Radyne DMD20 LBST User manual

DMD20/DMD20 LBST
Universal Satellite Modem
Installation and Operation Manual
TM103
Revision 2.5
Radyne Corp. •3138 E. Elwood St. •Phoenix, AZ 85034 •[phone] •Fax: [phone] •www.radn.com

DMD20/DMD20 LBST Universal Satellite Modem Warranty Policy
TM103 – Rev. 2.5 iii
Warranty Policy WP
Radyne Corp. (Seller) warrants the items manufactured and sold by Radyne Corp. to be free of defects in
material and workmanship for a period of two (2) years from date of shipment Radyne Corp.’s obligation
under its warranty is limited in accordance with the periods of time and all other conditions stated in all
provisions of this warranty.
This warranty applies only to defects in material and workmanship in products manufactured by Radyne
Corp. Radyne Corp. makes no warranty whatsoever concerning products or accessories not of its
manufacture. Repair, or at the option of Radyne Corp., replacement of the Radyne Corp. products or
defective parts therein shall be the sole and exclusive remedy for all valid warranty claims.
Warranty Period
The applicable warranty period shall commence on the date of shipment from a Radyne Corp. facility to the
original purchaser and extend for the stated period following the date of shipment. Upon beginning of the
applicable Radyne Corp. warranty period, all customers’ remedies shall be governed by the terms stated or
referenced in this warranty. In-warranty repaired or replacement products or parts are warranted only for the
remaining unexpired portion of the original warranty period applicable to the repaired or replaced products or
parts. Repair or replacement of products or parts under warranty does not extend the original warranty
period.
Warranty Coverage Limitations
The following are expressly not covered under warranty:
1. Any loss, damage and/or malfunction relating in any way to shipping, storage, accident, abuse,
alteration, misuse, neglect, failure to use products under normal operating conditions, failure to use
products according to any operating instructions provided by Radyne Corp., lack of routine care
and maintenance as indicated in any operating maintenance instructions, or failure to use or take
any proper precautions under the circumstances.
2. Products, items, parts, accessories, subassemblies, or components which are expendable in
normal use or are of limited life, such as but not limited to, bulbs, fuses, lamps, glassware, etc.
Radyne Corp. reserves the right to revise the foregoing list of what is covered under this warranty.
Warranty Replacement and Adjustment
Radyne Corp. will not make warranty adjustments for failures of products or parts, which occur after the
specified maximum adjustment period. Unless otherwise agreed, failure shall be deemed to have occurred
no more than seven (7) working days before the first date on which Radyne Corp. receives a notice of
failure. Under no circumstances shall any warranty exceed the period stated above unless expressly agreed
to in writing by Radyne Corp.
Liability Limitations
This warranty is expressly in lieu of and excludes all other express and implied warranties, Including but not
limited to warranties of merchantability and of fitness for particular purpose, use, or applications, and all
other obligations or liabilities on the part of Radyne Corp., unless such other warranties, obligations, or
liabilities are expressly agreed to in writing by Radyne Corp.
All obligations of Radyne Corp. under this warranty shall cease in the event its products or parts thereof
have been subjected to accident, abuse, alteration, misuse or neglect, or which have not been operated and
maintained in accordance with proper operating instructions.

Warranty Policy DMD20/DMD20 LBST Universal Satellite Modem
iv TM103 - Rev. 2.5
In no event shall Radyne Corp. be liable for Incidental, consequential, special or resulting loss or damage of
any kind howsoever caused. Radyne Corp.’s liability for damages shall not exceed the payment, if any,
received by Radyne Corp. for the unit or product or service furnished or to be furnished, as the case may be,
which is the subject of claim or dispute.
Statements made by any person, including representatives of Radyne Corp., which are inconsistent or in
conflict with the terms of this warranty, shall not be binding upon Radyne Corp. unless reduced to writing
and approved by an officer of Radyne Corp.
Warranty Repair Return Procedure
Before a warranty repair can be accomplished, a Repair Authorization must be received. It is at this time
that Radyne Corp. will authorize the product or part to be returned to the Radyne Corp. facility or if field
repair will be accomplished. The Repair Authorization may be requested in writing or by calling:
Radyne Corp.
3138 E. Elwood St.
Phoenix, Arizona 85034 (USA)
ATTN: Customer Support
Phone: [phone]
Fax: [phone]
Any product returned to Radyne Corp. for examination must be sent prepaid via the means of transportation
indicated as acceptable to Radyne Corp. Return Authorization Number must be clearly marked on the
shipping label. Returned products or parts should be carefully packaged in the original container, if possible,
and unless otherwise indicated, shipped to the above address.
Non-Warranty Repair
When a product is returned for any reason, Customer and its shipping agency shall be responsible for all
damage resulting from improper packing and handling, and for loss in transit, not withstanding any defect or
nonconformity in the product. By returning a product, the owner grants Radyne Corp. permission to open
and disassemble the product as required for evaluation. In all cases, Radyne Corp. has sole responsibility
for determining the cause and nature of failure, and Radyne Corp.’s determination with regard thereto shall
be final.

DMD20/DMD20 LBST Universal Satellite Modem Preface
TM103 – Rev. 2.5 v
Preface P
This manual provides installation and operation information for the Radyne DMD20 and DMD20
LBST Universal Satellite Modem. This is a technical document intended for use by engineers,
technicians, and operators responsible for the operation and maintenance of the DMD20 and
DMD20 LBST.
Conventions
Whenever the information within this manual instructs the operator to press a pushbutton switch
or keypad key on the Front Panel, the pushbutton or key label will be shown enclosed in "less
than" (<) and "greater than" (>) brackets. For example, the Reset Alarms Pushbutton will be
shown as <RESET ALARMS>, while a command that calls for the entry of a ‘7’ followed by
‘ENTER’ Key will be represented as <7,ENTER>.
Cautions and Warnings
A caution icon 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.
A warning icon indicates a potentially hazardous situation that if not avoided, could result in death
or serious injury.
A note icon identifies information for the proper operation of your equipment, including helpful
hints, shortcuts, or important reminders.

Preface DMD20/DMD20 LBST Universal Satellite Modem
vi TM103 - Rev. 2.5
Trademarks
Product names mentioned in this manual may be trademarks or registered trademarks of their
respective companies and are hereby acknowledged.
Copyright
©2005, Radyne Corp. This manual is proprietary to Radyne Corp. and is intended for the
exclusive use of Radyne Corp.’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 Radyne Corp.
Disclaimer
This manual has been thoroughly reviewed for accuracy. All statements, technical information,
and recommendations contained herein 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. Radyne Corp. assumes no responsibility for use of any
circuitry other than the circuitry employed in Radyne Corp. systems and equipment. Furthermore,
since Radyne Corp. is constantly improving its products, reserves the right to make changes in
the specifications of products, or in this manual at any time without notice and without obligation
to notify any person of such changes.
Record of Revisions
Revision
Level Date Reason for Change
1.0 2-26-03 Initial Release
1.1 5-7-03 Revised Sections 2.2 and 5.1 for CE Certification.
1.2 7-11-03 Revised RLLP Specification.
2.0 3-17-04 Added LBST to the manual.
2.1 5-6-04 Added Ethernet option to the manual.
2.2 7-20-04 Added Variable Reed-Solomon option to the manual.
2.3 10-5-04 Added LBST pinouts.
2.4 4-6-05 Revised RLLP and MIB.
2.5 10-31-05 Revised Section 3 through 5
Comments or Suggestions Concerning this Manual
Comments or suggestions regarding the content and design of this manual are appreciated. To
submit comments, please contact the Radyne Corp. Customer Service Department.

DMD20/DMD20 LBST Universal Satellite Modem Table of Contents
TM103 – Rev. 2.5 vii
Table of Contents ToC
Section 1 - Introduction
1.0 Overview________________________________________________________ 1-1
1.1 DMD20 Configurations _____________________________________________ 1-2
1.1.1 Features/Options Installed at Time of Order ___________________________ 1-2
1.1.2 Feature Upgrades _______________________________________________ 1-2
1.1.3 Hardware Options _______________________________________________ 1-3
1.1.4 Radyne Installed Options _________________________________________ 1-3
1.2 Function Accessibility ______________________________________________ 1-3
Section 2 - Installation
2.0 Installation Requirements ___________________________________________ 2-1
2.1 Unpacking_______________________________________________________ 2-2
2.2 Removal and Assembly ____________________________________________ 2-2
2.3 Mounting Considerations ___________________________________________ 2-2
2.4 DMD20 Initial Configuration Check____________________________________ 2-3
2.5 Modulator Checkout _______________________________________________ 2-4
2.5.1 Initial Power-Up _________________________________________________ 2-4
2.5.2 Factory Terminal Setup ___________________________________________ 2-5
2.6 Storage _________________________________________________________ 2-5
Section 3 - Theory of Operation
3.0 DMD20 Hardware _________________________________________________ 3-1
3.0.1 DMD20 L-Band/IF Printed Circuit Card _______________________________ 3-1
3.0.2 DMD20 Baseband Processing Printed Circuit Card______________________ 3-2
3.0.3 Enhanced Interface Printed Circuit Card ______________________________ 3-3
3.1 DMD20 Functional Block Diagram ____________________________________ 3-3
3.1.1 Front Panel_____________________________________________________ 3-4
3.1.2 Baseband Processing ____________________________________________ 3-4
3.1.3 Tx Baseband Processing__________________________________________ 3-4
3.1.4 Rx Baseband Processing__________________________________________ 3-5

Table of Contents DMD20/DMD20 LBST Universal Satellite Modem
viii TM103 - Rev. 2.5
3.1.5 Monitor & Control (M&C) Subsystem_________________________________ 3-5
3.1.5.1 Remote/Terminal Port___________________________________________ 3-6
3.1.5.2 Async Port____________________________________________________ 3-6
3.1.5.3 Ethernet Port__________________________________________________ 3-6
3.1.5.4 Clock________________________________________________________ 3-6
3.2 Earth Station to Earth Station Communications Port ______________________ 3-6
3.3 Terrestrial Loopback _______________________________________________ 3-6
3.4 Modem Status____________________________________________________ 3-6
3.5 Baseband Processor Card __________________________________________ 3-7
3.5.1 Baseband Processing ____________________________________________ 3-7
3.6 DMD20 Clocking Options __________________________________________ 3-10
3.6.1 SCTE: Serial Clock Transmit External_______________________________ 3-10
3.6.2 SCT: Serial Clock Transmit _______________________________________ 3-11
3.6.4 EXT CLK: External Clock_________________________________________ 3-11
3.6.5 BNC EXC: BNC External Clock ____________________________________ 3-11
3.6.6 IDI: Insert Data In_______________________________________________ 3-11
3.6.7 SCR: Serial Clock Receive _______________________________________ 3-11
3.6.8 EXT IF REF: External IF Reference_________________________________ 3-11
3.7 Transmit Timing _________________________________________________ 3-12
3.7.1 EXT CLK as TX Clock Source (RS-422 or V.35 Interface) _______________ 3-12
3.7.2 SCT or SCTE__________________________________________________ 3-12
3.7.3 G.703 Interface ________________________________________________ 3-12
3.7.4 Ethernet Data Interface (Optional)__________________________________ 3-12
3.8 Receive Timing __________________________________________________ 3-12
3.8.1 Ethernet Data Interface (Optional)__________________________________ 3-13
3.9 Loop Timing ____________________________________________________ 3-13
3.9.1 Transmit (RS-422 or V.35 Interface) ________________________________ 3-13
3.9.2 G.703 Interface or Asymmetrical Data Rates__________________________ 3-13
3.9.3 Receive ______________________________________________________ 3-13
3.10 Drop and Insert (D&I) ____________________________________________ 3-13
3.10.1 Drop Only____________________________________________________ 3-15
3.10.2 Insert Only ___________________________________________________ 3-15
3.11 Mode Selection _________________________________________________ 3-16
3.11.1 PCM-30 _____________________________________________________ 3-16
3.11.2 PCM-30C ____________________________________________________ 3-16

DMD20/DMD20 LBST Universal Satellite Modem Table of Contents
TM103 – Rev. 2.5 ix
3.11.3 PCM-31 _____________________________________________________ 3-17
3.11.4 PCM-31C ____________________________________________________ 3-17
3.11.5 T1-D4/T1-D4-S________________________________________________ 3-17
3.11.6 T1-ESF/T1-ESF-S _____________________________________________ 3-17
3.12 Multidestinational Systems ________________________________________ 3-17
3.13 Drop and Insert Mapping__________________________________________ 3-18
3.14 Reed-Solomon Codec____________________________________________ 3-20
3.14.1 Reed-Solomon Operation in the DMD20 ____________________________ 3-21
3.14.2 Reed-Solomon Code Rate_______________________________________ 3-21
3.14.3 Interleaving___________________________________________________ 3-21
3.15 DMD20 Automatic Uplink Power Control (AUPC Operation) ______________ 3-22
3.16 Asynchronous Overhead Operation (Framing/Multiplexer Capability) _______ 3-24
3.17 Standard IBS Mode______________________________________________ 3-25
3.18 Asynchronous Multiplexer Mode ___________________________________ 3-26
3.19 ESC Backward Alarms ___________________________________________ 3-26
3.19.1 To Disable the ESC Backward Alarms______________________________ 3-27
3.20 Satellite Control Channel (SCC) ____________________________________ 3-27
3.20.1 SCC Framing Structure _________________________________________ 3-27
3.20.2 Aggregate Data Rate ___________________________________________ 3-28
3.20.3 Overhead Rate Comparison _____________________________________ 3-28
3.20.4 Actual Overhead Rate Calculation_________________________________ 3-29
3.21 SCC Overhead Channel Setup_____________________________________ 3-30
3.22 Locating the DMD2050 ID Code Operational Procedure _________________ 3-31
Section 4 - User Interfaces
4.0 User Interfaces ___________________________________________________ 4-1
4.1 Front Panel User Interface __________________________________________ 4-1
4.1.1 LCD Front Panel Display __________________________________________ 4-2
4.1.2 Cursor Control Arrow Keys ________________________________________ 4-2
4.1.3 Numeric Keypad_________________________________________________ 4-2
4.1.4 Front Panel LED Indicators ________________________________________ 4-3
4.2 Parameter Setup__________________________________________________ 4-3
4.3 Front Panel Control Screen Menus____________________________________ 4-4
4.3.1 Main Menus ____________________________________________________ 4-4
4.3.2 Modulator Menu Options and Parameters_____________________________ 4-5

Table of Contents DMD20/DMD20 LBST Universal Satellite Modem
x TM103 - Rev. 2.5
4.3.3 Demodulator Menu Options and Parameters__________________________ 4-11
4.3.4 Interface Menu Options and Parameters_____________________________ 4-15
4.3.5 AUPC Menu Options and Parameters_______________________________ 4-20
4.3.6 Monitor Menu Options and Parameters______________________________ 4-22
4.3.7 Alarms Menu Options and Parameters ______________________________ 4-24
4.3.8 System Menu Options and Parameters______________________________ 4-33
4.3.9 Test Menu Options and Parameters ________________________________ 4-39
4.4 DMD20 Strap Codes______________________________________________ 4-41
4.5 Sample DMD20 Applications _______________________________________ 4-44
4.5.1 Operational Case Examples ______________________________________ 4-45
4.6 Configuring the DMD20 for Drop and Insert ____________________________ 4-48
4.6.1 Data Rate_____________________________________________________ 4-49
4.6.2 Operational Network Specification__________________________________ 4-49
4.6.3 Terrestrial Framing - Drop Mode/Insert Mode _________________________ 4-50
4.6.3.1 Insert Terrestrial Frame Source __________________________________ 4-50
4.6.4 D&I Sample Configurations and D&I Clock Setup Options _______________ 4-51
4.7 D&I Maps and Map Editing _________________________________________ 4-54
4.8 Configuring the DMD20 to use the Ethernet Data Interface (Optional)________ 4-57
4.8.1 Ethernet Flow Control ___________________________________________ 4-58
4.8.1.1 Half-Duplex Flow Control _______________________________________ 4-58
4.8.1.2 Full-Duplex Flow Control________________________________________ 4-58
4.8.2 Ethernet Daisy Chain____________________________________________ 4-58
4.8.3 Packet Statistics________________________________________________ 4-59
4.9 Terminal Mode Control ____________________________________________ 4-60
4.9.1 Modem Terminal Mode Control ____________________________________ 4-60
4.9.2 Modem Setup for Terminal Mode___________________________________ 4-61
4.10 Terminal Port User Interface_______________________________________ 4-61
4.11 Connecting the Terminal__________________________________________ 4-61
4.12 Terminal Screens _______________________________________________ 4-62
Section 5 - Rear Panel Interfaces
5.0 DMD20 Connections_______________________________________________ 5-1
5.1 Compact Flash ___________________________________________________ 5-2
5.2 Power Input Modules ______________________________________________ 5-2
5.2.1 AC Power Input Module___________________________________________ 5-2

DMD20/DMD20 LBST Universal Satellite Modem Table of Contents
TM103 – Rev. 2.5 xi
5.2.2 DC Power Input/Switch ___________________________________________ 5-3
5.3 DMD20 Chassis Connections (Standard)_______________________________ 5-3
5.3.1 EXT REF (J10)__________________________________________________ 5-3
5.3.2 TX IF (J11)_____________________________________________________ 5-3
5.3.3 TX L-Band IF (J12)_______________________________________________ 5-3
5.3.4 RX IF (J13)_____________________________________________________ 5-3
5.3.5 RX L-Band IF (J14) ______________________________________________ 5-3
5.3.6 ALARM (J15) ___________________________________________________ 5-4
5.3.7 EXT CLK (J16)__________________________________________________ 5-4
5.3.8 ASYNC (J17) ___________________________________________________ 5-5
5.3.9 TERMINAL (J18) ________________________________________________ 5-5
5.3.10 EIA-530 (J19)__________________________________________________ 5-5
5.3.11 REMOTE (J20)_________________________________________________ 5-6
5.3.12 ETHERNET (J21)_______________________________________________ 5-7
5.4 DMD20 LBST Chassis Connections (Standard)__________________________ 5-7
5.4.1 EXT REF (J10)__________________________________________________ 5-7
5.4.2 TX (J11) _______________________________________________________ 5-7
5.4.3 RX (J14)_______________________________________________________ 5-7
5.4.4 ALARM (J15) ___________________________________________________ 5-8
5.4.5 EXT CLK (J16)__________________________________________________ 5-8
5.4.6 ASYNC (J17) ___________________________________________________ 5-9
5.4.7 TERMINAL (J18) ________________________________________________ 5-9
5.4.8 EIA-530 (J19)___________________________________________________ 5-9
5.4.9 REMOTE (J20)_________________________________________________ 5-10
5.4.10 ETHERNET (J21)______________________________________________ 5-10
5.5 IDR/IBS Interface (Optional) ________________________________________ 5-11
5.5.1 ESC ALARM (J1)_______________________________________________ 5-11
5.5.2 64K AUDIO (J2)________________________________________________ 5-12
5.5.3 8K DATA (J3)__________________________________________________ 5-12
5.5.4 G.703 BAL (J4) ________________________________________________ 5-13
5.5.5 SWITCH INTERFACE (J5) _______________________________________ 5-14
5.5.6 SD (DDI) (J6) __________________________________________________ 5-17
5.5.7 DDO (J7) _____________________________________________________ 5-17
5.5.8 IDI (J8) _______________________________________________________ 5-17
5.5.9 SD (IDO) (J9)__________________________________________________ 5-17

Table of Contents DMD20/DMD20 LBST Universal Satellite Modem
xii TM103 - Rev. 2.5
5.6 Ethernet Data Interface (Optional) ___________________________________ 5-17
5.7 High-Speed Serial Interface (HSSI) (Optional) __________________________ 5-17
5.7.1 HSSI (J6) _____________________________________________________ 5-18
5.8 ASI/DVB/M2P Interface (Optional) ___________________________________ 5-19
5.8.1 ASI IN (J1) ____________________________________________________ 5-19
5.8.2 ASI OUT (J2) __________________________________________________ 5-19
5.8.3 DVB/M2P IN (J3) _______________________________________________ 5-19
5.9.4 DVB/M2P OUT (J4) _____________________________________________ 5-21
5.10 Ethernet Data Interface (Optional) __________________________________ 5-23
Section 6 - Maintenance and Troubleshooting
6.0 Periodic Maintenance ______________________________________________ 6-1
6.0.1 Clock Adjustment________________________________________________ 6-1
6.1 Troubleshooting __________________________________________________ 6-1
6.1.1 Alarm Faults____________________________________________________ 6-2
6.1.1.1 Major Tx Alarms _______________________________________________ 6-2
6.1.1.2 Major Rx Alarms _______________________________________________ 6-3
6.1.1.3 Minor Tx Alarms _______________________________________________ 6-3
6.1.1.4 Minor Rx Alarms _______________________________________________ 6-4
6.1.1.5 Drop and Insert Alarms__________________________________________ 6-5
6.1.1.6 Common Major Alarms __________________________________________ 6-5
6.1.2 Alarm Masks ___________________________________________________ 6-6
6.1.2.1 Active Alarms _________________________________________________ 6-6
6.1.2.1.1 Major Alarms ________________________________________________ 6-6
6.1.2.1.2 Minor Alarms ________________________________________________ 6-6
6.1.2.1.3 Common Equipment Faults _____________________________________ 6-6
6.1.2.2 Latched Alarms________________________________________________ 6-6
6.1.2.3 Backward Alarms ______________________________________________ 6-7
6.2 IBS Fault Conditions and Actions _____________________________________ 6-7
Section 7 - Technical Specifications
7.0 Data Rates ______________________________________________________ 7-1
7.1 Modulator _______________________________________________________ 7-1
7.2 Demodulator _____________________________________________________ 7-2
7.3 Plesiochronous Buffer______________________________________________ 7-2

DMD20/DMD20 LBST Universal Satellite Modem Table of Contents
TM103 – Rev. 2.5 xiii
7.4 Monitor and Control________________________________________________ 7-2
7.5 DMD20 Drop and Insert (Optional) ____________________________________ 7-2
7.6 Terrestrial Interfaces_______________________________________________ 7-3
7.7 IDR/ESC Interface (Optional) ________________________________________ 7-3
7.8 IBS/Synchronous Interface (Standard) _________________________________ 7-3
7.9 High-Speed Serial Interface (HSSI) ___________________________________ 7-3
7.10 ASI ___________________________________________________________ 7-3
7.11 DVB/M2P ______________________________________________________ 7-3
7.12 Ethernet Data Interface (Optional) ___________________________________ 7-3
7.13 Environmental___________________________________________________ 7-3
7.14 Physical________________________________________________________ 7-3
7.15 DMD20 Data Rate Limits __________________________________________ 7-4
7.15.1 Non-DVB _____________________________________________________ 7-4
7.15.2 DVB _________________________________________________________ 7-5
7.16 DMD20/DMD20 LBST BER Specifications_____________________________ 7-7
7.16.1 BER Performance (Viterbi)________________________________________ 7-7
7.16.2 BER Performance (Sequential) ____________________________________ 7-8
7.16.3 BER Performance (Viterbi with Reed-Solomon) _______________________ 7-9
7.16.4 BER Performance (Turbo) _______________________________________ 7-10
7.16.5 BER Performance (8PSK Trellis)__________________________________ 7-11
7.16.6 BER Performance (8PSK Turbo)__________________________________ 7-12
7.16.7 BER Performance (16QAM Viterbi) ________________________________ 7-13
7.16.8 BER Performance (16QAM Viterbi with Reed-Solomon)________________ 7-14
7.16.9 BER Performance (16QAM Turbo) ________________________________ 7-15
7.16.10 BER Performance ((O)QPSK Turbo)______________________________ 7-16
7.16.11 BER Performance (8PSK Turbo)_________________________________ 7-17
7.16.12 BER Performance (16QAM Turbo) _______________________________ 7-18
7.16.13 Input Level __________________________________________________ 7-23
7.16.14 ACG Output Voltage __________________________________________ 7-24
Appendix A - Product Options
A.0 Hardware Options_________________________________________________ A-1
A.0.1 G.703/IDR ESC Interface _________________________________________ A-1
A.0.2 Turbo Card_____________________________________________________ A-1
A.0.3 Internal High Stability_____________________________________________ A-1

Table of Contents DMD20/DMD20 LBST Universal Satellite Modem
xiv TM103 - Rev. 2.5
A.0.4 DC Input Prime Power____________________________________________ A-1
A.0.5 ASI/RS-422 Parallel______________________________________________ A-1
A.0.6 ASI/LVDS Parallel _______________________________________________ A-1
A.0.7 HSSI _________________________________________________________ A-1
A.0.8 Ethernet Data Interface ___________________________________________ A-1
A.0.9 Sequential Interface______________________________________________ A-1
A.0.10 AS/5167 Super Card (Variable Reed-Solomon) _______________________ A-2
A.0.11 Custom Reed-Solomon __________________________________________ A-2
A.1 Customized Options _______________________________________________ A-2
Appendix B - Front Panel Upgrade Procedure
B.0 Introduction______________________________________________________ B-1
B.1 Required Equipment_______________________________________________ B-1
B.2 Upgrade Procedure _______________________________________________ B-1
B.3 Demonstration Procedure___________________________________________ B-3
B.3.3 Running in Demonstration Mode____________________________________ B-5
B.3.4 Canceling Demonstration Mode ____________________________________ B-6
Appendix C - Carrier Control
C.0 States __________________________________________________________C-1
C.1 Carrier Off_______________________________________________________C-1
C.2 Carrier On_______________________________________________________C-1
C.3 Carrier Auto _____________________________________________________C-1
C.4 Carrier VSat _____________________________________________________C-1
C.5 Carrier RTS _____________________________________________________C-2
Glossary ___________________________________________________________G-1

DMD20/DMD20 LBST Universal Satellite Modem Table of Contents
TM103 – Rev. 2.5 xv

DMD20/DMD20 LBST Universal Satellite Modem Introduction
TM103 – Rev. 2.5 1-1
Introduction 1
This chapter provides an overview of the DMD20/DMD20 LBST Universal Satellite Modem. The
DMD20 will be referred to in this manual as “the standard unit”; and the DMD20 LBST, referred to
in this manual as the “LBST”. When describing the DMD20 or DMD20 LBST interchangeably,
they may be referred to as “the DMD20”, “the modem”, or “the unit”.
Unless specifically noted, references to the DMD20 include the
DMD20 LBST.
1.0 Overview
The Radyne DMD20 Universal Satellite Modem (Figure 1-1) offers the best features of a
sophisticated programmable IBS/IDR and Closed Network Modem, at an affordable price.
Figure 1-1. DMD20 Universal Satellite Modem Front Panel
This versatile equipment package combines unsurpassed performance with numerous user-
friendly Front Panel Programmable Functions. The DMD20 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 at the Front Panel. 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 at the Front Panel by earth station operations
personnel.
The modem operates at all standard IBS and IDR Data Rates up to 8.448 Mbps. Selection of any
data rate is provided over the range of 2.4 Kbps to 20 Mbps in 1 bps steps.
For applications requiring system redundancy, the DMD20 Modem may be used with the Radyne
RCS11 1:1 Redundancy Switch or the RCS20 M:N (N < 9) Redundancy Switch. An Internal
Engineering Service Channel Unit is available to provide voice, data, and alarms for Intelsat IDR
applications.

Introduction DMD20/DMD20 LBST Universal Satellite Modem
1-2 TM103 - Rev. 2.5
A full range of Industry Standard Interfaces is available for the DMD20. Interface types are
selectable from V.35, RS-232, RS-422/-530, ITU G.703, HSSI, ASI, and DVB/M2P.
The DMD20 LBST (Figure 1-2) offers additional features that are not included in the standard
DMD20 Modem. The features included in DMD20 LBST serves as an interface between the
indoor unit (DMD20 LBST) and the outdoor units (consisting of the BUC and LNB). The output
frequency of the LBST is 950 to 2050 MHz. It does not offer a 70 MHz output that is included in
the standard unit. The LBST can supply voltage and 10 MHz reference to the BUC and LNB via
the IFL Cable. The output from the Tx Port consists of the L-Band output frequency, high-stability
10 MHz reference, and either 24 or 48 Volts to the BUC. The Rx Port consists of the L-Band
input frequency, high-stability 10 MHz reference and 13, 15, 18, and 21 volts. The LBST has the
capability to enable and disable the BUC/LNB voltages and 10 MHz reference via the front panel.
In addition, monitoring features provide verification of system status. The LBST monitors both the
current and the voltage at the output of the Tx and Rx Ports, thus allowing the user to monitor the
status of both the indoor units and outdoor units.
Figure 1-2. DMD20 LBST Universal Satellite Modem Front Panel
1.1 DMD20 Configurations
The DMD20 can be configured in the following different ways:
• features and options that are installed when the unit is ordered
• feature upgrades
• hardware options that the user can install at their own location
• options that are installed to a unit that is sent to a Radyne facility
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. These can be reviewed from the front panel. 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.
1.1.2 Feature Upgrades
Feature Upgrades are a simple and quick way of changing the feature set of an installed modem.
Feature upgrades are how most DMD20 options are implemented. Features may be purchased
at any time by contacting a Radyne Corp. salesperson. Refer to Section 4 and Appendix D, for
information on how upgrade features.

DMD20/DMD20 LBST Universal Satellite Modem Introduction
TM103 – Rev. 2.5 1-3
1.1.3 Hardware Options
Hardware options (refer to Appendix A) are purchased parts that can be installed into the unit at
the customer’s site. A screwdriver is normally the only tool required. Please contact the Radyne
Corp. Customer Service Department for information not limited to availability and to shipping
costs.
Only authorized service personnel should handle and install optional
hardware options.
1.1.4 Radyne Installed Options
Units may also be sent to the Radyne Corp. facility for hardware option installation. Please
contact the Radyne Corp. Customer Service Department for information not limited to availability
and to shipping costs.
1.2 Function Accessibility
All functions can be accessed with a terminal or personal computer via a serial link for complete
remote monitoring and control capability.