ComStream CM601 Operating instructions

6350 Sequence Drive
San Diego, California 92121-2724
619-458-1800
888-559-0831
01-0779-401 Rev. A 08/98
C OM S TREAM
A Spar Company
®
CM601
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.
© 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.
Dieses Symbol weist den Benützer darauf hin, daß wichtige Bedienungs- und Wartungsanleitungen
(Service), die dem Gerät beiliegen, zu beachten sind.
Bitte beziehen Sie sich auf den Anhang über Sicherheit, für die Deutsche Uebersetzung wichtiger
Sicherheitsinformationen.
Warning! Shock Hazard!
Do Not Open The Equipment! Service Only By ComStream!
Gefährliche Spannung!
Öffnen des Gerätes und Service nur durch ComStream!
The CM601 contains no user-serviceable parts. Do not attempt to service this product yourself.
Any attempt to do so will negate any and all warranties.

Notice iii
EC Declaration of
Conformity We, ComStream Corporation, declare under sole responsibility that the CM601
PSK Digital Satellite Modem, manufactured at:
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 2nd Edition + Amendments +1+2:1993 +
Amendment 3:1995 + Amendment 4+11:1997

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 – EN55022:1995

Electromagnetic Immunity – EN50082-1:1997
• ESD – EN61000-4-2:1995
• Radiated Immunity – EN61000-4-3:1996
• EFT – EN61000-4-4:1996
• Surge – EN61000-4-5:1995
• Conducted Immunity – EN61000-4-6:1996
• Magnetic Field – EN61000-4-8:1994
• Voltage Variation – EN61000-4-11:1994
• Keyed Carrier – ENV50204:1995
ComStream Corporation, A Spar Company or
6350 Sequence Drive
San Diego, CA 92121
GSS Array Technology
6835 Via Del Oro
San Jose, CA 95119-1315

iv Notice
C OM S TREAM
A Spar Company
®

Contents v
Contents
Preface Using This Guide xiii
Warranty Statement xv
Return Procedure xvi
Revision History xvii
Customer Support xvii
Safety Precautions xviii
Chapter 1 Overview
Applications 1-2
Features 1-3
Modular Architecture 1-4
Chapter 2 Theory of Operation
CM601 Architecture Overview 2-1
Chassis 2-1
Power Supply 2-3
Backplane 2-3
Standard Cards 2-3
Option Cards 2-4
System Monitor and Control 2-4
Modem Card 2-5
Modulator 2-5
Demodulator 2-6
Data I/O Interface 2-7
Doppler Buffer 2-7
M&C Card 2-7
BERT 2-8
Chapter 3 External Connections
Low-Speed Modem Card Connectors 3-1
Tx/Rx Connector 3-1
Tx IF Connector 3-7
Rx IF Connector 3-7
M&C Card 3-8
Remote Control Connector 3-8
Status Relay Connector 3-10

vi Contents
Chapter 4 Installation
Installation Process 4-1
Step 1: Prepare for CM601 Installation 4-2
Identify System Issues 4-2
Site and Equipment Information 4-2
Installation Data Sheet 4-3
Establish Configuration Parameters 4-4
Step 2: Inspect the CM601 System 4-4
Examine the Shipping Cartons 4-4
Examine the Carton Contents 4-5
Step 3: Familiarize Yourself with the CM601 Chassis 4-6
Issuing Commands 4-6
Step 4: Perform a Bench-Top Test 4-7
Equipment Requirements 4-7
Test Procedure 4-7
Additional Testing 4-9
Completion of the Bench-Top Test 4-9
Step 5: Install and Connect the CM601 in a Permanent Location 4-10
Step 6: Configure the CM601 4-11
Acquire the Carrier 4-12
Acquisition Commands 4-12
Step 7: Validate the System 4-13
Step 8: Optional Front Panel Lockout 4-14
Chapter 5 Remote Commands and Error Codes
Remote Communications Overview 5-1
ASCII and ComStream Packet Protocol 5-1
Configuration 5-1
Issuing Commands 5-2
Command Summary 5-2
Security Commands 5-13
Error Codes 5-14
Chapter 6 Front Panel Operation
CM601 Front Panel Components 6-1
LCD Display 6-2
LEDs 6-3
Buttons 6-4
CM601 Command Tree 6-5

Contents vii
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
Issuing Commands Through the Command Tree 6-9
Issuing Commands with the Terminal Emulator 6-9
Command Summary 6-10
Chapter 7 Configuration Examples
Overview 7-1
ComStream Closed-Network-Compatible Operation 7-2
CM601 Configuration with Standard Cards 7-2
CM601 Configuration with Two Data Interfaces 7-4
INTELSAT Business Services (IBS) Compatible Operation 7-6
Perform an IF Loopback 7-7
Intermediate Data Rate (IDR)-Compatible Operation 7-8
Perform an IF Loopback 7-9
Chapter 8 Fault Handling, Troubleshooting, and Maintenance
Fault Handling 8-1
Fault Reporting 8-2
Specifying Faults to be Monitored and Reported 8-2
Conditions for Remote Fault Messages 8-2
Front Panel Fault LEDs 8-3
Fault Logging 8-3
Fault Queries 8-3
Standard CM601 Faults 8-4
Interpreting Fault Logs 8-8
Fault Overlay Masks 8-8
Procedure to Specify Status Relay Overlay Mask Bits 8-9
Procedure to Specify the Polarity of a Relay Sense Pin 8-9
Troubleshooting Tips 8-10
CM601 Specification Testing 8-12
Hardware Self-Test 8-12
Modulator Output Signal Test 8-12
Modem Performance Test 8-12
Other Specification Tests 8-13

viii Contents
System Validation and Fault Isolation Tests 8-13
Near Data Loopback Test 8-13
IF Loopback Test 8-14
Satellite Loopback Test 8-15
Far Data Loopback Test 8-16
Long-Term BER Measurement Test 8-16
Board-Level Hardware Testing 8-17
Group Board-Level Hardware Test 8-17
Individual Board-Level Hardware Test 8-17
Data Interface Card Activation 8-17
Software Upgrade Instructions 8-18
CM601 Option Cards 8-19
Card Installation Procedure 8-20
Card Removal Procedure 8-20
Maintenance 8-21
Appendix A Technical Specifications
System A-1
Low Speed Modem A-3
BERT (Optional) A-4
Regulatory Compliance A-5
Available Option Cards A-5
Appendix B Internal BERT
Functional Description B-1
Transmit Side Pattern Generator B-2
Receive Side Error Analyzer B-2
Issuing BERT Commands B-2
Issuing Commands From a Remote Terminal B-2
Issuing Commands From the Front Panel B-2
Enabling the BERT B-4
Disabling the BERT B-4
BERT Command Summary B-4
BERT Usage B-5
Check Pattern Types B-5
View Measurement and Error Detection Results B-6
Modem Verification Using the BERT B-6
Performing a BERT BER Test B-6

Contents ix
Advanced BERT Verification and Error Analysis B-8
Troubleshooting Random Errors B-8
Troubleshooting External DCE Equipment B-8
Time-Based Error Analysis Measurements B-8
Pattern Slip Analysis B-8
Appendix C Sicherheitsvorschriften
Identifizierung wichtiger Informationen C-1
Sicherheitsmaßnahmen C-2
Befolgen Sie den Einschaltablauf C-2
Sicheren Stellplatz einräumen C-2
Näße und Feuchtigkeit vermeiden C-2
Hitze, Feuchtigkeit und Staub ist zu vermeiden C-2
Für ausreichende Ventilation sorgen C-2
Richtiger Netzanschluß C-3
Stromzufuhrkabel sicher verlegen C-4
Schutz gegen Blitzschlag und Netzschwankungen C-5
Beim auswechseln einer Leiterplatte den CM601 abschalten C-5
Anti-Statik-Schutz C-5
Gegenstände fernhalten C-5
Nur genehmigte Zusatzgeräte benützen C-5
Reinigen des CM601 C-6
Service am CM601 C-6
Sicherheitsüberprüfung der Leistung C-6
Glossary
Index

x Contents
Figures
Figure 1-1 CM601 PSK Digital Satellite Modem 1-1
Figure 1-2 SCPC Application Using the CM601 1-2
Figure 2-1 CM601 Front Panel 2-1
Figure 2-2 CM601 Rear Panel 2-2
Figure 2-3 CM601 Mechanical Block Diagram 2-3
Figure 2-4 CM601 Transmit Process 2-5
Figure 2-5 L-Band Demodulator Block Diagram 2-6
Figure 2-6 M&C Card 2-7
Figure 3-1 Clock and Data Signal Timing Diagram 3-5
Figure 3-2 Relay Sense Pins 3-11
Figure 4-1 CM601 Rear Panel 4-6
Figure 6-1 CM601 Front Panel 6-1
Figure 6-2 CM601 Front Panel Command Tree 6-5
Figure 8-1 Near Data Loopback 8-13
Figure 8-2 IF Loopback 8-14
Figure 8-3 Satellite Loopback 8-15
Figure 8-4 Far Data Loopback 8-16
Figure 8-5 CM601 Rear Chassis Configuration 8-19
Figure 8-6 Option Card 8-19
Figure B-1 BERT Block Diagram B-1
Figure B-2 BERT Front Panel Command Tree B-3

Contents xi
Tables
Table 3-1 Modem Card Connectors 3-1
Table 3-2 Electrical Specifications for Differential (RS-442) and Single-
Ended (RS-423) Drivers and Receivers 3-2
Table 3-3 RS-449 Data Interface 37-Pin Connector Pinout 3-3
Table 3-4 V.35 Interface Connector Pinout 3-4
Table 3-5 Transmit Path Signals 3-5
Table 3-6 Receive Path Signals 3-5
Table 3-7 Data Control Signals 3-7
Table 3-8 M&C Card Connectors 3-8
Table 3-9 RS-232 Remote 9-Pin Connector Pinout for DCE 3-9
Table 3-10 RS-232 Remote 9-to-25-Pin Adapter Cable for DCE 3-9
Table 3-11 RS-485 Remote Connector Pinout for DCE 3-10
Table 3-12 Status Relay 9-Pin Connector Pinout 3-10
Table 3-13 Fault Status Bits for Relay Sense Pins 3-12
Table 4-1 Straight-Through Cable Pinout Specifications 4-7
Table 4-2 Power-Up Sequence 4-8
Table 4-3 Front Panel Button Operation Verification 4-9
Table 4-4 Commonly Used Acquisition Commands 4-12
Table 4-5 CM601 System Tests 4-13
Table 5-1 Configuration Command Memory Types 5-2
Table 5-2 Command Function Types 5-3
Table 5-3 Command Summary 5-4
Table 5-4 Error Codes 5-14
Table 6-1 LCD Display Information 6-2
Table 6-2 Command Functional Types 6-2
Table 6-3 CM601 LEDs 6-3
Table 6-4 CM601 Front Panel Buttons 6-4
Table 6-5 CM601 Front Panel Command Tree Levels 6-6
Table 6-6 Front Panel Command Summary 6-11
Table 8-1 CM601 Faults 8-5
Table 8-2 Fault Overlay Masks Example Data 8-8
Table 8-3 Troubleshooting Common CM601 Problems 8-10
Table B-1 BERT Commands B-5
Table B-2 BERT Monitor Command Status Data B-6
Table B-3 BER Test Troubleshooting B-7

xii Contents
C OM S TREAM
A Spar Company
®

Preface xiii
Preface
Using This Guide Welcome to the ComStream world of satellite-based communications products
and systems. Documentation for the CM601 consists of the following two guides:
 CM601 PSK Digital Satellite Modem Installation and Operation Guide
(CM601 I&O Guide)
 CM601 PSK Digital Satellite Modem Reference Guide (CM601 Reference
Guide)
This guide, the CM601 I&O guide, 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 setting up,
mounting, and operating the CM601. The chapters also provide an overview of
system operations as well as technical specifications and troubleshooting
procedures.
The CM601 Reference guide is an optional guide which covers the following
content area:

System configuration issues – to help you better plan your system design,
installation, and operation in order to avoid potential system issues

CM601 commands – consisting of an alphabetical listing and detailed
description of all standard and advanced CM601 commands

ComStream packet protocol – explains packet protocol, the interface,
messaging, packet format and content, addressing, and specific packet control
commands

Advanced usage – for those applications requiring the installation of an
additional I/O card or other option card
For more information on these guides, or to order the optional CM601 Reference
Guide, call ComStream Customer Service.
ComStream guides are 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

xiv Preface
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.
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 is in different type but not bold: VST <mode>.In this example, you
would type VST then the correct value for <mode>.
Key names appear in a different type; for example SPACE BAR.
Displays
The system may return values and messages that display on the front panel LCD
or a remote terminal. In this guide, these values and messages appear in the
following type: Tx Power Fault.

Preface xv
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 CM601 is warranted against any above-mentioned defects that
may occur within two years 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.

xvi Preface
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 [phone], or toll free at 888-559-0831

Fax [phone]
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 in service 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.

Preface xvii
Revision History This guide is periodically updated and revised. For documentation updates, call
ComStream Customer Service, located in the United States, at 619-657-5454, toll
free at 888-559-0831, or fax your request to 619-657-5455.
Customer Support We hope this guide provides all the information and instructions you need to
operate the CM601.
However, in the event that you need further assistance, or if problems are
encountered, ComStream has set up a Customer Support Line for your use. Please
feel free to contact ComStream Customer Support, located in theUnited States, by
phone or fax at:

Phone [phone], toll free at 888-559-0831
Monday through Friday, 8:00 a.m. to 5:00 p.m. Pacific time

Fax [phone]
Revision
1
Date Type of Revision
A 06/98 Initial release
1Revision A is always the first official release to ComStream customers.

xviii Preface
Safety Precautions Carefully read and follow all safety, use, and operating instructions before
operating the CM601. Heed all warnings and cautions contained in this guide.
Retain these instructions for future reference.
Follow the Startup Procedure
Do not plug in the CM601 until you have connected the system and read the chapter on
external connections and installation.
Provide a Safe Location
Place the CM601 in a rack or on a stable surface of sufficient size and strength, where it
will not be jarred, hit, or pushed off its surface. Ensure that all cables and cords are out of
the way and will not be tripped over, as this could cause personal injury or serious damage
to the CM601.
Avoid Water and Moisture
Do not expose the CM601 to any liquids, which are often found in flower vases, coffee
cups, rain from open windows, and so on. If the CM601 is exposed to any liquid, contact
ComStream, as serious damage could occur to the CM601 or its components.
Avoid Heat, Humidity, and Dust
To avoid internal damage, the CM601 should be placed away from all heat sources,
including radiators, heater ducts, and so on, out of direct sunlight and away from high
humidity, excessive dust, or mechanical vibrations that can cause damage to internal parts.
Provide Adequate Ventilation
Slots and openings on the CM601 are provided for ventilation that is needed to ensure
reliable operation. To avoid overheating and ensure that the ventilation slots are not
blocked, place the CM601 on a smooth, hard surface that has at least two inches of
clearance around the unit and adequate air circulation. If the CM601 is placed in a closed
area, such as a bookcase or rack, ensure that proper ventilation is provided and that the
internal rack operating temperature does not exceed the maximum rated temperature at the
position of the CM601.
Never place the CM601 on a soft surface that would obstruct the required airflow into the
CM601 ventilation slots.
Use the Correct Power Source
For CM601 units equipped with a North American power cord, the cord has an IEC 320
female plug on one end, and an NEMA 5-15P male plug on the other end. This cord is UL
and CSA approved up to 125 VAC at 10 A and is ready to use with no user wiring
required.
For CM601 units equipped with an International power cord, the cord has an IEC 320
female plug on one end, and three stripped and tinned bare wires on the other end. This
cord is HAR approved up to 250 VAC at 6 A and complies with the international color
codes of green/yellow (ground), blue (neutral), and brown (line).
If these color codes do not correspond to the colored markings on the terminals in the
plug, use the following standards:

The green/yellow wire must be connected to the plug terminal marked by the letter E
or by the earth symbol ( ) or color-coded green and yellow.

The blue wire must be connected to the plug terminal marked with the letter N or
color-coded black.

The brown wire must be connected to the plug terminal marked with the letter L or
color-coded red.

Preface xix
An AC plug must be attached to the International power cord in accordance with
government standards and codes in effect at the CM601 installation site. If an
unterminated power cord is supplied with the unit, the appropriate certified termination
plug must be installed. The following is a list of the required certifying agencies for
various countries:
Route Power Cords Safely
Route power cords so that they are not walked on or pinched. Pay particular attention to
cords and connections at the plugs, receptacles (such as power strips), and the point where
they exit from the CM601 and attach to other equipment. Do not place any items on or
against power cords.
Protect Against Lightning and Power Surges
When the CM601 equipment is installed, have the professional installer ground the system
to protect against voltage surges and built-up static charges. It is recommended to install
system primary and secondary lightning/surge protective devices for CM601 units having
direct connection to external radio equipment. For information on grounding standards for
electrical and radio equipment, refer to the electrical code in the country of installation.
For example, in North America refer to the National Electrical Code (NEC) Article 250
for grounding, and Article 810 for radio equipment.
Protect the CM601 from lightning and power-line surges during a storm by unplugging it
from the wall outlet and disconnecting the coaxial cable.
Country Agency
Australia SAA
Austria OVE
Belgium CEBEC
Canada CSA
Denmark DEMKO
Finland FEI
France UTE
Germany VDE
India ISI
Ireland IIRS
Italy IMQ
Japan MITI
Netherlands KEMA
New Zealand SECV
SECQ
SECWA
EANSW
ETSA
HECT
Norway NEMKO
Rep. S. Africa SABS
Spain AEE
Sweden SEMKO
Switzerland SEV
United Kingdom (UK) ASTA
BSI

xx Preface
Turn the CM601 Off When Changing Option Boards
Turn the CM601 off before installing or removing option boards from chassis slots that do
not have the Hot Plug/Pull symbol on their filler plate. Possible damage may occur to
modem, boards, or related equipment if power is left on during this procedure.
Provide Antistatic Protection
Wear a properly grounded antistatic wrist strap to prevent electrostatic damage to
components when handling circuit boards or other electronic modules.
Keep Objects Outside
Touching internal CM601 parts is dangerous to both you and the unit. Never put any
object, including your fingers, through CM601 slots or openings, as this could result in
touching dangerous voltage points, short-circuiting parts, electric shock, or fire.
There are no user-serviceable parts inside the CM601. If an object falls into the CM601,
unplug the unit and contact ComStream Customer Service, as serious damage could occur
to the CM601 or its components.
Use Approved Attachments Only
Use only ComStream-approved option cards and other satellite communication equipment
with the CM601.
Clean the CM601
Before cleaning the CM601, unplug it from the wall outlet. Do not use any type of
abrasive pads, scouring powders, aerosol cleaners, or solvents such as alcohol or benzene.
Use only a clean, soft cloth lightly moistened with a mild detergent solution. Wipe all
equipment with a clean, soft cloth lightly moistened with water to remove the detergent
solution.
Service the CM601
Do not attempt to service the CM601 yourself, as there are no user-serviceable parts.
Opening or removing covers may expose you to dangerous voltages or other hazards as
well as void your warranty. Contact ComStream Customer Service to obtain qualified
service personnel.
The following conditions indicate that the CM601 needs servicing:

The power cord or plug has been damaged.

An object has fallen into the CM601.

Liquid has been spilled into the CM601, or it has been exposed to rain or water.

The unit has been dropped, or the cover has been damaged.

The CM601 does not operate normally, or it shows a marked change in performance.
Perform Safety Checks
Upon completion of any service or repairs to the CM601, the service technician will
perform safety checks to verify that the system is in safe operating condition.