I) .............................................................................................. F–1
F.1 INTRODUCTION.............................................................................................................................................F–1
F.2 PREREQUISITE...............................................................................................................................................F–1
F.3 EFFICIENT DROP &INSERT MODE ....................................................................................................................F–2
F.3.1 Calculating the Required Satellite Bandwidth......................................................................................F–3
F.3.2 Calculating the Basic Efficient D&I Rate ..............................................................................................F–3
F.3.3 Calculating the Efficient D&I Rate with E1 Signaling ...........................................................................F–3
F.3.4 Calculating the Efficient D&I Rate with Enhanced Asynchronous Overhead .......................................F–4
APPENDIX G. STRAP CODES............................................................................................................................G–1
G.1 STRAP CODES .............................................................................................................................................. G–1
G.2 SAMPLE APPLICATIONS.................................................................................................................................. G–5
G.2.1 Operational Case Examples ................................................................................................................ G–5
APPENDIX H. AUPC OPERATIONS ...................................................................................................................H–1
H.1 AUTOMATIC UPLINK POWER CONTROL (AUPC OPERATION)................................................................................ H–1

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H.1.1 Radyne AUPC ...................................................................................................................................... H–1
H.1.2 EF AUPC............................................................................................................................................... H–2
H.1.3 Near Side AUPC................................................................................................................................... H–2

i
PREFACE
About this Manual
This manual describes the installation and operation for the Radyne OM20. This is a technical
document intended for earth station engineers, technicians, and operators responsible for the
operation and maintenance of the OM20.
Reporting Comments or Suggestions Concerning this Manual
Comments and suggestions regarding the content and design of this manual are appreciated. To
submit comments, please contact the Comtech EF Data Technical Publications department:
Conventions and References
[e-mail]
Related Documents
The following documents are referenced in this manual:
•EN300-421 and EN301-210 ETSI
•ETSI EN302-307
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 non-Metric to Metric conversions.

OM20 Universal Outdoor Modem Revision 5
Preface MN-OM20
ii
Cautions and Warnings
Trademarks
Product names mentioned in this manual may be trademarks or registered trademarks of their
respective companies and are hereby acknowledged.
I M PO RTA N T
IMPORTANT or NOTE indicates a statement associated with the task
being performed or information critical for proper equipment function.
CAUTION
CAUTION indicates a hazardous situation that, if not avoided, may result in
minor or moderate injury. CAUTION
may also be used to indicate other
unsafe practices or risks of property damage.
WARNING
WARNING indicates a potentially hazardous situatio
n that, if not avoided,
could result in death or serious injury.
Examples of
Multi-Hazard Formats

OM20 Universal Outdoor Modem Revision 5
Preface MN-OM20
iii
Safety Compliance
EN 60950
Applicable testing is routinely performed as a condition of manufacturing on all units to ensure
compliance with safety requirements of EN60950.This equipment meets the Safety of Information
Technology Equipment specification as defined in EN60950.
Low Voltage Directive (LVD)
The following information is applicable for the European Low Voltage Directive (EN60950):
<HAR> Type of power cord required for use in the European Community.
!
CAUTION: Double-pole/Neutral Fusing
ACHTUNG: Zweipolige bzw. Neutralleiter-Sicherung
International Symbols:
Symbol Definition Symbol Definition
~ Alternating Current Protective Earth /
Safety Ground
Fuse Chassis Ground
NOTE
For additional symbols, refer to Cautions and Warnings, listed
earlier in this Preface.

OM20 Universal Outdoor Modem Revision 5
Preface MN-OM20
iv
Warranty Policy
Comtech EF Data products are 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. Repairs are warranted for the remainder of the original
two year warranty, or a 90 day extended warranty, whichever is longer.
For equipment under warranty, the owner is responsible for freight to Comtech EF
Data and all related customs, taxes, tariffs, insurance, etc. Comtech EF Data is
responsible for the freight charges only for return of the equipment from the factory
to the owner. 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.
All equipment returned for warranty repair must have a valid RMA number issued
prior to return and be marked clearly on the return packaging. Comtech EF Data
strongly recommends all equipment be returned in its original packaging.
Comtech EF Data Corporation’s obligations under this warranty are limited to
repair or replacement of failed parts, and the return shipment to the buyer of the
repaired or replaced parts.
Limitations of Warranty
The warranty does not apply to any part of a product that has been installed,
altered, repaired, or misused in any way that, in the opinion of Comtech EF Data
Corporation, would affect the reliability or detracts from the performance of any
part of the product, or is damaged as the result of use in a way or with equipment
that had not been previously approved by Comtech EF Data Corporation.
The warranty does not apply to any product or parts thereof where the serial number
or the serial number of any of its parts has been altered, defaced, or removed.
The warranty does not cover damage or loss incurred in transportation of the
product.
The warranty does not cover replacement or repair necessitated by loss or
damage from any cause beyond the control of Comtech EF Data Corporation,
such as lightning or other natural and weather related events or wartime
environments.
The warranty does not cover any labor involved in the removal and or
reinstallation of warranted equipment or parts on site, or any labor required to
diagnose the necessity for repair or replacement.

OM20 Universal Outdoor Modem Revision 5
Preface MN-OM20
v
The warranty excludes any responsibility by Comtech EF Data Corporation for
incidental or consequential damages arising from the use of the equipment or
products, or for any inability to use them either separate from or in combination with
any other equipment or products.
A fixed charge established for each product will be imposed for all equipment
returned for warranty repair where Comtech EF Data Corporation cannot identify
the cause of the reported failure.
Exclusive Remedies
Comtech EF Data Corporation’s warranty, as stated is in lieu of all other
warranties, expressed, implied, or statutory, including those of merchantability
and fitness for a particular purpose. The buyer shall pass on to any purchaser,
lessee, or other user of Comtech EF Data Corporation’s products, the
aforementioned warranty, and shall indemnify and hold harmless Comtech EF
Data Corporation from any claims or liability of such purchaser, lessee, or user
based upon allegations that the buyer, its agents, or employees have made
additional warranties or representations as to product preference or use.
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.

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Preface MN-OM20
vi
Customer Support
Contact the Comtech EF Data Customer Support Department for:
•Product support or training
•Reporting comments or suggestions concerning manuals
•Information on upgrading or returning a product
A Customer Support representative may be reached at:
Comtech EF Data
Attention: Customer Support Department
2114 West 7th Street
Tempe, Arizona 85281 USA
480.333.2200 (Main Comtech EF Data number)
480.333.4357 (Customer Support Desk)
480.333.2161 FAX
To return a Comtech EF Data product (in-warranty and out-of-warranty) for repair or replacement:
•Contact the Comtech EF Data Customer Support Department. Be prepared to supply
the Customer Support representative with the model number, serial number, and a
description of the problem.
•Request a Return Material Authorization (RMA) number from the Comtech EF Data
Customer Support representative.
•Pack the product in its original shipping carton/packaging to ensure that the product is
not damaged during shipping.
•Ship the product back to Comtech EF Data. (Shipping charges should be prepaid.)
Online Customer Support
An RMA number request can be requested electronically by contacting the Customer Support
Department through the online support page at www.comtechefdata.com/support.asp:
•Click on the “Service” hyperlink, then read the “Return Material Authorization” section
for detailed instructions on our return procedures.
•Click on the “RMA Request Form” hyperlink, then fill out the form completely before
sending.
•Send e-mail to the Customer Support Department at [e-mail].
For information regarding this product’s warranty policy, refer to the Warranty Policy, p. xxii.

MN-OM20– Revision 5 1–1
Chapter 1. Introduction
This chapter provides an overview of the OM20 Outdoor Modem. The OM20 system can support
a C-Band with power levels of 2, 5 and 10 watts or Ku-Band with output powers of 2, 4 and 8
watts.
Figure 1.1. Outdoor Modem (OM20) without protective shroud
1.0 Overview
Radyne’s OM20 outdoor modem is based on Radyne’s DMD20/LBST modem product platform.
The Transmit IF output and Receive IF input frequencies of the OM20 are 950 to 2050 MHz.
The modem operates over a data rate range of 2.4 Kbps to 20 Mbps in 1 bps steps including at all
standard IBS and IDR Data rates up to 8.448 Mbps. A full range of Industry Standard Data
Interfaces is available for the OM20. Interface types are selectable from EIA-530 (J3), Ethernet
(J4), optional ITU G.703 (Unbalanced on J10/11, Balanced on J3), and an optional ASI (J10/11).
The OM20 is available with optional feed mounted C or Ku-Band LNB’s for the downlink, and
optional feed mounted 2/4/8 Watt Ku-Band or 5/10 Watt C-Band BUC’s for the uplink.

OM20 Universal Outdoor Modem Introduction
MN-OM20– Revision 5 1–2
The OM20 supplies DC voltage and 10 MHz reference to the BUC and LNB via the IF Cables.
The output from the TX Port (J8) consists of the L-Band output frequency, high-stability 10 MHz
reference, and an optional 24 or 48 Volts to the BUC. The RX Port I/O (J7) consists of the L-
Band input frequency (from the LNB), high-stability 10 MHz reference and 13, 15, 18, and 21
volts. The OM20 has the capability to enable and disable the BUC/LNB voltages and 10 MHz
reference.
In addition, monitoring features provide verification of BUC and LNB status. The OM20
monitors both the current and the voltage at the output of the TX and RX Ports, thus allowing the
user to monitor the operating status of BUC and LNB.
Redundancy for the OM20 is supported by the OMS11, Outdoor Modem Switch. OMS11 offers
redundancy for Data and supplies power for switching TX and RX Waveguide switches. For
additional information, refer to TM133 OMS11 Operational Manual.
Radyne’s OM20 Ethernet Graphical User Interface (GUI) offers browser based control of the
OM20, BUC, and LNB with numerous user-friendly GUI programmable functions (see Figure 1-
2). The OM20 GUI provides selectable functions for different services: Intelsat IDR and IBS, as
well as closed networks. All of the configuration and Monitor and Control (M&C) functions are
available using the GUI (Ethernet J4) or is also available using the conventional RS-232/485
terminal port (J2). Operating parameters, such as variable data rates, FEC Code Rate, modulation
type, IF Frequencies, IBS/IDR Framing, and interface type can be readily set and changed by
earth station operations personnel, using either the GUI or terminal interfaces.
Figure 1-2. OM20 Outdoor Modem Upper GUI Screen
1.1 OM20 Configurations
The OM20 can be configured in the following different ways:
Features and options are installed as specified when the unit is ordered from the factory,
Optional software feature upgrades in the future while deployed in the field,
Future hardware options can be installed to a unit that is sent back to a Radyne facility.

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1.1.1 Features/Options Installed at Time of Order
Features installed at the time of ordering are the options pre-installed/initialized in the factory
prior to shipment. Features and options can be reviewed from the GUI or remote port of the
OM20. Refer to Section 4, “User Interfaces” for information on how to view these features.
Factory installed options are chassis and board configurations that are introduced during
manufacture. These options include (Options are subject to change):
Input Power: AC 2-5 W BUC (24VDC), AC 8-10W BUC (48 VDC),
Input Power: DC 2-5 W BUC (24VDC), DC 8-10W BUC (48 VDC)
Data Rate: 5 Mbps (standard), optional 10, 20 Mbps
Interface: EIA-530 (standard), Optional Ethernet, G.703, ASI
M&C Interface – SNMP Ethernet/Web Browser – RS485, RS232
Viterbi Codec (standard), Optional Sequential Codec
Optional Custom Reed Solomon
Optional IBS, IDR, Drop and Insert
Optional External Reference Input Connector
Modulation: BPSK, QPSK, OQPSK (standard), Optional 8PSK, 16 QAM
Optional Turbo, 5Mbps, 20Mbps
Sequential Codec, and custom programmable Reed Solomon.
Optional OM73
Optional DVB
Optional Cable, Waveguide, Mounting Kits
M&C Interface – SNMP, Ethernet/Web Browser, RS485, RS232
1.1.2 Software Feature Upgrades
Software Feature Upgrades are a simple and quick way of changing the feature set of an installed
modem. Feature upgrades are how most OM20 options are implemented. Features may be
purchased at any time by contacting a Radyne Corp. salesperson. Refer to Appendix B for
information on how upgrade features.
1.1.3 Future Hardware Options
Hardware options (Refer to Appendix A) are purchased parts that can only be installed at a
Comtech Facility. Please contact the Comtech EF Data Customer Service Department for
information not limited to availability and to shipping costs.
Only authorized service personnel should handle and install
optional hardware options.

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MN-OM20– Revision 5 1–4
Notes: