Microwave Radio Communications SCM4000 Product manual

Manual Part No. 400509-1
Rev. A February 2006
Technical Reference
Manual
Single Carrier Modem
SCM4000

Notices iSCM4000 Technical Reference Manual
Notices
About This Manual
Part number 400509-1
Revision A - February 2006
The information in the manual applies to the Microwave Radio
Communications (MRC) SCM4000 Single Carrier Modem.
Copyright
The information in this book may be reproduced by the
purchaser to the extent needed for their organization. No part of
this material may be modified in any way, or published for resale,
without the express written authorization of Microwave Radio
Communications.
© 2006 Microwave Radio Communications
Microwave Radio Communications
101 Billerica Avenue - Bldg. 6
North Billerica, MA 01862-1256 USA
TEL: [phone]
FAX: [phone]
Printed in U.S.A.
Proprietary Material
The information and design contained within this manual was
originated by and is the property of Microwave Radio
Communications. Microwave Radio Communications reserves
all patent proprietary design, manufacturing, reproduction use,
and sales rights thereto, and to any articles disclosed therein,
except to the extent rights are expressly granted to others. The
foregoing does not apply to vendor proprietary parts.
To allow for the introduction of design improvements,
specifications are subject to change without notice.
Quality Certification
Microwave Radio Communications is certified to ISO 9001:2000.
Authorized EU representative: Vislink PLC.

Notices iiSCM4000 Technical Reference Manual
Conventions
Pay special attention to information marked in one of the
following ways:
WARNING Follow WARNINGS closely to prevent
personal injury or death.
CAUTION Follow CAUTIONS to prevent damage to
the equipment.
Note Notes provide additional information to assist you
in using and maintaining the equipment.
On-Line Viewing
Text displayed as blue contains a hypertext link. Click on the
hypertext to jump to that destination. Click on the
blue destination to return.
Viewing this manual on-line
requires Adobe Acrobat,
version 4.0 or above.
Click on this icon to download your
FREE copy of Adobe Acrobat
Reader.
Symbols Used
The following symbols are used on the equipment:
Symbol Meaning
WARNING: General Warning. Risk of Danger
WARNING: Risk of Electric Shock
CAUTION: Electrostatic Discharge. Possible
Damage to Equipment
OR
Fuse - Identifies fuses or their location.
Frame or Chassis Ground - Identifies the frame or
chassis terminal.
Earth Ground - Identifies the earth Ground Terminal
Protective Earth Ground - Identifies any terminal
which is intended for connection to an external
conductor for protection against electric shock in
case of a fault, or the terminal on a protective earth
electrode.

Notices iiiSCM4000 Technical Reference Manual
Warranty Information
Products Manufactured by MRC:
a. Products manufactured by MRC are warranted against
defects in material and workmanship for a period of two (2) years
from date of delivery, as evidenced by MRC's packing slip or
other transportation receipt (unless otherwise noted).
b. MRC's sole responsibility under this warranty will be to either
repair or replace, at its option, any component which fails during
the applicable warranty period because of a defect in material or
workmanship, provided Buyer has promptly reported same to
MRC in writing. All replaced products and parts will become
MRC's property.
c. MRC will honor the warranty at the repair facility designated
by MRC. It is Buyer's responsibility to return, at its expense, the
allegedly defective product to MRC. Buyer must obtain a Return
Material Authorization (RMA) number and shipping instructions
from MRC prior to returning any product under warranty.
Transportation charges for the return of the product to Buyer will
be paid by MRC within the United States. For all other locations,
the warranty excludes all costs of shipping, customs clearance,
and other related charges. If MRC determines that the product is
not defective within the terms of this warranty, Buyer will pay
MRC all costs of handling, transportation, and repairs at the then
prevailing repair rates.
d. All the above warranties are contingent upon proper use of
the product. These warranties will not apply (1) if adjustment,
repair, or product or parts replacement is required because of
accident, unusual physical, electrical or electromagnetic stress,
neglect, misuse, failure of electric power, environmental controls,
transportation, failure to maintain properly or otherwise in
accordance with MRC specifications, or abuses other than
ordinary use; (2) if the product has been modified by Buyer or
has been repaired or altered outside MRC's repair facility, unless
MRC specifically authorizes such repairs or alterations in each
instance; or (3) where MRC serial numbers, warranty data, or
quality assurance decals have been removed or altered.
e. No person, including any dealer, agent or representative of
MRC is authorized to assume for MRC any other liability on its
behalf except as set forth herein. If any payment is due MRC for
services performed hereunder, it will be subject to the same
payment terms as the original purchase.
Products Manufactured By Others:
For products not manufactured by MRC, the original
manufacturer's or licensor's warranty will be assigned to Buyer to
the extent permitted by the manufacturer or licensor and is in lieu
of any other warranty, expressed or implied. For warranty
information on a specific product, a written request should be
made to MRC.
All Products:
THE FOREGOING WARRANTIES AND REMEDIES ARE
EXCLUSIVE AND ARE IN LIEU OF ALL OTHER EXPRESS OR
IMPLIED WARRANTIES, OBLIGATIONS, AND LIABILITIES ON
THE PART OF MRC. EXCEPT FOR THE EXPRESS
WARRANTIES STATED HEREIN, MRC DISCLAIMS ALL
WARRANTIES ON PRODUCTS FURNISHED HEREUNDER,
INCLUDING, WITHOUT LIMITATION, ALL IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE. MRC WILL HAVE NO
RESPONSIBILITY FOR ANY PARTICULAR APPLICATION
MADE OF ANY EQUIPMENT.
Any description of equipment, whether in writing or made orally
by MRC or its agents, specification sheets, models, bulletins,

Notices ivSCM4000 Technical Reference Manual
drawings, or similar materials used in connection with Buyer's
order are for the sole purpose of identifying the equipment and
will not be construed as an express warranty. Any suggestions
by MRC or its agents regarding use, application, or suitability of
the equipment will not be construed as an express warranty. No
warranties may be implied from any course of dealing or usage
of trade. Buyer agrees that the exclusion of all warranties, other
than those expressly provided herein, is reasonable.

Contents
Contents-1SCM4000 Technical Reference Manual
Notices - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - i
About This Manual - - - - - - - - - - - - - - - - - - - - - - - - i
Copyright- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - i
Proprietary Material - - - - - - - - - - - - - - - - - - - - - - - i
Quality Certification - - - - - - - - - - - - - - - - - - - - - - - i
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - i
Conventions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ii
On-Line Viewing- - - - - - - - - - - - - - - - - - - - - - - - - - ii
Symbols Used- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ii
Warranty Information - - - - - - - - - - - - - - - - - - - - - - - - - iii
Products Manufactured by MRC: - - - - - - - - - - - - - - iii
Products Manufactured By Others:- - - - - - - - - - - - - iii
All Products: - - - - - - - - - - - - - - - - - - - - - - - - - - - - iii
Introduction - - - - - - - - - - - - - - - - - - - - - - - - - 1-1
Chapter Overview - - - - - - - - - - - - - - - - - - - - - - - - - 1-1
How to Use This Manual - - - - - - - - - - - - - - - - - - - - 1-1
What This Manual Covers - - - - - - - - - - - - - - - - - - - 1-1
How They’re Organized - - - - - - - - - - - - - - - - - - - - - 1-1
For Whom It’s Written - - - - - - - - - - - - - - - - - - - - - - 1-2
Related Documents - - - - - - - - - - - - - - - - - - - - - - - - 1-2
Ordering Documentation - - - - - - - - - - - - - - - - - - - - 1-2
Calling for Service - - - - - - - - - - - - - - - - - - - - - - - - - 1-3
Supported Repairs - - - - - - - - - - - - - - - - - - - - - - - - 1-3
Tell Us What You Think! - - - - - - - - - - - - - - - - - - - - 1-3
Product Description- - - - - - - - - - - - - - - - - - - 2-1
Chapter Overview - - - - - - - - - - - - - - - - - - - - - - - - - 2-1
System Description - - - - - - - - - - - - - - - - - - - - - - - - 2-1
Configuration Options - - - - - - - - - - - - - - - - - - - - 2-2
Configuration Descriptions - - - - - - - - - - - - - - - - 2-2
Power Options - - - - - - - - - - - - - - - - - - - - - - - - - 2-5
Mounting and Deployment Options - - - - - - - - - - 2-5
System Integration - - - - - - - - - - - - - - - - - - - - - - 2-5
SCM4000 Configurations - - - - - - - - - - - - - - - - - - - - 2-5
SCM4000 Modulator - - - - - - - - - - - - - - - - - - - - - 2-6
SCM4000 Demodulator - - - - - - - - - - - - - - - - - - - 2-6
SCM4000 Modulator/Demodulator - - - - - - - - - - - 2-7
SCM4000 Modulator/Encoder- - - - - - - - - - - - - - - 2-7
SCM4000 Demodulator/Decoder - - - - - - - - - - - - 2-8
For More Information - - - - - - - - - - - - - - - - - - - - - - - 2-8
Routine Operation - - - - - - - - - - - - - - - - - - - - 3-1
Chapter Overview - - - - - - - - - - - - - - - - - - - - - - - - - 3-1
Overview of Controls, Indicators and Connectors - - - 3-1
SCM4000 Controls and Indicators- - - - - - - - - - - - 3-1
SCM4000 Modulator Connectors - - - - - - - - - - - - 3-3
SCM4000 Demodulator Connectors - - - - - - - - - - 3-4
SCM4000 Modulator/Demodulator Connectors - - 3-6
SCM4000 Modulator/Encoder Connectors - - - - - - 3-7
SCM4000 Demodulator/Decoder Connectors- - - - 3-9
Preparing for Operation - - - - - - - - - - - - - - - - - - - - 3-10
Fixed or Mobile Installation- - - - - - - - - - - - - - - - 3-11
Powering the SCM4000 - - - - - - - - - - - - - - - - - - 3-11
Using the SCM4000 Screens - - - - - - - - - - - - - - - - 3-11
Overview - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-12
Menu Configurations - - - - - - - - - - - - - - - - - - - - 3-16
Main Screen - - - - - - - - - - - - - - - - - - - - - - - - - - 3-17
Cursors - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-17
Preset Selection - - - - - - - - - - - - - - - - - - - - - - - 3-18
Accessing the Menus- - - - - - - - - - - - - - - - - - - - 3-19
SCM4000 Monitor/Change Operations - - - - - - - - - - 3-19
SCM4000 Modulator Menu Operations- - - - - - - - - - 3-20
Monitor/Change Symbol Rate- - - - - - - - - - - - - - 3-21
Monitor/Change Modulation Type - - - - - - - - - - - 3-23

Contents-2SCM4000 Technical Reference Manual
Monitor/Change ASI Enable - - - - - - - - - - - - - 3-25
Monitor/Change ASI Bit Rate - - - - - - - - - - - - - - 3-27
Monitor/Change DS3/E3 Enable - - - - - - - - - - - 3-29
Monitor/Change DS3/E3 Line Standard Setting - 3-31
Monitor/Change DS3/E3 Line Equalizer Setting- 3-33
Monitor DS3/E3 Bit Rate - - - - - - - - - - - - - - - - - 3-36
Monitor/Change Ethernet Enable - - - - - - - - - - - 3-37
Monitor/Change Ethernet Bit Rate - - - - - - - - - - 3-40
Monitor/Change Ethernet LIU Bit Rate - - - - - - - 3-42
Monitor/Change RS232/RS485 Serial Enable - - 3-44
Monitor/Change RS232/RS485 Baud Rate - - - - 3-46
Monitor RS232/RS485 Bit Rate - - - - - - - - - - - - 3-49
Monitor/Change SMPTE Enable - - - - - - - - - - - 3-50
Monitor/Change SMPTE Mode - - - - - - - - - - - - 3-52
Monitor SMPTE Bit Rate - - - - - - - - - - - - - - - - - 3-54
Monitor/Change T1/E1 Enable- - - - - - - - - - - - - 3-56
Monitor/Change T1/E1 Line Standard- - - - - - - - 3-58
Monitor/Change T1/E1 Termination - - - - - - - - - 3-60
Monitor/Change T1/E1 Line Coding State - - - - - 3-62
Monitor/Change T1/E1 Receiver Gain - - - - - - - 3-65
Monitor T1/E1 Bit Rate - - - - - - - - - - - - - - - - - - 3-67
Monitor/Change IF Level - - - - - - - - - - - - - - - - - 3-68
Monitor/Change Spectrum Inverter State - - - - - 3-70
Monitor/Change CW Tone State - - - - - - - - - - - 3-72
Monitor/Change PRBS State - - - - - - - - - - - - - - 3-74
SCM4000 Demodulator Menu Operations - - - - - - - 3-76
Monitor/Change Symbol Rate Settings - - - - - - - 3-77
Monitor/Change Modulation Type Settings - - - - 3-79
Monitor Signal-to-Noise Ratio - - - - - - - - - - - - - 3-80
Monitor EVM - - - - - - - - - - - - - - - - - - - - - - - - - 3-82
Monitor/Change ASI Bit Rate Settings - - - - - - - 3-83
Monitor/Change DS3/E3 Line Standard Setting - 3-86
Monitor/Change DS3/E3 Line Equalizer Setting- 3-88
Monitor DS3/E3 Bit Rate - - - - - - - - - - - - - - - - - 3-90
Monitor/Change Ethernet Bit Rate- - - - - - - - - - - 3-92
Monitor/Change Ethernet LIU Rate - - - - - - - - - - 3-94
Monitor/Change RS232/RS485 Baud Rate - - - - 3-97
Monitor RS232/RS485 Bit Rate - - - - - - - - - - - - 3-99
Monitor SMPTE Bit Rate - - - - - - - - - - - - - - - - 3-100
Monitor/Change T1/E1 Line Standard - - - - - - - 3-102
Monitor/Change T1/E1 Line Coding - - - - - - - - 3-104
Monitor/Change T1/E1 Line Build Out - - - - - - - 3-106
Monitor T1/E1 Bit Rate- - - - - - - - - - - - - - - - - - 3-108
Monitor/Change Line Equalizer- - - - - - - - - - - - 3-110
Monitor/Change PRBS State - - - - - - - - - - - - - 3-112
Monitor PRBS Bit Error Rate - - - - - - - - - - - - - 3-114
Reset PRBS - - - - - - - - - - - - - - - - - - - - - - - - - 3-116
SCM4000 Modulator/Demodulator Menu Operations 3-117
SCM4000 Modulator/Encoder Menu Operations - - 3-118
MPEG Encoder Menu Options - - - - - - - - - - - - 3-118
Monitor/Change Color Bars Settings - - - - - - - - 3-118
Monitor/Change Chroma Settings - - - - - - - - - - 3-120
Monitor/Change BISS Settings - - - - - - - - - - - - 3-122
Monitor/Change Delay Setting - - - - - - - - - - - - 3-123
Monitor/Change Bit Rate Settings - - - - - - - - - - 3-125
Monitor/Change Video Setting - - - - - - - - - - - - 3-127
Monitor/Change Audio A Settings - - - - - - - - - - 3-128
Monitor/Change Audio B Settings - - - - - - - - - - 3-131
Monitor Network Name - - - - - - - - - - - - - - - - - 3-133
Monitor Service Name - - - - - - - - - - - - - - - - - - 3-134
SCM4000 MPEG Demodulator/Decoder Menu Operations 3-
135
MPEG Decoder Menu Options - - - - - - - - - - - - 3-136
Monitor/Change Color Bars Settings - - - - - - - - 3-136
Monitor/Change Audio Output Settings - - - - - - 3-138
Monitor/Change Generator Lock Settings - - - - 3-139
Monitor/Change NTSC Pedestal Settings - - - - 3-141
Monitor/Change BISS Settings - - - - - - - - - - - - 3-143

Contents-3SCM4000 Technical Reference Manual
Monitor Audio A Status - - - - - - - - - - - - - - - - - 3-145
Monitor Audio B Status - - - - - - - - - - - - - - - - - 3-146
Monitor Video Status - - - - - - - - - - - - - - - - - - 3-148
Monitor Packet Errors - - - - - - - - - - - - - - - - - - 3-149
Monitor Service Name - - - - - - - - - - - - - - - - - 3-151
SCM4000 System Menu Operations - - - - - - - - - - 3-152
Monitor/Change Active Preset - - - - - - - - - - - - 3-153
Save Preset Settings - - - - - - - - - - - - - - - - - - 3-154
Recall Preset Settings- - - - - - - - - - - - - - - - - - 3-155
Monitor Active Errors - - - - - - - - - - - - - - - - - - 3-156
Monitor/Clear Error Log- - - - - - - - - - - - - - - - - 3-157
Monitor System Information - - - - - - - - - - - - - - 3-158
Perform System Reset - - - - - - - - - - - - - - - - - 3-160
Troubleshooting - - - - - - - - - - - - - - - - - - - - - 4-1
Chapter Overview - - - - - - - - - - - - - - - - - - - - - - - - - 4-1
Status LEDs - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-1
Error Codes - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-2
Operational Problems - - - - - - - - - - - - - - - - - - - - - 4-11
Link Setup Guide- - - - - - - - - - - - - - - - - - - - - - - - - 4-15
Installation- - - - - - - - - - - - - - - - - - - - - - - - - - 5-1
Chapter Overview - - - - - - - - - - - - - - - - - - - - - - - - - 5-1
Unpacking - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-1
Initial Inspection - - - - - - - - - - - - - - - - - - - - - - - - - - 5-1
Damage in Shipment - - - - - - - - - - - - - - - - - - - - - - - 5-1
Installing the SCM4000 - - - - - - - - - - - - - - - - - - - - - 5-2
Equipment Rack- - - - - - - - - - - - - - - - - - - - - - - - 5-2
Mounting the SCM4000 - - - - - - - - - - - - - - - - - - 5-2
Ventilation - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-3
Moisture - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-3
Cabling - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-3
Power Connections - - - - - - - - - - - - - - - - - - - - - - - - 5-4
Power Requirements - - - - - - - - - - - - - - - - - - - - 5-4
Power Supply and Distribution - - - - - - - - - - - - - - 5-4
Panel Power Connections - - - - - - - - - - - - - - - - - 5-5
Additional Powering Notes - - - - - - - - - - - - - - - - - 5-5
Grounding - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-5
Audio Connections - - - - - - - - - - - - - - - - - - - - - - - - - 5-6
Panel Connections - - - - - - - - - - - - - - - - - - - - - - 5-6
Audio Inputs and Outputs- - - - - - - - - - - - - - - - - - 5-8
Audio Configurations - - - - - - - - - - - - - - - - - - - - - 5-8
Signal Connections - - - - - - - - - - - - - - - - - - - - - - - - 5-8
Front Panel RS-232 Connector- - - - - - - - - - - - - 5-18
SCM4000 Rear Panel Connectors - - - - - - - - - - 5-18
Cable Assemblies - - - - - - - - - - - - - - - - - - - - - - - - 5-22
Powering Up - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-26
Checks before power-up - - - - - - - - - - - - - - - - - 5-26
Initial power-up - - - - - - - - - - - - - - - - - - - - - - - - 5-26
Product Modifications - - - - - - - - - - - - - - - - - - - - - - 5-26
Repair - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 6-1
Chapter Overview - - - - - - - - - - - - - - - - - - - - - - - - - 6-1
Supported Repairs - - - - - - - - - - - - - - - - - - - - - - - - - 6-1
Calling for Service - - - - - - - - - - - - - - - - - - - - - - - - - 6-1
Replacement Parts - - - - - - - - - - - - - - - - - - - 7-1
Chapter Overview - - - - - - - - - - - - - - - - - - - - - - - - - 7-1
External Cables - - - - - - - - - - - - - - - - - - - - - - - - - - - 7-1
Power Fuses - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 7-1
Theory of Operation - - - - - - - - - - - - - - - - - - 8-1
Chapter Overview - - - - - - - - - - - - - - - - - - - - - - - - - 8-1
System Architecture - - - - - - - - - - - - - - - - - - - - - - - - 8-1
Operation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8-2
Description - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8-2
Interfaces - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8-2
Data Mux - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8-2
SCM4000 Modulator/Demodulator Modem Configuration
8-3
SCM4000 Modulator Description - - - - - - - - - - - - 8-3
SCM4000 Demodulator Description - - - - - - - - - - 8-4
SCM4000 Modulator/Encoder- - - - - - - - - - - - - - - 8-4

Contents-4SCM4000 Technical Reference Manual
SCM4000 Demodulator/Decoder - - - - - - - - - - - - 8-5
Glossary - - - - - - - - - - - - - - - - - - - - - - - - - - - A-1
Preset Settings Worksheets- - - - - - - - - - - - - B-1
Appendix Overview - - - - - - - - - - - - - - - - - - - - - - - - B-1
Symbol Rate Calculations - - - - - - - - - - - - - - C-1
Appendix Overview - - - - - - - - - - - - - - - - - - - - - - - - C-1
Bit Rates and Symbol Rates - - - - - - - - - - - - - - - - - - C-1
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1
Introduction 1-1SCM4000 Operator’s Guide
Introduction
1.1 Chapter Overview
This chapter will introduce you to the Technical Reference
Manual: what it covers, how it’s organized, and for whom it’s
written.
1.2 How to Use This Manual
This manual was prepared to be viewed on a Windows-based
PC. A pdf file for this manual is provided on the CD ROM
delivered with each SCM4000. The CD ROM contains pdf files
for the Operator’s Guide, the Technical Reference Manual, and
the Quick Reference Cards. Hardcopies of the Operator’s
Guide, the Technical Reference Manual, and the Quick
Reference Cards are also delivered with each SCM4000.
Viewing of this manual on-line requires Adobe Acrobat, Version
4.0 or above. Click on the following icon to download your FREE
copy of Adobe Acrobat Reader.
When viewing this manual on-line, text displayed as blue contains a
hypertext link. Click on the blue hypertext link to jump to that
destination. If the destination link is also blue, click on the blue
destination link to return.
1.3 What This Manual Covers
This manual describes how to operate and maintain the
SCM4000 Single Carrier Modem.
Your SCM4000 will consist of one of the following configurations:
• SCM4000 Modulator
• SCM4000 Demodulator
• SCM4000 Modulator/Demodulator
• SCM4000 Modulator/Encoder
• SCM4000 Demodulator/Decoder.
This manual provides coverage for each of these various
configurations.
Your SCM4000 can be rack-mounted in a standard 19-inch (48.3
cm) rack for fixed site or mobile operations and can be ordered
to operate on either AC or DC power.
1.4 How They’re Organized
The manuals for the SCM4000 are organized as follows:
Chapter Operator’s
Guide
Technical
Reference
Manual
Introduction ✔ ✔
Product Description ✔ ✔
Routine Operation ✔ ✔
Troubleshooting ✔ ✔
Installation ✔

Introduction 1-2SCM4000 Operator’s Guide
Note The Technical Reference Manual contains
everything in the Operator’s Guide, plus additional
technical content.
1.5 For Whom It’s Written
This manual is intended for use by qualified installers and
service personnel. Users of this manual should already be
familiar with basic concepts of radio, video, and audio.
1.6 Related Documents
• SCM4000 Single Carrier Modem Operator’s Guide
(part no. 400508-1)
• SCM4000 Single Carrier Modem Modulator Option Quick
Reference Card (part no. 400510-1)
• SCM4000 Single Carrier Modem Demodulator Option
Quick Reference Card (part no. 400510-2)
Repair ✔
Replacement Parts ✔
Theory of Operation ✔
Appendix A - Glossary ✔ ✔
Appendix B - Preset
Settings Worksheet ✔
Appendix C - SCM4000
Symbol Rate
Calculations
✔
• SCM4000 Single Carrier Modem MPEG Encoder Option
Quick Reference Card (part no. 400510-3)
• SCM4000 Single Carrier Modem MPEG Decoder Option
Quick Reference Card (part no. 400510-4)
1.7 Ordering Documentation
Any of the above manuals may be ordered by contacting MRC
Customer Service:
Business Hours: Monday - Thursday
8:00 AM - 7:00 PM Eastern Time (US)
(0800 - 1900 hrs US ET)
Friday
8:00 AM - 5:00 PM Eastern Time (US)
(0800 - 1700 hrs US ET)
Telephone: [phone]
978-671-5700
Fax: [phone]
When contacting Customer Service, please have the following
information available:
• Model number and serial number of the unit. This is
located on a label on the bottom of each unit.
• Approximate purchase date.
• Firmware revisions, which appear on the SCM4000
alphanumeric display System Menus > System Info
menu screen.

Introduction 1-3SCM4000 Operator’s Guide
1.8 Calling for Service
MRC Technical Support is available 24 hours a day, 7 days a
week. During regular business hours you can reach our expert
staff directly. After hours, your call will be forwarded to the on-call
Technical Support specialist.
Business Hours: Monday
8:00 AM - 5:00PM Eastern Time (US)
(0800 - 1700 hrs US ET)
Tuesday - Friday
8:00 AM - 7:00PM Eastern Time (US)
(0800 - 1900 hrs US ET)
Telephone: [phone]
978-671-5700
Fax: [phone]
Email: [e-mail]
When contacting Technical Support, please have the following
information available:
• Model number and serial number of the unit. This is
located on a label on the bottom of each unit.
• Approximate purchase date.
• Firmware revisions, which appear on the SCM4000
alphanumeric display System Menus > System Info
menu screen.
1.9 Supported Repairs
The SCM4000 Single Carrier Modem is designed to be compact,
rugged, and reliable.
The SCM4000 requires specialized test equipment and software
to calibrate amplitude and frequency characteristics after repair.
There are NO supported field repairs to the SCM4000 Single
Carrier Modem.
Return the entire unit for factory repair.
If you attempt field repair, you risk damaging your
equipment. If your equipment is under warranty, you may also
affect your warranty coverage.
1.10 Tell Us What You Think!
We’d appreciate any comments or suggestions you have about
this manual. The more feedback we get, the better the manuals
get!
If you’re viewing this manual electronically, it’s easy - just click on
the following link to send us an E-mail.
Or, you can E-mail our Technical Support team at:
[e-mail].
Be sure to tell us what product you’re writing about, and which
manual - the Operator’s Guide, the Quick Reference Card, or the
Technical Reference Manual.
Feedback

Introduction 1-4SCM4000 Operator’s Guide
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2
Product Description 2-1SCM4000 Operator’s Guide/Tech Ref Manual
Product Description
2.1 Chapter Overview
This chapter provides an overall description of the SCM4000
Single Carrier Modem (SCM), its components, and its
capabilities.
Here are the topics covered:
Topic Page
System Description 2-1
Configuration Options 2-2
Configuration Descriptions 2-2
Power Options 2-5
Mounting and Deployment
Options
2-5
System Integration 2-5
SCM4000 Configurations 2-5
SCM4000 Modulator 2-6
SCM4000 Demodulator 2-6
SCM4000 Modulator/
Demodulator
2-7
SCM4000 Modulator/Encoder 2-7
SCM4000 Demodulator/Decoder 2-8
For More Information 2-8
2.2 System Description
The SCM4000 (Figure 2-1) is a highly reliable, flexible, and
compact microwave Single Carrier Modem ideal for fixed or
mobile installations.
Figure 2-1: SCM4000
The SCM4000 is used for transmitting and/or receiving digital
signals and compressed video signals through microwave radio
communications links and provides maximum flexibility to
support multiple configuration requirements with user-friendly
Preset selections.
The SCM4000 is ideal for microwave fixed links for Studio to
Transmitter Links (STL), Transmitter to Studio Links (TSL), Inter-
City Relay (ICR) service, Electronic News Gathering (ENG),
network distribution, satellite, and backhaul operations.
The SCM4000 is a versatile QAM modem designed to translate
between RS232/RS485, SMPTE310M, ASI, E3/DS3, T1/E1, and
10/100BaseT signals and 70 MHz IF.
The SCM4000 contains an RS232 interface to provide interface
connection for factory test purposes. A rear panel-mounted
connector is also provided to monitor summary alarms.

Product Description 2-2SCM4000 Operator’s Guide/Tech Ref Manual
Key features of the SCM4000 are as follows:
• The SCM4000 can be configured as a Modulator,
Demodulator, or both a Modulator and a Demodulator.
• Allows simplex or duplex operation depending upon the
SCM4000 configuration.
• Available with an optional MPEG Encoder or Decoder.
• Provides user control for functional parameters via front
panel controls and alphanumeric display.
• Modulation options include QPSK, 16 QAM, 32 QAM, and
64 QAM.
• Channel types accepted by the SCM4000 include DVB/
ASI, DS3/E3, T1/E1, RS232/RS485, 10/100 Ethernet,
and SMPTE310M.
2.2.1 Configuration Options
The SCM4000 is currently available in the following
configurations:
• SCM4000 Modulator
• SCM4000 Demodulator
• SCM4000 Modulator/Demodulator
• SCM4000 Modulator/Encoder
• SCM4000 Demodulator/Decoder
Consult your Sales Representative or contact the factory for the
latest information.
2.2.2 Configuration Descriptions
General The front panel of the SCM4000 (Figure 2-2 on page 2-
3) contains a POWER LED, an ALERT LED, an ALARM LED,
an alphanumeric display, and six function keys. The front panel
also contains an RS232 connector, located behind an access
cover, to provide interface connections to a Windows-based PC.
The rear panel of the SCM4000 contains the I/O connectors, the
input power connector, the power switch, and a fuse.
Controls, indicators, and connectors contained on all
configurations of the SCM4000 are identified and described in
the “Routine Operation” Chapter on page 3-1.
Modulator and Demodulator Configurations The base
Modulator and Demodulator configurations of the SCM4000
each contain one set of I/O connectors. See Figure 2-3 on
page 2-3 and Figure 2-4 on page 2-3.
Modulator/Demodulator Configuration The Modulator/
Demodulator configuration rear panel contains two sets of I/O
connectors. See Figure 2-5 on page 2-4.
Modulator/Encoder Configuration The Modulator/Encoder
configuration contains one set of I/O connectors, a VIDEO input
connector and two AUDIO connectors. See Figure 2-6 on
page 2-4.
Demodulator/Decoder Configuration The Demodulator/
Decoder configuration also contains one set of I/O connectors, a
VIDEO output connector and two AUDIO connectors. See
Figure 2-7 on page 2-4.

Product Description 2-3SCM4000 Operator’s Guide/Tech Ref Manual
Figure 2-2: SCM4000 Front Panel View
Figure 2-3: Modulator Rear Panel View
Figure 2-4: Demodulator Rear Panel Rear View
POWER IN
IF IN IF OUT T1/E1
10/100 1
ASI
2
ASI
3
ASI
DS3/E3 DS3/E3 SMPTE
RS232/485
SUM ALARM
1
2
POWER IN
FUSE
AC Power
Option
DC Power
Option
POWER IN
IF IN IF OUT T1/E1
10/100
DS3/E3 DS3/E3 SMPTE
1
ASI
2
ASI
3
ASI
RS232/485
SUM ALARM
1
2
POWER IN
FUSE
AC Power
Option
DC Power
Option

Product Description 2-4SCM4000 Operator’s Guide/Tech Ref Manual
Figure 2-5: Modulator/Demodulator Rear View
Figure 2-6: Modulator/Encoder Rear View
Figure 2-7: Demodulator/Decoder Rear View
POWER IN
IF IN IF OUT T1/E1
10/100 1
ASI
2
ASI
3
ASI
DS3/E3
DS3/E3 SMPTE
SUM ALARM
RS232/485
DS3/E3
DS3/E3 SMPTE
1
ASI
2
ASI
3
ASI
T1/E1
10/100 RS232/485
SUM ALARM
1
2
1
2
Modulator
Section
Demodulator
Section
POWER IN
FUSE
AC Power
Option DC Power
Option
AUDIO A AUDIO B
VIDEO
SUM ALARM
RS232/485
SMPTE
DS3/E3 DS3/E3
1
ASI
2
ASI
3
ASI
T1/E1
10/100
IF OUT
IF IN
POWER IN
1
2
Encoder
Section
Modulator
Section
POWER IN
FUSE
AC Power
Option DC Power
Option
AUDIO A AUDIO B
VIDEO
SUM ALARM
SMPTE
DS3/E3DS3/E3
1
ASI
2
ASI 3
ASI
T1/E1
10/100 RS232/485
IF IN IF OUT
POWER IN
1
2
Demodulator
Section
Decoder
Section
POWER IN
FUSE
AC Power
Option DC Power
Option

Product Description 2-5SCM4000 Operator’s Guide/Tech Ref Manual
2.2.3 Power Options
The flexible architecture of the SCM4000 allows a number of
options for the power source. The SCM4000 configurations can
be ordered to operate on the following optional AC and DC
power sources:
• 120/240 VAC, 50/60 Hz
• +24 to +48 VDC
• -24 to -48 VDC
Fuse ratings for the optional AC and DC power sources are
shown in Table 2-1.
Refer to the “Installation” Chapter on page 5-1 (part of the
SCM4000 Technical Reference Manual only) for additional
installation information.
2.2.4 Mounting and Deployment Options
The SCM4000 may be used in either fixed or mobile
applications. For fixed or mobile installation applications, the
SCM4000 is usually mounted in a standard 19-inch (48.3 cm)
rack.
Table 2-1: Fuse Ratings
Operating Voltage Fuse Rating
240 VAC, 50/60 Hz 1.0A, 250V AGC, Fast Blow
120 VAC, 50/60 Hz 2.0A, 250V AGC, Fast Blow
48 VDC 4.0A, 125V AGX, Fast Blow
24 VDC 7.5A, 32V AGC, Fast Blow
For more details on installation of the SCM4000 in various
applications, see the “Installation” Chapter on page 5-1 (part of
the SCM4000 Technical Reference Manual only).
2.2.5 System Integration
System Operation For the field operator, the SCM4000 has up
to nine Presets that can be selected from the front panel. Each
Preset controls key parameters such as modulation and audio
and video settings.
2.3 SCM4000 Configurations
Typical SCM4000 Configuration Block Diagrams are provided in
the following paragraphs.
For details on connections between the SCM4000 and
transmitter or receiver components, refer to the “Installation”
Chapter on page 5-1 (part of the SCM4000 Technical Reference
Manual only).

Product Description 2-6SCM4000 Operator’s Guide/Tech Ref Manual
2.3.1 SCM4000 Modulator
The SCM4000 Modulator block diagram is shown in Figure 2-8.
Figure 2-8: SCM4000 Modulator Block Diagram
POWER SUPPLY
AC/DC
POWER
DISTRIBUTION COMMAND AND
CONTROL AND FRONT PANEL
SCM
MODULATOR
STATUS
DISPLAY KEYPAD
CONTROL
(RS232)
E1/T1
10/100
E1/T1
10/100 RS232/
485
SUM
ALARM
ASI
DS3/E3
ASI
DS3/E3
ASI
SMPTE
MODULATOR
CORE BOARD
IF
OUT
POWER IMB
IF
OUT
123
INTERFACE BOARD
MICROPROCESSOR
2.3.2 SCM4000 Demodulator
The SCM4000 Demodulator block diagram is shown in Figure 2-
9.
Figure 2-9: SCM4000 Demodulator Block Diagram
POWER SUPPLY
AC/DC
POWER
DISTRIBUTION COMMAND AND
CONTROL AND FRONT PANEL
SCM
DEMODULATOR
STATUS
DISPLAY KEYPAD
CONTROL
(RS232)
E1/T1
10/100
E1/T1
10/100 RS232/
485
SUM
ALARM
ASI
DS3/E3
ASI
DS3/E3
ASI
SMPTE
DEMODULATOR
CORE BOARD IF IN
POWER IMB
IF IN
123
INTERFACE BOARD
MICROPROCESSOR