ComStream CM701 Operating instructions

6350 Sequence Drive
San Diego, California 92121-2724
619-458-1800 or 888-559-0831
01-0204-401 Rev. D 07/98
C
OM
S
TREAM
A Spar Company
®
CM701
PSK Digital Satellite Modem
Installation and Operation Guide

Notice
This publication and its contents are proprietary to ComStream Corporation (ComStream) and are
intended solely for the contractual use of its customers for no other purpose than to install and
operate the equipment described herein. This publication and its contents shall not be used or
distributed for any other purpose and/or otherwise communicated, disclosed, or reproduced in any
way whatsoever without the prior written consent of ComStream.
For the proper installation and operation of this equipment and/or all parts thereof, the instructions in
this guide must be strictly and explicitly followed by experienced personnel. All of the contents of
this guide must be fully read and understood prior to installing or operating any of the equipment or
parts thereof.
FAILURE TO COMPLETELY READ AND FULLY UNDERSTAND AND FOLLOW ALL
OF THE CONTENTS OF THIS GUIDE PRIOR TO INSTALLING AND/OR OPERATING
THIS EQUIPMENT, OR PARTS THEREOF, MAY RESULT IN DAMAGE TO THE
EQUIPMENT, OR PARTS THEREOF, AND TO ANY PERSONS INSTALLING AND/OR
OPERATING THE SAME.
ComStream does not assume any liability arising out of the application or use of any products,
component parts, circuits, software, or firmware described herein. ComStream further does not
convey any license under its patent, trademark, copyright, or common-law rights nor the similar
rights of others. ComStream further reserves the right to make any changes in any products, or parts
thereof, described herein without notice.
© 1991 -1998 ComStream Corporation. All rights reserved.
ComStream is a registered trademark of ComStream Corporation. Other brand and product names
mentioned herein may be trademarks or registered trademarks of their respective owners.
This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in a commercial environment. This
equipment generates, uses, and radiates radio frequency energy and, if not installed and used in
accordance with the instruction guide, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful interference, in which
case the user will be required to correct the interference at his or her own expense.
This symbol is intended to alert the user to the presence of important operating and maintenance
(servicing) instructions in the literature accompanying the appliance.
Warning! Shock Hazard!
Do Not Open The Equipment! Service Only By ComStream!
Gefährliche Spannung!
Öffnen des Gerätes und Service nur durch ComStream!
The CM701 contains no user-serviceable parts. Do not attempt to service this product yourself.
Any attempt to do so will negate any and all warranties.

EC Declaration of
Conformity We, ComStream Corporation, declare under sole responsibility that the CM701
PSK Digital Satellite Modem, manufactured at either or both of the following
locations:
ComStream Corporation
6350 Sequence Drive
San Diego, CA 92121-2724
GSS Array Technology
6835 Via Del Oro
San Jose, CA 95119-1315
to which this declaration relates, is in conformity with the requirements of the
following EC Directives:
Council Directive 73/23/EEC (and 93/68/EEC) on the harmonization of the
laws of the Member States relating to electrical equipment designed for use
within certain voltage limits is based on compliance with the following
harmonized standards:
EN60950:1992 + Amendments +1+2:1993 + Amendment 3:1995
Listed under TÜV Product Service Certification System, 13184
Council Directive 89/336/EEC (92/31/EEC and 93/68/EEC) on the
approximation of the laws of the Member States relating to electromagnetic
compatibility is based on compliance with the following harmonized
standards:
Electromagnetic Emissions – EN55022:1994
• Harmonic Current – EN61000-3-2:1995
• Voltage Fluctuations – EN61000-3-3:1995
Electromagnetic Immunity – EN50082-1:1992
• ESD – IEC801-2:1991
• Radiated Immunity – IEC801-3:1992
• EFT – IEC801-4:1984

C
OM
S
TREAM
A Spar Company
®

v
Contents
Preface Using This Guide ii
Warranty Statement ii
Return Procedure ii
Revision History ii
Customer Support ii
Safety Precautions ii
Chapter 1 Overview
Applications 1-2
Features 1-3
Modular Architecture 1-4
Option Cards 1-5
Framing Unit for IDR/IBS/SMS Operation 1-5
High Performance Reed-Solomon Coding 1-5
Satellite Control Channel 1-6
Doppler Buffer 1-6
Low-Speed Modem 1-6
Chapter 2 Theory of Operation
CM701 Architecture Overview 2-1
Chassis 2-1
Power Supply 2-2
Backplane 2-3
Standard Cards 2-4
Optional Cards 2-4
System Configuration, Monitor, and Control 2-5
BERT 2-5
Self-Diagnostics 2-5
CM701 Data Interface 2-5
Data Processing Path Examples 2-6
M&C Card 2-9
Modulator Operation 2-10
Transmit Process 2-10
Receive Process 2-11
Decoder ASICs 2-12
CM701 Solutions to Network Requirements 2-14

vi
Chapter 3 Common Configuration Issues
Overview 3-1
QPSK versus BPSK Modulation 3-1
BPSK Modulation 3-1
QPSK Modulation 3-1
BER Performance 3-2
BPSK and QPSK Comparison 3-2
Modem Acquisition Time Reduction 3-3
Acquisition Process 3-3
Reducing the Modem Acquisition Range (AR) 3-4
Reducing Time in a Bin 3-4
Fine-Tuning the Acquisition Starting Frequency (RS + AO and RO) 3-5
Fast Acquisition 3-5
Channel Spacing and Band Occupation 3-6
Basic Modem Performance 3-6
Modem Performance Degradation: QPSK Modulation 3-11
Modem Performance Degradation: BPSK Modulation 3-13
Doppler Shift 3-13
Effects of Doppler Shift on Data Transmission 3-13
Determining Doppler Buffer Size 3-14
System Clocking 3-14
Common System Clocking Schemes 3-14
Loop Timed Systems 3-15
Independently Timed Systems 3-16
Effects of High Data Rate or Long Cable Length on Internal Timing 3-17
Multiple Data Interface Application Support 3-18
Chapter 4 Installation
Overview 4-1
Installation Process Overview 4-1
Step 1: Prepare for CM701 Installation 4-2
Identify System Issues 4-2
Establish Operating Parameters 4-2
Step 2: Inspect the CM701 System 4-3
Examine the Shipping Carton 4-3
Open the Carton 4-4
Examine the Carton Contents 4-4
Step 3: Familiarize Yourself with the CM701 Chassis 4-4
Issuing Commands 4-4
Step 4: Perform a Bench-Top Test 4-5
Equipment Requirements 4-5
Test Procedure 4-5

vii
Step 5: Install and Connect the CM701 in a Permanent Location 4-7
Step 6: Configure the CM701 4-10
Acquire the Carrier 4-11
Acquisition Commands 4-12
Step 7: Validate the System 4-13
Step 8: Optional Front Panel Lockout 4-13
Chapter 5 Remote Operation
Remote Communications Overview 5-1
ASCII and ComStream Packet Protocol 5-1
Configuration 5-1
Issuing Remote Commands 5-2
Command Syntax 5-2
Command Entry 5-2
Command Summary 5-3
Security Commands 5-9
Error Codes 5-9
Chapter 6 Front Panel Operation
CM701 Front Panel Components 6-1
LCD Display 6-2
LEDs 6-3
Buttons 6-4
CM701 Command Tree 6-5
Navigating Through the Command Tree 6-7
Tree Level Navigation 6-7
Command List Navigation 6-7
Navigating Between Command Lists 6-7
Command Display 6-8
Entering Commands with the Terminal Emulator 6-9
Terminal Emulator Command Syntax 6-9
Command Entry 6-9
Front Panel Command 6-10
Entry 6-10
Summary 6-11
Chapter 7 Internal BERT
Functional Description 7-1
Transmit Side Pattern Generator 7-2
Receive Side Error Analyzer 7-2
Issuing BERT Commands 7-2
Remote Terminal 7-2
Front Panel 7-3

viii
Using the BERT 7-4
Enable the BERT 7-4
Check Pattern Types 7-4
View Measurement and Error Detection Results 7-4
BERT Commands 7-5
Modem Verification Using the BERT 7-6
Performing a BERT IF Loopback Test 7-6
Advanced BERT Verification and Error Analysis 7-9
Troubleshooting Random Errors 7-9
Troubleshooting External DCE Equipment 7-9
Chapter 8 Command Descriptions
Issuing Remote Commands 8-1
Issuing Front Panel Commands 8-1
Issuing Commands Using the Terminal Emulator 8-2
Command Types 8-2
Alphabetical Command Listing 8-3
Chapter 9 Configuration Examples
Overview 9-1
ComStream Closed-Network-Compatible Operation 9-2
INTELSAT Business Services (IBS)-Compatible Operation 9-6
Intermediate Data Rate (IDR)-Compatible Operation 9-8
Satellite Multiservice System (SMS)-Compatible Operation 9-10
Chapter 10 Advanced Usage
Data Paths 10-1
Standard Data Path Configuration 10-2
Data Path Commands 10-3
Autoconfiguration of Data Paths 10-3
Issuing Data Path Commands 10-4
Rules for Issuing Data Path Commands 10-4
General Data Path Parameter Rules 10-5
Additional Transmit Data Paths Limits 10-5
Additional Receive Data Paths Limits 10-6
Using the I/O Connector on the Modem Card 10-6
Returned Error and Warning Messages 10-7
Data Path Command Relationships 10-7
Data Rate Macro Command Relationships 10-7
TIO and RIO Command Relationships to Data Path Commands 10-9

ix
Working with Data Paths 10-9
Show Path Command 10-9
Clear Path Command 10-9
Current Active Status and Current Active Path Commands 10-10
Using CAP with Verbose Mode 10-12
Autoconfiguration Feature 10-13
Autoconfiguration Path Command 10-13
Configuration Path Control Command 10-13
Autoconfiguration Process 10-13
Precedence Set by Autoconfiguration 10-14
I/O Card Connections 10-14
Configurations Supported by Autoconfiguration 10-15
Advanced Configuration Command Summary 10-16
Chapter 11 External Connections
Basic CM701 Configuration 11-1
External Connections for Basic CM701 Configuration 11-2
AC Power Supply Card External Connections 11-2
AC Power Cord Connector 11-2
RS-449 Data Interface Card External Connections 11-3
Tx/Rx Data Connector 11-3
EIA RS-449 Electrical Specifications 11-3
RS-449 Signal Descriptions 11-4
Clock/Data Relationships for the RS-449 Card 11-5
RS-449 Data Control Signals 11-6
Monitor & Control Card External Connections 11-7
Remote Control Connector 11-8
Status Relay Connector 11-10
Form-C Current Fault Status Relay Usage 11-11
Status Relay Fault Conditions 11-11
Commands Used with the Status Relay 11-12
Specifying Status Relay Fault Conditions 11-12
Relay Sense Pins Usage 11-13
Commands Used with Relay Sense Pins 11-14
Specifying a Relay Sense Pin Fault Condition 11-14
Demodulator Card External Connections 11-15
RxIF Connector (BNC) 11-15
Rx Loopback Connector (BNC) 11-15
AGC Monitor Connector (BNC) 11-16
Modulator Card External Connections 11-16
TxIF Connector (BNC) 11-16
Tx Loopback Connector (BNC) 11-16

x
Chapter 12 Fault Handling, Troubleshooting, and Maintenance
Fault Handling 12-1
Fault Reporting 12-2
Specifying Faults to be Monitored and Reported 12-2
Conditions for Remote Fault Messages 12-2
Conditions for Front Panel Fault LEDs 12-3
Fault Logging 12-3
Fault Queries 12-3
Standard CM701 Faults 12-4
Interpreting Fault Logs 12-8
Fault Overlay Masks 12-9
Troubleshooting Tips 12-10
CM701 Specification Testing 12-12
Hardware Self-Test 12-12
Modulator Output Signal Test 12-12
Modem Performance Test 12-12
Other Specification Tests 12-13
System Validation and Fault Isolation Tests 12-13
Near Data Loopback 12-14
IF Loopback 12-15
Satellite Loopback 12-16
Far Data Loopback 12-17
Long-Term Bit Error Rate (BER) Measurement 12-18
Board-Level Hardware Testing 12-18
Group Board-Level Hardware Test 12-18
Individual Board-Level Hardware Test 12-19
Data Interface Card Activation 12-19
Software Upgrade Instructions 12-20
Option Cards 12-21
Card Installation Procedure 12-23
Card Removal Procedure 12-23
General Maintenance 12-24
Appendix A Technical Specifications
Electrical and Performance A-1
System A-1
Modulator A-2
Demodulator A-3
BERT A-3
Mechanical and Environmental A-4
Regulatory Compliance A-4

xi
Appendix B Operating Parameters for CX801/101 Protection Switches
Redundant Configuration B-1
Setting Operational Parameters B-1
Firmware Revision Levels B-1
CM701 Parameters B-2
CX101 Front Panel Limitations B-3
CX101 Front Panel Limitations B-3
Bypassing CX101 Front Panel Limitations B-3
Switchover Time Specifications B-4
Additional Information B-4
Appendix C ComStream Packet Protocol
Packet Protocol Interface C-1
Packet Protocol Messaging C-1
Acknowledgment Packets C-1
Packet Protocol Communication Modes C-2
Packet Format and Content C-2
Address Selection C-3
Extended Addressing C-4
Packet Protocol Command Syntax C-4
Packet Protocol Command Execution C-4
Controller Packet Command Example C-5
ComStream-Specific Packet Control Commands C-5
External Connections C-10
Glossary
Index

xii
Figures
Figure 1-1 CM701 PSK Digital Satellite Modem 1-1
Figure 1-2 SCPC Application Using CM701 Modems 1-2
Figure 2-1 CM701 Front Panel 2-1
Figure 2-2 CM701 Rear Panel 2-2
Figure 2-3 CM701 Mechanical Block Diagram 2-3
Figure 2-4 Data Interface Card Block Diagram 2-6
Figure 2-5 Standard CM701 2-7
Figure 2-6 Standard CM701 with Receive Doppler Buffer 2-7
Figure 2-7 Open Network with a Framing Unit 2-8
Figure 2-8 Open Network with a Framing Unit & Intelsat Reed-Solomon Card 2-8
Figure 2-9 Standard CM701 with Multiple Data Interface Cards 2-8
Figure 2-10 Monitor & Control Card 2-9
Figure 2-11 CM701 Transmit Process 2-10
Figure 2-12 CM701 Receive Process 2-11
Figure 3-1 Performance QPSK Uncoded 3-7
Figure 3-2 Performance QPSK Sequential Rate 1/2 3-8
Figure 3-3 Performance QPSK Sequential Rate 3/4 3-9
Figure 3-4 Performance QPSK Viterbi 3-10
Figure 3-5 QPSK Performance Degradation versus Carrier Spacing Using
ComStream Spectral Mask and Eb/N02.0 dB 3-11
Figure 3-6 QPSK Performance Degradation versus Carrier Spacing Using
ComStream Spectral Mask and Eb/N04.0 db 3-12
Figure 3-7 QPSK Performance Degradation versus Carrier Spacing Using IBS/IDR
Spectral Mask and Eb/N02.0 db 3-12
Figure 3-8 QPSK Performance Degradation versus Carrier Spacing Using IBS/IDR
Spectral Mask and Eb/N04.0 db 3-13
Figure 3-9 Loop Timed Systems 3-15
Figure 3-10 Independently Timed Systems 3-16
Figure 4-1 CM701 Standard Rear Panel 4-8
Figure 6-1 CM701 Front Panel 6-1
Figure 6-2 CM701 Front Panel Command Tree 6-5
Figure 7-1 CM701 BERT Block Diagram 7-1
Figure 7-2 Accessing BERT Commands 7-3
Figure 7-3 BERT/IF Loopback Test 7-6
Figure 10-1 Backplane Connections for Standard CM701 10-2
Figure 10-2 Open Network with Framing Unit and Intelsat Reed-Solomon 10-2
Figure 10-3 Configuration Data Paths in which Modem I/O Connector is Used 10-6

xiii
Figure 11-1 Example of Standard CM701 Rear Panel 11-1
Figure 11-2 RS-449 Timing Diagram 11-5
Figure 11-3 Relay Sense Pins 11-13
Figure 12-1 Near Data Loopback 12-14
Figure 12-2 IF Loopback 12-15
Figure 12-3 Satellite Loopback 12-16
Figure 12-4 Far Data Loopback 12-17
Figure 12-5 Standard CM701 Rear Chassis Configuration Example 12-21
Figure 12-6 Examples of Horizontal and Vertical Option Cards 12-22
Figure C-1 Packet Format C-2

xiv
Tables
Table 2-1 CM701 Solutions 2-14
Table 4-1 Straight-Through Cable 4-5
Table 4-2 Power-up Sequence (Bench-top Test) 4-6
Table 4-3 Front Panel Button Operation Verification 4-6
Table 4-4 Power-Up Sequence (Permanent Location) 4-9
Table 4-5 Commonly Used Configuration Commands 4-10
Table 4-6 Commonly Used Acquisition Commands 4-12
Table 4-7 CM701 System Tests 4-13
Table 5-1 Configuration Command Memory Types 5-3
Table 5-2 Command Function Types 5-3
Table 5-3 Remote Command Summary 5-4
Table 5-4 Remote Control Error Codes 5-10
Table 6-1 LCD Display Information 6-2
Table 6-2 Command Functional Types 6-2
Table 6-3 CM701 LEDs 6-3
Table 6-4 CM701 Front Panel Buttons 6-4
Table 6-5 CM701 Front Panel Command Tree Levels 6-6
Table 6-6 Front Panel Command Summary 6-11
Table 7-1 BERT Commands 7-5
Table 7-2 BERT BMonitor Command Status Data 7-7
Table 7-3 BER Test Troubleshooting 7-8
Table 8-1 Command Memory Types 8-2
Table 8-2 Command Function Types 8-2
Table 8-3 CFG Card Types and Codes 8-18
Table 8-4 Common Fault Conditions (Fault History Query) 8-28
Table 8-5 Common Fault Conditions (Current Fault Query) 8-58
Table 10-1 Standard Configuration Data Rate Macro Commands 10-8
Table 10-2 Multiple Data Path Data Rate Macro Commands 10-8
Table 10-3 Configurations Supported by Autoconfiguration 10-15
Table 10-4 Advanced Configuration Command Summary 10-16
Table 11-1 Electrical Specifications for Differential and Single-Ended Drivers
and Receivers 11-3
Table 11-2 RS-449 Data Interface Connector Pinout 11-4
Table 11-3 Transmit Path Signals 11-5
Table 11-4 Receive Path Signals 11-5
Table 11-5 Data Control Signals 11-6
Table 11-6 M&C Card Connectors 11-7
Table 11-7 RS-485 J1: Remote Control Connector Pinout 11-8
Table 11-8 RS-232 Remote Control 9-Pin Connector Pinout 11-9

xv
Table 11-9 RS-232 Remote Control 9-to-25-Pin Adapter Cable 11-9
Table 11-10 Customer Cable Replacement for RS-232 Remote Control
9-to-25-Pin Adapter Cable 11-10
Table 11-11 Status Relay 9-Pin Connector Pinout 11-10
Table 11-12 User-Specified Fault Conditions 11-11
Table 11-13 Bit Conditions 11-11
Table 11-14 Commands Used with the Status Relay 11-12
Table 11-15 Commands Used with Relay Sense Pins 11-14
Table 11-16 Demodulator Card BNC Connectors 11-15
Table 12-1 CM701 Fault Summary 12-5
Table 12-2 Fault Overlay Masks Example Data 12-9
Table 12-3 CM701 Troubleshooting Common Problems 12-10
Table B-1 Minimum Firmware Revision Levels B-1
Table B-2 CM701 Parameters B-2
Table C-1 ComStream Packet Protocol Byte Descriptions C-3
Table C-2 Packet Protocol EM Query Command Example C-5
Table C-3 Binary Dump Commands C-5
Table C-4 BD Byte Sequence C-6
Table C-5 BD 1 Byte Sequence C-9
Table C-6 RS-485 Device Pinout Specifications C-10

xvi
C
OM
S
TREAM
A Spar Company
®

xvii
Preface
Using This Guide Welcome to the ComStream world of satellite-based communications products
and systems. This guide is your sourcebook for using the ComStream CM701
PSK Digital Satellite Modem. It describes the installation, operation, and
performance specifications of this product.
The chapters in this guide provide step-by-step instructions for a variety of tasks
and activities, including unpacking, setting up, mounting, and operating the
CM701. The chapters also provide an overview of system operations as well as
technical specifications and troubleshooting procedures.
This guide is designed to help you find information quickly and easily. To take full
advantage of this design, please take a moment to review the specific formats.
Locating Information
To help you quickly locate information, this guide includes:
Table of contents
Glossary
Index
Quick reference cards
Important Information
Throughout this guide you will find the following icons designed to help you
identify important information:
The note icon identifies information for the proper operation of your equipment,
including helpful hints, shortcuts, or important reminders.
The caution icon identifies information that requires careful attention in order to
prevent equipment damage and/or injury to the operator.
The troubleshooting icon identifies information that will assist you in solving
malfunctions in your equipment.
Illustrations
Some illustrations contained in this guide may differ slightly from those shown on
your front panel display or computer console due to variations in your system
setup, configuration, or customization.

xviii
Figures depicting equipment may differ from those at your site; therefore, refer to
the labeling on your ComStream equipment to identify the components. An effort
has been made to use illustrations that reflect basic equipment and configurations
of the majority of customers.
Keyboard Entries
Each activity or task is presented in a series of numbered, step-by-step
instructions. Commands or information that you type into the system appear in a
different, bold type:
Type ST ?.
If the command contains variable information that is to be typed into the system,
the variable information is in different type but not bold:
CPA <packet address>
In this example, you would type CPA then the correct value for <packet
address>.
Keys that are pressed in combination appear with a plus sign (+). For example:
CTRL+SHIFT+3
You hold down the Control and Shift keys and press the number 3.
Key names appear in a different type. For example:
PAGE DOWN
Navigation
This guide uses right angle brackets (>) to indicate a sequence of menus,
submenus, and menu items. For example, “Select Text>Print” means the same as
“From the Text menu, select Print.”
DOS Displays
The system may return values and messages on a front panel LCD, remote
terminal, or both. In this guide, these values and messages appear in a different
type:
PTP 27 PRP 62
STP 0 SRP 0
TTP 0 TRP 0

xix
Warranty Statement ComStream warrants that its products are free from defects in material and
workmanship at the time of shipment and that they conform to applicable
specifications. In no event will ComStream be liable for consequential misuse or
damages.
The ComStream CM701 is warranted against any above-mentioned defects that
may occur within one year of the shipping date.
Should it be necessary to make a claim against this warranty, the buyer shall first
notify ComStream Customer Service to define the nature of the problem. When
returning products, please be aware of the following:
1. Products returned to ComStream, whether for upgrade, warranted or out-of-
warranty repair work, or maintenance, must comply with the ComStream
Return Procedure.
2. Products shall be forwarded to ComStream, transportation prepaid.
3. Products returned to ComStream freight collect or without a return material
authorization number will not be accepted.
4. ComStream shall not accept any responsibility for returned products that are
improperly packaged and/or damaged in shipment. If possible, please use
original shipping and packaging materials.
5. Original product identification markings and labels must not have been
removed, defaced, or altered. Further, to preserve the warranty the product
should not be subjected to abuse, improper installation or application,
alteration, accident, or negligence in use, storage, transportation, or handling.
6. Any returned product shall be completely evaluated in an attempt to duplicate
the problem so that appropriate corrective action and repair may be
completed. Following repair, the product shall be thoroughly tested for
compliance with appropriate specifications. This process will be handled
promptly but may be subject to available labor and material resources.
The ComStream warranty, as stated herein, is in lieu of all other warranties,
expressed, implied, or statutory.
For further information, please contact ComStream Customer Service at
619-657-5454 or toll free at 888-559-0831.

xx
Return Procedure If it is necessary to return a product for out-of-warranty repair, upgrade, or any
modification, the following procedures must be followed:
1. Contact ComStream Customer Service, located in the United States, by phone
or fax, at:
Phone 619-657-5454, or toll free at 888-559-0831
Fax 619-657-5455
2. Speak to a ComStream Customer Service representative about any questions,
issues, or problems. Quite often equipment problems can be corrected over
the phone, which keeps your equipment inservice and avoids unnecessary and
costly downtime.
3. Should it be necessary to return a product to ComStream for any reason, the
ComStream Customer Service representative will issue you a return material
authorization (RMA) number. To issue an RMA number, the ComStream
representative will need the product serial number and model number.
4. You may be returning a product for either repair, upgrade, or modification. If
you are returning the product for:
Repair – Include a complete description of the problem, the operating
conditions that caused the problem, and any circumstances that may have
led to the problem. This information is essential for ComStream repair
technicians to reproduce, diagnose, and correct the problem.
Upgrade or modification – Include a complete description of the current
configuration and the desired change(s). This information will allow a
ComStream Customer Service representative to provide a formal quote
for the upgrade.
5. Include a purchase order (PO) for any upgrade or out-of-warranty repair work
being performed. ComStream will begin repair work after a PO is received.
6. Reference the RMA number on all paperwork that accompanies the
equipment, and write the RMA number clearly on the outside of the shipping
container.
7. Ship your module in the original shipping carton and packaging (or its
equivalent), prepaid, to:
ComStream
6350 Sequence Drive
San Diego, CA 92121-2724 USA
RMA Number
Do not include product accessories such as manuals, other printed material, or
rack-mount brackets.
When handling or shipping static-sensitive equipment, observe antistatic
procedures, and always use antistatic bags for shipment.
All equipment upgrade and repair requests will be completely evaluated and the
required work performed promptly. The equipment will then be thoroughly tested
for compliance with appropriate specifications.
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