Radyne DM240XR User manual

MN-DM240XR Revision 13
IMPORTANT NOTE: The information contained in this document supersedes all previously
published information regarding this product. This manual is subject tochange without prior notice.
DM240XR
High-Speed Digital Modulator
Installation and Operation Manual

Copyright © 2012 Comtech EF Data. All rights reserved. Printed in the USA.
Comtech EF Data, 2114 West 7th Street, Tempe, Arizona 85281 USA, 480.333.2200, FAX: [phone]
DM240XR
High-Speed Digital Modulator
Installation and Operation Manual
PartNumber MN-DM240XR
Revision 13

Blank Page

iii
Table of Contents
CHAPTER 1. INTRODUCTION..................................................................................1–1
1.1 Description.............................................................................................................................1–1
CHAPTER 2. INSTALLATION...................................................................................2–1
2.1 Installation Requirements......................................................................................................2–1
2.2 Unpacking ..............................................................................................................................2–2
2.3 Removal and Assembly..........................................................................................................2–2
2.4 Mounting Considerations ......................................................................................................2–2
2.5 Modulator Checkout..............................................................................................................2–3
2.5.1 Initial Power-Up...............................................................................................................2–3
CHAPTER 3. THEORY OF OPERATION ..................................................................3–1
3.1 Theory of Operation ..............................................................................................................3–1
3.2 DVB-S Operation...................................................................................................................3–1
3.3 DVB-S2-BS-NBC Operation..................................................................................................3–2
CHAPTER 4. USER INTERFACES............................................................................4–1
4.1 User Interfaces .......................................................................................................................4–1
4.2 Front Panel User Interface....................................................................................................4–1
4.2.1 Front Panel LCD Display .................................................................................................4–2
4.2.2 Front Panel LED Indicators..............................................................................................4–2
4.2.3 Front Panel Keypad..........................................................................................................4–2
4.2.4 Parameter Setup ...............................................................................................................4–3
4.3 Front Panel Control Screen Menus.......................................................................................4–5
4.3.1 Main Menus .....................................................................................................................4–5
4.3.2 Modulator Menu Options and Parameters.........................................................................4–6
4.3.3 Interface Menu Options and Parameters............................................................................4–9
4.3.3.1 Plug-In Interface Card (PIIC)......................................................................................4–10
4.3.3.2 Ethernet Interface (J1) ................................................................................................4–12
4.3.4 RF Switch Menu Options and Parameters....................................................................... 4–20
4.3.5 Monitor Menu Options and Parameters...........................................................................4–20
4.3.6 Alarms Menu Options and Parameters............................................................................4–20
4.3.7 System Menu Options and Parameters............................................................................4–22
4.3.8 Test Menu Options and Parameters.................................................................................4–30

Table of Contents Revision 13
DM240XR High-Speed Digital Modulator MN-DM240XR
iv
4.4 Remote Port User Interface.................................................................................................4–30
4.4.1 Protocol Structure...........................................................................................................4–31
4.4.2 Protocol Wrapper ...........................................................................................................4–31
4.4.3 Frame Description and Bus Handshaking .......................................................................4–34
4.4.4 Global Response Operational Codes............................................................................... 4–34
4.4.5 Collision Avoidance.......................................................................................................4–36
4.4.6 Software Compatibility...................................................................................................4–37
4.4.7 RLLP Summary .............................................................................................................4–38
4.4.8 DM240XR Opcode Command Set..................................................................................4–38
4.5 Ethernet Port User Interface...............................................................................................4–39
4.6 Simple Network Management Protocol (SNMP)................................................................4–39
4.7 The Management Information Base (MIB).........................................................................4–39
4.7.1 Directory {internet 1} 1.3.6.1.1 ....................................................................................4–39
4.7.2 Mgmt {internet 2} 1.3.6.1.2.........................................................................................4–39
4.7.3 Experimental {internet 3} 1.3.6.1.3 ...............................................................................4–39
4.7.4 Private {internet 4} 1.3.6.1.4 ........................................................................................4–40
4.8 Terminal Port User Interface ..............................................................................................4–41
4.8.1 Connecting the Terminal ................................................................................................4–42
4.8.2 Terminal Screens............................................................................................................4–42
CHAPTER 5. REAR PANEL INTERFACES ..............................................................5–1
5.1 DM240XR Connections .........................................................................................................5–1
5.2 AC Power ...............................................................................................................................5–3
5.3 Compact Flash Interface (J5) ................................................................................................5–3
5.3.1 Feature Upgrade...............................................................................................................5–3
5.3.2 Firmware Update..............................................................................................................5–3
5.3.3 Custom Configuration......................................................................................................5–3
5.4 Ethernet Interface (J6)...........................................................................................................5–3
5.5 External Reference (Input)....................................................................................................5–4
5.6 Remote Port (I/O) ..................................................................................................................5–4
5.7 Terminal Port (I/O)................................................................................................................5–4
5.8 Alarm Port .............................................................................................................................5–5
5.9 IF Output Port (J10 & J11)...................................................................................................5–5
5.9.1 Output Monitor Port (J9)..................................................................................................5–5
5.10 RF Redundancy Switch Control (J2) ....................................................................................5–6
5.11 Built in ASI/Advanced ASI Interface (J7).............................................................................5–6

Table of Contents Revision 13
DM240XR High-Speed Digital Modulator MN-DM240XR
v
5.12 Plug-In Interface Cards (PIICs)............................................................................................5–7
5.12.1 ASI PIIC..........................................................................................................................5–7
5.12.1.1 ASI (Asynchronous Serial Interface).............................................................................5–7
5.12.1.2 AASI (Advanced Asynchronous Serial Interface) .........................................................5–7
5.12.2 ASI Monitor.....................................................................................................................5–8
5.12.3 Parallel RS-422 Interface..................................................................................................5–8
5.12.3.1 M2P (Parallel, RS-422) ................................................................................................5–8
5.12.3.2 DVB (Parallel, RS-422)................................................................................................5–9
5.12.4 Parallel LVDS Interface .................................................................................................5–10
5.12.5 HSSI Interface................................................................................................................5–10
5.12.6 Ethernet 100/1000 Base-T Interface................................................................................5–11
5.12.7 EIA-530 /RS-422 Serial Interface...................................................................................5–11
5.12.8 G.703 Interface (Contact factory for availability)............................................................5–12
CHAPTER 6. MAINTENANCE AND TROUBLESHOOTING .....................................6–1
6.1 Periodic Maintenance ............................................................................................................6–1
CHAPTER 7. TECHNICAL SPECIFICATIONS..........................................................7–1
7.1 Introduction ...........................................................................................................................7–1
7.2 IF Specification ......................................................................................................................7–1
7.3 Baseband Specification..........................................................................................................7–2
7.3.1 DVB-S.............................................................................................................................7–2
7.3.2 DVB-S2-CCM (CCM - Normative).................................................................................7–2
7.3.3 DVB-S2-ACM (Normative Features with Single Transports streams)...............................7–3
7.4 Interface Types Available (PIIC) ..........................................................................................7–4
7.5 Monitor and Control..............................................................................................................7–4
7.6 Environmental .......................................................................................................................7–4
7.7 Physical ..................................................................................................................................7–4
7.8 Options ...................................................................................................................................7–5
7.9 DVB-S Series Configuration..................................................................................................7–5
7.9.1 DVB-S2 Series Configuration ..........................................................................................7–5
7.10 Data Rates (DVB-S)...............................................................................................................7–5
7.10.1 Data Rates (DVB-S2).......................................................................................................7–7
CHAPTER 8. SNMP...................................................................................................8–1
CHAPTER 9. REMOTE OPERATIONS .....................................................................9–1
9.1 DM240XR Opcode Command Set........................................................................................9–1

Table of Contents Revision 13
DM240XR High-Speed Digital Modulator MN-DM240XR
vi
9.2 Modulator Command Set ......................................................................................................9–1
9.3 Detailed Command Descriptions...........................................................................................9–3
CHAPTER 10. WEB BROWSER...............................................................................10–1
10.1 Web Browser User Interface ...............................................................................................10–1
10.2 Configuring Your PC...........................................................................................................10–2
10.2.1 LED Indicators...............................................................................................................10–3
10.3 GUI Screen Menus...............................................................................................................10–4
10.3.1 Introduction Menu..........................................................................................................10–5
10.3.1.1 Login Screen ..............................................................................................................10–6
10.3.2 Password Setup ..............................................................................................................10–7
10.3.3 IP and Application Administration..................................................................................10–9
10.3.4 Monitor and Control Menu........................................................................................... 10–14
10.3.4.1 Transmit Menu......................................................................................................... 10–14
10.3.4.2 Interface Menu .........................................................................................................10–16
10.3.4.3 RFSWITCH Menu ................................................................................................... 10–17
10.3.4.4 Monitor Menu ..........................................................................................................10–17
10.3.4.5 Alarms Menu............................................................................................................10–19
10.3.4.6 System Menu............................................................................................................ 10–20
10.3.4.7 Test Menu ................................................................................................................ 10–22
APPENDIX A. FRONT PANEL UPGRADE PROCEDURE.........................................A–1
A.1 Introduction ..........................................................................................................................A–1
A.2 Required Equipment............................................................................................................. A–1
A.3 Upgrade Procedure............................................................................................................... A–1
A.4 Demonstration Procedure..................................................................................................... A–3
A.4.1 Running in Demonstration Mode..................................................................................... A–5
A.4.2 Canceling Demonstration Mode ...................................................................................... A–6
APPENDIX B. TCP/IP ETHERNET SETUP................................................................B–1
B.1 Introduction ...........................................................................................................................B–1
B.2 TCP/IP Network Configuration............................................................................................B–1
B.3 Network Configuration Summary.........................................................................................B–3
B.4 Ethernet Test..........................................................................................................................B–3
B.4.1 Connecting the Modem Ethernet Cable to a Network Link................................................B–3
B.4.2 Connecting the Modem Ethernet Cable Directly to a Computer (without a Network) ........B–3
B.4.3 Testing the Ethernet connection using the Ping Program (Optional)..................................B–5

Table of Contents Revision 13
DM240XR High-Speed Digital Modulator MN-DM240XR
vii
APPENDIX C. WEB BROWSER QUICK SETUP GUIDE ...........................................C–1
C.1 Introduction ..........................................................................................................................C–1
C.2 Web Users Configuration ..................................................................................................... C–1
C.2.1 Change Web User Name ..................................................................................................C–3
C.2.2 Change Authentication Password......................................................................................C–3
C.2.3 Change Access Rights......................................................................................................C–4
C.3 Modem Web Site...................................................................................................................C–4
C.4 Web Page Appearance..........................................................................................................C–5
APPENDIX D. AUTOEQ™ INTERFACE OPERATION GUIDE..................................D–1
D.1 Introduction ..........................................................................................................................D–1
D.2 Applicable Documents.......................................................................................................... D–1
D.3 AutoEQ™ PIIC Interface Theory of Operation.................................................................. D–2
D.4 AutoEQ™Menu Options and Parameters............................................................................D–4
D.5 AutoEQ™Back Channel Menu Options and Parameters....................................................D–7
D.6 AutoEQ Backchannel Setup ................................................................................................. D–8
D.7 AutoEQ™ Operation Procedure........................................................................................ D–10
D.8 Reference Acquisition Calibration (Optional Step)........................................................... D–10
D.9 Equalizer Calibration ......................................................................................................... D–11
D.10 Equalizer Modes ................................................................................................................. D–12
D.11 AutoEQ™ Remote Operation ............................................................................................ D–13
D.12 Additional Features ............................................................................................................ D–14
D.12.1 AutoEQ™ Status Indicator............................................................................................ D–14
D.12.2 LNB Power Connector .................................................................................................. D–14

Table of Contents Revision 13
DM240XR High-Speed Digital Modulator MN-DM240XR
viii
Blank Page

i
PREFACE
About this Manual
This manual describes the installation and operation for the Radyne DM240XR. This is an
informational document intended for the persons responsible for the operation and maintenance
of the DM204XR.
Conventions and References
Patents and Trademarks
See all of Comtech EF Data's Patents and Patents Pending at http://patents.comtechefdata.com.
Comtech EF Data acknowledges that all trademarks are the property of the trademark owners.
Related Documents
The following documents are referred to in this manual:
•EN300-421 and EN301-210 ETSI
•ETSI EN302-307
•INTELSAT Earth Station Standards IESS-308, -309, -310, and -315
•EUTELSAT SMS
Cautions and Warnings
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 situation that, if not avoided,
could result in death or serious injury.
IMPORTANT

DM240XR Revision 13
Preface MN-DM240XR
ii
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.

DM240XR Revision 13
Preface MN-DM240XR
iii
Warranty Policy
Comtech EF Data products are warranted against defects in material and workmanship for a specific period from the
date of shipment, and this period varies by product. In most cases, the warranty period is two years. 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 warranty or a 90 day extended warranty, whichever is longer. Contact
Comtech EF Data for the warranty period specific to the product purchased.
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.
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.

DM240XR Revision 13
Preface MN-DM240XR
iv
Customer Support
Support Business Hours – Monday Through Friday – 8:00 a.m. to 5:00 p.m. (MST):
Comtech EF Data & Radyne
Advanced VSAT Solutions
Satellite Modems
Modem Accessories
Amplifiers
Converters
Transceivers
Terminals
Tel:[phone]
Fax:[phone]
Email: [e-mail]
IP-Enabled Satellite Modems
IP-Based Modem Accessories
Encapsulators, Receivers, Filtering & Encryption
turboIP® Performance Enhancement Proxies (PEP)
SkyWire™ MDX420 Satellite Network Gateway
Tel: [phone]
Fax: [phone]
Email: [e-mail]
Vipersat Network Products
IP-Enabled Satellite Modems used in conjunction
with VMS
Advanced VSAT Solutions used with VMS
Tel: [phone] – select option #2
Fax: [phone]
Email: [e-mail]
After Hours and Weekends:
Comtech EF Data – Tel: [phone]
Radyne – Tel: [phone]

MN-DM240XR– Revision 13 1–1
Chapter 1. INTRODUCTION
This chapter provides an overview of the DM240XR High-Speed Digital Modulator. The
DM240XR will be referred to in this manual as “the DM240XR”, “the modulator”, or “the unit”.
1.1 Description
The New Standard in Digital Modulator Performance
Radyne’s DM240XR family of High-Speed Modulators is the ideal choice to meet the exacting
standards of High Data-Rate Video, Internet and Fiber Restoral Satellite Applications. The
DM240XR offers various options that comply to the international standards, supporting both
DVB-S and DVB-S2 specifications. With a variety of frequency options and Plug-In Data
Interfaces (PIIC), it provides greater flexibility for changing and upgrading the unit the required
application.
The DVB-S Network specification complies with both EN300-421 and EN301-210 ETSI
specifications. The DM240XR supports FEC rates of BPSK, QPSK, 8PSK and 16QAM
applications with symbol rates up to 68 Msps.
The DVB-S2 Network specification complies with the next generation DVB open standard
supported by ETSI EN302-307. At the core of this standard is a powerful Bose-Chaudhuri-
Hocquenghem BCH encoder and concatenated Low-Density Parity Check (LDPC). The DVB-S2
FEC rates supported are BPSK, QPSK, 8PSK and 16APSK with symbol rates up to 45Msps.
Figure 1-1 DM240XR
The powerful new onboard Monitor and Control (M&C) processor has the unique capability to
download firmware and enhance features from a field-changeable Flash Card. Offering
unprecedented flexibility, this feature represents a new level of Radyne outstanding Customer
Support. Additionally, features are added to the installed equipment base with extreme ease,
allowing the equipment to expand with changes in service while lowering initial installation
budgets.The Modulator offers a frequency-agile IF Output from 50 to 90, 100 to 180 MHz
(70/140), or 950 to 2050 MHz (L-Band) in 1 Hz steps. Variable data rates from 1 Mbps to 238
Mbps can be set in 1 bps steps.
The DM240XR, AutoEQ™ option supports SCPC equalization of Group Delay and Amplitude.
Installing the AutoEQ™ PIIC Interface allows the ability to compensate for the overall system
Group Delay and Amplitude Flatness over the satellite by pre-distorting the Uplink Carrier,

DM240XR High-Speed Digital Modulator Introduction
MN-DM240XR– Revision 13 1–2
eliminating the need for external Group Delay/Amplitude Equalizers. AutoEQ™ will
automatically generate the proprietary profile for the DM240XR to pre-distort the modulator,
resulting in Amplitude and Group Delay equalization over the Satellite Link. The AutoEQTM will
operate over the full transponder from a symbol rate of 10.1 Msps to 45 Msps.
Additional features include the choice of remotely interfacing through one of three onboard
connections: 10/100 Base-T Ethernet, RS-485, RS-232 or Web Browser. The familiar Radyne
Front Panel (Figure 1-1) offers push-button control of all features and a backlit LCD display.
Menus are specifically designed for ease of use and quick online operation as well as changes in
all modulator configurations.
The DM240XR supports optional 1:1 Redundancy for data, IF or both offering superior system
reliability based on customer needs and applications.
Redundancy Options support include:
•RCS11: 1 RU Chassis that supports redundancy for both IF (70/140MHz or L-band) and
supports various data interfaces.
•RRS11: 1RU Chassis supports redundancy for either 70/140 MHz or L-band. Includes
easy access to monitor ports for online and offline monitoring via the front panel. Power
and control logic is supplied by a rear panel connector on the DM240XR.
•STS11: Small package design that supports redundancy for either 70/140 MHz or L-
band. Includes easy access to monitor ports for online and offline monitoring via the
front panel. Power and control logic is supplied by a rear panel connector on the
DM240XR
•Data Redundancy: The DM240XR PIIC interfaces allows for data redundancy when dual
interfaces are installed. The modulator can satisfy the user's applications when the
system requires monitoring of the redundant data paths. Simply configure the redundant
interface and the modulator will monitor the integrity of the data paths and switch in the
event data is corrupted on either path.

MN-DM240XR– Revision 13 2–1
Chapter 2. Installation
This section provides unpacking and installation instructions, and a description of external
connections and backward alarm information.
2.1 Installation Requirements
The DM240 can be installed within any standard 19-inch equipment cabinet or rack, and requires
1 RU mounting space (1.75 inches) vertically and 17 inches of depth. Including cabling, a
minimum of 20-inches of rack depth is required. The rear panel of the DM240XR is designed to
have power enter from the left and IF cabling enter from the right when viewed from the rear of
the unit. Data and control cabling can enter from either side although they are closer to the
center. The unit can be placed on a table or suitable surface if required.
WARNING
PROPER GROUNDING PROTECTION: During installation and setup, the
user must ensure that the unit is properly grounded. The equipment shall
be connected to the protective earth connection through the end use
protective earth protection.
In addition, the IF input and output coax cable shielding must be properly
terminated to the chassis/unit ground.
WARNING
There are no user-serviceable parts or configuration settings located
inside the DM240 Chassis. There is a potential shock hazard internally at
the power supply module. DO NOT open the DM240 Chassis under any
circumstances.

DM240XR High-Speed Digital Modulator Installation
MN-DM240XR– Revision 13 2–2
CAUTION
Before initially applying power to the unit, it is a good idea to disconnect
the transmit output from the operating ground station equipment. This is
especially true if the current DM240XR configuration settings are
unknown, where incorrect settings could disrupt existing
communications traffic.
2.2 Unpacking
The DM240XR Modulator was carefully packaged to avoid damage and should arrive complete
with the following items for proper installation:
DM240XR Unit.
Compact Flash Card. Must be installed.
Power Cord, 6-foot with applicable AC connector.
Installation and Operation Manual.
2.3 Removal and Assembly
Carefully unpack the unit and ensure that all of the above items are in the carton. If the Prime AC
power available at the installation site requires a different power cord/AC connector, then
arrangements to receive the proper device will be necessary before proceeding with the
installation.
The DM240XR modulator is shipped fully assembled. It does not require removal of the covers
for any purpose in installation. The only replaceable assembly in the unit is the data interface and
is not intended to be accomplished in the field. Should the power cable AC connector be of the
wrong type for the installation, either the cable or the power connector end should be replaced.
The power supply itself is designed for universal application using from 100 to 240 VAC, 50 to
60 Hz, < 40 W.
2.4 Mounting Considerations
When mounted in an equipment rack, adequate ventilation must be provided. The ambient
temperature in the rack should be between 10°and 35°C, and held constant for best equipment
operation. The air available to the rack should be clean and relatively dry. The DM240XR units
may be stacked one on top of the other up to a maximum of 10 consecutive units before providing
a 1 RU space for airflow.
Do not mount the DM240XR in an unprotected outdoor location where there is direct contact
with rain, snow, wind or sun. The DM240XR is designed for indoor applications only.
The only tools required for rack mounting the DM240XR is a set of four rack mounting screws
and an appropriate screwdriver. Rack mount brackets are an integral part of the cast front bezel
of the unit and are not removable.

DM240XR High-Speed Digital Modulator Installation
MN-DM240XR– Revision 13 2–3
Shielded cables with the shield terminated to the conductive backshells are required in order to
meet EMC directives. Cables with insulation flammability ratings of 94 VO or better are required
in order to meet low voltage directives.
2.5 Modulator Checkout
The following descriptions assume that the DM240XR is installed in a suitable location with
prime AC power and supporting equipment available.
2.5.1 Initial Power-Up
CAUTION
Before initial power up of the DM240XR, it is a good idea to disconnect
the transmit output from the operating ground station equipment. This is
especially true if the current modulator configuration settings are
unknown, where incorrect setting could disrupt existing communications
traffic. New units from the factory are normally shipped in a default
configuration which includes setting the transmit carrier off.
Turn the unit ‘ON’ by placing the rear panel switch (above the power entry connector) to the
‘ON’ position. Upon initial and subsequent power-ups, the DM240XR microprocessor will test
itself and several of its components before beginning its main Monitor/Control program. These
power-up diagnostics show no results if successful. If a failure is detected, the Fault LED is
illuminated.
The initial field checkout of the DM240XR can be accomplished from the front panel, Terminal
Port, Remote Port, or Ethernet Port.

DM240XR High-Speed Digital Modulator Installation
MN-DM240XR– Revision 13 2–4
Notes: