Coresma NeMo CMTS User manual

NeMo CMTS
User’s Guide

010804

NeMo CMTS User’s Guide
-i-
Important Notice
This guide is delivered subject to the following conditions and restrictions:
§This guide contains proprietary information belonging to Coresma, Ltd. Such
information is supplied solely for the purposeof explicitly assisting properly
authorized users of NeMo CMTS System™.
§No part of the contents may be used for any other purpose, disclosed to any
person or firm or reproduced by any means, electronic and mechanical, without
the express prior written permission of Coresma, Ltd.
§The text and graphics are for the purpose of illustration and reference only. The
specifications on which they are based are subject to change without notice.
§The software described in this document is furnished under a license. The
software may be used or copied only in accordance with the terms of that
agreement.
§Information in this document is subject to change without notice. Corporate and
individual names and data used in examples herein are fictitious unless
otherwise noted.
Copyright 2001 Coresma, Ltd.
NeMo CMTS, NeMo Modem are trademarksof Coresma Ltd. All other product names
are trademarks or registered trademarks of their respective owners, and are hereby
acknowledged.

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Safety Instructions
Caution! Risk of Electric Shock!
Do not open the cover under any circumstances.
§Dangerous voltages inside.
§No user serviceable parts inside.
§Refer to qualified service personnel.
Explanation of Graphical Symbols:
This symbol is intended to alert the user to the presence of non-insulated
"dangerous voltage" within the product's enclosure that may be of sufficient magnitude
to constitute a risk of lethal electric shock to persons.
This symbol is intended to alert the user to the presence of important operating,
maintaining and servicing instructions in the literature accompanying the appliance.
Failing to comply with this instruction may result in a hazard.

NeMo CMTS User’s Guide
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§Power sources-Connect this unit only to power sources specified in the
Operating Instructions, and as marked on the unit back.
§This unit must be disconnected from power supply prior to servicing.
§When disconnecting the AC power cord, pull it out by the AC power plug. Do
not pull the cord itself.
§Never handle the AC power plug or cable with wet hands, as this could result in
fire or an electrical shock.
§Power cords should be routed to avoid being severely bent, pinched, or walked
upon. Pay particular attention to the cord from the unit to the power socket.
§To help prevent electric shock and fire hazard avoid connecting the unit through
an extension cord.
§Do not remove or attach cables to the unit during a thunderstorm.
§The CMTS must be installed near a wall power outlet.
§Only a certified technician is allowed to connect and disconnect cables to the
CMTS.
§Please install the CMTS on a stable horizontal surface that can support the
weight of the CMTS, approximately 4.0 kg.
§Do not place heavy objects on top of the box.
§Do not try to bend the box.
Environmental Conditions for the NeMo CMTS
§This unit must be installed in an office environment in a temperature-controlled
location where the temperature is between 0°and 40°Celsius, far away from
rain, water sources, heat sources, inflammable liquids, inflammable vapors, dust
and flammable materials.
§If installed in a rack, air ventilation should be provided for the CMTS. The
surrounding temperature inside the rack around the CMTS should not be over
40º Celsius.
§Do not impair the airflow around the CMTS especially near the air vents located
at the sides of the unit as shown in the figure below. This may result in a hazard.

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§The CMTS was designed to work at heights between–200 meters below sea level
and to 2000 meters above sea level.
§If the CMTS is brought in from a cold place to a hotter place, condensation may
occur. Wait one hour before connecting to power.

NeMo CMTS User’s Guide
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About This Guide
This guide describes how to prepare your site and install the NeMo CMTS system. It is
intended for qualified engineers familiar with RF networks.
This guide contains the following chapters:
§Chapter 1–Introduction introduces the NeMo CMTS system, describes its
components and provides technical specifications.
§Chapter 2-Site Preparation describes the hardware, software, and
environmental requirements necessary for the installation at the headend and
end-user sites.
§Chapter 3-Installing the NeMo CMTS describes the procedure for installing the
NeMo CMTS system and testing an end-user site from your location.
§Appendix A –Rlogin Commands describes the various system commands used to
control the CMTS
§Appendix B–NetHotel lists additional system commands for controlling the
optional NetHotel software
§Appendix C –Boot Parameters lists the parameters available during the boot
sequence of the CMTS.
§Appendix D –Multiple MAC Modems describes using multiple NeMo modems
in a network.
§Appendix E –Glossary of Terms defines technical terms used in this document.
§Appendix F –Technical Specifications lists the specifications of the NeMo CMTS
§Contacting Coresma lists the various ways to contact Coresma Sales and
Support.

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Table of Contents
IMPORTANT NOTICE.......................................................................................................................................................I
SAFETY INSTRUCTIONS..............................................................................................................................................II
Explanation of Graphical Symbols:.....................................................................................................................ii
Environmental Conditions for the NeMo CMTS............................................................................................iii
ABOUT THIS GUIDE........................................................................................................................................................V
TABLE OF CONTENTS....................................................................................................................................................VI
INTRODUCTION................................................................................................................................................................1
About this chapter:.................................................................................................................................................1
WHATISTHE NEMO CMTS SYSTEM?...................................................................................................................1
System Components...............................................................................................................................................1
NEMO CMTS DIAGRAM..........................................................................................................................................4
OVERVIEW....................................................................................................................................................................5
HOWTHE CMTS WORKS.........................................................................................................................................6
NEMO HEADEND UNIT............................................................................................................................................7
Configuring the CMTS.........................................................................................................................................8
MAIN FEATURES.........................................................................................................................................................8
ARCHITECTURE...........................................................................................................................................................8
OPERATION AND MAINTENANCE...........................................................................................................................8
INSTALLATION FEATURES.........................................................................................................................................9
INTRODUCINGTHE NEMO CABLE MODEM..........................................................................................................9
SYSTEM ARCHITECTURE..........................................................................................................................................10
SYSTEM CONNECTIVITY...........................................................................................................................................11
HEADEND HARDWARE...........................................................................................................................................13
CMTS Functionality ...........................................................................................................................................13
RF Transmitter.....................................................................................................................................................13
RF Burst Receiver ................................................................................................................................................14
NeMo Modem Transmitter ................................................................................................................................14
Channel Controller...............................................................................................................................................14
IP Host Address....................................................................................................................................................14

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HEADEND SOFTWARE.............................................................................................................................................14
CMTS Embedded Code.......................................................................................................................................15
NEMO CABLE MODEM...........................................................................................................................................15
CM Controller......................................................................................................................................................16
Burst Transmitter................................................................................................................................................16
Downstream IF Receiver ....................................................................................................................................16
Tuner and Diplexer .............................................................................................................................................16
Multiple MAC Modems .....................................................................................................................................16
APPLICATIONS..........................................................................................................................................................16
SYSTEM WITHOUT MANAGEMENT.......................................................................................................................17
SYSTEM WITH MANAGEMENT...............................................................................................................................17
SITE PREPARATION......................................................................................................................................................18
About this chapter:...............................................................................................................................................18
OVERVIEW..................................................................................................................................................................18
System Components ............................................................................................................................................18
BASIC CONFIGURATION..........................................................................................................................................19
PREPARINGTHE HEADEND SITE...........................................................................................................................21
Preparing the Management Computer............................................................................................................21
Preparing the RF Network .................................................................................................................................23
Preparing the Ethernet Network Parameters..................................................................................................25
PREPARING A LOCAL END-USER SITE.................................................................................................................26
Installation Configuration..................................................................................................................................27
INSTALLINGTHE NEMO CMTS................................................................................................................................29
About this Chapter...............................................................................................................................................29
PART1: SETTING UP THE CMTS AND MODULATOR CONNECTION.............................................................29
Connecting the CMTS and Modulator............................................................................................................29
Calibrating the RF Signals and Connecting to the RF Network.................................................................31
PART2. SETTING UP THE MANAGEMENT COMPUTER(S)................................................................................35
Configuring the CMTS for the First Time: CMTS Configuration.............................................................36
Configuring the CMTSUsing FOCS..............................................................................................................40
PART3: SETTING UP AN END-USERSITE............................................................................................................41
Before You Begin..................................................................................................................................................41
Installing the NeMo Modem..............................................................................................................................41
Installing and Using the NeMo Tool ...............................................................................................................42
RLOGIN C OMMANDS ....................................................................................................................................................45

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INTRODUCTION.........................................................................................................................................................45
REQUIREMENTS.........................................................................................................................................................45
AUTHORIZATION......................................................................................................................................................45
RLOGIN PASSWORD..................................................................................................................................................46
SHELL COMMANDS..................................................................................................................................................46
dir............................................................................................................................................................................46
cd .............................................................................................................................................................................46
show........................................................................................................................................................................46
set ............................................................................................................................................................................46
help..........................................................................................................................................................................46
quit..........................................................................................................................................................................47
reboot......................................................................................................................................................................47
write........................................................................................................................................................................47
ls..............................................................................................................................................................................47
CONTROL VARIABLES..............................................................................................................................................47
Root directory........................................................................................................................................................47
Service directory ...................................................................................................................................................48
Upchan directory..................................................................................................................................................49
Freq_hopp_table directory...................................................................................................................................51
Downchan directory ............................................................................................................................................51
CMTS directory....................................................................................................................................................52
mgmt directory .....................................................................................................................................................54
Stats directory .......................................................................................................................................................55
ip_cfg directory.....................................................................................................................................................57
Boot_cfg directory ................................................................................................................................................58
Radius Directory ..................................................................................................................................................58
CM Operation Mode directory ..........................................................................................................................62
NETHOTEL .....................................................................................................................................................................65
NAT/SETTINGS DIRECTORY...................................................................................................................................65
BOOTPARAMETERS.....................................................................................................................................................69
MULTIPLE MAC MODEMS.........................................................................................................................................71
PREFACE.....................................................................................................................................................................71
MULTIPLE MAC DETAILED DESCRIPTION..........................................................................................................71
MODEM IDENTIFICATION.......................................................................................................................................71
Modem Ethernet Operation Mode....................................................................................................................71
MAC ADDRESS TRANSLATION.............................................................................................................................72