Radyne DMD15 User manual

DMD15/DMD15L
IBS/IDR Universal
Satellite Modem
Installation and Operation Manual
TM051 - Rev. 5.8
- NOTICE -
©2005, Radyne, Inc. This manual may not in
whole or in part be copied, reproduced,
translated or reduced to any electronic or
magnetic storage medium without the written
consent of a duly authorized officer of Radyne,
Inc.
Radyne, Inc. •3138 E. Elwood St. •Phoenix, AZ 85034 •[phone] •Fax: [phone]

Latest Software Revision Confirmation
When new features are added to Radyne, Inc. equipment, the control parameters are
appended to the end of the Non-Volatile Section of the Remote Communications
Specification, and status of the features, if any, are added at the end of the Volatile
Section. If a remote M&C queries two pieces of Radyne, Inc. equipment with different
revision software, they could respond with two different sized packets. The remote M&C
MUST make use of the non-volatile count value to index to the start of the Volatile Section.
If the remote M&C is not aware of the newly added features to the product, it should
disregard the parameters at the end of the Non-Volatile Section and index to the start of
the Volatile Section.
Before creating any software based on the information contained in this document,
contact the Radyne, Inc. Customer Service Department at [phone] to find out if the
software revision for that piece of equipment is current and that no new features have
been added since the release of this document.

DMD15/DMD15L IBS/IDR Satellite Modem Warranty Policy
TM051 - Rev. 5.8 iii
Radyne, Inc. Warranty Policy
Warranty and Service
Radyne, Inc. (Seller) warrants the items manufactured and sold by Radyne, Inc. to be free of defects in
material and workmanship for a period of two (2) years from date of shipment Radyne, Inc.’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,
Inc. Radyne, Inc. makes no warranty whatsoever concerning products or accessories not of its
manufacture. Repair, or at Radyne, Inc.’s option, replacement of the Radyne, Inc. 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 Radyne, Inc.’s facility to the
original purchaser and extend for the stated period following the date of shipment. Upon beginning of the
applicable Radyne, Inc. warranty period, all customer’s 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:
5 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, Inc., 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.
5 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, Inc. reserves the right to revise the foregoing list of what is covered under this warranty.
Warranty Replacement and Adjustment
Radyne, Inc. 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 a notice of failure is received by
Radyne, Inc. Under no circumstances shall any warranty exceed the period stated above unless expressly
agreed to in writing by Radyne, Inc.
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 Inc., unless such other
warranties, obligations, or liabilities are expressly agreed to in writing by Radyne, Inc.
All obligations of Radyne, Inc. 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.
In no event shall Radyne, Inc. be liable for Incidental, consequential, special or resulting loss or
damage of any kind howsoever caused.

Warranty Policy DMD15/DMD15L IBS/IDR Satellite Modem
TM051 – Rev. 5.8iv
Radyne, Inc.’s liability for damages shall not exceed the payment, if any, received by Radyne, Inc.
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, Inc., which are inconsistent
or in conflict with the terms of this warranty, shall not be binding upon Radyne, Inc. unless
reduced to writing and approved by an officer of Radyne, Inc.
Warranty Repair Return Procedure
Before a warranty repair can be accomplished, a Repair Authorization must be received. It is at this time
that Radyne, Inc. will authorize the product or part to be returned to the Radyne, Inc. facility or if field repair
will be accomplished. The Repair Authorization may be requested in writing or by calling:
Radyne, Inc.
3138 E. Elwood St.
Phoenix, Arizona 85034 (USA)
ATTN: Customer Support
Phone: [phone]
Fax: [phone]
Any product returned to Radyne, Inc. for examination must be sent prepaid via the means of transportation
indicated as acceptable to Radyne, Inc. 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, Inc. permission to open
and disassemble the product as required for evaluation. In all cases, Radyne, Inc. has sole responsibility
for determining the cause and nature of failure, and Radyne, Inc.’s determination with regard thereto shall
be final.

DMD15/DMD15L IBS/IDR Satellite Modem Record of Revisions
TM051 - Rev. 5.8 v
DMD15/DMD15L IBS/IDR Universal Satellite
Installation and Operation Manual
TM051 – Record of Revisions
Radyne, Inc. is constantly improving its products and therefore the information in this document is
subject to change without prior notice. Radyne, Inc. makes no warranty of any kind with regard to
this material, Including but not limited to the implied warranties of merchantability and fitness for a
particular purpose. No responsibility for any errors or omissions that may pertain to the material
herein is assumed. Radyne, Inc. makes no commitment to update nor to keep current the
information contained in this document. Radyne, Inc. assumes no responsibility for use of any
circuitry other than the circuitry employed in Radyne, Inc. systems and equipment.
Revision
Level Date Reason for Change
1.0 6-18-96 Initial Release.
2.0 9-1-96 Expanded Drop and Insert Section, updated menu trees and descriptions,
added Strap Code Table, updated Fault Menus, added UIO Interface
Settings, updated Specifications Section.
2.1 9-16-96 Added DMD15/DMD15L Terminal Screens (Appendix C), added Modem
Loopback Figures, expanded Principles of Operation Section, added IBS
Conditions and Faults Table, added new Universal Interface Illustrations and
pinout tables.
2.2 11-25-96 Expanded Drop and Insert Data and figures, added BER Curves, added
additional Interface Pinout Tables and descriptions.
3.0 12-16-96 Added Reed-Solomon Menu Tree enhancements, added Clocking Data
Definitions, minor rearrangements and clarifications.
3.1 4-10-97 Added additional Reed-Solomon Data, additional UIM Data, and minor
corrections to pinout tables.
4.0 8-1-99 Added AUPC data, new Menu Screens, L-Band Data, ESC Audio Data and
minor corrections
4.1 7-31-00 Added AGC Output Data on Table 2-5.
5.0 12-14-01 Revised and reformatted entire Technical Manual.
5.1 1-30-02 Removed Ethernet Port section.
5.2 3-5-02 Revised Sections 4.3.2, Mod Data (menu), and 4.3.3, Demod Data (menu).
5.3 6-11-02 Revised Section 1.1.12.
5.4 8-22-02 Revised Sections 7.0 and 7.1.
5.5 8-26-02 Added Modem Status pinouts to Section 5.0.
5.6 9-17-03 Updated user interface, added reacquisition description, updated RLLP.
5.7 7-30-04 Revised RLLP.
5.8 10-15-05 Revised Sections 4.0 & 5.0

DMD15/DMD15L IBS/IDR Satellite Modem
TM051 – Rev. 5.8vi

DMD15/DMD15L IBS/IDR Satellite Modem Table of Contents
TM051 - Rev. 5.8 vii
Table of Contents
Section 1 – Introduction
1.0 Description _____________________________________________________ 1-1
1.1 DMD15/DMD15L Available Options __________________________________ 1-1
1.1.1 Internal High Stability____________________________________________ 1-1
1.1.2 Reed-Solomon Codec ___________________________________________ 1-1
1.1.3 Turbo Codec __________________________________________________ 1-2
1.1.4 Drop and Insert (D&I)____________________________________________ 1-2
1.1.5 8PSK Modulation _______________________________________________ 1-2
1.1.6 OQPSK Modulation _____________________________________________ 1-2
1.1.7 16QAM Modulation______________________________________________ 1-2
1.1.8 Sequential Decoding ____________________________________________ 1-2
1.1.9 Earth Station-to-Earth Station (ES-ES) Communications ________________ 1-2
1.1.10 Analog AGC Voltage ___________________________________________ 1-2
1.1.11 Internal Engineering Service Channel (ESC)_________________________ 1-2
1.1.12 OM73 Compatible _____________________________________________ 1-2
1.1.13 Back Panel Options ____________________________________________ 1-3
1.1.14 Customized Options____________________________________________ 1-3
Section 2 – Installation
2.0 Installation Requirements __________________________________________ 2-1
2.1 Unpacking ______________________________________________________ 2-1
2.2 Removal and Assembly____________________________________________ 2-1
2.3 Mounting Considerations __________________________________________ 2-2
2.4 DMD15/DMD15L Initial Configuration Check ___________________________ 2-2
2.5 Modulator Checkout ______________________________________________ 2-3
2.5.1 Initial Power-Up ________________________________________________ 2-3

Table of Contents DMD15/DMD15L IBS/IDR Satellite Modem
viii TM051 - Rev. 5.8
Section 3 – Operation
3.0 Theory of Operation ______________________________________________ 3-1
3.1 DMD15/DMD15L Functional Block Diagram____________________________ 3-1
3.2 Universal Interface Module (UIM) ____________________________________ 3-3
3.3 Synchronous Interface ____________________________________________ 3-4
3.4 G.703 Interface __________________________________________________ 3-4
3.5 Earth Station to Earth Station (ES-ES) Communications Port ______________ 3-5
(Async Port J9)______________________________________________________ 3-5
3.6 Terrestrial Loopback ______________________________________________ 3-5
3.7 Modem Status___________________________________________________ 3-5
3.8 Baseband Processor Card _________________________________________ 3-8
3.8.1 Baseband Processing ___________________________________________ 3-8
3.8.2 Tx Baseband Processing_________________________________________ 3-8
3.8.3 Rx Baseband Processing_________________________________________ 3-9
3.8.4 Clock Selection ________________________________________________ 3-9
3.9 Monitor & Control (M&C) Subsystem _________________________________ 3-9
3.9.1 Asynchronous Serial Port #1 ______________________________________ 3-9
3.9.2 Serial Port #2 __________________________________________________ 3-9
3.9.3 Serial Port #3 __________________________________________________ 3-9
3.9.4 Front Panel Interface ___________________________________________ 3-10
3.9.5 Clock _______________________________________________________ 3-10
3.9.6 Watchdog Timer_______________________________________________ 3-10
3.9.7 Program Flash ROM ___________________________________________ 3-10
3.9.8 RAM ________________________________________________________ 3-10
3.9.9 Non-Volatile RAM______________________________________________ 3-10
3.10 Universal Modem ______________________________________________ 3-10
3.10.1 Modulator ___________________________________________________ 3-10
3.10.2 Demodulator_________________________________________________ 3-11
3.11 DMD15/DMD15L Clocking Options_________________________________ 3-11
3.11.1 SCTE: Serial Clock Transmit External_____________________________ 3-11
3.11.2 SCT: Serial Clock Transmit _____________________________________ 3-11
3.11.4 EXT EXC: External Clock_______________________________________ 3-11
3.11.5 BNC EXC: BNC External Clock __________________________________ 3-11
3.11.6 BAL EXC: Balanced External Clock_______________________________ 3-11
3.11.7 IDI: Insert Data In_____________________________________________ 3-12

DMD15/DMD15L IBS/IDR Satellite Modem Table of Contents
TM051 - Rev. 5.8 ix
3.11.8 SCR: Serial Clock Receive _____________________________________ 3-12
3.11.9 EXT IF REF: External IF Reference_______________________________ 3-12
3.12 Transmit Timing _______________________________________________ 3-12
3.12.1 EXT CLK as TX Clock Source (RS-422 or V.35 Interface) _____________ 3-12
3.12.2 SCT or SCTE________________________________________________ 3-12
3.12.3 G.703 Interface ______________________________________________ 3-12
3.13 Receive Timing ________________________________________________ 3-12
3.14 Loop Timing __________________________________________________ 3-13
3.14.1 Transmit (RS-422 or V.35 Interface) ______________________________ 3-13
3.14.2 G.703 Interface or Asymmetrical Data Rates _______________________ 3-13
3.14.3 Receive ____________________________________________________ 3-13
3.15 Drop and Insert (D&I) ___________________________________________ 3-13
3.15.1 Drop Only___________________________________________________ 3-15
3.15.2 Insert Only __________________________________________________ 3-15
3.16 Mode Selection ________________________________________________ 3-16
3.16.1 PCM-30 ____________________________________________________ 3-16
3.16.2 PCM-30C ___________________________________________________ 3-16
3.16.3 PCM-31 ____________________________________________________ 3-16
3.16.4 PCM-31C ___________________________________________________ 3-17
3.16.5 T1-D4/T1-D4-S_______________________________________________ 3-17
3.16.6 T1-ESF/ T1-ESF-S____________________________________________ 3-17
3.16.7 SLC-96_____________________________________________________ 3-17
3.17 Multidestinational Systems _______________________________________ 3-17
3.17 Drop and Insert Mapping_________________________________________ 3-18
3.18 Reed-Solomon Codec (Refer to Figures 3-14, 3-15, and Table 3-1) _______ 3-20
3.18.1 Operation in the DMD15/DMD15L ________________________________ 3-20
3.18.2 Reed-Solomon Code Rate______________________________________ 3-20
3.18.3 Interleaving__________________________________________________ 3-20
3.19 DMD15 Automatic Uplink Power Control (AUPC Operation) _____________ 3-22
3.20 DMD15 Asynchronous Overhead Operation__________________________ 3-24
3.20.1 Asynchronous Framing/Multiplexer Capability_______________________ 3-24
3.21 Standard IBS Mode_____________________________________________ 3-26
3.22 Asynchronous Multiplexer Mode __________________________________ 3-26
3.23 ESC Backward Alarms __________________________________________ 3-26
3.23.1 To Disable the ESC Backward Alarms_____________________________ 3-27

Table of Contents DMD15/DMD15L IBS/IDR Satellite Modem
x TM051 - Rev. 5.8
3.24 Reacquisition__________________________________________________ 3-27
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____________________________ 4-4
4.3.3 Demodulator Menu Options and Parameters__________________________ 4-8
4.3.4 Interface Menu Options and Parameters____________________________ 4-11
4.3.5 AUPC Menu Options and Parameters______________________________ 4-14
4.3.6 Monitor Menu Options and Parameters_____________________________ 4-16
4.3.7 Alarms Menu Options and Parameters _____________________________ 4-17
4.3.8 System Menu Options and Parameters_____________________________ 4-24
4.3.9 Test Menu Options and Parameters _______________________________ 4-25
4.4 DMD15/DMD15L Strap Codes _____________________________________ 4-26
4.5 Sample DMD15/DMD15L Applications _______________________________ 4-30
4.5.1 Operational Case Examples _____________________________________ 4-31
4.6 Configuring the DMD15/DMD15L for Drop and Insert ___________________ 4-34
4.6.1 Data Rate____________________________________________________ 4-34
4.6.2 Operational Mode______________________________________________ 4-35
4.6.3 Terrestrial Framing - Drop Mode/Insert Mode ________________________ 4-35
4.6.3.1 Insert Terrestrial Frame Source _________________________________ 4-35
4.6.4 D&I Sample Configurations and D&I Clock Setup Options ______________ 4-36
4.7 D&I Maps and Map Editing ________________________________________ 4-40
4.8 Terminal Mode Control ___________________________________________ 4-43
4.8.1 Modem Terminal Mode Control ___________________________________ 4-43
4.8.2 Modem Setup for Terminal Mode__________________________________ 4-43

DMD15/DMD15L IBS/IDR Satellite Modem Table of Contents
TM051 - Rev. 5.8 xi
Section 5 – Electrical Interfaces
5.0 DMD15/DMD15L Connections ______________________________________ 5-1
5.1 Power Inputs ____________________________________________________ 5-2
5.1.1 AC Power Input Module __________________________________________ 5-2
5.1.2 DC Power Input Module__________________________________________ 5-2
5.2 TX (J1) ________________________________________________________ 5-3
5.3 RX (J2) ________________________________________________________ 5-3
5.4 SD (J3) ________________________________________________________ 5-3
5.5 DDO (J4)_______________________________________________________ 5-3
5.6 IDI EXC (J5) ____________________________________________________ 5-3
5.7 EXT CLK (J5) – Synchronous Interface Only ___________________________ 5-3
5.8 RD (J6) ________________________________________________________ 5-3
5.9 G.703 (J7)______________________________________________________ 5-3
5.10 SYNC DATA (J8) _______________________________________________ 5-4
5.11 ASYNC (J9)____________________________________________________ 5-5
5.11 STATUS (J11)__________________________________________________ 5-6
5.13 TERMINAL (J12)________________________________________________ 5-7
5.14 REMOTE (J13) _________________________________________________ 5-7
5.15 ESC 8K DATA (J15) _____________________________________________ 5-8
5.16 ESC VOICE (J16) _______________________________________________ 5-9
5.17 ESC ALARMS (J17) _____________________________________________ 5-9
5.18 SWITCH (J18)_________________________________________________ 5-10
Section 6 – Maintenance
6.0 Periodic Maintenance _____________________________________________ 6-1
6.1 Troubleshooting _________________________________________________ 6-1
6.2 DMD15/DMD15L Fault Philosophy ___________________________________ 6-1
6.2.1 Alarm Masks __________________________________________________ 6-2
6.2.2 Active Alarms __________________________________________________ 6-2
6.2.2.1 Major Alarms_________________________________________________ 6-2
6.2.2.2 Minor Alarms_________________________________________________ 6-2
6.2.2.3 Latched Alarms_______________________________________________ 6-2
6.3 DMD15/DMD15L Fault Tree Matrices_________________________________ 6-2
6.3.1 Interpreting the Matrices _________________________________________ 6-4
6.3.2 IBS Fault Conditions and Actions___________________________________ 6-4

Table of Contents DMD15/DMD15L IBS/IDR Satellite Modem
xii TM051 - Rev. 5.8
Section 7 – Technical Specifications
7.0 Modulator Specifications___________________________________________ 7-1
7.1 Demodulator Specifications ________________________________________ 7-1
7.2 Plesiochronous Buffer_____________________________________________ 7-2
7.3 Monitor and Control_______________________________________________ 7-2
7.4 DMD15/DMD15L Drop and Insert (Optional) ___________________________ 7-2
7.5 Terrestrial Interfaces______________________________________________ 7-3
7.6 Universal Interface _______________________________________________ 7-3
7.7 Environmental ___________________________________________________ 7-3
7.8 Physical________________________________________________________ 7-3
7.9 DMD15 Data Rate Limits __________________________________________ 7-4
7.10 DMD15 BER Specifications________________________________________ 7-5
Section 8 – Appendices
Appendix A – Reed-Solomon Codes _____________________________________ A-1
Glossary __________________________________________________________G-1

DMD15/DMD15L IBS/IDR Satellite Modem Introduction
TM051 - Rev. 5.8 1-1
Section 1 – Introduction
1.0 Description
The Radyn, Inc. DMD15/DMD15L Satellite Modem (Figure 1-1) offers the best features of a
sophisticated programmable IBS/IDR and Closed Network Modem, at an affordable price.
This versatile equipment package combines unsurpassed performance with numerous user-
friendly Front Panel Programmable Functions. The DMD15/DMD15L 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. Additionally, all functions can be accessed with a
terminal or personal computer via a serial link for complete remote monitoring and control
capability.
The DMD15/DMD15L 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 9.6 Kbps to 10 Mbps in 1 bps steps.
For applications requiring system redundancy, the DMD15/DMD15L Modem may be used with the
Radyne , Inc. RCS11 1:1 Redundancy Switch or the RCS20 M:N (N < 9) Redundancy Switch. An
optional Internal Engineering Service Channel Unit is available to provide voice, data, and alarms
for Intelsat IDR applications.
A full range of Industry Standard Interfaces is available for the DMD15/DMD15L. Interface types
are selectable from V.35, RS-232, RS-422/449 and ITU G.703.
Figure 1-1. DMD15/DMD15L Universal Satellite Modem Front Panel
1.1 DMD15/DMD15L Available Options
A wide range of options is available for the DMD15/DMD15L Satellite Modem.
1.1.1 Internal High Stability
The DMD15/DMD15L can be equipped with a 1x10-7 or better Stability Frequency Reference as
an add-on enhancement.
1.1.2 Reed-Solomon Codec
The DMD15/DMD15L can be equipped with a Reed-Solomon (R-S) Outer Codec with an
interleaver as an optional add-on enhancement. The encoder and decoder are completely
independent and meet the IESS-308/309/310 specification. Once prepped, this option can be
installed in the field by installing five ICs into existing sockets. The DMD15/DMD15L must be
prepped for this option.
Note: Custom Reed-Solomon codes are also available.

Introduction DMD15/DMD15L IBS/IDR Satellite Modem
1-2 TM051 – Rev. 5.8
1.1.3 Turbo Codec
The DMD15/DMD15L can be equipped with an optional Turbo Codec Outer Code. This option
must be installed at the factory.
1.1.4 Drop and Insert (D&I)
The DMD15/DMD15L can be equipped with a D&I Interface as an add-on enhancement. This
option can be added in the field by installing one IC into an existing socket. The D&I Functions
are completely independent and can be programmed for n x 64 blocks for either a T1 or E1 Data
Stream.
1.1.5 8PSK Modulation
The DMD15/DMD15L can be equipped with 8PSK Modulation/Demodulation capability as an add-
on option. The 8PSK Option can be added by installing 2 ICs into existing sockets.
1.1.6 OQPSK Modulation
The DMD15/DMD15L can be equipped with an OQPSK modulation/demodulation capability as an
add-on option. The option can be added in the field by installing one IC into an existing socket.
1.1.7 16QAM Modulation
The DMD15/DMD15L can be equipped with a 16QAM Modulation/Demodulation capability as an
add-on option. The 16QAM option can be added by installing 2 ICs into existing sockets.
1.1.8 Sequential Decoding
The DMD15/DMD15L can be equipped with a sequential decoding option that can be installed as
an add-on option. The DMD15/DMD15L must be prepped for this option in the factory. Once
prepped, the option can be added by installing 3 ICs into existing sockets. Sequential
Encoding/Decoding can operate with 1/2, 3/4, and 7/8 Rates, up to data rates of 2.048 Mbps.
1.1.9 Earth Station-to-Earth Station (ES-ES) Communications
The DMD15/DMD15L can be equipped with an asynchronous overhead channel capability as an
add-on option. The option can be added in the field by installing 2 ICs into existing sockets. The
overhead channel is proportional to the data rate (2,400 baud per 64 KB) up to a maximum of
19.2 Kbaud.
1.1.10 Analog AGC Voltage
The DMD15/DMD15L can be equipped at the factory to produce an analog voltage equivalent to
its AGC for use in antenna controllers.
1.1.11 Internal Engineering Service Channel (ESC)
The DMD15/DMD15L can be equipped with an internal ESC. This unit is a card on the Universal
Interface Module (UIM). The DMD15/DMD15L can be updated with an ESC capable UIM in the
field with no other changes required.
1.1.12 OM73 Compatible

DMD15/DMD15L IBS/IDR Satellite Modem Introduction
TM051 - Rev. 5.8 1-3
The DMD15/DMD15L can be equipped with an optional OM73 scrambler at the customer’s
request. This option must be prepped at the factory. Once installed, selection of the OM73
Scrambler/Descrambler will automatically invert the baseband data on the Modulator/Demodulator
respectively. This configuration is required to run compatible with the OM73 Modem.
1.1.13 Back Panel Options
The DMD15/DMD15L has several optional Interface Modules available (refer to Figures 5-1
through 5-5). These include:
Universal Interface Module w/ ESC
G.703 Interface Module w/ESC
G.703 Interface Module
Universal Interface Module
Synchronous Interface Module
These Interface Modules are available with AC or DC Power Input Modules and the following
Transmit and Receive schemes.
IF Transmit and Receive
L-Band Transmit and Receive
IF Transmit, L-Band Receive
IF Receive Only
L-Band Receive Only
1.1.14 Customized Options
The DMD15/DMD15L may be customized for specific customer requirements. Most modifications
or customization can be accomplished by means of firmware/software modifications.
The following are examples of the types of customization available to the user:
Customized Data Rates.
Customized Scrambler/Descramblers.
Customized Overhead Framing Structures.
Customized Modulation Formats.
Customized Uses for the Earth Station-to-Earth Station (ES-ES) Overhead Channel.
Contact the Radyne , Inc. Customer Service or Sales Department at [phone] for all
requests.

DMD15/DMD15L IBS/IDR Satellite Modem Installation
TM051 - Rev. 5.8 2-1
Section 2 – Installation
2.0 Installation Requirements
The DMD15/DMD15L Modem is designed to be installed within any standard 19-inch wide
equipment cabinet or rack, and requires one rack unit (RU) of mounting space (1.75 inches)
vertically and 21 inches of depth. Including cabling, a minimum of 23 inches of rack depth is
required. The rear panel of the DMD15/DMD15L is designed to have power enter from the right
and IF Cabling enter from the left when viewed from the rear of the modem. Data and control
cabling can enter from either side although they are closer to the right. The unit can be placed on
a table or suitable surface if required.
There are no user-serviceable parts or configuration settings located inside
the DMD15/DMD15L Chassis. There is a potential shock hazard internally at
the power supply module. DO NOT open the DMD15/DMD15L Chassis
under any circumstances.
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 DMD15/DMD15L configuration settings are
unknown, where incorrect settings could disrupt existing communications
traffic.
2.1 Unpacking
The DMD15/DMD15L Modem was carefully packaged to avoid damage and should arrive
complete with the following items for proper installation:
1. DMD15/DMD15L Modem Unit.
2. Power Cord, 6-foot with applicable AC Connector.
3. Installation and Operation Manual.
2.2 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 DMD15/DMD15L Modem Unit is shipped fully assembled and does not require removal of the
covers for any purpose in installation. The only replaceable assembly in the unit is the Universal
Interface Module (UIM).

Installation DMD15/DMD15L IBS/IDR Satellite Modem
2-2 TM051 – Rev. 5.8
Always ensure that power is removed from the DMD15/DMD15L before
removing or installing a UIM. Failure to do so may cause damage to the
equipment.
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, 1.0 A.
2.3 Mounting Considerations
When mounted in an equipment rack, adequate ventilation must be provided. The ambient
temperature in the rack should preferably 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
modem units may be stacked one on top of the other to a maximum of 10 consecutive units
before providing one RU of space for airflow. Modem units should not be placed immediately
above a high heat or EMF Generator to ensure the output signal integrity and proper receive
operation.
Do not mount the DMD15/DMD15L in an unprotected outdoor location where there is direct
contact with rain, snow, wind or sun. The modem is designed for indoor applications only. The
only tools required for rack mounting the DMD15/DMD15L is a set of four rack-mounting screws
and the appropriate screwdriver. Rack mounting brackets are an integral part of the cast front
bezel of the unit and are not removable.
2.4 DMD15/DMD15L Initial Configuration Check
The DMD15/DMD15L is shipped from the factory with preset factory defaults. Upon initial power-
up, a user check should be performed to verify the shipped modem configuration. Refer to
Section 4, User Interfaces to locate and verify that the following configuration settings are correct:
The DMD15/DMD15L Interface Type (V.35, RS-422, RS-232, G.703, etc.)
MUST be selected from the Front Panel BEFORE the mating connectors are
installed. Failure to do so may cause damage to the Universal Interface
Module. Power up the DMD15/DMD15L, select the appropriate interface
type, and then install the mating connectors.
Note: Transmit (Tx) and Receive (Rx) Interface types are dependent upon the customer’s
order.

DMD15/DMD15L IBS/IDR Satellite Modem Installation
TM051 - Rev. 5.8 2-3
Standard DMD15/DMD15L Factory Configuration Settings
Modulator:
Data Rate: 2.048 Mbps
Mode: Closed Network
Forward Error Correction: 1/2 Rate Viterbi
Modulation: QPSK
Frequency: 70.000000 MHz
Note: The above modem configuration can be set by implementing Strap Code 26.
Refer to Table 3-1 for an explanation and tabular listing of available Strap Codes.
Modulator Output Power: -20 dBm
Demodulator:
Data Rate: 2.048 Mbps
Mode: Closed Network
Forward Error Correction: 1/2 Rate Viterbi
Frequency: 70.000000 MHz
To lock up the modem, enter ‘IF Loopback Enable’ under the Test menu, or connect a Loopback
Cable from J1 to J2 on the rear panel of the modem.
2.5 Modulator Checkout
The following descriptions assume that the DMD15/DMD15L is installed in a suitable location with
prime AC power and supporting equipment available.
2.5.1 Initial Power-Up
Before initial power up of the DMD15/DMD15L, 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 settings could disrupt the existing
communications traffic. New units from the factory are normally shipped in
a default configuration which includes setting the transmit carrier off.
Turn on the unit by placing the Rear Panel Switch (located above the power entry connector) to
the ‘ON’ position. Upon initial and subsequent power-ups, the DMD15/DMD15L 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
will illuminate.